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-  2016 

流速空间相关性对洪水作用下简支梁桥可靠度的影响 Reliability analysis of the effect of flood on the bridge considering spatial correlation of velocity

Keywords: 简支梁桥,洪水,Karhunen-Loeve展开法,流速空间相关性,可靠度

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Abstract:

对一个两跨简支梁桥进行洪水作用下可靠性分析,将洪水流速视为随机场,基于模型试验分析了流速沿桥梁跨度方向的空间相关性,采用K-L展开法模拟流速随机场,研究了沿桥梁跨度方向流速空间相关性对洪水作用下桥梁可靠性的影响.结果表明:随着距离的增大,流速沿桥梁跨度方向的空间相关性减弱;可靠指标随着流速、相对淹没深度的增大而减小,当相对淹没深度趋于2.5时,可靠指标趋于恒定;流速空间相关性对可靠指标的影响显著,随着相关距离增大,可靠指标减小,并逐渐趋于常数

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