惯质黏性阻尼器对悬索桥隧道锚减振的影响  

Influence of Inertial‑Viscous Dampers on Vibration Reduction of Suspension Bridge Tunnel‑Type Anchorage

作　　者：杨国俊[1,2] 张树涛 吕明航 杜永峰 唐光武[2] YANG Guojun;ZHANG Shutao;LÜMinghang;DU Yongfeng;TANG Guangwu(School of Civil Engineering,University of Lanzhou Technology Lanzhou,730050,China;State Key Laboratory of Bridge Engineering Structural Dynamic,China Merchants Chongqing Communications Technology Research&Design Institute Co.,Ltd.Chongqing,400067,China)

机构地区：[1]兰州理工大学土木工程学院,兰州730050 [2]招商局重庆交通科研设计院有限公司桥梁工程结构动力学国家重点实验室,重庆400067

出　　处：《振动．测试与诊断》2024年第3期431-438,614,615,共10页Journal of Vibration,Measurement & Diagnosis

基　　金：国家自然科学基金资助项目(51808274,52168042);甘肃省科技计划资助项目(22JR5RA250);中国博士后科学基金资助项目(2019M653897XB)。

摘　　要：为研究隧道锚(tunnel-type anchor,简称TTA)锚岩接触面对动荷载影响的敏感性,寻求一种适用于散索鞍至锚碇缆索处的减振装置。首先,利用有限差分软件建立隧道锚数值模型,监测并分析锚岩接触面共9个测点的速度位移响应;其次,利用滚珠丝杠构件的位移转换放大原理,提出一种适用于前锚室处的惯质黏性阻尼器;最后,利用能量耗散守恒方法,模拟并检验安装该阻尼器后隧道锚的减振效果。结果表明:在动荷载作用下,锚塞体两底角部位测点响应明显大于顶部测点,中部锚岩接触面位移增长较前部与后部更为迅速;隧道锚受低幅值动荷载影响更为明显,动力系数约为1.3,随着荷载幅值的增加,动荷载对于隧道锚的影响会减弱;振动前期较为剧烈,加载0~1 s内剪应变增量增幅明显,后期增量基本不变;设置阻尼器后,锚岩接触面速度位移响应减小,位移减小幅度接近20%,速度响应在1 s内基本衰减至0;阻尼器的减振效果与荷载幅值有关,锚塞体处于中低载荷时,设置阻尼器所带来的减振效果最好,减小效果可以达到24%。To explore the sensitivity of the tunnel-type anchor(TTA)bolt-rock interface to the influence of dynamic loads,a vibration reduction device suitable for the area from the scattered saddle to the tunnel-type anchor cable is sought.A numerical model of the tunnel-type anchor bolt is constructed using finite difference software,and the velocity-displacement responses of nine monitoring points at the anchor rock interface are monitored and analyzed.A displacement amplification principle utilizing ball screw components is employed to propose an inertial viscous damper suitable for the front anchor chamber.Finally,the vibration reduction effect of the tunnel anchor after the installation of this damper is simulated and verified using the conservation of energy dissipation method.The results show that the response of the two bottom corners of the anchor plug body is obviously greater than that of the top,and the displacement of the central anchor rock contact surface increases more rapidly than that of the front and back.The tunnel-type anchor block is more significantly affected by low-amplitude dynamic loads,with a dynamic coefficient of approximately 1.3.As the load amplitude increases,the impact of dynamic loads on the tunnel-type anchor block decreases.The early-stage vibration is more intense,with a noticeable increase in shear strain increments within the first 0~1 s of loading,while the increments remain relatively constant in the later stages.After the damper is installed,the velocity displacement response of the contact surface of the anchor rock decreases obviously,the displacement reduction is close to 20%,and the velocity response basically attenuates to 0 within 1 s.The damping effect of the damper is related to the load amplitude.When the anchor plug body is under medium and low loads,the damping effect is the best,and the reduction effect can reach 24%.

关 键 词：隧道锚 阻尼器 动荷载 动力分析 减振研究 

分 类 号：U448.25[建筑科学—桥梁与隧道工程] TH702[交通运输工程—道路与铁道工程]