摘要
为了探究简支桥梁在可液化场地条件下的倒塌机理,结合实际震害调查,并对量大面广的简支桥梁进行了模拟液化场地下的振动台模型试验,采用持续增强的白噪声和正弦波作为激励,研究了简支桥梁在可液化场地条件下的倒塌机理.结果表明,振动台试验结果能够很好地再现液化现象,桩截面峰值应变位置随着液化的逐渐加深而下移,桩基自振频率随场地液化的逐渐加深而持续降低,而邻桩间距的不断增大会导致桥梁倒塌,试验结果与实际震害现象较为接近.研究对桥梁结构在地震作用下的土-结构相互作用具有一定的参考价值,也为现存类似桥梁的地震安全性评价积累了部分试验资料.
Abstract
In order to study the collapse mechanism of simply supported bridges under liquefiable site conditions,this paper combines the actual earthquake damage investigation and carries out a shaking table model test on the widely used simply supported bridge under simulated liquefaction ground.Continuously enhanced white noise and sine wave excitation were used as the input of the shaking table.The collapse mechanism of the simply supported bridge under liquefaction ground is studied.The results show that the liquefaction phenomenon can be reproduced well by the shaking table test.The maximum strain position and the natural frequency of the piles decrease with the increasing liquefaction,and the increasing relative displacement between adjacent piles will lead to the bridge collapse.The damage mode of the experimental results is close to that of the actual seismic phenomena.This paper can provide a significant reference for the study of soil-structural interaction under earthquakes and also accumulate the experimental data for the seismic safety evaluation of existing similar bridges.
基金项目
绿色建筑与装配式建造安徽省重点实验室开放基金(2022-JKYL-001)
安徽省住房城乡建设科学技术计划(2023-YF080)
安徽省住房城乡建设科学技术计划(2022-YF164)
NETL
NSTL
万方数据