摘要
摇摆桥墩的损伤和残余位移小,具有良好的震后可恢复性。以预应力双柱式摇摆墩结构体系为研究对象,考虑预应力筋对摇摆刚度的影响,基于拉格朗日方程和动量矩守恒定理给出预应力双柱式摇摆墩的刚体动力分析模型,并进行脉冲型地震动作用下的摇摆谱分析。研究结果表明:在长周期脉冲地震动作用下,预应力筋可以有效减轻低墩的地震反应;随着桥墩高度的增加或地震动频率的增加,预应力筋对桥墩地震反应的影响降低,桥墩依靠自身转动惯量抵抗地震作用;负摇摆刚度既可有效避免桥墩的倒塌,又能减轻脚点处的局部损伤,可在摇摆墩设计时采用。
Rocking bridge piers can exhibit minor damage and residual displacements,displaying superior post-earthquake performance.The rocking response of a double-column rocking bridge system,enhanced with elastic prestressed central tendons,was investigated.Following the Lagrange equation and momentum conservation law,a dynamic analytical model was derived,where the effects of the prestressing force of the tendons were considered.The analytical model was used to construct the rocking spectrum of the post-tensioned double-column rocking bridge system under pulse-type ground motions.The results show that the post-tensioned tendons are effective in reducing the response of the double-column rocking bridge with small columns when subjected to long period excitations.With the increase of the size of the column or the frequency of the excitation,the influence of the tendons on the rocking response becomes marginal,whereas the bridge pier mainly depends on the rotational inertia of their columns to resist the earthquake action.Rocking bridge systems with negative stiffness,which can effectively avoid the collapse of the pier without inducing local damage at pivoting points,can be used in the seismic design of double-column rocking bridge systems.
作者
王宝夫
石钰
石祥锋
张红芬
WANG Baofu;SHI Yu;SHI Xiangfeng;ZHANG Hongfen(Architectural Engineering College,North China Instituteof Science and Technology,Beijing 101601,China;Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China;China Building Materials Academy,Beijing100024,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2022年第10期270-277,共8页
Journal of Vibration and Shock
基金
河北省自然科学基金(E2019508162)
廊坊市科技支撑计划项目(2019013080,2018013022)
中央高校基本科研业务费项目(3142016006)。
关键词
预应力筋
摇摆体系
双柱式桥墩
分析模型
摇摆谱
post-tensioned tendon
rocking system
double-column pier
analytical model
rocking spectrum
