粘滞阻尼器与BRB的混合消能减震研究

发布时间：2018-12-12 22:13

【摘要】：近年来,越来越多的建筑结构采用消能器对结构进行消能减震设计,以粘滞阻尼器与BRB的应用较为广泛,通过合理设计两者在结构中的布置方案,可以得到更加优良的消能减震效果。因此,本文针对粘滞阻尼器与BRB在结构中混合减震的布置方案等方面展开了研究,主要内容如下:1.通过ETABS有限元软件建立30层的框架-核心筒结构模型,并对其分别设置H型钢支撑(加强层)、BRB、粘滞阻尼器得到三种不同的结构体系,对比三种结构体系在多遇、设防、罕遇地震作用下的抗震性能。结果表明:将BRB或粘滞阻尼器设置于框架-核心筒结构中,可以获得比加强层结构更优良的抗震性能;BRB对结构侧向位移的控制效果要优于粘滞阻尼器,但粘滞阻尼器对地震能量的耗散能力大于BRB。2.同时将粘滞阻尼器与BRB设置于上述的框架-核心筒结构中,得到4种不同的混合减震方案,为了与混合减震方案对比,分别设计了仅设置一种阻尼器的粘滞阻尼器结构和BRB结构,将6种减震方案进行多遇、罕遇地震作用下的地震反应对比分析。结果表明:在多遇地震下,混合减震结构的抗震性能介于BRB结构与粘滞阻尼器结构之间;在罕遇地震下,混合减震结构对层间位移角的控制效果优于粘滞阻尼器结构,混合减震结构对基底剪力峰值和顶点最大加速度的控制效果优于BRB结构和粘滞阻尼器结构;在4种混合减震方案中,当以结构的楼层剪力、基底剪力为减震控制目标时,方案1为最优方案,当以结构的层间位移角、顶点位移、顶点加速度为减震控制目标时,方案2为最优方案。3.以14层的框架-剪力墙结构为研究对象,对其同时设置粘滞阻尼器与BRB,得到4种不同的混合减震方案,并且设计了仅设置一种阻尼器的粘滞阻尼器结构和BRB结构。对比6种减震结构在多遇、罕遇地震作用下的地震反应结果。研究表明:在多遇地震下,4种混合减震结构的抗震性能介于BRB结构与粘滞阻尼器结构之间,在4种混合减震结构中,方案2的减震效果最佳;在罕遇地震下,在4种混合减震结构、BRB结构、粘滞阻尼器结构中,方案2对顶点最大位移、最大层间位移角、基底剪力峰值的控制效果最好。4.为了进一步分析粘滞阻尼器与BRB对框架-剪力墙结构的混合减震效果,采用SAP2000有限元软件,将上述的方案2与原结构进行弹塑性时程的对比分析。结果表明:对框架-剪力墙结构采用粘滞阻尼器与BRB的混合减震,不仅可以减少框架的塑性铰数量,而且可以降低塑性铰的破坏程度,但对于剪力墙的混凝土层和钢筋层的最大应力的控制效果并不明显。
[Abstract]:In recent years, more and more building structures use energy dissipators to design energy dissipation and vibration absorption. The viscous dampers and BRB are widely used. Better energy dissipation and damping effect can be obtained. Therefore, in this paper, the arrangement of hybrid damping of viscous dampers and BRB in the structure is studied. The main contents are as follows: 1. A 30-story frame-core tube structure model is established by ETABS finite element software, and H-section steel braces are set up respectively. Three different structural systems are obtained by means of), BRB, viscous dampers of strengthened layer, and the three structural systems are compared in frequent occurrence and fortification. Seismic behavior of rare earthquakes. The results show that when BRB or viscous dampers are placed in the frame-core tube structure, the seismic performance of the structure can be better than that of the strengthened story structure. The control effect of BRB on lateral displacement of structures is better than that of viscous dampers, but the dissipation ability of viscous dampers to seismic energy is greater than that of BRB.2.. At the same time, the viscous damper and BRB are arranged in the frame-core tube structure mentioned above, and four different hybrid shock absorption schemes are obtained. A viscous damper structure and a BRB structure with only one damper are designed, and the seismic responses of six kinds of shock absorption schemes under rare and rare earthquakes are compared and analyzed. The results show that the seismic behavior of hybrid dampers is between BRB structure and viscous damper structure. Under rare earthquake, the control effect of hybrid damping structure on interstory displacement angle is better than that of viscous damper structure, and the control effect of hybrid damping structure on peak value of base shear force and maximum acceleration of vertex is better than that of BRB structure and viscous damper structure. In the four hybrid damping schemes, when the floor shear force and the base shear force of the structure are taken as the damping control target, scheme 1 is the optimal scheme, and when the interstory displacement angle, the vertex displacement and the peak acceleration of the structure are taken as the damping control targets, Option 2 is the best option. Taking the 14-story frame-shear wall structure as the research object, four different hybrid shock absorption schemes are obtained by setting the viscous damper and BRB, simultaneously, and the viscous damper structure and the BRB structure with only one damper are designed. The results of seismic response of 6 kinds of structures under rare and rare earthquakes are compared. The results show that the seismic performance of the four hybrid dampers is between the BRB structure and the viscous damper structure under the frequent earthquake. Among the four hybrid dampers, scheme 2 is the best. In the rare earthquake, among the four kinds of hybrid seismic absorption structure, BRB structure and viscous damper structure, the control effect of scheme 2 is the best for the maximum displacement of the vertex, the maximum displacement angle between layers and the peak value of the base shear force. In order to further analyze the effect of viscous damper and BRB on the hybrid seismic absorption of frame-shear wall structure, the elastoplastic time history of the above scheme 2 is compared with that of the original structure by using SAP2000 finite element software. The results show that the combination of viscous dampers and BRB for frame-shear wall structures can not only reduce the number of plastic hinges, but also reduce the failure degree of plastic hinges. However, the control effect on the maximum stress of concrete and reinforced layer of shear wall is not obvious.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU352.1

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