Limit State of Double-layer Lattice Domes of Different Member Layouts

To consider safety of double-layer lattice structures, it is important to determine the load carrying capacity and the deformation performance in the ultimate state. The initial yield load and the maximum load may be evaluated by post-buckling behaviour or elastio-plastic behaviour. The limit state load is presented for double-layer cylindrical lattice roofs, with the information of deformation performance in the ultimate state, see Ref [1].

Double-layer lattice structures are composed of the square pattern and the diagonal pattern in top and bottom layers, where have the member layouts of four types, and the arrangement of the mesh patterns are shown in figure 1. In this paper, the effect of member layout on the post-buckling behaviour and limit state load is investigated for double layer lattice domes. The other numerical parameter is the loading conditions. The limit state load estimated with the load-deformation relationship obtained by push-over analyses. The study tells that the structural characteristics of lattice structures depend upon mesh patterns and member layout.