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Tytuł:
Kompozytowe mosty wojskowe
The application of composites (FRP) in military bridges
Autorzy:
Szelka, J.
Kamyk, Z.
Powiązania:
https://bibliotekanauki.pl/articles/390232.pdf
Data publikacji:
2013
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
kompozyty
mosty wojskowe
most szturmowy
modułowy most kompozytowy
composite
deployable bridge
assault bridge
modular composite bridge
Opis:
Potrzeby wojsk ekspedycyjnych wymagają stosowania lekkich mostów o ograniczonych gabarytach, tak aby mogły być transportowane drogą powietrzną. USA prowadzi program budowy kompozytowego mostu czołgowego (Composite Army Bridge - CAB) i mostu wsparcia - Modular Composite Bridge – MCB. W roku 2004 CAB przeszedł pomyślnie testy zmęczeniowe. Całkowicie kompozytowe przęsło koleinowe o długości 14 m było obciążane pojazdem klasy MLC 100 (Military Load Class) i wytrzymało 20 tys. cykli obciążenia. MCB będzie zbudowany z 7 m modułów skrzynkowych i 6,5 m ramp wjazdowych. Przęsło o długości 26 m i szerokości 4 m, ma zapewnić przejazd obciążeń klasy MLC 65. Także w Kanadzie prowadzone są prace nad mostem kompozytowym, który ma 10 m długości i nośność MLC 30. Artykuł przedstawia także amerykańską koncepcję zastosowania mobilnego mostu wykonanego na zasadzie konstrukcji zespolonej. Jako deskowanie i zbrojenie płyty wykorzystano prasowane kompozyty poliestrowe FRP. Konstrukcja dźwigarów nośnych wykonana jest z a rur aluminiowych w postaci kratownicy rombowej o zakrzywionym pasie dolnym. Po wbudowaniu węzły pasa górnego są zespolone płytą pomostową wylewaną na miejscu.
The needs of expeditionary forces involve the use of light-weight, short-span bridges so that their transport by air would be possible. A project which is currently developed in USA aims at the elaboration of a Composite Army Bridge (CAB) assault bridge and a Modular Composite Bridge – MCB logistic bridge. In 2004 CAB successfully underwent fatigue tests. A 14 m-long, all-composite treadway bridge span was loaded by using an MLC 100 vehicle and it withstood 20 000 load cycles. The MCB will be constructed by7 m of box modules and a 6.5 m access ramp. A 26 m-long and 4 m-wide bridge span is to provide the traffic ability of MLC 65. Furthermore, works on a 10 m-long, MLC 30 composite bridge are also developed in Canada too. The paper also presents the American concept of employing a deployable bridge system by utilising a composite structure. In order to formwork and reinforce the plate, fibre reinforced polyester composites (FRP) were used. The girder construction is made of aluminium pipes forming diamond truss with curved bottom chord. After they are integrated in the structure, the top chord nodes are connected through deck plate cast in-situ. The tests indicated that there exists the possibility of using polymer composites in military bridge construction and mobile structures of composite bridges.
Źródło:
Budownictwo i Architektura; 2013, 12, 2; 63-70
1899-0665
Pojawia się w:
Budownictwo i Architektura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Span length influence on dynamic response of selected bridge under high - speed train
Autorzy:
Szurgott, P.
Bernacki, P.
Powiązania:
https://bibliotekanauki.pl/articles/247827.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
railway bridge
composite bridge
ballasted track
high-speed train
modelling and simulation
Opis:
The paper presents a methodology of finite element (FE) modelling and simulation of the bridge – track – moving high-speed train system using CAE systems. Two composite (reinforce-concrete – steel) bridges were considered. The span length was equal to 15 and 21 meters, respectively. Bridges selected for the study belong to the proposed series of bridges with the span length of 15 to 27 meters stepped by 3 meters. Full symmetry of the bridges was assumed. RC platform was homogenized since the rebars were distributed quasi-uniformly in the specified platform sections. The FE model of a bridge superstructure consisted of 4-node shell elements (main beams) and 8-node 48 DOF solid elements (reinforced concrete platform). RAIL_TRACK and RAIL_TRAIN LS-DYNA’s modules were applied for simulating the moving train – track interaction. Ballasted track with the rectilinear rail-line axis was taken into consideration. German ICE-3 train running at velocity of 200–300 km/h was selected as a representative for the study. All mass components of the train FE model were treated as rigid bodies. Symmetric vibrations of the train units were assumed with respect to the main longitudinal vertical plane of symmetry of the system. Nodal displacement and longitudinal normal stress in shell elements were registered during the FE analysis. The results were depicted in the form of time histories for selected velocities. In addition, extreme values of vertical deflections and normal stress were compiled and presented a function of train velocity. It allowed to assess the dynamic response of the bridge depending on its span length. Contours of resultant displacement for the RC platform was also presented.
Źródło:
Journal of KONES; 2013, 20, 1; 343-350
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modernization of the KNI 140070 viaduct and its influence on dynamic response under selected high speed train
Autorzy:
Szurgott, P.
Kozera, D.
Powiązania:
https://bibliotekanauki.pl/articles/242996.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
bridge - train interaction
composite bridge
ballasted track
ICE train
modelling and simulation
Opis:
The paper develops a methodology of FE modelling and simulation of the bridge - track - moving train (BTT) system using LS-DYNA computer code. The KNI 140070 viaduct of span length 14.40 m with ballasted track was selected as a representative for the study. Two variants of the viaduct were taken into consideration - a version operated before the modernization in 2008 and the modernized version including additional flats welded to the bottom flanges of the main beams. The German high-speed train ICE-3 moving at 150–300 km/h was selected. The FE model of the BTT system was developed using Altair HyperMesh and LS-PrePost software. The platform of the viaduct was modelled using 8-node 48 DOF solid elements. The structure was symmetrised, homogenized and reflected by linear viscoelastic orthotropic materials. Discrete model of the track included the main and side rails, fastening systems, sleepers, crushed stone ballast and approach RC slabs. Components of the train FE model were considered as rigid bodies. Cylindrical and revolute constrained joints were applied for kinematic connections and relations between respective components. Discrete springs and dampers were applied for FE modelling of the primary and the secondary suspension systems. Numerical simulations were focused on determining the resonant velocities for both considered variants. Selected time histories for displacements and stresses, were shown as the results of the analyses.
Źródło:
Journal of KONES; 2012, 19, 4; 615-624
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling and numerical simulation of symmetric vibrations of the KNI 140070 viaduct -ballasted track - KTX train system
Autorzy:
Szurgott, P.
Klasztorny, M.
Niezgoda, T.
Powiązania:
https://bibliotekanauki.pl/articles/247456.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
railway bridge
composite bridge
ballasted track
KTX train
modelling and simulation
Opis:
The paper develops a new methodology of FE modelling and simulation of the bridge - track - moving train system with the use of CAE systems. The KNI 140070 viaduct of span length 14.40 m, located on the Polish Central Main Line, has been selected. The modernized track contains: 60E1 main rails equipped with Vossloh 300-1 fasteners, 60E1 side rails with SB3 fasteners, B 320 U60 sleepers, crushed stone ballast, approach RC slabs. A KTX (Korea Train eXpress) high-speed train, being a modification of a TGV train, is taken into consideration. A methodology of physical and numerical modelling of the viaduct, the track and the train was developed using Altair HyperMesh and LS-PrePost software. The FE model of a bridge superstructure consists of 4-node shell elements (main beams) and 8-node 48 DOF solid elements (reinforced concrete platform). RAIL TRACK and RAIL TRAIN modules available in LS-Dyna system were applied for simulating the train — trach interaction. Hughes-Liu beam elements were used for the rail modelling. Rail fastenings were simulated using one-dimensional discrete spring and damper elements. Carbodies, bogieframes and wheelsets were considered as rigid bodies and they were modelled using shell and beam elements. Cylindrical and revolute constrained joints and discrete springs and dampers were applied to connect all components of the FE model of rail-vehicles. The exemplary simulation of transient vibrations of the bridge - trach -train system has been made for service velocity 300 km/h. Contours of displacement and stress and selected time histories for displacements, accelerations and stresses, created in LS-PrePost and HyperView software, have been analysed.
Źródło:
Journal of KONES; 2010, 17, 3; 415-422
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The evolution of the shape of composite dowels
Autorzy:
Lorenc, Wojciech
Seidl, Günter
Berthellemy, Jacques
Powiązania:
https://bibliotekanauki.pl/articles/2172885.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
composite dowel
shear connection
composite bridge
fatigue
FEM
finite element method
hybrid beam
Opis:
Composite dowels have opened new possibilities for engineers designing composite structures. The fundamental and most important characteristic of composite dowels is the shape of the cutting line. It is important to understand why only one particular shape of the cutting line is used in bridge engineering, while so many different shapes have been investigated by many researchers. The essential part of the process of developing composite dowels – the development of the shape of the cutting line – is presented in this paper. The influence of the steel web thickness is presented, and technological problems of steel fabrication are highlighted. The role of empirical experience from the first bridges, push-out tests, and finite element simulations is presented. Assumptions for numerical procedures are given. The distinction between the steel failure and concrete failure modes is introduced for composite dowels. The paper presents how the concept of “shape” was divided into “shape,” “ratio,” and finally “size,” and how, because of the fatigue problems in bridges, all the three factors have emerged to result in the form of shapes that can satisfy the requirements for bridges. Research leading to the invention of the first version of the clothoidal shape is presented.
Źródło:
Studia Geotechnica et Mechanica; 2022, 44, 4; 296--316
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural design of flexible culverts development trends
Autorzy:
Pettersson, L.
Wadi, A.
Williams, K.
Powiązania:
https://bibliotekanauki.pl/articles/383669.pdf
Data publikacji:
2017
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
flexible culvert
Soil-Steel Composite Bridge
Canadian Highway Bridge Design Code
TRVK Bro 11
Swedish Design Method
Opis:
Structural design requirements for flexible culverts are available in several international bridge design codes. Examples are the Canadian (CHBDC), the American (AASHTO) and the Swedish (TRVK Bro ll2). The designation “flexible culvert” may today be somewhat misleading. The word culvert is usually associated with small pipes in road embankments. However, over the years flexible culverts have grown bigger and a more proper designation would be bridges. Therefore, these structures are often also referred to as Soil-Steel Composite Bridges or just Soil-Steel Bridges. With this development also new and more stringent requirements on the structural design follows. In this paper key aspects of a holistic design approach based on the authors experience on the essentials of flexible culvert structural design3 are outlined and is compared to the current design approaches in the CHBDC and the TRVK Bro 11. However, this paper will provide insight into how the holistic design topics are addressed in current design codes and future research and development.
Źródło:
Archiwum Instytutu Inżynierii Lądowej; 2017, 23; 237-250
1897-4007
Pojawia się w:
Archiwum Instytutu Inżynierii Lądowej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Koncepcja budowy mostu przez rzekę Bystrzycę w Lublinie - kompendium analiz wykonanych w ramach pracy dyplomowej
Concept for the construction of a bridge over the river Bystrzyca in Lublin - a compendium of analyses performed as part of the thesis
Autorzy:
Marciniuk, Mateusz
Śledziewski, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/24024773.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Komunikacji Rzeczpospolitej Polskiej
Tematy:
ulica Azaliowa
most zespolony
most łukowy
analiza statyczna
Midas Civil
Azaliowa Street
composite bridge
arch bridge
static analysis
Opis:
W stale rozwijających się miastach konieczne staje się poszukiwanie nowych ciągów komunikacyjnych, mających na celu zaspokojenie potrzeb mieszkańców miasta. Na przykładzie mostu na rzece Bystrzycy w Lublinie przeanalizowano historię wcześniejszych obiektów, a także możliwości budowy nowego obiektu mostowego. Do analizy przyjęto założenia i wykorzystano program Midas Civil 2020. Pozwoliło to na opracowanie koncepcji budowy mostu. Po czym rozważaniu poddano walory estetyczne obiektu, gdyż ma to bezpośredni wpływ na postrzeganie mostu i jego otoczenia. Wnioski przedstawiają zarówno wady, jak i zalety przyjętych rozwiązań.
In constantly developing cities, it is becoming necessary to look for new transportation routes to meet the needs of city residents. Using the example of the bridge over the river Bystrzyca in Lublin, the history of previous structures was analyzed, as well as the possibility of building a new bridge structure. For the analysis, assumptions were made and the Midas Civil 2020 program was used. This allowed the development of a concept for the construction of the bridge. Afterwards, the aesthetic qualities of the structure were considered, as they have a direct impact on the perception of the bridge and its surroundings. The conclusions present both advantages and disadvantages of the adopted solutions.
Źródło:
Drogownictwo; 2022, 11-12; 397--404
0012-6357
Pojawia się w:
Drogownictwo
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recent research on flexible culverts in sloping terrain
Autorzy:
Wadi, A.
Pettersson, L.
Powiązania:
https://bibliotekanauki.pl/articles/383757.pdf
Data publikacji:
2017
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
sloping terrain
flexible culvert
soil-steel composite bridge
finite element method
snowshed
avalanche load
Opis:
The performance of buried flexible steel structures is directly influenced by the quality of the backfill soil and its configuration around the conduit. The economical choice of these structures stimulates practitioners to expand their different applications including their performance in sloping environment. The presence of steep surface slopes induces unbalanced loading and asymmetrical soil support around the conduit. This paper outlines the latest research efforts on how a flexible culvert would perform in sloping terrain environment. The paper focuses primarily on the structural behaviour of soil loading effects. The investigation highlights the use of numerical simulation in predicting the performance of a case study of flexible culvert under different construction schemes, where the influence of slope intensity and depth of soil cover are briefly presented. Soil slope stability as a major concern is also discussed. The research outcome clearly underlines the importance of soil configuration around steel culverts. The asymmetrical response of the conduit is predictably observed from the results and greatly influenced by the presence of shallow depth of soil covers. Sectional forces tend to increase with the increase of surface slopes. The results also underline the necessity of soil stability investigation when constructing flexible culverts in sloping terrain.
Źródło:
Archiwum Instytutu Inżynierii Lądowej; 2017, 23; 293-299
1897-4007
Pojawia się w:
Archiwum Instytutu Inżynierii Lądowej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Large-span soil steel composite bridges
Autorzy:
Wadi, A.
Pettersson, L.
Powiązania:
https://bibliotekanauki.pl/articles/384031.pdf
Data publikacji:
2017
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
flexible culvert
soil-steel composite bridge
Swedish design method
long-span
ultimate field test
full-scale test
loading to failure
Opis:
Soil-steel composite bridges are considered competitive structures being an economical alternative to similar span concrete bridges. They are increasingly used for road and railway bridge construction. Spans have increased and structures with spans over 20 m have been built. The continuous development of infrastructure impels designers to push the limits of these structures for bigger spans with the lowest possible height of cover. Since the birth of the ring compression theory, different design methods have been developed to account for the various conditions and facilitate the use of bigger span structures. Yet, there is an urge to investigate whether the current design procedures are conservative or if they are reasonably accurate to predict the capacity of large-span structures. This paper presents the on-going project involving the capacity of large-span soil-steel composite bridges. The study investigates the use of finite element modelling in predicting the performance of a case study for an ultimate limit state field test. The project also highlights the need and intention to perform an ultimate limit state test for a large-span structure. The outcome of the project is to assess the current design procedures and to reflect recommendations on the design where seen applicable.
Źródło:
Archiwum Instytutu Inżynierii Lądowej; 2017, 23; 287-292
1897-4007
Pojawia się w:
Archiwum Instytutu Inżynierii Lądowej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Steel soil composite bridge: an alternative design solution for short-span bridge towards sustainability
Autorzy:
Du, G.
Petersson, L.
Karoumi, R.
Powiązania:
https://bibliotekanauki.pl/articles/383565.pdf
Data publikacji:
2017
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
concrete slab frame bridge
soil steel composite bridge
soil steel flexible culverts
LCA
C02 emission
sustainable construction
life cycle assessment (LCA)
global warming
climate change
Opis:
The construction sector is a major source of greenhouse gases. Under the increasing concern about climate change and growing construction activities, the whole sector is challenged to shift focus toward sustainable solutions. The traditional procurement often prioritizes technical and economic viability, while their environmental performance is overlooked. Today’s designers are urged to seek new design options to reduce environmental burdens. Sweden owns more than 24574 bridges, most of which are short spans. Among them, the slab frame bridge (CFB) is a common solution. Soil steel composite bridge (SSCB), alternatively, is a functional equivalent solution to CFB and shows advantages in low cost and easy construction. This paper compares the environmental performance between these two bridge types based on life cycle assessment (LCA). The analysis and its results show that the SSCB is preferable over CFB in most of the examined environmental indicators.
Źródło:
Archiwum Instytutu Inżynierii Lądowej; 2017, 23; 91-101
1897-4007
Pojawia się w:
Archiwum Instytutu Inżynierii Lądowej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vertical vibrations of composite bridge/track structure/high-speed train systems. Part 3: Deterministic and random vibrations of exemplary system
Autorzy:
Podworna, M.
Klasztorny, M.
Powiązania:
https://bibliotekanauki.pl/articles/201818.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
composite steel-concrete bridge
ballasted track structure
high-speed train
design
simulation
numerical analysis
Opis:
Based on the one-dimensional quasi-exact physical and mathematical modelling of a composite (steel-concrete) bridge/track structure/high-speed train system (BTT), developed in Part 2, advanced computer algorithms for the BTT numerical modelling and simulation as well as a computer programme to simulate vertical vibrations of BTT systems are developed. The exemplary bridge under numerical quasi-static and dynamic analysis, designed according to Polish standards, has a 15.00 m span length and belongs to the SCB series-of-types developed in Part 1. The bridge is loaded by a German ICE-3 high-speed train moving at the resonant and maximum operating speeds. A continuously welded ballasted track structure adapted to high operating velocities is applied. The output quantities include: time-histories of the vertical deflection of the main beams at the midspan, time-histories of the longitudinal normal stress in the bottom fibres of the main beams at the midspan, time-histories of the vertical acceleration of the bridge deck at the midspan, time-histories of the vertical accelerations of the suspension pivots in car-bodies, time-histories of the dynamic pressures of the wheel sets of moving rail-vehicles. The design quantities, understood as the extreme values of the output quantities, are used to verify the design conditions. The basic random factor, i.e. vertical track irregularities of the track, is taken into consideration. Basic statistics of the design quantities treated as random variables are calculated and taken into account in the design conditions.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 2; 305-320
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vertical vibrations of composite bridge/track structure/high-speed train systems. Part 2: Physical and mathematical modelling
Autorzy:
Podworna, M.
Klasztorny, M.
Powiązania:
https://bibliotekanauki.pl/articles/200194.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
composite steel-concrete bridge
ballasted track structure
high-speed train
random track irregularities
FE modelling
equations of motion
Opis:
A theory of one-dimensional physical and mathematical modelling of the composite (steel-concrete) bridge/track structure/highspeed train system is developed including viscoelastic suspensions of rail-vehicles with two two-axle bogies each, non-linear Hertz contact stiffness and one-sided contact between wheel sets and rails, the viscoelastic and inertia features of the bridge, the viscoelastic track structure on and beyond the bridge, approach slabs, and random vertical track irregularities. Compared to the state-of-the-art, the physical model developed in the study accurately reproduces dynamic processes in the considered system. Division of the system into the natural subsystems, a method of formulation of the equations of motion partly in implicit form and the finite element method are applied. Vibrations in the vertical plane of symmetry are described by more than nine matrix equations of motion with constant coefficients. Couplings and non-linearity are hidden in the generalized load vectors. The equations of motion are integrated using the implicit Newmark average acceleration method with linear extrapolation of the interactions between the subsystems.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 1; 181-196
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vertical vibrations of composite bridge/track structure/high-speed train systems. Part 1: Series-of-types of steel-concrete bridges
Autorzy:
Podworna, M.
Klasztorny, M.
Powiązania:
https://bibliotekanauki.pl/articles/202151.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
composite steel-concrete bridge
ballasted track structure
high-speed train
design
FE modelling
simulation
forced resonances
numerical analysis
Opis:
A new series-of-types of single-span simply-supported railway composite (steel-concrete) bridges, with a symmetric platform, has been designed according to the Polish bridge standards. The designed bridges/viaducts are located on the main railways of the classification coefficient k = +2. A ballasted track structure adapted to high operating speeds has also been designed. The ultimate limit states and the limit states corresponding to the bridges undertaken are collected and discussed. The bridges have been designed in accordance with contemporary art engineering, with geometric and material optimization, avoiding overdesign. A new methodology of numerical modelling and simulation of dynamic processes in composite bridge/ballasted track structure/high speed train systems, developed in Part 2 and Part 3, has been applied and implemented in a problem-oriented computer programme. A new approach to predicting forced resonances in those systems is formulated and tested numerically. It has been proved that in the case of typical structural solutions of bridges and ballasted track structures, it is necessary to introduce certain limitations for operating speeds of trains.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 1; 165-179
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ losowych nierówności toru na drgania wybranego układu most zespolony / nawierzchnia kolejowa / pociąg szybkobieżny
Effect of random track irregularities on selected composite bridge / track structure / high-speed train system vibrations
Autorzy:
Podwórna, M.
Klasztorny, M.
Powiązania:
https://bibliotekanauki.pl/articles/389886.pdf
Data publikacji:
2013
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
most zespolony
nawierzchnia kolejowa podsypkowa
pociąg szybkobieżny ICE-3
losowe nierówności toru
modelowanie
symulacja
badania numeryczne
steel concrete composite bridge
ballasted track structure
ICE-3 high–speed train
random track irregularities
modelling
simulation
numerical analysis
Opis:
Opracowano quasi-ścisłą teorię modelowania jednowymiarowego (1D), fizycznego i matematycznego, układu most zespolony / nawierzchnia kolejowa podsypkowa / pociąg szybkobieżny (BTT), przy uwzględnieniu lepkosprężystych zawieszeń pojazdów szynowych na dwuosiowych wózkach jezdnych, nieliniowej sztywności kontaktowej Hertza i jednostronnego kontaktu między zestawami kołowymi a szynami, cech lepkosprężystych i bezwładnościowych mostu, lepko sprężystej nawierzchni kolejowej na moście i poza mostem, płyt przejściowych i losowych nierówności toru. Na podstawie tej teorii opracowano zaawansowane algorytmy komputerowe modelowania numerycznego układów BTT oraz program komputerowy do symulacji drgań pionowych tych układów. W ramach wstępnych badań dynamicznych rozważono most zaprojektowany zgodnie z polskimi normami, o rozpiętości teoretycznej przęsła 15,00 m, oznaczony kodem SCB-15. Most obciążono niemieckim pociągiem szybkobieżnym ICE-3, poruszającym się z prędkością krytyczną (270 km/h) i maksymalną (300 km/h).
A theory of the quasi-exact physical and mathematical modelling of the composite (steel–concrete) bridge / ballasted track structure / high-speed train system (BTT) was developed, including viscoelastic suspensions of rail-vehicles on two-axle bogies, the non-linear Hertz contact stiffness and one-sided contact between the wheel sets and the rails, the viscoelastic and inertia features of the bridge, the viscoelastic track structure on and beyond the bridge, the approach slabs, and random track irregularities. Based on this theory, advanced computer algorithms for the BTT numerical modelling were written and a computer program to simulate the vertical vibrations of the BTT systems was developed. The bridge subject to the preliminary dynamic analysis and designed according to Polish standards has a 15.00 m span length. The bridge was loaded by the German ICE-3 high-speed train moving at the critical (180 and 270 km/h) and the maximum (300 km/h) operating speeds.
Źródło:
Budownictwo i Architektura; 2013, 12, 1; 259-266
1899-0665
Pojawia się w:
Budownictwo i Architektura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Koncepcja konstrukcji nośnej lekkiego kompozytowego mostu pływającego do transportu kołowego
Concept of construction of lightweight composite floating bridge for road transport
Autorzy:
Błażejewski, W.
Gąsior, P.
Kaleta, J.
Krzyżak, A.
Rybczyński, R.
Powiązania:
https://bibliotekanauki.pl/articles/312531.pdf
Data publikacji:
2010
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
most pływający
kompozyty
floating bridge
composite
Opis:
W pracy zaproponowano koncepcję budowy oraz technologię wykonania lekkiego kompozytowego pontonu przeznaczonego do budowy mostów pływających z przeznaczeniem do transportu kołowego. Propozycja wykorzystuje ideę powiększonego tzw. plastra miodu, w którym pojedyncza komórka jest graniastosłupem o przekroju sześciokąta foremnego o wymiarze 100 mm. W pierwszym etapie wykonano i przebadano pojedyncze komórki, których rdzeniem był polistyren spieniony zamknięty w kompozycie epoksydowo - szklanym. Drugi etap prac technologicznych i badawczych polegał na wykonaniu bloku złożonego z 25 wspomnianych komórek o kształcie graniastosłupa o przekroju sześciokąta foremnego o wymiarze 600 mm. Wyniki przeprowadzonych wstępnych prac technologicznych i badawczych pozwalają stwierdzić, iż przyjęty kierunek jest dobry. Uzyskana gęstość pontonu wynosi 118 kg/m³. Blok pontonowy wykazuje zadowalające właściwości wytrzymałościowe.
The paper proposes the concept of construction and technology of manufacturing of lightweight composite pontoon intended to build a sail bridges for road transport. The proposal uses the idea of enlarged honeycomb, in which a single cell is a hexagonal prism dimension 0.01 m and height of 0.5 m. In the first stage of work performed and tested a single cell, in which core made from polystyrene foam was enclosed in a composite epoxy - glass. The second stage of technological and research works was manufacturing of block consisting a complex of 25 shaped prism with hexagonal cross section and dimension 600 mm. The results of preliminary technological works and researches allow to conclude that the adopted course of the work is correct. Pontoon block exhibits satisfactory strength properties.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2010, 11, 6
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 31

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