水平初位移下基础隔震结构现场动力特性测试  

Field dynamic characteristics testing of foundation isolation structures under horizontal initial displacement

作　　者：吴应雄[1] 董昕珺 廖文彬 林友勤[1] 唐贞云[3] 郑国琛[4] 商昊江 WU Ying-xiong;DONG Xin-jun;LIAO Wen-bin;LIN You-qin;TANG Zhen-yun;ZHENG Guo-chen;SHANG Hao-jiang(College of Civil Engineering,Fuzhou University,Fuzhou 350108,China;Fujian Provincial Institute of Architectural Design and Research Co.,Ltd.,Fuzhou 350100,China;The Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China;College of Engineering,Fujian Jiangxia University,Fuzhou 350108,China;Fujian Academy of Building Research Co.,Ltd.,Fuzhou 350100,China)

机构地区：[1]福州大学土木工程学院,福建福州350108 [2]福建省建筑设计研究院有限公司,福建福州350100 [3]北京工业大学城市与工程安全减灾教育部重点试验室,北京100124 [4]福建江夏学院工程学院,福建福州350108 [5]福建省建筑科学研究院有限责任公司,福建福州350100

出　　处：《振动工程学报》2024年第4期578-587,共10页Journal of Vibration Engineering

基　　金：福建省住房和城乡建设厅科技研究开发项目(2022-k-136);厦门市建设与管理局科技项目(厦建科[2014]21号-1号);福建省自然科学基金资助项目(2020J01940)。

摘　　要：应用被动控制技术建成的隔震建筑,其隔震性能缺乏检测手段,因此进行隔震结构动力特性的现场测试具有重要意义。现场测试1栋4层基础隔震幼儿园,展示了试验装置、方法及所得结果,将结果与同条件下非隔震结构模型进行对比分析,探究实际隔震结构动力响应规律及减震效果。用液压千斤顶将建筑物推开使隔震层产生98 mm(对应LNR500剪应变102%)水平初位移,安装混凝土顶杆支撑建筑物;利用炸药将顶杆爆破卸载使建筑物做自由振动;最后测试和分析其动力响应等参数。分析结果表明:水平初位移条件下,隔震结构的一阶自振周期比非隔震结构显著延长,阻尼比增大;隔震层滞回曲线饱满;各楼层动力响应控制效果明显,但观察到屋顶层相比底层加速度略有放大;卸载后隔震层瞬间复位,表明隔震层具有瞬间复位特性。There is a lack of detection means for the isolation performance of the buildings built by passive control technology,so it is of great significance to test the dynamic characteristics of the isolated structures on the spot.A 4-story base isolation kindergarten was tested in the field,and the test device,method and results were displayed.The results were compared with the seismic structure model under the same conditions,and the dynamic response law and damping effect of the actual isolation structure were explored.The building was pushed away with hydraulic jack to produce 98 mm(corresponding to LNR500 shear strain 102%)horizontal initial displacement of the isolation layer,and concrete jacking rod was installed to support the building;The concrete rod was blasted with explosives and unloaded instantly to make the building vibrate freely;The dynamic response and other parameters were tested and analyzed.The results show that under the condition of horizontal initial displacement,the first-order natural vibration period of the isolated structure is significantly longer than that of the seismic structure,and the damping ratio increases;The hysteretic curve of the isolation layer is full;The dynamic response control effect of each floor is obvious,but the acceleration of the roof floor is slightly amplified compared with that of the bottom floor;After unloading,the isolation layer instantly resets,which shows that the isolation layer has rapid reset performance.

关 键 词：基础隔震 水平初位移 动力特性 滞回特性 复位特性 

分 类 号：TU352.1[建筑科学—结构工程]