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Ductility demand seismic design of the curved rigid-frame bridge at the highway ramp

高速公路匝道曲线刚构桥延性需求抗震设计

基本信息

批准号：
10650473
负责人：
IZUNO Kazuyuki
金额：
$ 1.73万
依托单位：
Ritsumeikan University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650473/
关键词：
Rigid-Frame Bridge Seismic Design Earthquake Response Analysis Curved Bridge Level 2 Earthquake Highway Bridge Ductility Design Ramp Bridge 不当橋脚

项目摘要

Many curved rigid-frame bridges are under construction to connect the several highway networks. Though the earthquake response of the curved bridges are complicated compared to the straight bridges, the seismic design procedure for the curved rigid-frame bridges is not established yet. The aim of this research project is to clarify the basic earthquake response phenomena of the curved rigid-fame bridges.First, we evaluated the answers to the questionnaires of the bridge engineers. It was found that how to estimate the suitable initial cross section was the important problem for the bridge engineers, because the three-dimensional inelastic earthquake response analyses were still difficult and expensive to do.Then, the earthquake response analyses were carried out to study the effect of the cross angle of the curved rigid-frame bridge on the earthquake response. The modal analyses showed that the participation factors of the dominant modes decreased as the cross angle became smaller. The horizontal rotation of the beam elements was characteristic for the curved rigid-frame bridges. As the beam elements rotated during the earthquake responses, the displacement response of the piers were different from each other. On the other hand, the responses of the piers of the straight bridge were almost the same. This means that the modal analysis is important for the curved rigid-frame bridge.The three-dimensional inelastic model was necessary especially for the curved bridge whose cross angle was narrower than 120 degree.

许多曲线刚架桥正在建设中，以连接几个公路网。虽然曲线梁桥的地震反应比直线梁桥复杂，但曲线刚构桥的抗震设计方法还没有建立。本研究的目的是为了阐明曲线刚构桥梁地震反应的基本现象。首先，我们评估了桥梁工程师的问卷调查的答案。由于三维弹塑性地震反应分析的困难和昂贵，如何确定合适的初始截面是桥梁工程师面临的重要问题，为此，本文对曲线刚架桥进行了地震反应分析，研究了交叉角对地震反应的影响。模态分析表明，随着交叉角的减小，主模态的参与因子减小。梁单元的水平转动是曲线刚架桥的特征。在地震反应中，由于梁单元的转动，桥墩的位移反应是不同的。另一方面，直桥的桥墩的响应几乎相同。这说明对曲线刚架桥进行模态分析是非常重要的，尤其是对于交角小于120 °的曲线桥梁，必须建立三维弹塑性模型。