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首页> 外文期刊>Bulletin of Earthquake Engineering >Probabilistic seismic demand model for curved reinforced concrete bridges
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Probabilistic seismic demand model for curved reinforced concrete bridges

机译：曲线钢筋混凝土桥梁的概率地震需求模型

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摘要

This article examines the seismic behaviour of curved box-girder concrete highway overpass bridges commonly built in California. In particular, a probabilistic seismic demand model for curved 5-span reinforced concrete box-girder bridges with single circular column bents is developed. The principal parameter of the demand model is the bridge curve radius in the horizontal plane, varying from infinity (representing a straight bridge) to a sharp curve radius equal to the length of the bridge. Three bridge prototypes are analyzed: (1) a tall-column bridge with relatively low lateral stiffness; (2) a bridge commonly designed in California and (3) a short-column bridge with high lateral stiffness. A probabilistic seismic demand analysis, including a modal analysis and an evaluation of the nonlinear static and dynamic response, are performed for each bridge prototype and each radius value. The magnitude-distance bin approach is used to cover a range of plausible ground motion scenarios. The probabilistic demand models are cast in terms of one engineering demand parameter, the bridge drift ratio, and two intensity measures: the peak ground displacement or velocity, and the spectral displacement at the fundamental period of the bridge, S d (T 1). The demand models show an increase in transverse-direction drift ratio demand for sharply curved bridges.
机译：本文研究了加利福尼亚州通常建造的曲线箱梁混凝土公路立交桥的抗震性能。特别是，建立了具有单圆柱弯头的曲线五跨钢筋混凝土箱梁桥的概率地震需求模型。需求模型的主要参数是水平面中的桥曲线半径，范围从无穷大（代表直桥）到等于桥长度的锐曲线半径。分析了三种桥梁原型：（1）高侧向刚度较低的高柱桥梁； （2）加利福尼亚州通常设计的桥梁，以及（3）具有高侧向刚度的短柱桥梁。对每个桥梁原型和每个半径值进行概率地震需求分析，包括模态分析和非线性静动态响应的评估。量距距离箱方法用于覆盖一系列可能的地面运动场景。概率需求模型是根据一个工程需求参数，桥梁漂移率和两个强度度量来转换的：地面峰值位移或速度，以及桥梁基本周期的频谱位移S d （T 1 ）。需求模型显示，对于急剧弯曲的桥梁，横向漂移率需求增加。

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