某独塔斜拉桥荷载试验研究

发布时间：2018-04-06 20:09

本文选题：斜拉桥　切入点：有限元　出处：《浙江工业大学》2015年硕士论文

【摘要】：斜拉桥由于跨越能力好、通航影响小、整体刚度大、抗震性能好以及造价低等优势成为了大跨度桥梁结构中最主要的桥型之一,我国现代化桥梁也越来越多的选用了斜拉桥桥型。随着斜拉桥跨度不断增大,斜拉塔结构形式不断更新,通过荷载试验来检验斜拉桥的成桥质量是十分必要的。斜拉桥的荷载试验不仅可以直接反映出桥梁的安全性以及适用性,还可以为同类桥梁设计积累经验,为将来桥梁在运营及养护过程提供必要的基础性资料。本文依托某异型独塔斜拉桥工程,对该斜拉桥进行荷载试验研究,主要研究内容如下:运用有限元软件Midas/Civil 2012对该斜拉桥进行建模,计算该斜拉桥在设计活荷载作用下的内力与变形,得到试验控制截面;计算在各试验工况下,桥梁控制截面的挠度与应变的理论解;对桥梁进行模态分析,得出桥梁的前三阶振型,得到其固有频率。验证桥梁的设计合理性,并为将来同类桥梁的有限元建模提供参考。本次荷载试验通过静载试验测定该斜拉桥的主梁正应力及其沿梁高、梁宽的分布规律、主梁竖向挠度、索塔应力、斜拉索索力以及裂缝开展情况;通过动载试验对桥梁的动力特性和在特定动荷载作用下桥梁的动应变进行了测定。通过荷载试验实测数据与有限元模拟理论解的比较,评估该斜拉桥的工作状况。研究表明,该斜拉桥外观良好,梁桥结构的工作状态良好,动力性能满足设计要求,结构总体满足公路I级承载力及刚度要求。本文的研究结果可以为同类型桥梁的荷载试验提供借鉴,也可以为斜拉桥设计方法与试验规范提供数据参考。
[Abstract]:The cable-stayed bridge has become one of the most important bridge types in the long-span bridge structure because of its advantages of good span capacity, small navigation influence, large overall stiffness, good seismic performance and low cost.More and more cable-stayed bridges are used in modern bridges in China.With the increasing span of cable-stayed bridge and the renewal of cable-stayed tower structure, it is necessary to test the quality of cable-stayed bridge by load test.The load test of cable-stayed bridge can not only directly reflect the safety and applicability of the bridge, but also accumulate experience for the similar bridge design, and provide the necessary basic information for the future operation and maintenance of the bridge.Based on the engineering of a special type cable-stayed bridge with single tower, the main contents of this paper are as follows: the finite element software Midas/Civil 2012 is used to model the cable-stayed bridge.The internal force and deformation of the cable-stayed bridge under the design live load are calculated, the experimental control section is obtained, the theoretical solution of the deflection and strain of the bridge control section is calculated under each test condition, and the modal analysis of the bridge is carried out.The first three vibration modes of the bridge are obtained and its natural frequency is obtained.Verify the rationality of bridge design and provide reference for the future finite element modeling of similar bridges.Through static load test, the normal stress of the main beam of the cable-stayed bridge and its distribution along the beam height and width, the vertical deflection of the main beam, the stress of the cable tower, the cable-stayed cable force and the crack development are measured by the static load test.The dynamic characteristics of the bridge and the dynamic strain of the bridge under specific dynamic loads were measured by dynamic load test.The working condition of the cable-stayed bridge is evaluated by comparing the measured data of load test with the theoretical solution of finite element simulation.The results show that the cable-stayed bridge has a good appearance, a good working state of the girder bridge structure, a good dynamic performance to meet the design requirements, and the overall structure meets the requirements of highway class I bearing capacity and stiffness.The results of this paper can be used for reference for the load test of the same type of bridges, as well as for the design methods and test specifications of cable-stayed bridges.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U446;U448.27

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