缆索协作体系桥梁静力特性研究
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摘要
缆索协作体系是一种融合了悬索桥和斜拉桥优点的新型缆索承重桥梁结构,为研究此类桥梁结构的主要静力特性,指导设计,以某主跨1 700m双层缆索协作体系桥梁方案(主跨跨中1218m为悬吊部分,其余为斜拉部分)为背景,采用桥梁非线性分析程序BNLAS对桥梁主要结构进行计算分析。结果表明:缆索协作体系与常规悬索桥相比具有较大的竖向刚度,采用钢混接头断开方案,可释放钢混接头处的较大内力,过渡段悬索部分加劲梁会产生纵向相对位移和梁端转角,可考虑设置纵向拉杆作为限位装置;通过在边跨设置辅助墩、采用混凝土主梁及塔梁固结等措施增加结构刚度,可适当改善长拉索及端吊索的疲劳问题;缆索协作体系与相同跨度的悬索桥相比,主缆截面有所减少;悬索-斜拉组合体系交汇处吊索可采用刚性吊杆。
The combined suspension and cable-stayed system is a type of bridge structure inheriting the advantages of both the suspension bridge and the cable-stayed bridge,in which the suspension system and the cable-stayed system are coordinated to bear loads.The scheme of a double-deck combined suspension and cable-stayed bridge with a main span of 1700 mwas taken as the background to study the major static properties of the bridge structure of such type and guide the design.The suspension part occupies a length of 1218 m,and the remaining is the cable-stayed part.The BNLAS,a bridge non-linear analytical program,was used to carry out structural calculation and analysis.The results show that the combined suspension and cable-stayed system has greater vertical stiffness,compared with the conventional suspension bridge.The scheme of disengaging the steel-concrete joints can release the relatively big internal force at the locations of the steel-concrete joints.Since longitudinal relative displacement and girder-end angular rotation will occur in the stiffening girder in the suspension part of the transition section,it is possible to consider installing longitudinal tension rods as the restricted devices.In order to improve the fatigue condition of the long stay cables and the end hanger cables,a series of measures were taken,including installing auxiliary piers in the side spans and adopting the concrete main girder and the pylongirder fixed system.Compared with the suspension bridge with the same span length,the main cable cross section of the combined suspension and cable-stayed system is minimized to a certain extent.The hanger cables at the junction of the suspension system and the cable-stayed system can use the rigid hangers.
The combined suspension and cable-stayed system is a type of bridge structure inheriting the advantages of both the suspension bridge and the cable-stayed bridge,in which the suspension system and the cable-stayed system are coordinated to bear loads.The scheme of a double-deck combined suspension and cable-stayed bridge with a main span of 1700 mwas taken as the background to study the major static properties of the bridge structure of such type and guide the design.The suspension part occupies a length of 1218 m,and the remaining is the cable-stayed part.The BNLAS,a bridge non-linear analytical program,was used to carry out structural calculation and analysis.The results show that the combined suspension and cable-stayed system has greater vertical stiffness,compared with the conventional suspension bridge.The scheme of disengaging the steel-concrete joints can release the relatively big internal force at the locations of the steel-concrete joints.Since longitudinal relative displacement and girder-end angular rotation will occur in the stiffening girder in the suspension part of the transition section,it is possible to consider installing longitudinal tension rods as the restricted devices.In order to improve the fatigue condition of the long stay cables and the end hanger cables,a series of measures were taken,including installing auxiliary piers in the side spans and adopting the concrete main girder and the pylongirder fixed system.Compared with the suspension bridge with the same span length,the main cable cross section of the combined suspension and cable-stayed system is minimized to a certain extent.The hanger cables at the junction of the suspension system and the cable-stayed system can use the rigid hangers.
引文
[1]杨进.悬吊斜拉组合桥结构应用于武汉市杨泗长江大桥的技术经济优势分析[J].桥梁建设,2010(5):1-2.
[2]张新军,姚美.大跨度部分地锚式斜拉桥抗风稳定性参数研究[J].桥梁建设,2016,46(3):23-28.
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[4]董传洲,黄辉.土耳其博斯普鲁斯海峡三桥投标施工方案设计[J].世界桥梁,2013,41(1):9-12.
[5]王晓明,雷晓鸣,王成树,等.自锚式悬索-斜拉桥吊装施工方法及其性能分析[J].桥梁建设,2016,46(4):114-119.
[6]周隆文,冯彩霞,曾诗琪,等.斜拉-悬索协作体系桥主缆找形的假定初态法[J].工程与建设,2017,31(1):27-29.
[7]雷俊卿,曹珊珊,林道锦.多塔斜拉桥钢箱梁中设置刚性铰研究[J].桥梁建设,2016,46(1):53-58.
[8]马振栋,卢光明,黄刚.高低塔固结体系斜拉桥结构优化设计方法[J].世界桥梁,2015,43(4):1-5.
[9]杨庸,雷俊卿.三塔斜拉桥设计参数分析[J].世界桥梁,2015,43(4):53-57.
[10]王忠彬.张家界大峡谷玻璃桥缆索系统设计[J].桥梁建设,2017,47(3):83-87.
[2]张新军,姚美.大跨度部分地锚式斜拉桥抗风稳定性参数研究[J].桥梁建设,2016,46(3):23-28.
[3]周云岗,杨靖华.多塔斜拉-悬吊协作体桥力学性能探讨[J].燕山大学学报,2015,39(1):88-94.
[4]董传洲,黄辉.土耳其博斯普鲁斯海峡三桥投标施工方案设计[J].世界桥梁,2013,41(1):9-12.
[5]王晓明,雷晓鸣,王成树,等.自锚式悬索-斜拉桥吊装施工方法及其性能分析[J].桥梁建设,2016,46(4):114-119.
[6]周隆文,冯彩霞,曾诗琪,等.斜拉-悬索协作体系桥主缆找形的假定初态法[J].工程与建设,2017,31(1):27-29.
[7]雷俊卿,曹珊珊,林道锦.多塔斜拉桥钢箱梁中设置刚性铰研究[J].桥梁建设,2016,46(1):53-58.
[8]马振栋,卢光明,黄刚.高低塔固结体系斜拉桥结构优化设计方法[J].世界桥梁,2015,43(4):1-5.
[9]杨庸,雷俊卿.三塔斜拉桥设计参数分析[J].世界桥梁,2015,43(4):53-57.
[10]王忠彬.张家界大峡谷玻璃桥缆索系统设计[J].桥梁建设,2017,47(3):83-87.
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