受压和受弯板延性系数和面向抗震设计的钢截面分类  

DUCTILITY FACTORS OF PLATES AND SECTION CLASSIFICATION FOR SEISMIC DESIGN

作　　者：童根树[1] 付波[1] 

机构地区：[1]浙江大学土木工程系,浙江杭州310058

出　　处：《工程力学》2013年第3期323-330,共8页Engineering Mechanics

基　　金：国家自然科学基金项目(51078328)

摘　　要：对不同边界条件的均匀受压和受弯矩形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,得到压力-压缩曲线和弯矩-曲率曲线,确定不同通用宽厚比下板件的延性系数,提出各类板件的延性系数计算公式。根据计算地震力的结构影响系数的大小,提出了面向抗震设计的钢构件截面分类的方法,利用结构延性与截面延性系数的关系和该文得到的截面延性系数的计算公式,以及结构影响系数中是否包含超强系数,分别给出了各类截面板件的宽厚比分界。Considering the geometric and material nonlinearity, residual stress, and initial geometric imperfections, steel plates with different boundary conditions are analyzed under uniform compression and pure bending. The average stress-strain and moment-curvature curves are obtained. Based on the definition of ductility factors, the relation between ductility factors and plate slenderness are obtained and approximate formulas for the ductility factors are proposed. According to the values of the structural performance factor used to determine the base shear of a seismic action, the paper proposed a new classification for steel cross-sections oriented to the seismic design. Using the relation between the system ductility and the cross-sectional ductility, and based on whether an overstrength factor is included in the structural performance factor, the paper tentatively proposed the limiting values of the width-to-thickness ratio.

关 键 词：延性系数 宽厚比 截面分类 抗震设计 非线性分析 

分 类 号：TU391[建筑科学—结构工程]