论文部分内容阅读
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。
Based on the response surface method, the factors that affect the long-term deformation are taken as the random variables, and the creep effect of the structure is analyzed by the age-adjusted effective modulus method. The central composite design method and the quadratic polynomial non-crossover term fitting response surface model are used to represent the displacement as the display function of each random variable. Based on the forward stepwise regression method, the selection of variables is significantly analyzed. The sensitivity of the input parameters to the output displacement is analyzed using Spearman’s rank correlation coefficient. The results of ANSYS numerical analysis show that the response surface method can be used to analyze and predict the long-term deformation of the structure, solve the problem that the deterministic analysis can only get the response mean value, and the displacement response can represent the confidence level Unacceptable deformation risk to a minimum; this method can be used for analysis and prediction of internal forces and deformation of long-span bridges.