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Nonlinear Analysis of Thin-walled Spatial Steel Structures

NIE Guo-jun, ZHONG Zheng (Key Laboratory of Solid Mechanics of the Ministry of Education,Tongji Universit y,Shanghai 200092,China)  
Based on the space beam element analytical model,a new thin-walled beam element model considering the restrained torsion was derived in this paper.The elastic stiffness matrix of this new model is 14×14.The effect of axial force,shearing force,biaxial bending moment and bimoment was involved in the geometrical stiffn ess matrix of element.The yielding developments both across the section and alon g the axis of the member were taken into consideration by the finite-cut of ele ment,and the elasto-plastic analysis of thin-walled spatial steel structures w as achieved.Numerical examples prove the correctness of the analysis model of t his paper,and show the characteristics of warping restraint torsion of thin-wal led spatial structures.
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