Effect of the angle of seismic incidence on the fragility curves of bridges

脆弱性 峰值地面加速度 地震灾害 地震学 结构工程 地质学 增量动力分析 桥(图论) 加速度 地震波 地震动 工程类 物理 内科学 热力学 经典力学 医学
作者
Marco Torbol,Masanobu Shinozuka
出处
期刊:Earthquake Engineering & Structural Dynamics [Wiley]
卷期号:41 (14): 2111-2124 被引量:43
标识
DOI:10.1002/eqe.2197
摘要

SUMMARY This study examines the effect of the angle of seismic incidence θ on the fragility curves of bridges. Although currently, fragility curves of bridges are usually expressed only as a function of intensity measure of ground motion ( IM ) such as peak ground acceleration, peak ground velocity, or S a ( ω 1 ), in this study they are expressed as a function of IM with θ as a parameter. Lognormal distribution function is used for this purpose with fragility parameters, median c m and standard deviation ζ to be estimated for each value of θ chosen from 0 < θ < 360°. A nonlinear 3D finite element dynamic analysis is performed, and key response values are calculated as demand on the bridge under a set of acceleration time histories with different IM values representing the seismic hazard in Los Angeles area. This method is applied to typical straight reinforced concrete bridges located in California. The results are validated with existing empirical damage data from the 1994 Northridge earthquake. Even though the sample bridges are regular and symmetric with respect to the longitudinal axis, the results indicate that the weakest direction is neither longitudinal nor transverse. Therefore, if the angle of seismic incidence is not considered, the damageability of a bridge can be underestimated depending on the incidence angle of seismic wave. Because a regional highway transportation network is composed of hundreds or even thousands of bridges, its vulnerability can also be underestimated. Hence, it is prudent to use fragility curves taking the incident angle of seismic waves into consideration as developed here when the seismic performance of a highway network is to be analyzed. Copyright © 2012 John Wiley & Sons, Ltd.
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