无侧移单元闭合框架P-δ效应的研究  

Analysis of p-δ Effect for Non-sway Cell-closed Frame

作　　者：刘毅[1] 李战平[1] 朱占友[1] 白绍良[1] 

机构地区：[1]重庆大学土木工程学院,重庆400045

出　　处：《重庆建筑大学学报》2006年第6期51-54,共4页Journal of Chongqing Jianzhu University

基　　金：国家自然科学基金资助项目(59678035)

摘　　要：为了判断无侧移单元封闭框架柱在考虑轴力p-δ效应下柱端弯矩的变化规律,提出了综合梁柱约束类型及节点二阶附加转角的判断法则;并经过典型算例结果的检验与证实。当节点转动是由梁端引起时,若考虑p-δ效应后节点转角增大,则意味着由于柱对梁端的约束作用减弱,柱端弯矩与梁端弯矩将变小;反之,则梁端受到柱端的约束效应增强,那么柱端弯矩与梁端弯矩将增大。当节点转动是由柱端转动引起时,由于作为柱端转动约束构件的梁抗弯刚度保持某一常量,如果考虑p-δ效应后,节点附加转动增大了原节点转角,那么梁端弯矩就会增大,从而使与之相连接的柱端弯矩也相应增加;反之,若节点附加转角减小了节点转角,则梁端约束弯矩减小,而减小与之连接的柱端弯矩。To figure out the law of the variety of the moment at the end of a column in a non - sway cell - closed frame when the second order P-δ effect is under consideration, a rule based on the type of restrain relationship of the beam and the column plus the second order additional rotation of the joint was presented, which was illustrated and verified by the results of typical examples. When the rotation of node is caused by the girder and the rotation is added after P-δ effect is considered, thus ,the constraint to the beam is weakened, and the moment of girder and column decreases and vice versa. When the rotation of node is caused by column and the rotation is added after P-δ effect is considered, since the EI of the beam is invariability,thus the moment of girder and column increases and vice versa.

关 键 词：无侧移单元封闭框架 P-Δ效应 二阶附加转角 

分 类 号：TU375.4[建筑科学—结构工程]