Fundamental Study on Probabilistic Evaluation of Earthquake Load

地震荷载概率评估基础研究

基本信息

批准号：
04452246
负责人：
KANDA Jun
金额：
$ 4.03万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04452246/
关键词：
Seismic hazard analysis Critical input Linear phase property Log-normal variables Micro-tremor measurement Tall building Reliability index Minimum total cost 地震危険度プレート境界地震降伏せん断力係数モード形状

项目摘要

Many aspects for the probabilistic estimation on the erathquake response have been considered. At first an improved seismic hazard analysis is proposed by the use of an isolated model of earthquake occuring on plate boundaries and by assuming appropriate upper boundary of maximum velocity for the earthquake ground motion. Generation methods of the critical input wave for dynamic responses are developed for various types of models. For origine oriented hysteresis models linear phase properties to the frequency components are used and for normal bi-linear hystresis models a phase property which causes large values of the time history with equally spaced time interval is used. The distoribution function of the sum of two log-normal variables is approximated by a log-normal distribution with proposed parameters. The accuracy of the approximation is examined by the Monte-Carlo method for some check points. It is recognized by micro-tremore measurements that the natural frequency of existing buildings is shorter and the damping ratio is less for higher modes than those used at the design. Parameters on dynamic properties of tall buildings, i.e.the mass-stiffness ratio and the yield shear force coefficient and so on, are examined statistically. Representative dynamic models are demonstrated by 6 models for S structures and 5 for RC structeres by considering distributions of these parameters to the hight. Reliability indeces for the seismic safety of those models are revealed as between 2 and 3. Design peak ground acceleration is proposed with the appropriate safety degree based on the optimum reliability due to minimum total cost concept. The relation among those results summarized here is also reviewed.

已经考虑了有关Erathquake响应的概率估计的许多方面。首先，通过使用在板界的地震中使用孤立的地震模型，并假设地震地面运动的最大速度的适当上边界提出了改进的地震危害分析。为各种模型开发了用于动态响应的关键输入波的生成方法。对于原始方向的滞后模型，使用了对频率分量的线性相位属性，对于正常的双线性触发模型，使用了具有同样间隔时间间隔的时间历史的大量值。两个对数正态变量的总和的变形函数通过带有建议的参数的对数正态分布近似。通过Monte-Carlo方法检查近似值的准确性，以获取某些检查点。通过微木制测量值认识到，现有建筑物的固有频率较短，而阻尼比的模式要比设计更高的模式较小。高大建筑物的动态特性的参数，即统计检查质量 - 态度比和屈服剪切力系数等。通过考虑将这些参数分布到Hight的分布，通过6个模型来证明代表性的动态模型，RC结构的6个模型进行了证明。这些模型的地震安全性的可靠性在2到3之间被揭示出来。设计峰值地面加速度是根据最低总成本概念所致的最佳可靠性提出了适当的安全性。此处总结的这些结果之间的关系也得到了审查。