斜拉桥施工阶段标高控制模糊随机可靠度分析  

Analysis of Fuzzy Random Reliability of Elevation Control of Cable-Stayed Bridge at Construction Stage

作　　者：余晓琳[1] 杨勇[2] 贾布裕[1] 颜全胜[1] 

机构地区：[1]华南理工大学土木与交通学院,广东广州510640 [2]广州市市政工程设计研究院,广东广州510060

出　　处：《桥梁建设》2014年第5期112-117,共6页Bridge Construction

基　　金：国家自然科学基金项目(51208208);中国博士后科学基金项目(2013M542174);中央高校基本科研业务费专项资金资助项目(2014ZZ0019;2013ZB0004)~~

摘　　要：由于桥梁施工阶段标高控制过程中存在随机性和强烈模糊性的问题,为取得更好的标高控制效果,采用随机有限元法求解桥梁结构响应梯度,结合模糊隶属函数向随机密度函数作等价变换,得到标高控制模糊随机可靠度。以九江重建斜拉桥为背景,对随机变量参数进行敏感度分析,计算该桥的标高控制模糊随机可靠度,并分析与此相关的多种影响因素。结果表明,钢主梁容重、斜拉索弹性模量等是敏感度较大的随机变量;考虑标高控制失效模糊随机性,通过隶属函数将失效区域定义在某个区间得到的结果更具实用性;适当提高控制成功界限值,选择最优的标高控制失败界限值,可较好地提高施工阶段标高控制成功率。The problems of randomness and strong fuzziness exist in the process of elevation control of cable-stayed bridge at construction stage. To achieve better effect of the elevation control, the random finite element method was used to solve the structural response gradients of the bridge and by the method of equivalently transforming the fuzzy membership functions to the random density functions, the fuzzy random reliability of the elevation control was obtained. The Jiujiang Reconstructed Cable-Stayed Bridge was cited as an example, the sensitivity analysis of the random variable parameters of the bridge was implemented, the fuzzy random reliability of the elevation control was calculated and a number of the influential factors related to the random reliability were analyzed. The results of the analysis suggest that the volume weight of the steel main girder and the elasticity modulus of the stay cables are the random variables of great sensitivity. The results obtained from the methodof defining the failure zone in a certain space interval by considering the randomness and fuzziness of the elevation control failure and by using the mem- bership functions are more practical. The proper increase of the boundary value of the elevation control success and the choice of the optimal boundary value of the elevation control failure can better achieve the success rate of the elevation control of the cable-stayed bridge at construction stage.

关 键 词：斜拉桥 施工阶段 标高控制 模糊随机可靠度 随机变量 变异系数 可靠度分析 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] TB114.3[交通运输工程—道路与铁道工程]