Finite element analysis of static and dynamic performance of roof structure with steel tubular truss

An arch-truss roof structure with circular steel tube is applied to a gymnasium in Wuhan City,which is supported by two three-dimensional trusses with square steel tube.Considering ten kinds of different load combinations,variaton of axial force along with the span have been obtained.In order to recognize influence of boundary conditions on the ultimate load-bearing capacity of arch-truss,elastic-plastic nonlinear analyses have been investigated for four kinds of different selected models,and load-displacement curves have been obtained.The connections between arch-truss and spatial truss are set to hinged support and fixed support separately,and modal analysis for this overall roof structure has been acted.Natural frequency and modes are compared and analyzed,and principle of superposition has also been used to research its seismic performance by applying ANSYS software.The analysis results demonstrate that support rigidity makes remarkable influence on the ultimate load-bearing capacity of arch-truss,but horizontal earthquake only has a little effect on overall roof structure.This roof structure can meet the requirements of load-bearing capacity and deflection.It also has some emergency capacity.