【摘要】 为了了解动水效应对桩墩结构体系的影响以及完善桥梁结构的抗震设计方法,进行了水下桩墩结构模型体系的动力试验。从模型设计、试验装置和加载工况3个方面介绍了试验的实施过程。通过观察模型破坏形态和分析试验结果,探讨了动水压力对结构体系动力特性和地震响应的影响并且检验了应用该动力模型试验研究的适用性。试验结果表明:模型在水中的自振频率比无水时有所降低;动水压力的大小与输入的加速度峰值有关并且在相同的峰值加速度下沿模型从上到下依次递增;试验结果满足预期目的,证实了试验方案的有效性。更多还原

【Abstract】 In order to understand the effect of hydrodynamic pressure and improve the seismic design technology of bridges,the vibration test on a submerged pile-pier system model is conducted.The experimental implementation process is introduced including model design,experimental equipment and loading program.By observing the failure mode of model and analysing the experimental results,the effect of hydrodynamic pressure on dynamic characteristics and seismic responses of structure system is investigated.The applicability of this test is also examined.Test results indicate that the natural frequency without water is always higher than that with water.It is also concluded that the hydrodynamic pressure value is related to the peak acceleration and increases along the height of model.Besides,the experimental results meet the expected requirement,which prove the efficiency of experimental plan.The level of failure tends to serious and the dynamic magnification factors show a decreasing tendency towards the enlarged amplitudes of wave input.更多还原