Response Spectrum Analysis of Bridges Subjected to Differential Support Motions Based on Loma Prieta EarthquakeData

这是一个事后调查项目， 从洛马普列塔地震（10月）中吸取的工程经验教训 一九八九年） 洛马普列塔地震数据将用于开发新的 桥梁及其它结构分析的反应谱法 多层支撑结构， 差异地面运动 频率相关 模型的支持运动的海湾大桥，会计 行波的影响，衰减，传播 道路，以及当地的土壤和地质结构将 构造和校准。 此函数将应用于 反应谱分析法基于 随机过程 将采用新的反应谱法进行研究 海湾大桥在洛马普列塔地震中的反应 地震，并确定其失败的原因。 将特别强调确定影响 对所观察到的性能的差异支撑运动 在桥上。 分析结果将进行比较 与计划的时间历史分析的桥梁，由一个单独的 伯克利分校的研究小组，从而验证了响应 光谱法 然后，该方法将用于预测 坝桥在大震作用下的反应 圣安德烈亚斯或海沃德断层的震级。 这部分将 与其他计划中的研究同时进行。 位于伯克利的加州大学的海湾大桥。 研究将推进分析的方法论 桥梁对多点地震激励的响应。

This is a post-event investigation project to learn engineering lessons from the Loma Prieta earthquake (October 1989) The Loma Prieta earthquake data will be used to develop a new response spectrum method for analysis of bridges and other multyply supported structures that are subjected to differential ground motion. A frequency dependent correlation model for the support motions of the Bay Bridge, accounting for the effects of traveling waves, attenuation, propogation path, and local soil and geologic structures will be constructed and calibrated. This function will be applied to the response spectrum analysis based on the principles of stochastic processes. The new response spectrum method will be used to investigate the response of the Bay Bridge during the Loma Prieta earthquake and to determine the causes of its failure. Special emphasis will be given to determining the influence of differential support motions on the observed performance of the bridge. The results from this anlysis will be compared with planned time-history analysis of the bridge by a separate research team at Berkeley, thus verifying the response spectrum method. The method will then be used to predict the response of the Ba Bridge to a potential earthquake of large magnitude on San Andreas or Hayward faults. This part will be carried out in parallel with other planned studies of the Bay Bridge at the Universit of California at Berkeley. The investigation will advance the methodology for analyzing the bridge response to multiple-support seismic excitations.