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Detailed investigation of demaged briges due to Chi-Chi earthquake.

对集集地震受损桥梁的详细调查。

基本信息

批准号：
14404001
负责人：
KOSA Kenji
金额：
$ 5.5万
依托单位：
Kyushu Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
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

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14404001/
关键词：
Chi-Chi earthauke earthquake design earthquake damage bridge displacement due to fault rapture gider collision 地盤被害

项目摘要

Several following numerical analyses were performed which were modeled dameged bridges due to Chi-Chi earthquake.1)Ji-Ji-Da Bridge suffered problematic damage which is unaccetable in terms of seismic design of this type of bridge. For example, Plastic hinges were produced not only at the pier bottom but also in the main pylon and main girder, and one diagonal cable pulled out from the anchorage section. The damage mechanism of this bridge was analyzed using a frame model, with the incorporation of field measurement results and detailed drawings obtained from bridge administrators in Taiwan. It was found that the cause of cable pullout was the unsufficient anchoring strength.2)Seismic damage analysis was conducted on the Chang-Geng Bridge damaged in the 1999 Chi-Chi Earthquake in Taiwan. This bridge sustained peculiar damage that two girders fell to the ground even though the girder did not show any fault displacement. The cause of the fall was assumed to be the horizontal displacement of the girders when they collided under seismic loading. Through nonlinear dynamic analysis using field measurement results and detailed drawing obtained from the administrator of the bridge, it was confirmed that the girders were pushed toward the parapet and collied from the back under seismic loading, resulting in the fall from the piers.

对因集集地震而受损的桥梁进行了以下几项数值分析。1）集集大桥遭受了问题性损坏，这对于此类桥梁的抗震设计来说是不可接受的。例如，不仅在桥墩底部制作了塑料铰链，而且在主塔和主梁上也制作了塑料铰链，并从锚固部分拉出了一根斜拉索。结合台湾桥梁管理人员的现场测量结果和详细图纸，使用框架模型分析了该桥的损坏机制。结果发现，拉索的原因是锚固强度不够。2)对1999年台湾集集地震中受损的长庚大桥进行了震害分析。这座桥遭受了特殊的损坏，尽管大梁没有出现任何断层位移，但有两根大梁倒塌。坠落的原因被认为是梁在地震荷载下碰撞时产生的水平位移。通过现场测量结果和桥梁管理人员提供的详细图纸进行非线性动力分析，证实梁在地震荷载作用下被推向女儿墙并从后面碰撞，导致桥墩坠落。