中墩独柱支撑小半径曲线梁桥受力特性及优化分析

发布时间：2018-03-29 20:41

本文选题：荷载试验　切入点：有限元分析　出处：《长沙理工大学》2015年硕士论文

【摘要】：随着我国桥梁事业的蓬勃发展,小半径预应力混凝土曲线梁桥以其造型美观、占地小、造价较低等优点在城市交通中应用的越来越广泛,与此同时,由于对小半径曲线梁桥认识不足,导致工程病害及事故常有发生,因而对小半径曲线梁桥的深入研究也越发显得重要。本文以湖南省某桥为工程背景,采用有限元分析和荷载试验相结合的方法,对中墩独柱支撑的小半径预应力混凝土曲线梁力学性能以及优化措施进行了研究。本文的研究工作和主要成果如下:(1)根据小半径曲线梁桥的计算理论以及数值计算方法,利用通用有限元软件ANSYS以及桥梁专用软件MIDAS/Civil分析了该桥在自重、预应力荷载以及移动荷载作用下的力学性能,如扭矩分布、应力以及支座反力大小。(2)研究分析了非对称布置力筋、支座偏心以及加强截面刚度对该桥的挠度以及扭矩分布情况的影响,提出了改善小半径曲线箱梁桥力学性能的优化措施,并针对背景工程提出改进方案。(3)通过背景工程的静载试验,测定各控制截面的挠度以及应变值,换算后得到各关键截面的弯矩值,将测试结果与数值计算结果进行对比分析,对该桥改进方案条件下的实际刚度以及承载力进行了评价,得出满足《大跨度混凝土桥梁试验方法》的结论。(4)通过结构的跑车试验、跳车试验以及刹车试验,得出结构的实测基频、自振特性以及冲击系数等动力参数,结合有限元分析得到结构的基频,并利用这些实测数据进一步判断结构在进行改进优化之后的整体性能和运营状态。
[Abstract]:With the rapid development of bridges in our country, prestressed concrete curved beam bridges with small radius have been used more and more widely in urban traffic with the advantages of beautiful shape, small area, low cost and so on. Because of the lack of understanding of the small radius curved girder bridge, engineering diseases and accidents often occur, so it is more and more important to study the small radius curve beam bridge. In this paper, a bridge in Hunan Province is taken as the engineering background. The method of combining finite element analysis with load test is used. The mechanical properties and optimization measures of small radius prestressed concrete curved beams supported by single column with middle piers are studied in this paper. The main research results are as follows: 1) according to the calculation theory and numerical method of small radius curved beam bridge, The mechanical properties, such as torque distribution of the bridge under dead weight, prestressed load and moving load, are analyzed by using the general finite element software ANSYS and the special bridge software MIDAS/Civil. Stress and support counterforce. The influence of asymmetric arrangement of force bars, eccentricity of support and stiffness of stiffening section on the deflection and torque distribution of the bridge is analyzed, and the optimization measures for improving the mechanical properties of small radius curved box girder bridges are put forward. According to the background engineering, the paper puts forward an improved scheme. 3) through the static load test of the background engineering, the deflection and strain values of each control section are measured, and the bending moment values of each key section are obtained by conversion. The test results are compared with the results of numerical calculation. The actual stiffness and bearing capacity of the bridge under the condition of the improved scheme are evaluated, and the conclusion that meets the test method of long-span concrete bridge is obtained. The dynamic parameters such as the measured fundamental frequency, the natural vibration characteristic and the impact coefficient of the structure are obtained, and the fundamental frequency of the structure is obtained by using the finite element analysis, and the overall performance and operation state of the structure after the improvement and optimization are further judged by these measured data.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.21

【相似文献】