桥墩与水相互作用的振动台试验

以南京长江三桥南塔墩作为工程背景,并按照1:50的相似比设计出桥墩的模型,并选取正弦波和天津波作为加载的波形,在无水与有水两种状态下开展了振动台试验.试验数据表明,承台部分的加速度视加载波形峰值的不同有20%到40%的增幅,位移、应变等也有相应的增幅.通过试验得出的动水压力沿高程分布图表明,动水压力的分布与地震波强度明显相关.

Shaking table test of pier-water intereaction

Taking the Third Nanjing Yangtze River Bridge as an engineering background,a pile-cap pier model was designed and built by using the similar principles with a scale factor of 1∶50. A shaking table test of this pier model was carried out by loading a sine wave and Tianjin wave in the two cases around water and around air. The result showed that the largest rate of acceleration increased from 20% to 40% under different waves,and the displacement and strain increased accordingly. The curves of earthquake hydrodynamic pressure along pile height indicated that the distribution of pressure was relevant to the intensity of earthquake waves.