蓝海风中心办公楼动力特性的原位测试及分析
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摘要
对重要建筑物的动力特性进行原位测试,获得其动力特性参数,可为日后的安全评估或灾后检测积累基础数据,也可为同类建筑物的设计提供参考。采用脉动法对西安一幢新建的超高层建筑——蓝海风中心办公楼的动力特性进行了原位测试,利用各层采集的时域脉动信号,按平均周期图方法对长时记录分多段进行自谱分析或互谱分析,识别出了该结构两个主轴水平向前三阶振型和自振周期、绕竖轴扭转的前三阶周期及竖向的一阶周期,通过半功率带宽法获得了结构的水平向前三阶阻尼比。结果表明:结构的横向基本周期为2.212s,各阶周期比基本处于经验范围之内。振型曲线光滑连续无较大的突变,零点位置符合经验规律。在环境随机激振下,结构水平向前三阶实测阻尼比在2.2%以下,符合规律。
To accumulate the basic data for the future safety assessment and the post-disaster detection,as well as provide relevant references for the designing of similar buildings,we can acquire the parameters about dynamic characteristics through in situ test of dynamic characteristic of significant buildings.Dynamic characteristics of a new super high-rise building in Xi'anLafonce office building are tested in situ by the pulsating method,with the collected time-domain pulsating signals from each floor and the average periodic diagram method used for a long time record of the multi-segment for auto-spectrum analysis or the cross-spectrum analysis,identifying the first three modes and natural vibration periods along the two main axes,the first three natural vibration periods along the vertical shaft torsional,and the first natural vibration period along the vertical direction.The first three damping ratios are obtained by the half-power bandwidth method.The results show that the fundamental period of the structure in transverse direction is 2.212 s,and that each periodic ratio is basically within the empirical scope.The modal curves are smooth and continuous without obvious mutation with the zero-position in accord with the empirical rules.In the random excitation of environment,the first three damping ratios of the structure are below 2.2%in the horizontal direction in accord with the rule.
To accumulate the basic data for the future safety assessment and the post-disaster detection,as well as provide relevant references for the designing of similar buildings,we can acquire the parameters about dynamic characteristics through in situ test of dynamic characteristic of significant buildings.Dynamic characteristics of a new super high-rise building in Xi'anLafonce office building are tested in situ by the pulsating method,with the collected time-domain pulsating signals from each floor and the average periodic diagram method used for a long time record of the multi-segment for auto-spectrum analysis or the cross-spectrum analysis,identifying the first three modes and natural vibration periods along the two main axes,the first three natural vibration periods along the vertical shaft torsional,and the first natural vibration period along the vertical direction.The first three damping ratios are obtained by the half-power bandwidth method.The results show that the fundamental period of the structure in transverse direction is 2.212 s,and that each periodic ratio is basically within the empirical scope.The modal curves are smooth and continuous without obvious mutation with the zero-position in accord with the empirical rules.In the random excitation of environment,the first three damping ratios of the structure are below 2.2%in the horizontal direction in accord with the rule.
引文
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[2]DIPASQUALE E,CAKMAK A S.On the relation between local and global damage indices[R].National Center for Earthquake Engineering Research,2009.
[3]李星新,贺国京,黄智慧,等.建筑结构振动安全性研究[J].世界地震工程,2007,23(4):234-238.LI Xingxin,HE Guojing,HUANG Zhihui,et al.Research on vibration safety of auxiliary plant[J].World Earthquake Engineering,2007,23(4):234-238.
[4]施卫星,魏丹,韩瑞龙.钢结构房屋动力特性脉动法测试研究[J].地震工程与工程振动,2012,32(1):114-120.SHI Weixing,WEI Dan,HAN Ruilong.Field tests and research on the dynamic characteristics of steel structure buildings under ambient vibration[J].Earthquake Engineering and Engineering Vibration,2012,32(1):114-120.
[5]中华人民共和国住房和城乡建设部.高层建筑混凝土结构技术规程:JGJ3—2010[S].北京:中国建筑工业出版社,2010.
[6]王济,胡晓.MATLAB在振动信号处理中的应用[M].北京:中国水利水电出版社,2006.
[7]LI Peng,MA Fu.Based on the test of dynamic characteristics of the structure retrofit design[J].Applied Mechanics and Materials,2012,226-228:1102-1105.
[8]陶磊,张俊发,周颖.某框剪结构震前、震后动力特性测试及分析[J].建筑结构,2009,39(11):78-80.TAO Lei,ZHANG Junfa,ZHOU Ying.Testing and analysis on dynamic behavior of a frame-shear wall structure before and after earthquake[J].Building Structure,2009,39(11):78-80.
[9]YANG J N,LEI Y,LIN S,et al.Identification of natural frequencies and dampings of in situ tall buildings using ambient wind vibration data[J].Journal of Engineering Mechanics,2004,130(5):570-577.
[10]刘佩,连鹏宇.基于环境振动测试的框架结构主裙楼动力特性分析[J].振动与冲击,2016,35(10):174-179.LIU Pei,LIAN Pengyu.Dynamic characteristics analysis of a frame structure with the main building and podium based on ambient vibration test data[J].Journal of Vibration and Shock,2016,35(10):174-179.
[11]李国胜.混凝土结构设计禁忌及实例[M].北京:中国建筑工业出版社,2012:14-15.
[12]郭仁俊.高层建筑框架—剪力墙结构设计[M].北京:中国建筑工业出版社,2004:107-108.
[13]霍达.高层建筑结构设计[M].北京:高等教育出版社,2004:148-149.
[14]CHOPRA A K.Dynamics of structures theory and applications to earthquake engineering:2nd ed[M].影印本.北京:清华大学出版社,2005:447-450.