ABSTRACT

This paper presents an application of the Conditional Mean Spectrum (CMS) methodology for sourcing accelerogram records for use in dynamic analyses of structures in intraplate regions of lower seismicity. The main challenges with deriving CMS for selecting and scaling accelerograms in regions of lower seismicity stem from the paucity of representative strong motion data and event recurrence data. A step-by-step illustration of the methodology is presented using the south-eastern Australia (SEA) region as an example. The study involves making use of a diversity of Ground Motion Prediction Expressions (GMPEs) including a recently developed regionally adjustable Component Attenuation Model (CAM). Three different schemes using a weighted averaging of candidate GMPEs were adopted and a comparison of predictions demonstrated only minor differences confirming the robustness of the modelling. The CMS constructed in this study have been used to develop a proposed suite of scaled accelerograms for SEA.

摘要

本文介绍了条件平均谱 (CMS) 方法的应用，用于获取加速度记录，用于对地震活动性较低的板内区域的结构进行动态分析。导出 CMS 以在地震活动性较低的地区选择和缩放加速度图的主要挑战源于缺乏代表性的强运动数据和事件重现数据。以澳大利亚东南部 (SEA) 地区为例，逐步说明该方法。该研究涉及利用多种地面运动预测表达式 (GMPE)，包括最近开发的区域可调分量衰减模型 (CAM)。采用了三种使用候选 GMPE 加权平均的不同方案，并且预测的比较表明只有微小的差异证实了建模的稳健性。本研究中构建的 CMS 已被用于开发一套用于 SEA 的缩放加速度图。