连续刚构桥单箱两室截面主梁在偏载作用下的静力分析
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摘要
为了研究连续刚构桥单箱两室截面主梁在偏载作用下考虑剪力滞效应的力学特性,依据能量变分原理,考虑桥墩弯曲变形和主梁剪力滞效应,建立了单箱两室截面连续刚构桥在偏载作用下的力学模型.以三角函数为基函数表示主梁的位移,以幂函数表示桥墩的位移,得到了结构的刚度方程.据此计算了新九江大桥6×50m引桥在成桥荷载试验下的应变和挠度,并与测试结果进行了对比.结果表明,偏载作用下,主梁应变横向分布不均匀,加载应变大于非加载侧;腹板变形符合平面变形假定;若不考虑桥墩的弯曲变形影响,将高估连续刚构桥主梁的最大位移和最大应变;本文结果与测试值较为吻合.
In order to study mechanical behavior for main girder with single-box two-room section of continuous rigid-frame bridge in the action of partial load considering shear lag effect,based on energy various principle,the mechanics model for the continuous rigid-frame bridge with the single-box two-room section in the action of partial load in considering the moment deformation of bridge column and shear lag of main beam was set up.The stiffness equation of the structure was obtained by taking trigonometric function as the displacement of the main beam and power function as bridge pier displacement.The strains and deflections for 6×50 mapproach bridge of new Jiujiang bridge in load test at bridge were calculated.The computed results were compared with those of test.It is shown that in the action of partial load,the transverse distribution of strains on main beam are no-uniform,the strains at load side are larger than those at no-load side;the deformation of web is fit to the plane assumption;if the moment deformation of bridge column is not considered,the maximum strain and deflection of main beam on the continuous rigid-frame bridge will be highly estimated;the results are agreement with tests.
In order to study mechanical behavior for main girder with single-box two-room section of continuous rigid-frame bridge in the action of partial load considering shear lag effect,based on energy various principle,the mechanics model for the continuous rigid-frame bridge with the single-box two-room section in the action of partial load in considering the moment deformation of bridge column and shear lag of main beam was set up.The stiffness equation of the structure was obtained by taking trigonometric function as the displacement of the main beam and power function as bridge pier displacement.The strains and deflections for 6×50 mapproach bridge of new Jiujiang bridge in load test at bridge were calculated.The computed results were compared with those of test.It is shown that in the action of partial load,the transverse distribution of strains on main beam are no-uniform,the strains at load side are larger than those at no-load side;the deformation of web is fit to the plane assumption;if the moment deformation of bridge column is not considered,the maximum strain and deflection of main beam on the continuous rigid-frame bridge will be highly estimated;the results are agreement with tests.
引文
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[2]肖新辉,刘扬,郭鑫,等.组合高墩大跨连续刚构桥箱梁日照温度场观测与效应分析[J].铁道科学与工程,2014,11(1):10-16.Xiao Xinhui,Liu Yang,Guo Xin,et al.Observation and study of temperature distribution in combination of high pier large span continuous and rigid frame bridge[J].Journal of railway science and engineering,2014,11(1):10-16.(in Chinese)
[3]杜鹏.空腹式梯形箱梁连续刚构桥施工过程结构分析与监测[D].重庆:重庆交通大学,2014.
[4]项贻强,丰硕,汪劲丰,等.大跨径单室预应力连续刚构箱梁桥的静力特性空间分析[J].公路交通科技,2005,22(3):58-61.Xiang Yiqiang,Feng Shuo,Wang Jinfeng,et al.Spatial static behavior analysis of long-span P·C·continuous rigid-frame box girder bridge with single cell[J].Journal of Highway and Transportation Research and Development,2005,22(3):58-61.(in Chinese)
[5]苏超.大跨高墩连续刚构桥空间力学特性分析[D].成都:西南交通大学,2006.
[6]车树汶.连续刚构桥的剪力滞效应分析[J].城市道桥与防洪,2006(1):35-38.Che Shuwen.Analysis of shear lag effect of continuous rigid frame bridge[J].Urban Roads Bridges&Flood Control,2006(1):35-38.(in Chinese)
[7]李旺丰,虞建成.连续刚构桥悬臂施工阶段的预应力剪力滞效应分析[J].河北交通科技,2006,3(4):55-57,69.Li Wangfeng,Yu Jiancheng.Analysis of pre-stress shear lag during construction of continuous rigid-frame box girder bridge[J].Hebei Jiaotong Science and Technology,2006,3(4):55-57,69.(in Chinese)
[8]金中凡,罗昌宏,张高朝.大跨连续刚构桥的荷载试验[J].中外公路,2010,30(5):166-169.Jing Zhongfan,Luo Changhong,Zhang Gaocao.Load test for the long span continuous rigid-framed bridge[J].Journal of China&Foreign Highway,2010,30(5):166-169.(in Chinese)
[9]杨奇,冷伍明,聂如松,等.大跨径预应力混凝土连续刚构桥施工监控分析[J].铁道科学与工程学报,2010,7(1):11-15.Yang Qi,Leng Wuming,Nie Rusong,et al.Construction control research and analysis of the large span prestressed concrete continuous rigid frame bridge[J].Journal of Railway Science and Engineering,2010,7(1):11-15.(in Chinese)
[10]马熙伦.高墩大跨连续刚构桥的力学性能研究[D].兰州:兰州交通大学,2010.
[11]李子春.桥墩形式对连续刚构桥动力特特性的影响[J].中国公路学报,2011,24(2):70-76.Li Zichun.Influence of bridge pier form on dynamic characteristic of continuous rigid frame bridge[J].China Journal of Highway and Transport,2011,24(2):70-76.(in Chinese)
[12]安里鹏,汪宏,安永日.波形钢腹板连续刚构桥静力特性分析[J].重庆交通大学学报(自然科学版),2011,30(5):903-906,1026.An Lipeng,Wang Hong,An Yongri.Static analysis of characteristic of continuous rigid bridge with corrugated steel webs[J].Journal of Chongqing Jiaotong University(Natural Science),2011,30(5):903-906,1026.(in Chinese)
[13]肖金军,司徒毅,陈玉骥,等.预应力连续刚构桥荷载试验下的应力状态分析[J].中外公路,2011,31(5):86-89.
[14]邵旭东,程翔云,李立峰.桥梁设计与计算[M].北京:人民交通出版社,2008.
[15]陈玉骥,罗旗帜.考虑3个剪力滞位移函数的曲线箱梁大挠度问题[J].中国铁道科学,2007,28(1):13-17.Chen Yuji,Luo Qizhi.The analysis of large deflection of curved box girders in considering three shear lag functions[J].Chian Railway Science,2007,28(1):13-17.(in Chinese)
[16]徐芝伦.弹性力学[M].第4版.北京:高等教育出版社,2006.