高架桥动力模型设计及其振动台台阵试验研究

Scaled Dynamic Model Design and Shaking Table Test of Viaduct

城市高架桥的主要型式是连续桥梁,多跨连续梁桥由于延伸长,跨数多,在研究其抗震性能时,需考虑地震动的空间效应。为了保证数据的可靠性,需要数值模拟与振动台试验相结合,而传统振动台由于数量和尺寸的因素无法进行此类桥梁的振动台试验。设计并制作1∶10几何比例的连续梁桥缩尺模型,利用多子台振动台台阵系统对其进行了水平向振动台试验,识别其动力特性参数,得到了在不同地震波输入下模型加速度、位移和应变响应及其规律,并与数值模拟进行对比,实测数据与计算值吻合的较好。

A continuous beam bridge is the main type of urban viaduct.Dimensional and multi ground motion need to be considered in the study of multi-span continuous bridge because of the longer span and the more cross.It is more effective to perform shaking table tests incorporated with numerical simulation to ensure the reality of the learning.However,these tests are difficutt to conduct due to the scale and number of traditional shaking tables.As a result,a 1∶10scaled model of a viaduct is designed and manufactured to conduct the shaking table test on the multi-shaking table array system under longitudinal and transverse ground motion excitations.Dynamic characteristic parameters are identified,and the dynamic response is measured.A comparison between the FE simulation and the test values is conducted,which shows that in general,both of them are in coincidence with each other.