Response of steel bridge piers subjeceted to strong ground motions in the arbitrary horizontal direction and their seismic design concept

任意水平方向强地震动作用下钢桥墩的响应及抗震设计理念

基本信息

批准号：
12650475
负责人：
SUGIURA Kunitomo
金额：
$ 2.69万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

项目摘要

Carried out in 2000 was the development of the data-base for the strength and the ductility of steel hollow members subjected to axial force and bi-directional bending, paying attention to local buckling behavior in conjunction with slenderness parameters of members. Assessment on the cross sectional shape such as rectangular and circular was also made. In particular, the three dimensional loading testing available at Kyoto Univeristy was utilized to obtain such strength and ductility. Based on the experimental results as well as the analytical results by the general-purpose finite element code ABAQUS, the equivalent scalar parameter to define the strength and ductility, namely the square root of summation of square of each component in biaxial bending state under constant axial force. By using this parameter, effect of all the different displacement paths on the envelop curve of load-deflection curves up to the maximum strength point are equally evaluated, and the significant strength degradation for complex biaxial loading was found.In 2001, following the static loadings test on steel bridge piers, the response analysis and pseudo-dynamic loading tests were carried out in order to verify the applicability of strength and ductility evalution formula proposed previously. Artifitial ground motions were also unilized to assess the variation of the response. It is concluded that the nature of three dimentional ground motions affects the response of bridges, resulting the urgent task to quantify such effect by taking into consideration the structural unsyfnmetry such as the directions of bridges and its perpendicular direction.

在2000年进行的是数据库的发展，以轴向力和双向弯曲的钢制空心成员的强度和延展性，并与成员的细长参数一起关注局部屈曲行为。还对横截面形状（例如矩形和圆形）进行了评估。特别是，在京都大学提供的三维负载测试用于获得这种强度和延展性。基于实验结果以及通过通用有限元代码ABAQUS的分析结果，即定义强度和延展性的等效标量参数，即在恒定轴向力下双轴弯曲状态下每个组件平方的平方根的平方根。 By using this parameter, effect of all the different displacement paths on the envelop curve of load-deflection curves up to the maximum strength point are equally evaluated, and the significant strength degradation for complex biaxial loading was found.In 2001, following the static loadings test on steel bridge piers, the response analysis and pseudo-dynamic loading tests were carried out in order to verify the applicability of strength and ductility evalution formula proposed 之前。人伪装地面运动也被统一以评估响应的变化。结论是，三维基地运动的性质会影响桥梁的响应，从而通过考虑结构上的UNSYFNMETRY，例如桥梁的方向及其垂直方向来量化这种效果。