驸马长江大桥非线性静风响应研究

发布时间：2018-06-30 03:52

本文选题：悬索桥 + 静风响应　；参考：《世界桥梁》2016年06期

【摘要】：驸马长江大桥为主跨1 050m的单跨简支梁悬索桥,主梁采用流线型钢箱梁。为研究该桥非线性静风响应,考虑静风荷载非线性和结构几何非线性,采用增量法与内外双重迭代相结合的方法,分析加劲梁初始攻角、附加攻角、缆索风荷载等因素对静风位移、静风失稳风速及结构动力特性的影响,并将计算结果与1∶80全桥气弹模型风洞试验结果进行比较。结果表明:静风位移计算值低于风洞试验实测值,这是静三分力系数的雷诺数效应造成的;缆索风荷载约占结构总体风荷载的15%,不考虑会低估风荷载;不考虑加劲梁附加攻角会高估静风失稳风速;初始攻角、附加攻角、缆索风荷载对加劲梁静风位移响应影响较大;结构动力特性会随风速改变而改变。
[Abstract]:The son-in-law Yangtze River Bridge is a single span simple supported girder suspension bridge with a main span of 1050m. The main girder is streamlined steel box girder. In order to study the nonlinear static wind response of the bridge, considering the nonlinear static wind load and geometric nonlinearity of the structure, the initial angle of attack and the additional angle of attack of the stiffened beam are analyzed by combining the incremental method with the internal and external double iteration method. The effects of cable wind load on static wind displacement static wind instability wind speed and structural dynamic characteristics are compared with the results of the wind tunnel test of the full bridge Aeroelastic model at 1:80. The results show that the calculated value of static wind displacement is lower than the measured value of wind tunnel test, which is caused by the Reynolds number effect of static three-point force coefficient, the wind load of cable is about 15% of the total wind load of the structure, and the wind load will be underestimated without considering the wind load. Considering the additional angle of attack of stiffened beam, the static wind speed will be overestimated; the initial angle of attack, the additional angle of attack and the cable wind load will have a great effect on the static wind displacement response of stiffened beam; the dynamic characteristics of the structure will change with the change of wind speed.
【作者单位】：西南交通大学风工程四川省重点实验室;
【基金】：国家自然科学基金项目(51378442)
【分类号】：U441;U448.25

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