设计荷载作用下大跨度铁路悬索桥的梁端变位特征
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摘要
以连(云港)镇(江)铁路五峰山长江大桥为工程背景,基于有限元分析,研究该桥在基础不均匀沉降、温度荷载、风荷载、竖向活载及制动力作用下的梁端变位特征及荷载组合效应。结果表明:梁端纵向位移主要影响因素为温度荷载和竖向活载,其次为纵向风荷载、基础沉降和列车制动力;梁端竖向转角受竖向活载和基础不均匀沉降影响最大;横向极限风荷载和温度荷载对梁端横向位移和转角存在一定影响;主、引桥之间的横向位移差引起梁端横向折角。除考虑梁端纵向位移和竖向转角外,铁路悬索桥在设计时也应关注梁端横向位移和横向折角,可通过结构约束体系、端横梁局部合理设计及主、引桥支座位置优化等措施满足梁端空间变位要求,从而为大位移梁端伸缩装置的设计和梁端区域行车的安全平稳提供有利条件。
Taking Wufengshan Yangtze River Bridge of Lianyungang-Zhenjiang railway as engineering background,the displacement characteristics at girder end and load combination effects of the bridge under the actions of uneven settlement of foundation,temperature load,wind load,vertical live load and braking force were studied based on the f inite element analysis. The results showthat the main factors affecting the longitudinal displacement at girder end are temperature load and vertical live load,followed by longitudinal wind load,foundation settlement and train braking force.The vertical rotation angle at girder end is most affected by vertical live load and uneven settlement of foundation.The transverse ultimate wind load and temperature load have certain influence on the transverse displacement and rotation angle at girder end.In addition to considering the longitudinal displacement and vertical rotation angle at girder end,the transverse displacement and transverse bending angle at girder end should also be paid attention to in the design of railway suspension bridges.The requirements of spatial displacement at girder end can be satisf ied by means of structural restraint system,local rational design at girder end and optimization the locations of the main and approach bridge bearing.It provides favorable conditions for the design of expansion device with large displacement at girder end,and the safe and stable driving at girder end.
Taking Wufengshan Yangtze River Bridge of Lianyungang-Zhenjiang railway as engineering background,the displacement characteristics at girder end and load combination effects of the bridge under the actions of uneven settlement of foundation,temperature load,wind load,vertical live load and braking force were studied based on the f inite element analysis. The results showthat the main factors affecting the longitudinal displacement at girder end are temperature load and vertical live load,followed by longitudinal wind load,foundation settlement and train braking force.The vertical rotation angle at girder end is most affected by vertical live load and uneven settlement of foundation.The transverse ultimate wind load and temperature load have certain influence on the transverse displacement and rotation angle at girder end.In addition to considering the longitudinal displacement and vertical rotation angle at girder end,the transverse displacement and transverse bending angle at girder end should also be paid attention to in the design of railway suspension bridges.The requirements of spatial displacement at girder end can be satisf ied by means of structural restraint system,local rational design at girder end and optimization the locations of the main and approach bridge bearing.It provides favorable conditions for the design of expansion device with large displacement at girder end,and the safe and stable driving at girder end.
引文
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[2]国家铁路局.铁路桥涵设计规范:TB 10002—2017[S].北京:中国铁道出版社,2017.
[3]李永乐,蔡宪棠,安伟胜,等.大跨度铁路悬索桥结构刚度敏感性研究[J].中国铁道科学,2011,32(4):24-30.
[4]刘晓光,郭辉,赵欣欣.沪通长江大桥主航道桥总体设计参数分析[J].桥梁建设,2015,45(6):63-68.
[5]HE X H,WU T,ZOU Y F,et al.Recent Developments of High-speed Railway Bridges in China[J]. Structure&Infrastructure Engineering,2017,13(12):1584-1595.
[6]徐恭义.千米级跨度铁路桥梁的受力性能研究[J].中国铁道科学,2011,32(2):56-60.
[7]刘辉,徐恭义.我国正在设计修建的特大跨度铁路桥梁及其技术特点[J].铁道工程学报,2007,24(9):22-26.
[8]沈锐利,张东,唐茂林.大跨度铁路悬索桥合理刚度指标值的探讨[C]//中国土木工程学会.第二十届全国桥梁学术会议论文集.北京:人民交通出版社,2012:233-240.
[9]胡所亭,郭辉,鞠晓臣.沪通长江大桥主航道桥受力特征研究[J].桥梁建设,2015,45(6):18-23.
[10]魏亚辉.高速铁路无砟轨道桥梁梁端变形相关问题研究[D].北京:中国铁道科学研究院,2012.
[11]唐贺强,徐恭义,刘汉顺.悬索桥用于铁路桥梁的可行性分析[J].桥梁建设,2017,47(2):13-18.
[12]中铁大桥勘测设计院集团有限公司.新建铁路连云港至镇江线五峰山长江特大桥工程施工图设计[Z].武汉:中铁大桥勘测设计院集团有限公司,2015.
[13]刘晓光,郭辉,蒋金洲,等.千米跨度公铁两用悬索桥关键技术研究:大位移梁端伸缩装置与钢轨伸缩调节器研究报告[R].北京:中国铁道科学研究院,2017.