权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

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.

对地震反应的概率估计考虑了许多方面。首先提出了一种改进的地震危险性分析方法，该方法采用了一种发生在板块边界上的孤立地震模型，并假定了地震地面运动最大速度的适当上界。针对不同类型的模型，提出了动力响应临界输入波的生成方法。对于原始取向的滞后模型，使用相对于频率分量的线性相位属性，并且对于正常的双线性滞后模型，使用导致具有相同间隔时间间隔的时间历史的大值的相位属性。两个对数正态变量之和的分布函数用对数正态分布来近似，并给出了参数。用蒙特卡罗方法对一些校验点的近似精度进行了检验。微观量测表明，与设计时相比，既有建筑的固有频率较短，高阶振型的阻尼比较小。对影响高层建筑动力特性的质量-刚度比、屈服剪力系数等参数进行了统计检验。考虑这些参数在高度上的分布，以S结构的6个模型和钢筋混凝土结构的5个模型为例，验证了具有代表性的动力模型。这些模型的地震安全性可靠度指标在2~3之间。根据总费用最小的概念，提出了基于最优可靠度的设计峰值地震动加速度。文中还对这些结果之间的关系进行了评述。