多塔斜拉桥力学特性及其关键力学参数研究
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摘要
采用有限元分析理论,应用三维有限元分析软件ANSYS,建立3~6塔主跨跨径为1 400 m的多塔斜拉桥有限元分析模型,分析了典型工况下4种方案的内力和变形,研究了索塔数对多塔斜拉桥静力特性、动力特性和静力稳定性的影响特点,探讨了索塔数对多塔斜拉桥活载挠度、塔顶纵向位移等关键力学参数的影响规律.分析结果表明:索塔数由3塔增至6塔时,塔根弯矩最大增大47.1%,主梁弯矩最大增大39.9%,边塔塔顶位移增加15%,一阶弹性稳定系数最大下降8.3%,颤振稳定性指数最大增加4.3%;主梁边跨竖向挠度比中间跨大11%左右,且中间跨挠度相近;索塔数对索塔受力影响显著.
Four 3d finite element models,including three-tower,four-tower,five-tower and six-tower cablestayed bridges,were established by using ANSYS software.Inter-force and deflection of the structure are analyzed to find some valuable mechanics characteristics,including the static property,dynamic property and static stability property of multi-tower cable-stayed bridge.Furthermore,the key mechanics problems affected by tower-numbers,such as deflection of beam,top displacements of tower,were discussed.The results show that comparing study on mechanics property of 3 to 6 cable-stayed bridge,bend moment of tower root increases maximally 47.1%,bend moment of beam increases maximally 39.9%,longitudinal displacement of side tower increases 15%,First order instability factor decreases maximally 15%,flutter stability index increases maximally4.3%.Deflection of beam in middle span was similar,and their values are larger than those of side span about11%.It is remarkable that inter-force of tower is large with increase number of tower.
Four 3d finite element models,including three-tower,four-tower,five-tower and six-tower cablestayed bridges,were established by using ANSYS software.Inter-force and deflection of the structure are analyzed to find some valuable mechanics characteristics,including the static property,dynamic property and static stability property of multi-tower cable-stayed bridge.Furthermore,the key mechanics problems affected by tower-numbers,such as deflection of beam,top displacements of tower,were discussed.The results show that comparing study on mechanics property of 3 to 6 cable-stayed bridge,bend moment of tower root increases maximally 47.1%,bend moment of beam increases maximally 39.9%,longitudinal displacement of side tower increases 15%,First order instability factor decreases maximally 15%,flutter stability index increases maximally4.3%.Deflection of beam in middle span was similar,and their values are larger than those of side span about11%.It is remarkable that inter-force of tower is large with increase number of tower.
引文
[1]张杨永.自锚式斜拉桥的极限跨径研究(Ⅰ)[J].重庆交通大学学报:自然科学版,2013,32(2):177-182.ZHANG Y Y.Limitation span of self-anchored cable-stayed bridge(Ⅰ)[J].J Chongqing Jiaotong Univ:Nat Sci Edi,2013,32(2):177-182.
[2]张杨永.自锚式斜拉桥的极限跨径研究(Ⅱ)[J].重庆交通大学学报:自然科学版,2013,32(3):369-373.ZHANG Y Y.Limitation span of self-anchored cable-stayed bridge(Ⅱ)[J].J Chongqing Jiaotong Univ:Nat Sci Edi,2013,32(3):369-373.
[3]杨进.多塔多跨悬索桥应用于海峡长桥建设的技术可行性与技术优势[J].桥梁建设,2009(2):36-39.YANG J.Technical feasibility and advantages of appliying multi-tower and multi-span suspension bridge to construction of long bridge across straits[J].Bridge Constr,2009(2):36-39.
[4]金立新,郭慧乾.多塔斜拉桥发展综述[J].公路,2010(7):24-29.JIN L X,GUO H Q.Review of the development of multi-tower cable-stayed bridge[J].Highway,2010(7):24-29.
[5]张喜刚,王仁贵,林道锦,等.嘉绍大桥多塔斜拉桥创新结构体系设计[J].公路,2013(7):286-289.ZHANG X G,WANG R G,LIN D J,et al.Innovation design of Jiashao Bridge multi-span cable-stayed bridge structure[J].Highway,2013(7):286-289.
[6]林道锦,李忠三,王仁贵.多塔斜拉桥力学性能研究[J].公路,2013(7):317-320.LIN D J,LI Z S,WANG R G.Study on mechanical properties of multi-tower cable-stayed bridge[J].Highway,2013(7):317-320.
[7]张喜刚,王仁贵,孟凡超,等.多塔斜拉桥分体钢箱梁的设计与施工[J].公路,2013(7):289-293.ZHANG X G,WANG R G,MENG F C,et al.Design and construction of divided steel box girder of multi-tower cablestayed bridges[J].Highway,2013(7):289-293.
[8]石丰祥,雷俊卿,林道锦,等.多塔斜拉桥施工过程稳定性分析[J].中外公路,2013,33(5):98-102.SHI F X,LEI J Q,LIN D J,et al.Analysis of stability of multi-tower cable-stayed bridge during construction process[J].J China Foreign Highway,2013,33(5):98-102.
[9]马婷婷,葛耀君,杨泳昕,等.临时墩对三塔斜拉桥最大双悬臂抖振控制研究[J].华中科技大学学报:自然科学版,2012,40(7):110-114.MA T T,GE Y J,YANG Y X,et al.Effects of temporary piers on buffeting control of longest double-cantilever's construction state in triple-tower cable-stayed bridge[J].J Huazhong Univ Sci Tech;Nat Sci Edi,2012,40(7):110-114.
[10]彭伟,彭天波,李建中.多塔斜拉桥纵向约束体系研究[J].同济大学学报:自然科学版,2009,37(8):1003-1009.PENG W,PENG T B,LI J Z.Research on longitudinal constraint systems for multispan cable-stayed bridges[J].J Tongji Univ:Nat Sci Edi,2009,37(8):1003-1009.
[11]房贞政,张超,陈永健,等.基于三台阵振动台的多塔斜拉桥试验研究[J].土木工程学报,2012,45(SI):25-29.FANG Z Z,ZHANG C,CHEN Y J,et al.Research on the shaking table test of three towers cable-stayed bridge based on three shaking table system[J].China Civil Engin J,2012,45(S1):25-29.
[12]方圆,李建中,彭天波,等.行波效应对大跨度多塔斜拉桥地震反应影响[J].振动与冲击,2010,29(10):148-152.FANG Y,LI J Z,PENG T B,et al.Influence of travelling-save effect on seismic response of a long-span multi-tower cable stayed bridge[J].J Vibrat Shock,2010,29(10):148-152,235.
[13]GIMSING N.Structural systems for multispan cable suspended bridges[C]//Orlando,Fl,USA:ASCE,1987.
[2]张杨永.自锚式斜拉桥的极限跨径研究(Ⅱ)[J].重庆交通大学学报:自然科学版,2013,32(3):369-373.ZHANG Y Y.Limitation span of self-anchored cable-stayed bridge(Ⅱ)[J].J Chongqing Jiaotong Univ:Nat Sci Edi,2013,32(3):369-373.
[3]杨进.多塔多跨悬索桥应用于海峡长桥建设的技术可行性与技术优势[J].桥梁建设,2009(2):36-39.YANG J.Technical feasibility and advantages of appliying multi-tower and multi-span suspension bridge to construction of long bridge across straits[J].Bridge Constr,2009(2):36-39.
[4]金立新,郭慧乾.多塔斜拉桥发展综述[J].公路,2010(7):24-29.JIN L X,GUO H Q.Review of the development of multi-tower cable-stayed bridge[J].Highway,2010(7):24-29.
[5]张喜刚,王仁贵,林道锦,等.嘉绍大桥多塔斜拉桥创新结构体系设计[J].公路,2013(7):286-289.ZHANG X G,WANG R G,LIN D J,et al.Innovation design of Jiashao Bridge multi-span cable-stayed bridge structure[J].Highway,2013(7):286-289.
[6]林道锦,李忠三,王仁贵.多塔斜拉桥力学性能研究[J].公路,2013(7):317-320.LIN D J,LI Z S,WANG R G.Study on mechanical properties of multi-tower cable-stayed bridge[J].Highway,2013(7):317-320.
[7]张喜刚,王仁贵,孟凡超,等.多塔斜拉桥分体钢箱梁的设计与施工[J].公路,2013(7):289-293.ZHANG X G,WANG R G,MENG F C,et al.Design and construction of divided steel box girder of multi-tower cablestayed bridges[J].Highway,2013(7):289-293.
[8]石丰祥,雷俊卿,林道锦,等.多塔斜拉桥施工过程稳定性分析[J].中外公路,2013,33(5):98-102.SHI F X,LEI J Q,LIN D J,et al.Analysis of stability of multi-tower cable-stayed bridge during construction process[J].J China Foreign Highway,2013,33(5):98-102.
[9]马婷婷,葛耀君,杨泳昕,等.临时墩对三塔斜拉桥最大双悬臂抖振控制研究[J].华中科技大学学报:自然科学版,2012,40(7):110-114.MA T T,GE Y J,YANG Y X,et al.Effects of temporary piers on buffeting control of longest double-cantilever's construction state in triple-tower cable-stayed bridge[J].J Huazhong Univ Sci Tech;Nat Sci Edi,2012,40(7):110-114.
[10]彭伟,彭天波,李建中.多塔斜拉桥纵向约束体系研究[J].同济大学学报:自然科学版,2009,37(8):1003-1009.PENG W,PENG T B,LI J Z.Research on longitudinal constraint systems for multispan cable-stayed bridges[J].J Tongji Univ:Nat Sci Edi,2009,37(8):1003-1009.
[11]房贞政,张超,陈永健,等.基于三台阵振动台的多塔斜拉桥试验研究[J].土木工程学报,2012,45(SI):25-29.FANG Z Z,ZHANG C,CHEN Y J,et al.Research on the shaking table test of three towers cable-stayed bridge based on three shaking table system[J].China Civil Engin J,2012,45(S1):25-29.
[12]方圆,李建中,彭天波,等.行波效应对大跨度多塔斜拉桥地震反应影响[J].振动与冲击,2010,29(10):148-152.FANG Y,LI J Z,PENG T B,et al.Influence of travelling-save effect on seismic response of a long-span multi-tower cable stayed bridge[J].J Vibrat Shock,2010,29(10):148-152,235.
[13]GIMSING N.Structural systems for multispan cable suspended bridges[C]//Orlando,Fl,USA:ASCE,1987.
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