交通荷载对双井子堡古城墙振动影响的现场实测与数值分析  

Field measurement and numerical analysis of influence of traffic load on vibration of Shuangjingzibao ancient city wall

作　　者：乔雄[1] 刘文高 骆维斌 倪伟淋 杨鑫[1] 黄锦聪 刘锦龙 QIAO Xiong;LIU Wen-gao;LUO Wei-bin;NI Wei-lin;YANG Xin;HUANG Jin-cong;LIU Jin-long(School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Road Construction and Maintenance Technology,Materials and Equipment R&D Center for Transportation Industry,Lanzhou 730050,China)

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050 [2]公路建设养护技术、材料及装备交通运输行业研发中心,甘肃兰州730050

出　　处：《振动工程学报》2023年第3期776-788,共13页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(51769013);甘肃省基础研究创新群体项目(20JR5RA478)。

摘　　要：由于古建筑结构材料特殊、历史悠久且文化内涵丰富,其在交通振动下的动力响应规律研究成为古建筑安全性研究的重要内容。针对古城墙在道路车辆运行影响下的振动高程效应,以及结构的安全性评估问题,基于多种工况开展振动特性的现场测试和振动高程响应机制的理论分析,结合数值模拟方法,并根据相应的安全判据和允许标准进行了研究。结果表明:道路交通荷载影响下古城墙的振动主频率范围为5~25 Hz,城墙顶部振速大于底部振速,顶部的放大系数范围为1.08~2.21,振动放大效应主要受车辆载荷和行驶速度的影响;随着模拟车辆载荷以及行驶速度的增加,城墙质点峰值速度放大系数fPPV增大,振动放大效应明显,fPPV处在1.02~1.77之间。通过对fPPV增量ACI(Amplification Coefficient Increment)进行分析,表明车辆载荷对振动高程效应的影响程度大于车辆速度;对模拟结果以及现场实测数据进行拟合,发现在交通振动激励下城墙底部和顶部的振速存在一定的线性关系;根据现场实测数据与数值模拟结果,对古土城墙的安全性进行了评估,提出了基于通行车辆交通管理的古土城墙防振、减振措施。Due to the special structural materials,long history and rich cultural connotation of ancient buildings,their dynamic response law under traffic vibration has become an important research content of ancient building safety.Aiming at the vibration elevation effect of the ancient city wall under the influence of road vehicles and the safety evaluation of the structure,based on the field test of vibration characteristics under various working conditions and the theoretical analysis of vibration elevation response mechanism,combined with the method of numerical simulation,and according to the corresponding safety criteria and allowable standards,the research is carried out.The results show that the main frequency range of vibration of the ancient city wall under the influence of road traffic load is 5~25 Hz,the vibration speed of the top of the wall is larger than that of the bottom,and the amplification coefficient of the top is 1.08~2.21.The amplification effect of vibration is mainly affected by the load and speed of vehicles.With the increase of simulated vehicle load and driving speed,the peak velocity amplification coefficient fPPV of the wall particle increases,and the vibration amplification effect is obvious,fPPV is between 1.02 and 1.77.The analysis of incremental ACI of fPPV shows that the effect of vehicle load on vibration elevation is greater than that of vehicle speed.By fitting the simulation results and the field measured data,it is found that there is a certain linear relationship between the vibration velocity at the bottom and the top of the wall under the excitation of traffic vibration.According to the field measured data and numerical simulation results,the safety of the ancient earth wall is evaluated,and the anti-vibration measures of the ancient earth wall based on the traffic management of passing vehicles are proposed.

关 键 词：古土城墙 交通振动 现场测试 数值模拟 高程放大效应 

分 类 号：TU361[建筑科学—结构工程]