特大跨度混合梁斜拉桥几何控制法参数敏感性

发布时间：2018-08-16 12:16

【摘要】：为研究千米级混合梁斜拉桥边中跨结构力学行为特点及施工控制策略,为后续的参数识别、误差修正及最优控制决策提供研究基础,以主跨926m的鄂东长江公路大桥为依托,基于几何控制法,并充分考虑非线性效应,分析参数变化对成桥线形、内力的影响,并明确了结构响应对参数的敏感程度。研究结果表明:千米级混合梁斜拉桥由于边中跨结构自重、刚度的悬殊,致使边跨索力及应力对参数变化很敏感,中跨则相反,线形最敏感;对主跨需采取几何线形控制为主,边跨则应以索力控制为主的策略;无应力状态量是影响边中跨结构响应的最主要参数;边中跨结构行为及控制手段有别于全钢箱梁斜拉桥。施工实践表明实测值与理论结果吻合很好,且结构受力状况良好。
[Abstract]:In order to study the mechanical behavior characteristics and construction control strategy of middle span structure of cable-stayed bridge with kilometer hybrid beam, and to provide the research foundation for parameter identification, error correction and optimal control decision, the main span of the 926m Edong Yangtze River Highway Bridge is used as the basis. Based on the geometric control method and taking into account the nonlinear effect, the influence of parameter changes on the linear and internal forces of the bridge is analyzed, and the sensitivity of the structural response to the parameters is determined. The results show that the cable force and stress of the side span are sensitive to the change of the parameters due to the deadweight and stiffness of the middle span structure of the cable-stayed bridge with kilometer hybrid beam, while the middle span is the most sensitive to the linear shape, and the main span should be controlled mainly by geometric alignment. The non-stress state is the most important parameter that affects the response of the side-to-middle span structure, and the behavior and control methods of the side-span structure are different from that of the cable-stayed bridge with steel box girder. Construction practice shows that the measured values are in good agreement with the theoretical results, and the structure is in good stress condition.
【作者单位】：西南交通大学土木工程学院;西南交通大学土木工程系;中交第二航务工程局有限公司技术中心;四川南渝高速公路有限公司;
【基金】：国家自然科学基金项目(51178394) 中央高校基本科研业务费专项资金项目(2682013BR015EM)
【分类号】：U445

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