连续刚构桥单箱两室截面主梁在偏载作用下的静力分析  

Static Analysis for Main Girder with Single-Box Two-Room Section of Continuous Rigid-Frame Bridge in the Action of Partial Load

作　　者：陈玉骥[1] 罗旗帜[1,2] 刘登 

机构地区：[1]佛山科学技术学院土木工程系,广东佛山528000 [2]湖南大学土木工程学院,湖南长沙410082

出　　处：《中北大学学报（自然科学版）》2017年第5期549-555,共7页Journal of North University of China(Natural Science Edition)

基　　金：国家自然科学基金资助项目(10772046);广东省自然科学基金资助项目(S2011010005037)

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.

关 键 词：连续刚构桥 偏载 桥墩弯曲变形 剪力滞 静力分析 

分 类 号：U448.231[建筑科学—桥梁与隧道工程]