崇启大桥主桥钢箱梁TMD系统设计参数计算研究

发布时间：2018-02-26 08:53

本文关键词： 崇启大桥钢箱梁涡激振动控制 TMD 设计参数　出处：《土木工程学报》2015年05期 　论文类型：期刊论文

【摘要】：崇启大桥主桥为六跨双幅钢箱连续梁桥,其跨径布置为:102m+4×185m+102m=944m。风洞试验识别出大桥有发生竖向涡激振动的可能,为制止运营期可能发生的涡激振动,对比主动控制和被动控制技术方案,综合比选采用TMD(Tuned Mass Damper,调谐质量阻尼器)制振措施。计算主桥动力特性并进行实桥风洞试验,对试验结果进行频谱分析后确定一阶竖向反对称是涡激振动的主振型,基于该振型特点初步确定TMD布置位置。根据理论和数值计算初步确定了TMD频率、质量、阻尼比、行程等参数,利用谐响应和时程两种方法对TMD减振效果进行设计验证,指出低频TMD设计的主要难点和解决思路;为指导TMD安装施工,进行频率、质量、阻尼比的参数敏感性分析,明确TMD主要设计参数安装容许偏差,提出安装完成后验收指标。崇启大桥是国内首座采用TMD控制涡激振动的特大型桥梁,研究对类似结构的风致涡激振动控制积累了工程经验,对TMD设计、检验评定、制造验收等相关规范的编制具有一定的参考价值。
[Abstract]:The main bridge of Chongqi Bridge is a six-span two-piece steel box continuous girder bridge with span arrangement of 10 2m 4 脳 185m 102 m / 944 m. Wind tunnel tests have identified the possibility of vertical vortex-induced vibration of the bridge, and in order to stop the possible vortex-induced vibration during the operation period, the wind tunnel test shows that there is a possibility of vertical vortex-induced vibration in the bridge. Compared with active control and passive control, TMD(Tuned Mass damper and tuned mass damper are used to control vibration. The dynamic characteristics of the main bridge are calculated and the wind tunnel test is carried out. The frequency spectrum analysis of the test results shows that the first order vertical antisymmetry is the main vibration mode of vortex-induced vibration. Based on the characteristics of the vibration mode, the position of TMD arrangement is preliminarily determined. The frequency, mass and damping ratio of TMD are preliminarily determined according to the theory and numerical calculation. In order to guide the installation and construction of TMD, the vibration absorption effect of TMD is verified by harmonic response and time history, and the main difficulties and solutions of low frequency TMD design are pointed out. The parameter sensitivity of damping ratio is analyzed, the allowable deviation of main design parameters of TMD is determined, and the acceptance index after installation is put forward. Chongqi Bridge is the first super large bridge to control vortex-induced vibration with TMD in China. The study has accumulated engineering experience for wind-induced vortex-induced vibration control of similar structures, and has certain reference value for the compilation of relevant specifications such as TMD design, inspection and evaluation, manufacture acceptance and so on.
【作者单位】：中交公路规划设计院有限公司;
【分类号】：U448.215

【共引文献】