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Verification of seismic performances of wooden shear walls by pseudodynamic lateral loading tests

拟动力侧向荷载试验验证木剪力墙抗震性能

基本信息

批准号：
14560131
负责人：
YASUMURA Motoi
金额：
$ 2.3万
依托单位：
Shizuoka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

Pseudodynamic lateral loading tests were conducted on the conventional wooden shear walls and the two story structures composed of these shear walls. Seismic behavior of shear walls and the influence of the shear stiffness of the second story on the seismic behavior of whole the structure were investigated. Shear walls had 3000mm in length and 3000mm in height, and two story structures had 3000mm width, 3000mm depth and 6000mm height. Seven and a half millimeters thick plywood was nailed on one face of the structure with N50 nails at the intervals of 150mm. At the behind frame, no lateral resisting elements were applied, and steel braces of 16mm diameters were attached on the perpendicular frames and horizontal frames. Hold-down connections were applied at the fool of the first story to prevent the up-lift of the posts. Five types of specimens consisting of shear walls with window, door and slit type openings on the first and second stories were prepared and the lateral loads were applied step-by-step at the top of the first and the second stories by simulating the seismic response based on the NS components of 1940 El Centro accerelogram scaled to 0.4G. In each specimen, 2.5t of masses were assumed both on the first and the second stories. The displacement responses of the first and second stories by the pseudodynamic tests were compared with the results of the time-history earthquake response analysis. The simulation with two lumped masses predicted quite well the response of the first story, but tended to underestimate that of the second story. However FE model predicted quite well the responses of both the first and the second stories, and it was shown that such a sophisticated FE model predicts the seismic behavior of timber structures better than the lumped mass model.

对常规木剪力墙及由该剪力墙组成的两层结构进行了拟动力侧向荷载试验。研究了剪力墙的抗震性能以及第二层剪力刚度对整个结构抗震性能的影响。剪力墙长3000mm，高3000mm，两层结构宽3000mm，深3000mm，高6000mm。七点半厚的胶合板用N50钉子以150毫米的间隔钉在结构的一个面上。后框架不采用侧向抵抗元件，垂直框架和水平框架上均附有直径16mm的钢支撑。在第一个故事的傻瓜处应用了压紧连接，以防止柱子升起。准备了五种由一、二层带窗、门和狭缝式开口的剪力墙组成的试件，并根据 1940 年 El Centro 加速度图的 NS 分量（比例为 0.4G）模拟地震响应，在第一层和二层顶部逐步施加侧向荷载。在每个样本中，第一层和第二层的质量均假定为 2.5 吨。将拟动力试验得到的第一层和第二层的位移响应与时程地震响应分析的结果进行了比较。两个集中质量的模拟很好地预测了第一个故事的响应，但往往低估了第二个故事的响应。然而，有限元模型很好地预测了第一层和第二层的响应，并且结果表明，这种复杂的有限元模型比集中质量模型能够更好地预测木结构的地震行为。