Seismic Performance and Soil Structure Ineteraction effects of Earth quake Response of Cable-Stayed Bridge Towers

斜拉桥塔地震反应的抗震性能与土结构互作效应

基本信息

批准号：
18560459
负责人：
HAYASHIKAWA Toshiro
金额：
$ 2.34万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560459/
关键词：
Cable-stayed bridge Seismic performance Dynamic interaction Dynamic response analysis Lever 2 earthquake Energy dissipation system Fiber elements Initial imperfection アァイバー要素レベルII地震動エネルギ吸収機構

项目摘要

A nonlinear dynamic analysis including soil structure interaction is developed to assess the effects of soil-structure interaction on the seismic response and dynamic performance of the cable-stayed bridge steel towers. Numerical results indicate that considering soil foundation interaction and soil nonlinearlities can reduce response of the tower model. The soil yielding below the foundation and uplift at the interface have significantly contribution to foundation rocking response.Passive control techniques are aimed at reducing and possibly eliminating plastic deformations of structures under strong earthquakes, by exploiting a predetermined favorable behavior of special devices inserted in the tower to provide a more flexible rocking or uplift of the bridge pier foundation. The numerical results show that allowing of limited rocking can reduce demands on the bridge structure, effectively acting as an isolation mechanism. The consideration of rocking as an acceptable mode of response can impact design costs by reducing the required footing size. In addition the simultaneous rocking of a properly designed foundation and flexural deformation of the supported-column is expected to eliminate or substantially reduce damage in the column and residual displacements in the bridge following a major earthquake.Anew challenge to the earthquake engineering community is to develop new technologies that could improve the seismic performance of bridges. These new technologies consist of new construction materials (smart materials) and protective system. Shape memory alloy material concepts to improve the bridges seismic performance, are suggested by providing base plate anchor bolts at the tower base. The calculated results prove the effectiveness of using shape; memory alloy bolts in reducing structural element forces and control tower displacement for seismic design.

开发了包括土壤结构相互作用在内的非线性动态分析，以评估土壤结构相互作用对缆线固定桥钢铁塔的地震反应和动态性能的影响。数值结果表明，考虑土壤基础的相互作用和土壤非线性可以减少塔模型的响应。界面下基础下方和隆升的土壤对基础摇摆响应有显着贡献。通过利用在塔中插入的特殊设备的预定良好的有利行为，旨在减少强烈地震下结构的塑性变形，并可能消除结构的塑性变形。为了提供更灵活的摇摆或抬高桥码头基础。数值结果表明，允许有限的摇动可以减少对桥结构的需求，从而有效地充当隔离机制。将摇摆视为可接受的响应方式可能会通过降低所需的基础尺寸来影响设计成本。此外，同时摇摆正确设计的基础和支撑列的弯曲变形，预计将消除或大大减少大地震后桥梁中的损坏，而对地震工程社区的挑战是发展可以改善桥梁的地震性能的新技术。这些新技术由新的建筑材料（智能材料）和保护系统组成。通过在塔底部提供底板锚螺栓，建议提出形状的内存合金材料概念以改善桥梁地震性能。计算的结果证明了使用形状的有效性；记忆合金螺栓在减少地震设计的结构元素力和控制塔位移中。