考虑有侧移框架结构二阶效应的偏心距增大系数法的改进  

Improvement of moment amplification factor method considering second-order effect in lateral sway frame

作　　者：刘毅[1] 朱爱萍[2] 魏巍[1] 白绍良[1] 

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]中国建筑科学研究院建筑结构研究所,北京100013

出　　处：《建筑结构学报》2008年第5期114-119,共6页Journal of Building Structures

基　　金：国家自然科学基金资助项目(59678035)

摘　　要：从已经得出的框架结构二阶效应规律来看,我国《混凝土结构设计规范》(GB50010—2002)中用来反映有侧移框架结构P-Δ效应规律的偏心距增大系数法(或称ηs-l0法)不论从力学概念上还是方法上都有待作出根本性改进。本文在阐述了有侧移框架结构中P-Δ效应和P-δ效应的规律后,提出了能同时考虑层效应特征和引起结构侧移弯矩作用下的非弹性曲率增量特征的ηs-l0法改进方案。通过对比分析证实了改进后的方案能较准确反映框架结构P-Δ效应的真实规律,并与美国规范对应方法以及层增大系数法具有等效性。Based on the regularity of second-order effect in lateral sway frame, the eccentricity or moment amplification iactor method （ η-lo method ） considering P-△ effect in ＇ Code for design of concrete structure＇ （ GB 50010-2002 ） needs improvement. Discussing the demonstrating the regularity of P-△ effect and P-δ effect in sway frame, a convenient new η-lo thod was proposed, which considered characteristics of magnified nonlinear curvature caused by the sway moment and the characteristics of story-effect. After careful comparison, the rational rule of p-△ effect in sway frame was reflected, and the accuracy of the proposed method was as same as the corresponding method in ACI, and floor magnification factor method also.

关 键 词：钢筋混凝土 框架结构 二阶效应 偏心距增大系数法 

分 类 号：TU375.4[建筑科学—结构工程] TU318.1