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基于响应面法的桥梁结构徐变效应分析

, PP. 78-82

Keywords: 桥梁工程,徐变效应,响应面法,变形预测,显著性检验,灵敏度分析

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Abstract:

?基于响应面法,将影响长期变形的因素作为随机变量,采用按龄期调整的有效模量法对结构的徐变效应进行分析。采取中心复合设计法和不含交叉项的二次多项式形式拟合响应面模型,将位移表达成各随机变量的显示函数;基于向前逐步回归的方法对变量的选取进行了显著性分析,并采用斯皮尔曼等级相关系数分析了输入参数对输出位移的敏感性。以ANSYS为分析平台的数值算例计算结果表明:利用响应面法,可实现结构长期变形的分析及预测,解决确定性分析只能得到响应均值的问题,代表一定置信水平的结构位移响应可把不可接受的变形风险降到最低;该方法可用于大跨度桥梁内力和变形的分析与预测。

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