基于EC法的风浪联合作用主塔-基础体系极限荷载效应
发布时间：2018-11-20 07:24
【摘要】：针对基于Rosenblatt映射变换的极限状态曲线计算困难的现状,提出了多维随机变量极限状态曲线的简化算法。该算法通过寻找同时满足边缘分布、联合分布和可靠指标的变量估计值,将随机变量条件分布函数及其逆函数的求解转化为边缘分布函数的求逆,从而达到简化极限状态曲线计算的目的。以某跨海大桥桥塔-基础体系为工程实例,以涠洲岛海洋站风浪同步观测资料为环境变量统计资料,通过基于Copula函数的联合分布模型构造了风浪联合分布函数,根据简化算法计算了风浪极限状态曲线,利用EC法估计了桥塔-基础体系的基底剪力极限荷载效应,并与外推法的估计结果进行了比较。结果表明,基于简化算法和EC法的跨海大桥桥塔-基础体系基底剪力极限荷载效应具有较高的准确性。
[Abstract]:In view of the difficulty of calculating limit state curve based on Rosenblatt mapping transformation, a simplified algorithm of limit state curve for multidimensional random variables is proposed. The algorithm transforms the conditional distribution function of random variables and its inverse function into the inverse of the edge distribution function by searching for the estimators of variables which satisfy the edge distribution, the joint distribution and the reliability index at the same time. In order to simplify the calculation of limit state curve. Taking the bridge tower foundation system of a sea crossing bridge as an engineering example, taking the wind and wave synchronous observation data of Weizhou Island Ocean Station as the environmental variable statistics data, the wind wave joint distribution function is constructed through the joint distribution model based on Copula function. According to the simplified algorithm, the wind wave limit state curve is calculated, and the ultimate load effect of the bridge tower-foundation system is estimated by using EC method, and the results are compared with those of the extrapolation method. The results show that the ultimate shear load effect of the tower and foundation system of cross-sea bridge based on simplified algorithm and EC method is accurate.
【作者单位】： 浙江大学建筑工程学院结构工程研究所;
【基金】：交通运输部科技项目(2011318223170) 国家自然科学基金资助项目(51578504)
【分类号】：TU470
[Abstract]:In view of the difficulty of calculating limit state curve based on Rosenblatt mapping transformation, a simplified algorithm of limit state curve for multidimensional random variables is proposed. The algorithm transforms the conditional distribution function of random variables and its inverse function into the inverse of the edge distribution function by searching for the estimators of variables which satisfy the edge distribution, the joint distribution and the reliability index at the same time. In order to simplify the calculation of limit state curve. Taking the bridge tower foundation system of a sea crossing bridge as an engineering example, taking the wind and wave synchronous observation data of Weizhou Island Ocean Station as the environmental variable statistics data, the wind wave joint distribution function is constructed through the joint distribution model based on Copula function. According to the simplified algorithm, the wind wave limit state curve is calculated, and the ultimate load effect of the bridge tower-foundation system is estimated by using EC method, and the results are compared with those of the extrapolation method. The results show that the ultimate shear load effect of the tower and foundation system of cross-sea bridge based on simplified algorithm and EC method is accurate.
【作者单位】： 浙江大学建筑工程学院结构工程研究所;
【基金】：交通运输部科技项目(2011318223170) 国家自然科学基金资助项目(51578504)
【分类号】：TU470
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