欧洲规范2正截面承载力计算的应变法  

Strain Method of the Bearing Capacity Calculation of Normal Sections in Eurocode 2

作　　者：章胜平[1] 陈旭[2] 宋高丽[1] 马江鸿 周卫霞[2] ZHANG Shengping;CHEN Xu;SONG Gaoli;MA Jianghong;ZHOU Weixia(College of Construction Engineering,Kunming University of Science and Technology, Kunming 650504, China;College of Construction Engineering,Kunming University, Kunming 650214, China)

机构地区：[1]昆明理工大学建筑工程学院,昆明650504 [2]昆明学院城乡建筑工程学院,昆明650214

出　　处：《结构工程师》2019年第4期55-59,共5页Structural Engineers

基　　金：国家自然科学基金(51868034,51668027);昆明学院引进人才科研项目(YJL16010)

摘　　要：弯矩-轴力相关曲线上各点的应变分布具有很强的规律性,利用该规律可由应变法直接计算抵抗弯矩和轴力,求解过程无须数值迭代。采用欧洲规范2的极限状态可能的应变分布图,以所有可能的应变为自变量,代入本构关系求应力,可得到所有可能的抵抗内力。选择截面由轴心受拉、拉弯、纯弯、压弯到轴心受压的15组极限状态应变分布,基于截面纤维模型计算混凝土和钢筋的内力,得到抵抗弯矩和轴力,以及弯矩-轴力相关曲线。该法能够用于任意本构关系和任意截面。Strong regular strain distributions exist on the interaction curve of moment and axial force,by which the resistances can be directly calculated without numerical iteration.Using possible strain distributions in the ultimate limit state of Eurocode 2 and taking all these possible strains as independent variables,stresses can be obtained by substituting them into constitutive relationship,along with all the possible resistance to internal forces.The 15 sets of strain distributions in the limit state are selected for sections from the axial tension,bending under tension,pure bending,bending under compression,to axial compression.The process is based on section fiber model to calculate internal forces of concrete and steel,and then the resistances and its interaction curve are obtained.The method can be used in arbitrary constitutive relationship and cross sections with general shape.

关 键 词：钢筋混凝土 正截面承载力 应变分布 纤维模型 

分 类 号：TU398.9[建筑科学—结构工程]