【摘要】 结构的二阶效应泛指作用在结构上的重力或构件中的轴向压力在产生了层间位移和挠曲变形后的结构或构件中引起的附加变形和相应的附加内力,包括结构整体的侧移二阶效应(P-Δ效应)和受压构件的挠曲效应(P-δ效应)两部分.简要介绍了我国新版GB 50010-2010《混凝土结构设计规范》关于二阶效应设计规定修订的主要内容和相关背景资料,可供相关工程技术人员借鉴和参考.与原规范GB 50010-2002《混凝土结构设计规范》相比,新规范关于二阶效应设计规定修订的要点为:1)结构的侧移二阶效应可采用有限元分析方法计算,也可采用规范附录B所给出的近似计算结构侧移二阶效应的增大系数法,不再采用原规范的η-l0法;2)对于构件自身挠曲引起的二阶效应(P-δ效应)的计算,则允许采用柱截面偏心距增大系数(或弯矩增大系数)的传统方法,但相应的计算公式作了重大修改.更多还原

【Abstract】 Second-order effect is referred to the additional deformation and corresponding internal force caused by axial forces or gravity applied to the structural members and bars that have interbedded displacement and deflection.It may commonly consists of two parts:the lateral displacement second-order effect of the whole structure,commonly called P-Δeffect and deflection second-order effect of compression members,commonly called P-δeffect.Main revision contents and background materials of new edition of GB50010-2010 code for design of concrete structures is introduced,which can provide some references for the engineers and technicians concerned.In comparison with the concrete structures design code of GB 50010-2002,modifying second-order effect design stipulations of new code have following important points:1)Finite element analysis can be used in calculation of analysis the lateral displacement second-order effect of structures.Magnifying coefficient method given in the appendix B of the code can also be used to calculate it approximately.Theη-l0method of former standard will fall out of use.2)The traditional method,eccentricity magnification coefficient of columns cross-section method,can be used in deflection second-order effect of compression members calculation.But the corresponding calculation formula made significant changes.更多还原