Circular steel tube truss is mainly used in civil engineering and marine engineering.In addition to vertical load,it is also vulnerable to impact accidental load.In this paper,the impact resistance of steel truss under eccentric mass was taken as the research object,and the finite element model of joint impact was established using LS-DYNA software.The impact resistance was studied from the aspects of failure characteristics,impact response and energy dissipation capacity.The parameters of impact times,impact velocity and steel yield strength were analyzed.Finally,based on the finite element simulation results,the expression between the deformation of the main pipe and the rotation angle was proposed.The results show that the main pipe has serious depressed deformation and significant reduction in stiffness after multiple pendulum impacts.When the impact speed reaches 3.0 m·s-1,the peak impact force increases by 84.8%.The branch pipe joints in the impact area have extrusion bending failure.The main pipe depression is the main energy dissipation mechanism,and the finite element simulation results provide a basis for improving the impact resistance of the actual steel truss.
关键词
钢桁架/有限元分析/变形机理/抗冲击性能/破坏模式
Key words
steel truss/finite element analysis/deformation mechanism/impact resistance/failure mode
维普
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