Research On Earthquake Coupling Effects Of Space Truss Structure With Roofing System And Piping System

The non-structural system refers to the fixed elements in building structure which including partition walls,roofs,electromechanical devices and furnishings.Investigations had found that for some public buildings such as airport,hospital,gymnasium and theatre,the investment for the non-structural components even exceed the investment for the major structure.However,most of the researchers ignored the non-structural components when conducting traditional seismic design.In many multi-earthquake-happening countries,with the improvement of the seismic design codes,the earthquake damage in major structural components has significantly reduced.In contrast,the earthquake damage in the non-structural components is more outstanding as a result.Thus,this paper studies the strong earthquake failure mechanism of two types of non-structural components,i.e.roofing system and piping system under earthquake and the coupling dynamic effect with the space truss structure.The main work are as follows:Considering the non-structural system,the seismic response and failure mechanism of the space truss structure were researched.The anti-rotation capacity of the bolted spherical joints and welded spherical joints were considered,and the finite element model of the semi-rigid joints were established and applied in the seismic response analysis of the space truss structure.Compared with the traditional modeling method of the space truss structure,the effect of roofing system and piping system on the seismic response of the space truss structure was considered,thus more accord with the practical condition.Adopting the commercial finite element software ABAQUS,the refined finite element model of the roofing system was established by using Python language,which may offer a reference for the numerical modeling of the non-structural components.Considering the coupling effect of the roofing system and the major structure,the seismic response of the separate space truss structure model and the whole model(including roofing system)were compared.The failure modes of the roofing system under strong seismic action were analyzed,and the effect of the span and seismic wave are evaluated.Experiments were conducted to analysis the axial loading performance of the piping components.Three types of loading modes including simple tension test,uniaxial compression test and cyclic test,were studied for piping joints of threaded connection and grooved connection respectively.The effect of piping diameter was analyzed,and the failure modes of the piping joint and its limit capabilities were obtained,which enriching the vulnerability research database of the non-structural elements.Adopting the commercial finite element software ABAQUS,the refined finite element model of the space truss structure-piping system was established by using Python language.Under the premise of considering the coupling effect between piping system and the space truss structure under earthquake,the failure modes and its probability under strong earthquake of piping system were analyzed,and the failure states were classified into several levels.In addition,the effect of different arrangement modes were analyzed.