大跨结构的地震模拟振动台试验常因台面尺寸的影响而采用小比例模型,再加上材料的力学性能往往难以满足配重要求从而使试验变得比较困难,因而不得不选用欠质量试验模型作为研究对象。根据万州长江大桥跨长的特点,以1∶100欠质量模型为研究对象,进行了地震模拟振动台试验和三维有限元分析,通过实测值和理论值的对比分析,得出了正确的计算模型和动力分析方法,为该桥的进一步研究奠定了可靠的基础。

Shaking Table Test Research on Insufficient-mass Model of Wanzhou Yangtze River BridgeQU Wei-lian~1,SUN Wu-yi~(1,2),ZHOU Qiang~1(1. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China;2. School of Engineering, China University of Geosciences, Wuhan 430074, China)The shaking table test researches on aseismic behaviors of large-span structures often adopt small-scale models because of the influences of table sizes, moreover, the mechanical performances of materials frequently fail to meet the demands of loads. These facts usually result in difficulties in such tests, so insufficient-mass models have to be chosen as the objects in these tests consequently. In view of the large-span structure of the Wanzhou Yangtze River Bridge, a 1∶100 scale insufficient-mass model was examined by the 3-D finite element analyses and tested on the shaking table. This paper analyzed and compared the experimental values and theoretical values, and presented a correct calculation model and a dynamic analysis approach which would lay a solid foundation for further researches into the bridge.shaking table test; analogical relationship; insufficient-mass model; dynamical reaction