木结构有限元建模技术与抗震性能分析

Finite Element Modeling Technologies and Analysis on Seismic Behaviour of Timber Structures

以汶川地震中四川昭化古城木建筑结构震损特征为工程背景,采用有限元程序SAP2000进行结构抗震建模技术分析,给出了材料属性、木结构节点定义及塑性铰设置、工况定义及分析控制等建模技术方法,并对抬梁式木结构在7度地震环境下进行Pushover分析。结果表明:木结构的榫卯节点属于半刚性节点,木结构整体偏柔性,不会在地震作用下产生很大内力,塑性铰依次在木枋—檩条—瓜柱中出现,水平构件先于竖向构件出现塑性铰,竖向构件在地震作用下主要发生侧脚滑移震损,这与实际情况相符合。

In this paper, the characteristics of seismic damage of timber buildings caused by the Wenchuan Earthquake in Zhaohua Ancient City are chosen as the engineering background, the SAP2000 finite element program is adopted to analyze modeling technologies on seismic resistance of＂ the structure, the modeling methods on material properties, definitions of the timber joint and positions of the plastic hinge, and definitions of the working condition and controls of the analysis are obtained. The results show that the mortise-tenon joint of timber structures is the semi-rigid joint, and a great internal force can not be created under earthquake action due to the flexible timber structures as whole; The plastic hinge takes turns to appear in wood frames-purlins-short columns, also the appearance in horizontal members is earlier than that in vertical members; The seismic damage of vertical members mainly includes the lateral foot and the slip. All of the above coincide well with the facts.