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对简支边界条件的压弯矩形钢板进行了考虑几何和材料非线性、残余应力、初始几何缺陷的非线性分析,得到弯矩-边缘纤维压应变曲线和弯矩-曲率曲线,按照两种曲线上延性系数的定义确定不同通用宽厚比下板件的延性系数,拟合了压弯板延性系数计算式。分析表明,按曲率定义延性小于按边缘纤维压应变定义的延性。另外根据面向抗震设计的钢构件截面分类的方法,利用结构延性需求与截面延性需求的关系和得到的截面延性需求的计算式,区分结构影响系数中是否包含超强系数,对各类截面板件的宽厚比进行分界,并拟合了宽厚比分界与结构影响系数的相关计算式。
The bending moment - curvature curves of bending moment - edge fiber were obtained considering the geometrical and material nonlinearity, residual stress and initial geometric imperfection of the pressed - and - bent rectangular steel plates with simple supported boundary conditions. According to two kinds The definition of ductility coefficient on the curve The ductility coefficient of the plate under different general aspect ratio is determined, and the ductility coefficient of the bending plate is fitted. The analysis shows that the ductility defined by curvature is less than the ductility defined by the edge-fiber compressive strain. In addition, according to the method of section classification of steel members facing seismic design, the relationship between structural ductility demand and section ductility requirement and the formula of ductility demand obtained are used to distinguish whether the structural influence coefficient contains super-strong coefficients. The ratio between aspect ratio and structure influence coefficient is fitted.