Distribution of internal forces in bar structures in relation to rotational flexibility of their nodes is widely
discussed in the literature. However, the investigations concerning such structures with nodes flexible in
terms of shift are less frequent. This paper presents examples of structures, in which the shift flexibility of lap
joints determined their load-bearing capacity and stability, as well as the serviceability limit states. A low-rise
dome, a covering of the exhibition hall in Chorzów, which collapsed in 2006, and a mobile telephony tower
were depicted. Mechanical models describing rotational stiffness and shift flexibility of various lap joints by
means of component method were used. Mathematical model by Kishi and Chen was applied to model the
susceptibility of lap joints under alternating loads. In case of the low-rise dome, the results indicated that the
failure was determined by joint clearances. In case of covering of the exhibition hall in Chorzów, flexibility
of joints resulted in excessive utilization of resistance in certain lattice purlins, which could have initiated the
disaster. In turn, flexibility of connections rarely considered in the design of mobile phone towers may result
in an excessive sway of the tower legs on which the antennas of the radio link are suspended and thus interfere
transmitted signals. The study showed that there is a need to take into account the influence of flexible nodes,
not only in the structures sensible to deformations like low-rise domes, but also in the other structures, like
mobile phone towers, in which their serviceability limit state is decisive.
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