弯桥承载力检测理论与技术研究
发布时间：2019-06-25 07:58
【摘要】：随着中国城市交通建设的飞速发展,弯桥已经成为现代交通基础设施的重要桥型。弯桥由于受力性能复杂,力学性能除受桥梁跨度、截面形式和配筋率的影响外,还要受到曲率半径、圆心角、梁宽及弯扭刚度比的影响,十分复杂。在现行规范中,对弯桥的承载力检测方案没有明确给出,其承载力检测理论和技术方面还存在诸多问题尚未解决,这对于正确评估这类桥梁的工作性能及承载能力具有重大影响。本文首先介绍了弯桥的力学特性、构造特点及理论分析方法。以30m+40m+30m的三跨连续弯箱梁桥为例,采用有限元软件Midas civil对弯桥进行梁格法分析,结合有限元实体单元软件Midas FEA建立实体单元模型,进行了大量的计算和分析比较;第二,通过数值解得到的相关数据,分析比较了相关试验工况的荷载效应、剪力滞的分布,得出弯桥中由于扭矩的存在加强了箱梁的剪力滞效应,并通过试验实测值验证了结论的正确性;第三,通过对控制截面应力大小,位置和梁底沿半径切线方向的弯拉应力的分析比较,确定了在弯桥中梁底应力可代替主应力起到控制作用,从而确定了应变片的粘贴位置及方向;第四,计算分析了弯桥截面中扭矩所产生的剪应力对于弯桥承载力检测的影响,以及应变片因粘贴偏角的误差公式推导。根据以上分析研究结果,提出了改善弯桥试验检测效果的相关方法,这对于提高弯桥检测效果、评价弯桥的工作性能及承载能力的准确性都具有重大的意义。
[Abstract]:With the rapid development of urban traffic construction in China, curved bridge has become an important bridge type of modern traffic infrastructure. Because of the complexity of mechanical properties of curved bridge, the mechanical properties are not only affected by bridge span, section form and reinforcement ratio, but also affected by curvature radius, circular center angle, beam width and bending-torsional stiffness ratio. In the current code, the bearing capacity detection scheme of curved bridge is not given clearly, and there are still many problems to be solved in the theory and technology of bearing capacity testing, which has a great influence on the correct evaluation of the working performance and bearing capacity of this kind of bridge. In this paper, the mechanical properties, structural characteristics and theoretical analysis methods of curved bridges are introduced. Taking 30m 40m 30m three-span continuous curved box girder bridge as an example, the finite element software Midas civil is used to analyze the curved bridge by beam lattice method. Combined with the finite element entity element software Midas FEA, the solid element model is established, and a large number of calculation, analysis and comparison are carried out. Secondly, through the relevant data obtained by numerical solution, the load effect and shear lag distribution of related test conditions are analyzed and compared, and it is concluded that the shear lag effect of box girder is strengthened due to the existence of torque in curved bridge, and the correctness of the conclusion is verified by the measured values. Thirdly, by analyzing and comparing the stress of the control section, the position and the bending tensile stress of the beam bottom along the tangent direction of the radius, it is determined that the stress at the bottom of the beam can replace the principal stress in the curved bridge, thus determining the bonding position and direction of the strain gauge. Fourth, the influence of the shear stress caused by the torque in the section of the curved bridge on the bearing capacity of the curved bridge is calculated and analyzed, and the error formula of the strain gauge due to the sticking deflection angle is deduced. According to the above analysis and research results, the related methods to improve the test and detection effect of curved bridge are put forward, which is of great significance to improve the detection effect of curved bridge and evaluate the working performance and bearing capacity of curved bridge.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.2;U446
本文编号：2505525
[Abstract]:With the rapid development of urban traffic construction in China, curved bridge has become an important bridge type of modern traffic infrastructure. Because of the complexity of mechanical properties of curved bridge, the mechanical properties are not only affected by bridge span, section form and reinforcement ratio, but also affected by curvature radius, circular center angle, beam width and bending-torsional stiffness ratio. In the current code, the bearing capacity detection scheme of curved bridge is not given clearly, and there are still many problems to be solved in the theory and technology of bearing capacity testing, which has a great influence on the correct evaluation of the working performance and bearing capacity of this kind of bridge. In this paper, the mechanical properties, structural characteristics and theoretical analysis methods of curved bridges are introduced. Taking 30m 40m 30m three-span continuous curved box girder bridge as an example, the finite element software Midas civil is used to analyze the curved bridge by beam lattice method. Combined with the finite element entity element software Midas FEA, the solid element model is established, and a large number of calculation, analysis and comparison are carried out. Secondly, through the relevant data obtained by numerical solution, the load effect and shear lag distribution of related test conditions are analyzed and compared, and it is concluded that the shear lag effect of box girder is strengthened due to the existence of torque in curved bridge, and the correctness of the conclusion is verified by the measured values. Thirdly, by analyzing and comparing the stress of the control section, the position and the bending tensile stress of the beam bottom along the tangent direction of the radius, it is determined that the stress at the bottom of the beam can replace the principal stress in the curved bridge, thus determining the bonding position and direction of the strain gauge. Fourth, the influence of the shear stress caused by the torque in the section of the curved bridge on the bearing capacity of the curved bridge is calculated and analyzed, and the error formula of the strain gauge due to the sticking deflection angle is deduced. According to the above analysis and research results, the related methods to improve the test and detection effect of curved bridge are put forward, which is of great significance to improve the detection effect of curved bridge and evaluate the working performance and bearing capacity of curved bridge.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.2;U446
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1 纪轩彪;弯梁桥力学性能及施工监控研究[D];兰州交通大学;2011年
，本文编号：2505525
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