钢桁架连梁非线性有限元分析

摘要

In this paper,concrete and ductile metal plaatic damage model was considered,and nolinear FEA method was carried on to analyze the mechanical property of steel truss coupling beam. Through the comparation of experimental and theoretical analysis results, the nonlinear finite element analysis method shows high precision. In this paper, parameter analysis shows that only in strengthening chord and web member while make both mutual matching,can assure increasing the bearing capacity and ductility of the structure,only enhancing chord or web member may cause inharmonious structure stress, but increasing horizontal web members can effectively improve the ultimate bearing capacity of the structure.%考虑混凝土和韧性金属损伤塑性模型,对钢桁架连梁的受力性能进行了非线性有限元分析.通过试验研究与理论分析的对比,表明本文的非线性有限元分析方法具有较高的精度.通过本文的参数分析表明:只有在增强弦杆和腹杆的同时使两者相互匹配,才能保证结构承载力和延性的提升,单纯增强弦杆或腹杆可能导致结构受力的不协调,增加直腹杆能有效的提高结构的极限承载力.