大跨度混合梁斜拉桥施工期结构力学行为研究  

Research on Structural Mechanics Behavior of Long-span Hybrid Beam Cable-stayed Bridge during Construction

作　　者：唐涛[1] Tang Tao(NO.1 Engineering Company of China Railway No.8 Engineering Group Co.,Ltd.,Chongqing 400000,China)

机构地区：[1]中国中铁八局集团第一工程有限公司,重庆市400000

出　　处：《北方交通》2023年第8期18-21,25,共5页Northern Communications

摘　　要：超大跨度混合梁斜拉桥结构体系及施工工序较为复杂。以国内某主跨926m混合梁斜拉桥为背景,研究超大跨度混合梁斜拉桥施工期结构力学行为特点,发现超大跨度混合梁斜拉桥结构力学行为与全钢斜拉桥差异较大,边、中跨结构行为具有一定的独立性。边跨内力及索力为施工控制重点,中跨线形是控制的主要因素。研究结果表明,施工期桥墩受力虽复杂,但整个施工过程中边墩始终受压,超大跨度混合梁斜拉桥边跨自重、刚度大的优点得到充分体现。研究成果可为超大跨度混合梁斜拉桥建设提供参考。The structural system and construction process of a super-long-span hybrid beam cable-stayed bridge are relatively complex.Taking a domestic 926m main span hybrid beam cable-stayed bridge as the background,the structural mechanics behavior characteristics of the super-long-span hybrid beam cable-stayed bridge during the construction are studied.It is found that the structural mechanics behavior of the super-long-span hybrid beam cable-stayed bridge is quite different from that of the all-steel cable-stayed bridge,and the side and middle span structural behaviors are somewhat independent.The internal force and cable force of the side span are the key points for construction control,while the alignment of the middle span is the main factor for control.The research results show that,although the stress on the bridge piers during the construction is complex,the side piers are always under pressure throughout the entire construction process.The advantages of large self weight and high stiffness of the side span of the super-large-span hybrid beam cable-stayed bridge are fully reflected.The research results can provide reference for the construction of the super-long-span hybrid beam cable-stayed bridge.

关 键 词：超大跨度 混合梁斜拉桥 施工期 结构力学行为 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]