Method establishment for the fracturing/collapsing process simulation of wooden houses under seismic loading

地震荷载下木结构房屋破裂/倒塌过程模拟方法建立

基本信息

批准号：
16380114
负责人：
OHTA Masamitsu
金额：
$ 9.98万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16380114/
关键词：
wooden frame house earthquake collapsing process continuous column tenon opening lack of cross-sectional area high speed loading extended distinct element method 塑性挙動木造住宅荷重速度

项目摘要

Our final goal is to establish a calculating method for the simulation of the behavior of wooden houses under big earthquake. Qualitative simulation of the collapsing process for the traditional wooden houses was made successfully by the research until now. Though there were some hurdles to make this simulation technique to the quantitative one which was comparable to the finite element method. Some of these hurdles were overcome already for example, the behavior of the column-sill connection was parameterized by the experiments on the connecting part with various fasteners. The fracturing behavior of mortars wall was also becoming clear. In this research project, our main target was to clarify the behavior and the performance of the continuous columns which include large tenon openings. Real size columns with single to four direction(s) opening were subjected to static and dynamic bending tests. In static test, specific Young's modulus and bending strength decreased with the increasing loss of cross sectional area. Though the decreasing rate of specific Young's modulus were less than the expected values. It seemed that there were not so large stress concentration which require the fracture-mechanical consideration. Under the big earthquake, continuous columns receive high speed loading. Corresponding to this situation, we made dynamic bending test with the loading rate of 2 m/sec. We anticipated that the influence of the section loss by tenon openings becomes more important in dynamic loading than in static one. But the experimental results were inverse. Both the specific Young's modulus and the bending strength were increased in dynamic loadings in comparison with the static cases. It is our future subject to make these results reflect on the parameter decision for the simulation.

我们的最终目标是建立一种计算方法，以模拟大地震下的木制房屋的行为。到目前为止，该研究成功地对传统木制房屋进行了崩溃过程的定性模拟。尽管有一些障碍可以使这种模拟技术与有限元方法相媲美的定量技术。例如，其中一些障碍已经克服了，例如，柱状连接的行为是通过与各种紧固件的连接部分上的实验参数化的。迫击炮墙的破裂行为也变得越来越清晰。在该研究项目中，我们的主要目标是阐明包括大型轨道开口在内的连续柱的行为和性能。具有单向开口的单一到四个方向的实际尺寸柱经过静态和动态弯曲测试。在静态测试中，随着横截面区域损失的增加，特定的杨氏模量和弯曲强度降低。尽管特定杨氏模量的降低速度小于预期值。似乎没有那么大的应力浓度需要裂缝机械考虑。在大地震下，连续柱接收高速载荷。与这种情况相对应，我们进行了动态弯曲测试，负载率为2 m/sec。我们预计，田纳型损失在动态载荷中比静态损失更为重要。但是实验结果是逆的。与静态病例相比，在动态载荷中，特定的年轻的模量和弯曲强度都提高了。使这些结果反映模拟的参数决策是我们未来的主题。