Development of numerical analysis method for high precise prediction of wooden frames subjected to strong ground motion

近期木结构建筑在强震作用下的破坏，表明了采用基于地震反应分析的合理设计方法的必要性。本研究针对地震作用下木结构结构的高精度预测进行了数值分析方法的开发。木框架的性能受连接结构特性的影响。在达到极限行为时，框架发生较大位移。因此，引力效应是不可忽视的。本文提出的数值计算方法是在构件模型的边缘处加入滞回弹簧。通过对接头的反复试验，建立了弹簧的滞回模型。为了实现高精度的弹塑性分析，在公式中使用了增量摄动法。此外，采用运动坐标系来评价重力效应。此外，通过多次连接试验提供的实验曲线，提出了建立弹塑性弹簧模型滞回规律的方法，并将其应用于分析程序。

The damage of the recent wooden building subjected to strong earthquake motion shows necessity of a rational design method based on earthquake response analysis. In this study, development of numerical analysis method is carried out for high precise prediction of wooden frames under earthquake. Behavior of a wooden frame is influenced by structural characteristic of the connections. At the time of the ultimate behavior, large displacement occurs in frame. Therefore the gravity effect cannot be ignored.A numerical method proposed in this study consists of a member model with hysteretic springs on the edges. The hysteretic model of spring is assumed based on the repeated tests of connections. To enable highly precise elastic-plastic analysis, the incremental perturbation method is used in the formulation. In addition, a moving coordinate system is adopted to evaluate a gravity effect.Moreover, technique to make hysteretic law of elastic-plastic spring model to use for an analysis program is suggested by experimental curves provided by some repeated tests of connections.