【摘要】 针对斜拉桥施工期的可靠度分析中不存在显式的极限状态函数的问题,提出了一种改进的虚拟中间变量法,在标准正态空间内重构极限状态曲面;在现场调查和室内试验的基础上,分析了混凝土斜拉桥施工期的设计变量的时变规律;结合现有的桥梁施工控制分析程序,提出了混凝土斜拉桥施工期的时变可靠度的计算方法。算例结果表明:改进的虚拟中间变量法具有高效性和精确性,并且可以利用现有的桥梁施工控制计算程序,对于斜拉桥施工期的安全性评价具有重要意义。更多还原

【Abstract】 An modified virtual intervening variable method is introduced to deal with the reliability analysis of cable-stayed bridges and the performance functions of which is implicit.The performance function approximation is implemented in the standard normal space of random variables.The distribution parameters of design variables are investigated.Combined with the construction process analysis program for bridges,an efficient algorithm is proposed to calculate the time-variant reliability index of cable-stayed bridge during construction.The efficiency and accuracy of the proposed algorithm are demonstrated by several examples.更多还原