尹犟^*， 杨文昌

（  中南林业科技大学土木工程与力学学院, 长沙 410004；  ）

摘要： 静力弹塑性分析方法(Pushover方法)是指按一定荷载模式对结构逐级施加水平静力荷载直至其达到极限状态或倒塌，该法分析精度较高、计算简便、适用性很广。但常规Pushover方法无法反应结构高阶振型的影响，一般只适用于地震反应以第一振型为主的结构。对于木结构建筑而言，大开间外墙和一层车库会严重削弱其底层的强度和刚度。许多早期的木结构建筑并未对其底层进行特殊加固处理，这类木结构建筑在强震作用下很可能形成层间破坏，进入非线性状态后的位移反应形态势必与第1阶弹性振型存在很大差异。本文基于常规Pushover方法很难准确估计所有类型的木结构建筑的地震位移需求。建议了两种适用于木结构建筑的修正Pushover分析方法。修正方法Ⅰ考虑木结构建筑屈服后振动特性的改变，修正方法Ⅱ同时考虑结构屈服以及近场地震的竖向效应的影响。
关键词： 木结构建筑;Pushover方法;第一振型;近场地震

YIN Jiang^*， YANG Wenchang

（  Central South University of Forestry and Technology；  ）

Abstract： Static elastoplastic analysis method (Pushover method) is to point to in a certain load patterns exert horizontal static load on structure step by step until it reaches the limit state or collapsed, the analysis of high precision, simple calculation, a very wide applicability. But the conventional Pushover method cannot response the influence of the structural high order modes, generally only applies to the structure of the seismic response is given priority to with the first vibration mode. For the wooden structure, exterior wall of big width room and a garage will severely weakened its underlying layer of strength and stiffness. On its underlying many of the early timberwork building is not special reinforcement, this kind of wooden structure under earthquake action is likely to damage between cambium, into the displacement response of nonlinear state after the form is bound and there are considerable differences in their first order elastic vibration mode. In this paper, based on the conventional Pushover method is difficult to accurately estimate the all types of seismic displacement demand of wood construction. Suggested that the two kinds of suitable for modified Pushover analysis method of wood construction. Correction approachⅠwood structure yield after the change of the vibration characteristic, correction method Ⅱ yield at the same time considering structure and near-field earthquake effect of the vertical. 
Keywords： timber building;pushover method;The first vibration mode ;Near-field earthquake

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