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Engineering demand functions for RC medium length span bridges

机译：RC中长跨桥的工程需求函数

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The evolution of the seismic design philosophies and the strong correlation of some structural demands with damage, motivate the research community to improve the knowledge about the pier demands in bridges. The seismic demands can be determined by conducting non-linear time history analyses, however, the computational time required can be excessive and the outcome are usually limited to the type of bridge studied and to the ensemble of records applied. Recently, several studies have proposed analytical expressions to assess Engineering Demand Parameters (EDP's) as a function of intensity measures (IM's). The objective of this research is twofold: to determine IM-EDP functions for typical highway RC bridges, and to quantify the influence on the bridge EDP's by considering the seismic data of two important seismic sources jointly or separately. For this purpose, the response of a family of bridge models located in four different seismic zones was analyzed. The bridges were subjected to 124 seismic records from earthquakes with origin on the two most important seismic sources in Mexico, namely: subduction fault and deeper inslab fault. The IM selected to establish the relationships, was the spectral acceleration for the fundamental period of the bridge and the EDP's were the pier Park and Ang damage index and the pier drift ratio. The proposed expressions are based on the 7,936 nonlinear time history analyses conducted in both directions of the bridge models.
机译：抗震设计理念的发展以及某些结构要求与破坏之间的紧密联系，促使研究界提高了对桥梁墩要求的认识。可以通过进行非线性时程分析来确定地震需求，但是，所需的计算时间可能会过多，并且结果通常限于所研究桥梁的类型和所应用记录的整体。近来，一些研究提出了分析表达式，以根据强度度量（IM）评估工程需求参数（EDP）。这项研究的目的是双重的：确定典型公路RC桥梁的IM-EDP功能，并通过共同或分别考虑两个重要地震源的地震数据来量化对桥梁EDP的影响。为此，分析了位于四个不同地震带中的一系列桥梁模型的响应。这些桥梁受到了来自地震的124条地震记录，这些地震的起源是墨西哥的两个最重要的地震源：俯冲断层和较深的板状断层。选择用于建立关系的IM是桥梁基本周期的频谱加速度，而EDP则是码头Park和Ang破坏指数以及码头漂移率。所提出的表达式基于在桥梁模型的两个方向上进行的7,936个非线性时程分析。

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