半刚性悬挂结构体系减振避震机理及参数优化
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摘要
提出了一种新型悬挂结构体系——半刚性悬挂结构体系。该结构体系在悬挂楼段与转换层之间设置半刚性层,其间设置减振阻尼装置。通过时域内输入El Centro波、Taft波以及人工波,验证了该体系具有良好的动力响应特性。根据随机振动理论,在复数域内推导了体系的随机振动响应表达式;以主体核筒结构顶点位移和半刚性层的层间位移为目标函数,编制了MATLAB计算程序,对体系中影响结构动力响应的阻尼器的刚度和阻尼、悬挂质量比及半刚性连接的转动刚度等进行参数分析。计算结果表明:该体系能够有效减小地震动力响应,半刚性层的层间位移较大,主体结构顶点位移和悬挂楼层的层间位移较小;对于文中给出的结构算例存在最优参数组合:阻尼器刚度和阻尼分别为1×107N/m和1×107N.s/m,悬挂质量比取3.0,半刚性连接转动刚度为3.14×104N.m/rad;当半刚性悬挂结构的参数取得最优组合时,主体结构动力响应和半刚性层层间位移均可得到较好的控制,结构的减振避震性能明显提高。
A novel suspended structure system,namely semi-rigid suspended structure,was presented in this paper.The semi-rigid stories were set between suspended segments and transfer stories,and vibration absorption dampers were installed.The El Centro,Taft and artificial seismic waves were used to calculate the dynamic characteristics of the system in the time domain,of which dynamic responses were proved satisfactory.Based on the random vibration theory,random seismic responses of the structure system were derived in complex field.The structural parameter optimization analysis of the stiffness and damping coefficient of dampers,the suspended mass ratio and the rotational stiffness of semi-rigid connection were performed with MATLAB by taking the top floor displacement of the primary core-tube structure and the inter-story displacement of the semi-rigid story as objective function.The results show that the seismic responses of this novel structure can be reduced effectively,with relatively larger inter-storey displacement in the semi-rigid stories and relatively smaller inter-story displacements in the top floor displacement of primary structure and in the suspended stories.The optimal parameter combination of the calculation example in this paper is the stiffness and damp of dampers set as 1 × 107N/m and 1 × 107 N.s/m respectively;suspended mass ratio set as 3.0;the rotational stiffness of semi-rigid connections set as 3.14 × 104N.m/rad.When the structural parameters are optimal value,the seismic responses of the primary structure and inter-story displacement of semi-rigid story can be well controlled,and the earthquake avoidance performance of the structure is improve obviously.
A novel suspended structure system,namely semi-rigid suspended structure,was presented in this paper.The semi-rigid stories were set between suspended segments and transfer stories,and vibration absorption dampers were installed.The El Centro,Taft and artificial seismic waves were used to calculate the dynamic characteristics of the system in the time domain,of which dynamic responses were proved satisfactory.Based on the random vibration theory,random seismic responses of the structure system were derived in complex field.The structural parameter optimization analysis of the stiffness and damping coefficient of dampers,the suspended mass ratio and the rotational stiffness of semi-rigid connection were performed with MATLAB by taking the top floor displacement of the primary core-tube structure and the inter-story displacement of the semi-rigid story as objective function.The results show that the seismic responses of this novel structure can be reduced effectively,with relatively larger inter-storey displacement in the semi-rigid stories and relatively smaller inter-story displacements in the top floor displacement of primary structure and in the suspended stories.The optimal parameter combination of the calculation example in this paper is the stiffness and damp of dampers set as 1 × 107N/m and 1 × 107 N.s/m respectively;suspended mass ratio set as 3.0;the rotational stiffness of semi-rigid connections set as 3.14 × 104N.m/rad.When the structural parameters are optimal value,the seismic responses of the primary structure and inter-story displacement of semi-rigid story can be well controlled,and the earthquake avoidance performance of the structure is improve obviously.
引文
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[15]徐国栋,周锡元,董娣,等.强震地面运动的超随机特性研究[J].地震工程与工程振动,2005,25(2):1-9.(Xu Guodong,Zhou Xiyuan,Dong Di,et al.A casestudy on the super-randomness of strong ground motion[J].Earthquake Engineering and Engineering Vibration,2005,25(2):1-9.(in Chinese))
[2]Lan Z J,Tian Y J,Fang L,et al.An experimental studyon seismic responses of multifunctional vibration-absorption reinforced concrete mega-frame structures[J].Earthquake Engineering and Structural Dynamics,2004,33(1):1-14.
[3]张晖,朱伯龙,苏少军.悬挂结构层间减震控制系统试验及分析[J].建筑结构学报,1997,18(5):59-65.(ZHANG Hui,ZHU Bolong,SU Shaojun.Research on vibration absorption control system ofsuspension structure[J].Journal of Building Structures,1997,18(5):59-65.(in Chinese))
[4]涂永明,张继文,吕志涛,等.悬挂建筑减振体系次结构的抗震性能[J].东南大学学报:自然科学版,2008,38(6):1099-1104.(Tu Yongming,ZhangJiwen,LüZhitao,et al.Lateral performance ofsubstructure of suspended vibration absorption system[J].Journal of Southeast University:Natural ScienceEdition,2008,38(6):1099-1104.(in Chinese))
[5]曹万林,卢智成,张建伟,等.核心筒部分悬挂结构振动台试验及分析[J].土木工程学报,2007,40(3):40-44.(Cao Wanlin,Lu Zhicheng,ZhangJianwei,et al.Shaking table test and analysis of core-tube partial suspension structures[J].China Civil Engineering Journal,2007,40(3):40-44.(in Chinese))
[6]王肇民,邓洪洲,董军.高层巨型框架悬挂结构体系抗震性能研究[J].建筑结构学报,1999,20(1):23-30.(WANG Zhaomin,DENG Hongzhou,DONG Jun.A study of aseismic properties of huge frame suspendedstructure in tall buildings[J].Journal of Building Structures,1999,20(1):23-30.(in Chinese))
[7]邓志恒,秦荣.巨型框筒部分悬挂结构控制体系地震反应特性及阻尼控制研究[J].地震工程与工程振动,2002,22(4):133-138.(Deng Zhiheng,QinRong.Study on characteristics of seismic response anddamping control for mega-frame tube with partialsuspension systems[J].Earthquake Engineering and Engineering Vibration,2002,22(4):133-138.(in Chinese))
[8]Rodney Jones.Photo of standard bank centre[OL].http://www.emporis.com/en/il/im/?id=226645,2009-11-16.
[9]Linda Hsu.Muchen的BMW大楼[OL].http://www.flickr.com/photos/64008109@N00/3693595840,2009-07-06.
[10]Demirtas B,De Santiago E,O'leary J R.Classificationof steel semi-rigid connections by neural networks[J].Journal of Structural Engineering,1998,124(7):736-759.
[11]沃尔夫冈.许勒尔.竖向建筑结构手册[M].北京:中国建筑工业出版社,2002:465-466.(WolfgangSchueller.Vertical building structure[M].Beijing:China Architecture&Building Press,2002:465-466.(in Chinese))
[12]程文瀼,隋杰英,陈月明,等.宿迁市交通大厦采用粘弹性阻尼器的减震设计与研究[J].建筑结构学报,2000,21(3):30-35.(CHENG Wenrang,SUI Jieying,CHEN Yueming,et al.Design and study on earthquakeabsorption using viscoelastic damper in transportationbuilding of Suqian City[J].2000,21(3):30-35.(in Chinese))
[13]周坚,伍孝波.核筒悬挂结构体系自振特性研究[J].工程力学,2005,22(1):75-81.(Zhou Jian,WuXiaobo.A study of model-frequency behavior of core-wall suspension structures[J].Engineering Mechanics,2005,22(1):75-81.(in Chinese))
[14]涂永明.CFRP索悬挂建筑结构静力和动力分析及研究[D].南京:东南大学,2005.(Tu Yongming.Study on the static and dynamic mechanisms of CFRPcable suspended building structures[D].Nanjing:Southeast University,2005.(in Chinese))
[15]徐国栋,周锡元,董娣,等.强震地面运动的超随机特性研究[J].地震工程与工程振动,2005,25(2):1-9.(Xu Guodong,Zhou Xiyuan,Dong Di,et al.A casestudy on the super-randomness of strong ground motion[J].Earthquake Engineering and Engineering Vibration,2005,25(2):1-9.(in Chinese))
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