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.

地震反应概率估计的许多方面都已被考虑。首先，通过使用板块边界上发生的地震的孤立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险性分析。针对各种类型的模型开发了动态响应临界输入波的生成方法。对于面向原点的磁滞模型，使用频率分量的线性相位特性，对于正常的双线性磁滞模型，使用导致具有相等间隔的时间间隔的时间历史的大值的相位特性。两个对数正态变量之和的分布函数通过具有建议参数的对数正态分布来近似。对于某些检查点，通过蒙特卡罗方法检查近似的准确性。通过微震测量可以看出，与设计中使用的相比，现有建筑物的固有频率更短，并且更高模式的阻尼比更小。对高层建筑的质量刚度比、屈服剪力系数等动力特性参数进行了统计检验。通过考虑这些参数到高度的分布，通过 6 个 S 结构模型和 5 个 RC 结构模型演示了代表性动态模型。这些模型的地震安全性的可靠性指数在 2 和 3 之间。基于最小总成本概念的最佳可靠性，提出了具有适当安全度的设计峰值地面加速度。还回顾了此处总结的这些结果之间的关系。