索夹对自锚悬索桥成桥状态影响分析
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摘要
基于有限单元法(FEMC)比较分析了索夹对自锚悬索桥成桥状态的影响.索夹能够提高中跨主缆的成桥线形,在维持索长不变的情况下,各吊杆的成桥索力会有所增大,若使各吊杆均达到设计成桥索力值,则需增大各吊杆的无应力长度值.基于计入索夹影响的FEMC模型分别讨论了索夹长度、截面面积和惯性矩等参数对结构成桥状态的影响,并且建立了根据索夹长度比和面积比计算得到的主缆中跨跨中控制点成桥高程提升量和吊杆索力平均增量值的简化计算公式.经工程实例验证,提出的索夹模型计算结果与结构实际变形接近.
The impacts of cable clamps on the completed state of a self-anchored suspension bridge were analyzed based on the finite element method(FEMC).The cable clamp could raise the shape of main cable in a middle span.If the unstressed length of each boom was kept unchanged,the pulling force of each boom would increase.In the same way,if each boom was made to reach the designed force on the completed stage of a bridge,the unstressed length of each boom should be increased.Based on FEMC,the impacts of parameters,e.g.length,cross-sectional area and moment of inertia on the completed state of a bridge,were studied respectively. Furthermore,the simplified formulas were established,which could calculate the elevation increment of mid-position of main cable in the middle span and the average increment of each boom force by the length ratio and area ratio of cable clamp.It is verified that results from FEMC are in good agreement with the measured data.
The impacts of cable clamps on the completed state of a self-anchored suspension bridge were analyzed based on the finite element method(FEMC).The cable clamp could raise the shape of main cable in a middle span.If the unstressed length of each boom was kept unchanged,the pulling force of each boom would increase.In the same way,if each boom was made to reach the designed force on the completed stage of a bridge,the unstressed length of each boom should be increased.Based on FEMC,the impacts of parameters,e.g.length,cross-sectional area and moment of inertia on the completed state of a bridge,were studied respectively. Furthermore,the simplified formulas were established,which could calculate the elevation increment of mid-position of main cable in the middle span and the average increment of each boom force by the length ratio and area ratio of cable clamp.It is verified that results from FEMC are in good agreement with the measured data.
引文
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[11]孙永明,李惠.端部性质对频率法测量竖直拉索索力影响分析[J].工程力学,2013,30(8):10.SUN Yongming,LI Hui.Effect of extreme properties of vertical cable on the cable force measurement by frequencies-based method[J].Engineering Mechanics,2013,30(8):10.
[2]孙永明,张连振,李忠龙.自锚式悬索桥吊杆目标索力影响参数分析[J].桥梁建设,2015,45(4):69.SUN Yongming,ZHANG Lianzhen,LI Zhonglong.Affectingfactor study on boom’s target force of self-anchored suspension bridge[J].Bridge Construction,2015,45(4):69.
[3]沈锐利.悬索桥主缆系统设计及架设算法研究[J].土木工程学报,1996,29(2):3.SHEN Ruili.Calculation methods for design and erection of cable curve of suspension bridge[J].China Civil Engineering Journal,1996,29(2):3.
[4]陈常松,陈政清,颜东煌.悬索桥主桥初始线形的悬链线方程精细迭代分析法[J].工程力学,2006,23(8):62.CHEN Changsong,CHEN Zhengqing,YAN Donghuang.Accurate interation method to calculate the initial states of main cables of suspension bridges[J].Engineering Mechanics,2006,23(8):62.
[5]程斌,孙海涛,肖汝诚.自锚式悬索桥的主缆线形计算与误差分析[J].华南理工大学学报:自然科学版,2008,36(6):17.CHENG Bin,SUN Haitao,XIAO Rucheng.Configuration calculation and deviation analysis on main cable of self-anchored suspension bridge[J].Journal of South China University of Technology:Natural Science Edition,2008,36(6):17.
[6]黄海云,张俊平,刘爱荣,等.空间索面自锚式悬索桥主缆横向位移及索夹横向偏转角的试验研究[J].公路工程,2009,34(2):41.HUANG Haiyun,ZHANG Junping,LIU Airong,et al.Testing study on lateral displacement of main cable and lateral deflection angle of cable clamp in the self-anchored suspension bridge with spatial cable system[J].Highway Engineering,2009,34(2):41.
[7]黎志忠,蒋劲松.悬索桥上、下对合型索夹结构分析研究[J].桥梁建设,2013,43(3):60.LI Zhizhong,JIANG Jinsong.Analysis and study of cable band structure of upper and lower halves type for suspension bridge[J].Bridge Construction,2009,43(3):60.
[8]孙永明.基于组合单元的混凝土斜拉桥施工过程分析与控制方法研究[D].哈尔滨:哈尔滨工业大学,2009.SUN Yongming.Construction process analysis and construction control techniques research of concrete cable-stayed bridge based on composite element[D].Harbin:Harbin Institute of Technology,2009.
[9]刘厚军,刘钊.自锚式悬索桥吊索张力及主缆线形的设计研究[J].土木工程学报,2008,41(3):79.LIU Houjun,LIU Zhao.Design of hanger tension and cable configuration for self-anchored suspension bridges[J].China Civil Engineering Journal,2008,41(3):79.
[10]孙永明,孙航,任远.频率法计算匀质竖直拉索索力的实用公式[J].工程力学,2013,30(4):211.SUN Yongming,SUN Hang,REN Yuan.Practical formulas to calculate tensions of vertical cable with uniform properties by frequency method[J].Engineering Mechanics,2013,30(4):211.
[11]孙永明,李惠.端部性质对频率法测量竖直拉索索力影响分析[J].工程力学,2013,30(8):10.SUN Yongming,LI Hui.Effect of extreme properties of vertical cable on the cable force measurement by frequencies-based method[J].Engineering Mechanics,2013,30(8):10.