大底盘双塔楼高层建筑的随机振动测试及模型修正研究
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摘要
利用环境随机激励,对深圳一座27层框架-剪力墙结构的大底盘连体双塔高层商业住宅楼模态进行测试,得到该结构平动及扭转模态测试结果。采用PKPM软件中SATWE模块对该结构建模分析,计算得到结构的固有频率和模态振型。经过与各国计算高层建筑的基本周期的经验公式相比较,发现实测结构的自振频率比理论计算的自振频率要大,同时大于各国规范经验公式的估计值,说明该结构的实际刚度较大或实际质量较小。通过考虑地下室的影响以及减小楼面活载和恒载的初步模型修正,以及把填充墙作为等效斜撑的详细模型修正和对等效斜撑有效宽度的优化,修正后的计算固有频率和实测固有频率基本符合,说明本文方法可用于高层建筑结构模型修正。
A modal experiment of a full-scale 27 story frame-shear wall high-rise building structure was conducted, using ambient vibration measurements. The building consists of two towers connected by air corridors and an enlarged base. The natural frequencies, translation and torsion mode shapes were measured, and the analytical natural frequencies and mode shapes were obtained by using the SATWE module of the software, PKPM. In comparison with the empirical formulas for calculation of the fundamental frequency of tall buildings in different countries, it is found that the measured fundamental frequency of the structure is higher than the calculated and empirically-evaluated fundamental frequency, indicating either the stiffness of the structure larger than that of the analytical model or the mass of the structure smaller than that of the analytical model. By considering the stiffness effect of the basement of the structure and the actual load on the floors, a primary model update was conducted. Then the infill-wall was modeled as an equivalent inclined brace and its width was optimized in the final model updating. After model updating, the calculated natural frequencies agree well with the measured data, illustrating that the method can be used in model updating of high-rise building structures.
A modal experiment of a full-scale 27 story frame-shear wall high-rise building structure was conducted, using ambient vibration measurements. The building consists of two towers connected by air corridors and an enlarged base. The natural frequencies, translation and torsion mode shapes were measured, and the analytical natural frequencies and mode shapes were obtained by using the SATWE module of the software, PKPM. In comparison with the empirical formulas for calculation of the fundamental frequency of tall buildings in different countries, it is found that the measured fundamental frequency of the structure is higher than the calculated and empirically-evaluated fundamental frequency, indicating either the stiffness of the structure larger than that of the analytical model or the mass of the structure smaller than that of the analytical model. By considering the stiffness effect of the basement of the structure and the actual load on the floors, a primary model update was conducted. Then the infill-wall was modeled as an equivalent inclined brace and its width was optimized in the final model updating. After model updating, the calculated natural frequencies agree well with the measured data, illustrating that the method can be used in model updating of high-rise building structures.
引文
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[2]Brownjohn J M W.Ambient vibration studies for system identification of tall buildings[J].Earthquake Engin-eering and Structural Dynamics,2003,32(1):71-95
[3]Li Q S,Wu J R.Correlation of dynamic characteristics of a super-tall building from full-scale measurements and numerical analysis with various finite element models[J].Earthquake Engineering and Structural Dynamics,2004,33(14):1311-1336
[4]Wu J R,Li Q S.Finite element model updating for a high-rise structure based on ambient vibration measurements[J].Engineering Structures,2004,26(7):979-990
[5]Chassiakos A G,Masri S F,Nayeri R D,et al.Use of vibration monitoring data to track structural changes in a retrofitted building[J].Structural Control and Health Monitoring,2007,14(2):218-238
[6]Chaker A A,Cherifati A.Influence of masonry infill panels on the vibration and stiffness characteristics of R/C frame buildings[J].Earthquake Engineering and Structural Dynamics,1999,28(9):1061-1065
[7]Thiruvengadam V.On the natural frequencies of infilled frames[J].Earthquake Engineering and Structural Dynamic,1985,13(3):401-419
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[9]Amanat K M,Hoque E.A rationale for determining the natural period of RC building frames having infill[J].Engineering Structures,2006,28(4):495-502
[10]冶金工业部建筑研究总院工程抗震研究室.九国抗震设计规范汇编[M].北京:地震出版社,1982
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[12]李常青.填充墙框架结构动力模型修正研究[D].长沙:湖南大学,2004(Li Changqing.Dynamic model modification of infilled frame[D].Changsha:Hunan University,2004(in Chinese))
[13]秦鹏.框架填充墙结构的动力试验与研究[D].长沙:湖南大学,2004(Qin Peng.Dynamic experiment and analytical study of infilled frames[D].Changsha:Hunan University,2004(in Chinese))
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