自锚式吊拉协作体系桥动力特性随机分析  

Stochastic Dynamic Analysis of Self-anchored Cable-stayed Suspension Bridge

作　　者：叶毅[1] 张哲[2] 赵佳[1] 郭琦[1] 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]大连理工大学建设工程学部,辽宁大连116023

出　　处：《公路交通科技》2011年第11期85-89,99,共6页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51108372);交通部西部交通建设科技项目(200631882350);陕西省重点学科建设专项资金项目(E01004);陕西省教育厅专项科研项目(11JK0962);西安建筑科技大学校人才科技基金项目(RC 1028);西安建筑科技大学青年科技基金项目(QN1116)

摘　　要：为了研究复杂结构体系中不确定性结构参数对其动力特性的影响,采用响应面法,选择出若干个对因变量影响较大的随机变量参与响应面拟合。采用该方法对大连湾自锚式吊拉协作体系桥动力特性进行了敏感因子分析。计算分析表明,自锚式吊拉协作体系桥主梁质量密度的随机性对其动力特性最为敏感,同时缆索体系和主梁结构参数的随机性对斜拉桥低阶模态的敏感性较强。所做工作能为自锚式吊拉协作体系桥结构受力分析提供参考,同时为复杂结构体系不确定性参数的随机分析提供相应的思路。In order to study the influence of uncertainty parameters of complex structure on its dynamic characteristics,the random variables that have significant impact on the dependent variables were selected to fit response surface by adopting response surface method.Based on the above mentioned method,the sensitive factors of dynamic characteristics of a self-anchored cable-stayed suspension bridge in Dalian Bay were analyzed.The result shows that the randomness of girder mass density of the self-anchored cable-stayed suspension bridge is the most sensitive factor to its dynamic characteristics,while the randomness of the cable system and main girder parameters are sensitive to the low order modes of cable-stayed bridge.The research can provide a reference for structure analysis of self-anchored cable-stayed suspension bridge and give a corresponding idea for stochastic analysis of uncertain parameters for complex structures.

关 键 词：桥梁工程 自锚式吊拉协作体系桥 响应面法 动力特性 随机性 敏感性 

分 类 号：U448.216.1[建筑科学—桥梁与隧道工程]