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Field Investigation on Dynamic Behavior of Soil and Building Structures in the Near-Fault Region of the 1999 Chi-Chi, Taiwan Earthquake

1999年台湾集集地震近断层区土壤和建筑结构动力特性现场调查

基本信息

批准号：
12574006
负责人：
KAWASE Hiroshi
金额：
$ 4.61万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
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

The purpose of the project is to understand the damage mechanism of structures built in the near-fault regions based on the field investigation of the 1999 Chi-Chi, Taiwan, earthquake, in which we have invaluable strong ground motions observed by a recent network of high resolution seismometers. To this end we deployed temporarily an aftershock observation network and we also conducted microtremor observeation for both soil structures and building structures to understand their dynamic behavior. We first investigate observed strong motions based on the ground property of the sites in a near-fault region and estimate strong motions for sites without observed records.In the year 2000 we conducted for two weeks microtremor array and single-station survey in the Taichung area in order to delineate the S-wave velocity structure of the Taichung Basin. Microtremors in typical buildings in Taichung were also measured. We then performed nonlinear analysis of building models established for Japan to understand the damage potential of the observed strong motions in the near-fault region. It turns out that most of the strong motions observed in the near-fault area do not show strong damage potential except for two records, which show the same spectral levels in the intermediate period range (〜1 sec) with the records in Kobe. In the year 2001 we explored underground S-wave structures in the Taipei Basin, which may have much devastating damage if a big event happen in near future. Based on these information we are ready to evaluate damage potential of the structures in Taiwan and we can compare damage potential of buildings in Taiwan and Japan.

该项目的目的是在1999年台湾集集地震现场调查的基础上，了解在近断层地区建造的建筑物的破坏机制。在那次地震中，我们用最近的高分辨率地震仪网络观测到了宝贵的强地面运动。为此，我们临时部署了余震观测网，并对土壤结构和建筑结构进行了微震观测，以了解它们的动力学行为。我们首先根据近断层区场地的地面性质调查已观测到的强震，并对无观测记录的场地进行强震估计。2000年，我们在台中地区进行了为期两周的微震台阵和单台观测，以圈定台中盆地的S波速度结构。台中典型建筑的微震也被测量到。然后，我们对为日本建立的建筑模型进行了非线性分析，以了解在近断层区域观测到的强震的破坏潜力。结果表明，在近断层区观测到的大部分强震都没有显示出很强的破坏潜力，只有两个记录显示了与神户记录相同的中周期(~1s)谱水平。2001年，我们在台北盆地勘探了S波地下构造，如果在不久的将来发生大事件，可能会造成极大的破坏性破坏。基于这些信息，我们准备评估台湾地区建筑物的破坏潜力，并可以比较台湾和日本建筑物的破坏潜力。