竖向非平稳地震下巨型框架有控结构动态特性分析
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摘要
巨型框架有控结构是近几年人们较为关注的一种新型抗震结构体系。该结构横向跨度很大,且很多约束被解除,在竖向地震力下其巨型梁动态特性亟需研究。文章提出附加柱数量、次结构楼层数量及巨型梁抗弯刚度是影响巨型梁动力响应的重要参数。基于非平稳地震作用情形,分别研究了这些参数对巨型梁动力特性的影响。通过三维曲面图直观地描述了不同时间段上巨型梁动力响应受各参数影响的规律。研究结果表明:附加柱数量存在优化值,当附加柱数量是满布时数量的20%～30%时,巨型梁动力性能最好;巨结构动力响应随次结构楼层数增多而增大;巨型梁刚度也存在优化值,但作者建议该值应结合结构的竖向承载力来考虑选取。
Aim.To our knowledge,there is no paper in the open literature dealing with calculating the dynamic response described in the title.Section 1 of the full paper gives the serial-parallel model as shown in Fig.2.Section 2 points out that the number of additional columns,the number of storeys of sub-structures and the bending rigidity of mega-beam are the three important parameters that have effects on the dynamic response of the mega-beam.Then Section 2 analyzes their effects respectively.Figs.3(a) and(b) show that when the number of additional columns is 20%～30%of the total number of columns,the vertical dynamic response of the mega-beam is the smallest. Figs.4(a) and(b) indicate that its vertical dynamic response increases with increasing number of storeys of substructures. Figs.5(a) and(b) show that,generally speaking,the increase of the bending rigidity decreases the earthquake resistance of the mega-beam and that,when the rigidity is rather small,it has a short optimal range. The analysis concludes preliminarily that,in designing a mega-beam,an engineer should take into consideration its resistant capacity in the vertical direction.
Aim.To our knowledge,there is no paper in the open literature dealing with calculating the dynamic response described in the title.Section 1 of the full paper gives the serial-parallel model as shown in Fig.2.Section 2 points out that the number of additional columns,the number of storeys of sub-structures and the bending rigidity of mega-beam are the three important parameters that have effects on the dynamic response of the mega-beam.Then Section 2 analyzes their effects respectively.Figs.3(a) and(b) show that when the number of additional columns is 20%～30%of the total number of columns,the vertical dynamic response of the mega-beam is the smallest. Figs.4(a) and(b) indicate that its vertical dynamic response increases with increasing number of storeys of substructures. Figs.5(a) and(b) show that,generally speaking,the increase of the bending rigidity decreases the earthquake resistance of the mega-beam and that,when the rigidity is rather small,it has a short optimal range. The analysis concludes preliminarily that,in designing a mega-beam,an engineer should take into consideration its resistant capacity in the vertical direction.
引文
[1]梁启智,张耀华.巨型框架悬挂体系地震反应特性及阻尼控制研究.华南理工大学学报,1999,27(1):106-110 Liang Qizhi,Zhang Yaohua.Characteristics and Damping Control of Seismic Response of Megaframe with Supension Systems. Journal of South China University of Technology,1999,27(1):106-110(in Chinese)
[2]Zhang Xun'an,Wang Dong,Jiang Jiesheng.The Controlling Mechanism and the Controlling Effectiveness of Passive Mega-Sub- Controlled Frame Subjected to Random Wind Loads.Journal of Sound and Vibration,2005,283:543-560
[3]蓝宗建,田玉基.钢筋混凝土巨型框架多功能减震结构的调频减震原理.工业建筑,2002,32(1):4-6 Lan Zongjian,Tian Yuji.Structure-Control Mechanism of Multifunctional Vibration-Absorption of RC Megaframe Structures.Industrial Construction,2002,32(1):4-6(in Chinese)
[4]连业达,张洵安.地震作用下新结构体系中阻尼器应用.工业建筑,2006,36(2):16 -19 Lian Yeda,Zhang Xun'an.Study on Dampers in New Structural System Subjected to Seismic Loads.Industrial Construction, 2006,36(2):16-19(in Chinese)
[5]Feng M Q.Vibration Control of Tall Buildings Using Mega-Sub Configuration.Journal of Engineering Mechanics,1995,121: 1082-1087
[6]Lian Yeda,Zhang Xun'an,Sheldon Cherry.Damping Characteristics of Friction Damped Braced Frame and Its Effectiveness in the Mega-Sub Controlled Structure System.Earthquake Engineering and Engineering Vibration,2007,6(2):171-181
[7]张洵安,张建霖.子结构刚度对巨型框架减震结构体系的动态特性的影响.西北工业大学学报,2004,22(1):59-63 Zhang Xun'an,Zhang Jianlin.On Improving the Self-Asorption of Shock of Mega-Frame Building.Journal of Northwestern Polytechnical University,2004,22(1):59-63(in Chinese)
[8]连业达,张洵安.巨、子结构质量比对新型有控建筑结构影响研究.振动与冲击,2007,26(8):112-5 Lian Yeda,Zhang Xun'an.Investigation in New Building Structwe with Different Mass Ratio between Mega-Structure and Sub-Structure. Journal of Vibration and Shock,2007,26(8):112-115(in Chinese)
[2]Zhang Xun'an,Wang Dong,Jiang Jiesheng.The Controlling Mechanism and the Controlling Effectiveness of Passive Mega-Sub- Controlled Frame Subjected to Random Wind Loads.Journal of Sound and Vibration,2005,283:543-560
[3]蓝宗建,田玉基.钢筋混凝土巨型框架多功能减震结构的调频减震原理.工业建筑,2002,32(1):4-6 Lan Zongjian,Tian Yuji.Structure-Control Mechanism of Multifunctional Vibration-Absorption of RC Megaframe Structures.Industrial Construction,2002,32(1):4-6(in Chinese)
[4]连业达,张洵安.地震作用下新结构体系中阻尼器应用.工业建筑,2006,36(2):16 -19 Lian Yeda,Zhang Xun'an.Study on Dampers in New Structural System Subjected to Seismic Loads.Industrial Construction, 2006,36(2):16-19(in Chinese)
[5]Feng M Q.Vibration Control of Tall Buildings Using Mega-Sub Configuration.Journal of Engineering Mechanics,1995,121: 1082-1087
[6]Lian Yeda,Zhang Xun'an,Sheldon Cherry.Damping Characteristics of Friction Damped Braced Frame and Its Effectiveness in the Mega-Sub Controlled Structure System.Earthquake Engineering and Engineering Vibration,2007,6(2):171-181
[7]张洵安,张建霖.子结构刚度对巨型框架减震结构体系的动态特性的影响.西北工业大学学报,2004,22(1):59-63 Zhang Xun'an,Zhang Jianlin.On Improving the Self-Asorption of Shock of Mega-Frame Building.Journal of Northwestern Polytechnical University,2004,22(1):59-63(in Chinese)
[8]连业达,张洵安.巨、子结构质量比对新型有控建筑结构影响研究.振动与冲击,2007,26(8):112-5 Lian Yeda,Zhang Xun'an.Investigation in New Building Structwe with Different Mass Ratio between Mega-Structure and Sub-Structure. Journal of Vibration and Shock,2007,26(8):112-115(in Chinese)
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