单索面曲梁人行悬索桥静动力特性分析
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摘要
单索面曲梁悬索桥属于新型结构体系,其复杂的结构性能研究尚处于初步阶段。本文基于Midas/Civil建立了一双塔单索面外侧悬吊曲线梁桥成桥状态模型,通过对其结构的静动力特性和舒适度分析,研究这种新型结构体系的力学性能和人行舒适度问题。主要结果为:偏载布置下主缆变形在主梁变形中起主导作用,呈现悬索结构的特征;半跨径满载工况控制主梁弯矩及扭矩包络图的形状及极值;中跨主缆索力数值远大边缆,主塔承担较大不平衡力;主塔吊索索力产生突变,呈现斜拉桥拉索特征,其余吊索呈现一般悬索吊索特征。单索面曲梁悬索桥结构展示了复杂的悬索、曲梁及拉吊的组合特征,在特定荷载工况下某一结构特征比较凸显,且结构轻柔的特征易导致特定人流密度下舒适度的问题,应该引起高度重视。
The curved suspension bridge with only single cable plane is such a new structural system that the complex mechanical properties problems are still under research. Based on a finite element model in finishing state established with Midas/Civil software, through the analysis of the static and dynamic characteristics and comfort of the structure, the mechanical properties and pedestrian comfort of one two-tower curved suspension bridge with single cable plane are studied. The conclusions are as follows: the deflection of the main cable plays a leading role in the deflection of the main girder under eccentric loading, showing the characteristics of the cable structure. The envelopes of bending moment and torque of the girder and the corresponding maximum and minimum values are determined by the half span full load condition. The main tower bears large unbalanced forces due to the main cable force difference between the central span and the side span. The stay cable and the hangers exhibit different functions such as there are an abrupt increase tension in the stay cable and the tension in hangers show the behavior as in the suspension bridge. The structure shows complex characteristics of suspension cables, curved beams and stay cables. Under certain load conditions, a certain structural feature is more prominent, and the characteristics of flexible structure can easily lead to the problem of comfort under specific pedestrian density, which should be highly valued.
The curved suspension bridge with only single cable plane is such a new structural system that the complex mechanical properties problems are still under research. Based on a finite element model in finishing state established with Midas/Civil software, through the analysis of the static and dynamic characteristics and comfort of the structure, the mechanical properties and pedestrian comfort of one two-tower curved suspension bridge with single cable plane are studied. The conclusions are as follows: the deflection of the main cable plays a leading role in the deflection of the main girder under eccentric loading, showing the characteristics of the cable structure. The envelopes of bending moment and torque of the girder and the corresponding maximum and minimum values are determined by the half span full load condition. The main tower bears large unbalanced forces due to the main cable force difference between the central span and the side span. The stay cable and the hangers exhibit different functions such as there are an abrupt increase tension in the stay cable and the tension in hangers show the behavior as in the suspension bridge. The structure shows complex characteristics of suspension cables, curved beams and stay cables. Under certain load conditions, a certain structural feature is more prominent, and the characteristics of flexible structure can easily lead to the problem of comfort under specific pedestrian density, which should be highly valued.
引文
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[21]阳治群.大跨异型玻璃悬索人行桥侧向振动临界人数估计[J].公路工程,2017,42(3):269-273.Yang Z Q.Estimation of critical number of lateral vibration of long-span shaped glass suspension footbridge[J].Highway Engineering,2017,42(3):269-273.
[22]王浩,刘海红,陶天友,等.TMD对列车作用下大跨钢桁架桥的振动控制研究[J].振动工程学报,2014,27(3):385-391.Wang H,Liu H H,Tao T Y,et al.Study on the vibration control of large span steel truss bridge under the action of TMD train[J].Journal of Vibration Engineering,2014,27(3):385-391.
[23]陈鑫,李爱群,张志强,等.自立式高耸结构悬吊式TMD减振动力试验与分析[J].振动工程学报,2016,29(2):193-200.Chen X,Li A Q,Zhang Z Q,et al.Test and analysis of the self standing high towering structure suspension TMD vibration damping force and analysis[J].Journal of Vibration Engineering,2016,29(2):193-200.
[2]Stein M.Curved pedestrian bridge-straightforward design[C].2010 Structures Congress and the 19th Analysis and Computation Specialty Conference,2010:262-275.
[3]Tognoli J,Fitzwilliam D.A curved self anchored suspension bridge[J].Iabse Symposium Report,2010(8):6-13.
[4]Hekter J,Fletcher L.A city's signature centerpiece[J].Public Roads,2011,74(6):5.
[5]Samworth P,Brown P.Hand in hand[J].Bridge Design&Engineering,2011,2011(1):26-28.
[6]庞学雷.飘逸在水面上的彩虹——上海国际旅游度假区空间曲梁单边悬索桥的设计与施工[J].建筑施工,2015,37(12):1339-1341.Pang X L.Rainbow on the water surface-design and construction of curved suspension footbridge with single cable plane in Shanghai international tourism resort[J].Building Construction,2015,37(12):1339-1341.
[7]Baus U,Schlaich M.Footbridges:construction,design,history[M].Walter de Gruyter,2008.
[8]钱炜,汪磊.柔性悬索桥静力分析[J].现代交通技术.2009,6(1):52-54.Qian W,Wang L.Static analysis of flexible suspension bridges[J].Modern Transportation Technology,2009,6(1):52-54.
[9]庞学雷,于辉.空间曲梁双桥面单边悬索桥建设与创新[M].北京:人民交通出版社,2016.Pang X L,Yu H.Construction and innovation of single curved suspension bridge with double curved sides in spatial curved beam[M].Beijing:People's Communications Press,2016.
[10]陈路伟.空间曲梁单边悬索桥施工方案的研究[J].建筑施工,2015,37(12):1349-1350.Chen L W.Study on construction plan of spatial curved beam single side suspension bridge[J].Building Construction,2015,37(12):1349-1350.
[11]李建慧,李爱群,周广盼.混凝土自锚式悬索桥收缩徐变效应分析[J].防灾减灾工程学报,2016,36(6):906-912.Li J H,Li A Q,Zhou G P.Analysis of shrinkage and creep effect of concrete self anchored suspension bridges[J].Journal of Disaster Prevention and Mitigation Engineering,2016,36(6):906-912.
[12]Kleinhenz M P E.Analyzing a curved suspension timber bridge-connections and durability based on the project“a pilgrim’s walk”[D].Lunds Universitet,2012.
[13]Brown P,Kuhendran K,Marks J.Peace bridge,Londonderry:design and construction[J].Proceedings of the Institution of Civil Engineers-Bridge Engineering,2015,168(2):163-172.
[14]吴建东,周祥树.大跨度人行桥TMD减振分析[J].中外公路,2013,33(4):220-223.Wu J D,Zhou X S.Vibration reduction analysis of long span pedestrian bridge with TMD[J].Chinese and Foreign Highway,2013,33(4):220-223.
[15]袁正国.大跨度步行桥人行激励的TMD水平向减振[J].森林工程,2015,31(2):154-158.Yuan Z G.TMD Horizontal vibration reduction of large span footbridge under pedestrian excitation[J].Journal of Forest Engineering,2015,31(2):154-158.
[16]孙利民,杨伟,于军峰.等.空间曲梁单边悬索桥的振动舒适性评估及减振设计[J].建筑施工,2015,37(12):1345-1348.Sun L M,Yang W,Yu J F,et al.Vibration comfort evaluation and vibration reduction design of space curved beam unilateral suspension bridge[J].Building Construction,2015,37(12):1345-1348.
[17]李立斌.单索面悬索曲线梁桥的力学性能研究[D].南京:南京林业大学,2017.Li L B.Study on mechanical properties of single cable plane suspension curved beam bridge[D].Nanjing:Nanjing Forestry University,2017.
[18]Li J H,Feng D M,Li A Q,et al.Determination of reasonable finished state of self-anchored suspension bridges[J].Journal of Central South University,2016,23(1):209-219.
[19]CJJ 69─95,城市人行天桥与人行地道设计规范[S].CJJ 69─95,Technical specifications of urban pedestrian overcrossing and underpass[S].
[20]陈政清,华旭刚.人行桥的振动与动力设计[M].北京:人民交通出版社,2009.Chen Z Q,Hua X G.Vibration and dynamic design of pedestrian bridge[M].Beijing:People Communications Press,2009.
[21]阳治群.大跨异型玻璃悬索人行桥侧向振动临界人数估计[J].公路工程,2017,42(3):269-273.Yang Z Q.Estimation of critical number of lateral vibration of long-span shaped glass suspension footbridge[J].Highway Engineering,2017,42(3):269-273.
[22]王浩,刘海红,陶天友,等.TMD对列车作用下大跨钢桁架桥的振动控制研究[J].振动工程学报,2014,27(3):385-391.Wang H,Liu H H,Tao T Y,et al.Study on the vibration control of large span steel truss bridge under the action of TMD train[J].Journal of Vibration Engineering,2014,27(3):385-391.
[23]陈鑫,李爱群,张志强,等.自立式高耸结构悬吊式TMD减振动力试验与分析[J].振动工程学报,2016,29(2):193-200.Chen X,Li A Q,Zhang Z Q,et al.Test and analysis of the self standing high towering structure suspension TMD vibration damping force and analysis[J].Journal of Vibration Engineering,2016,29(2):193-200.