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公路规则桥梁实用概率地震需求模型

DOI: 10.13197/j.eeev.2014.02.64.zhuowd.009, PP. 64-70

Keywords: 规则桥梁,基于概率和性能的抗震设计,概率地震需求模型,增量动力分析,墩顶漂移率

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Abstract:

概率地震需求模型是实现工程结构基于概率和性能的抗震设计至关重要的一环。针对公路桥梁中的规则桥梁,选择三类不同场地共2390条地震动记录,采用增量动力分析方法,计算了8座具有代表性的规则桥梁样本的地震需求。选择阻尼比为5%、与结构基本周期对应的谱加速度作为地震动强度指标,分别选择墩顶漂移率、位移延性系数和标准化滞回能量等参数作为工程需求参数,考察了各工程需求参数在不同地震动强度水平下的概率分布特征;结果表明,在不同的地震动强度水平下,各工程需求参数均很好地服从对数正态分布。以墩顶漂移率为工程需求参数,通过回归分析,建立了规则桥梁实用的概率地震需求模型;该模型同时适用于三类场地,可大大简化规则桥梁基于概率和性能的抗震设计中的需求计算。

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