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首页> 外文期刊>International Journal Of Modelling & Simulation >INVERSE-FORM MODELLING FOR INITIAL SEISMIC RETROFIT DESIGN
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INVERSE-FORM MODELLING FOR INITIAL SEISMIC RETROFIT DESIGN

机译：初始地震反演设计的逆形式建模

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The concept of performance-based seismic design (PBSD) has been explored by researchers for over a decade and the implementation stage is at the cusp of beginning. One important aspect of this early implementation stage is to examine existing analysis and design concepts that can serve as linkages to help improve and speed up implementation by integrating directly into the PBSD philosophy. To date, structural reliability has served as the cornerstone for load and resistance factor design (LRFD) code calibration and to some extent it could provide for some level of PBSD code calibration. This paper presents a summary of the results of a numerical study to examine the application of the inverse first order reliability method (I-FORM) for preliminary design of a base isolation system within the context of PBSD. In other words, it is given that a target structural reliability level is required for a particular structure, how does one select the properties (i.e., design) of the base isolation system to ensure the desired reliability level to all possible earthquakes? This is accomplished herein by decoupling the earthquake demand from the structural concept using a method known as the environmental contour procedure which is essentially I-FORM. The earthquake is described in terms of magnitude, site-to-source distance, and an uncertainty parameter that lumps both aleatory and epistemic uncertainties using readily available earthquake data. A ground motion attenuation function provides the link between the earthquake demand description and the structural concept in the form of spectral acceleration as a function of natural period. An illustrative example for a hypothetical building located in Los Angeles, CA having a fundamental period of vibration of 0.4s prior to retrofit is presented. In this example, the stiffness of a laminated rubber bearing isolation system is the design variable of interest.
机译：基于性能的抗震设计（PBSD）的概念已经被研究人员探索了十多年，并且实施阶段才刚刚开始。此早期实施阶段的一个重要方面是研究现有的分析和设计概念，这些概念和设计概念可以作为链接，通过直接集成到PBSD哲学中来帮助改进和加快实施。迄今为止，结构可靠性已成为负载和阻力因子设计（LRFD）代码校准的基石，并且在某种程度上可以为PBSD代码校准提供一定水平。本文介绍了数值研究的结果，以检查反一阶可靠性方法（I-FORM）在PBSD范围内对基础隔离系统的初步设计中的应用。换句话说，假定对于特定结构要求目标结构可靠性等级，那么如何选择基础隔离​​系统的特性（即设计）以确保对所有可能的地震具有所需的可靠性等级？在这里，这是通过使用一种称为环境轮廓过程的方法将地震需求与结构概念去耦来实现的，该方法基本上是I-FORM。地震是根据震级，站点到源的距离以及不确定性参数来描述的，该不确定性参数使用容易获得的地震数据将偶然不确定性和认知不确定性混为一谈。地震动衰减函数提供了地震需求描述与结构概念之间的联系，并以频谱加速度的形式作为自然周期的函数。给出了一个位于加利福尼亚州洛杉矶的假设建筑物的说明性示例，该建筑物在翻新前的基本振动周期为0.4s。在此示例中，层压橡胶轴承隔离系统的刚度是关注的设计变量。

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