屈曲约束支撑在高烈度区多高层建筑的应用研究
发布时间：2018-10-24 10:31
【摘要】：08年汶川地震发生后,国家设计规范中进一步明确了 "小震不坏、中震可修、大震不倒"这一抗震设防标准的意义和要求。目前,设计人员通常通过加大结构构件的截面、增加配筋等方法来提高结构自身的抗震能力。然而由于地震作用的随机性与变化性,传统抗震设计方法下该思路难以达到预期的理想效果。屈曲约束支撑作为一种新型消能减震构件,在钢结构和钢筋混凝土结构中得到了广泛的应用。屈曲约束支撑具有能够为结构提供较大的侧向刚度,可以在结构中灵活布置,能够在中震和大震作用下耗散地震能量等优点,在一定程度上解决了传统框架设计过程中抗侧刚度不足与抗震性能不良等问题。本文以一幢位于8度设防区的高层办公楼为例,分别采用两种结构体系进行方案比较,结合建筑功能分别对混凝土框架—屈曲约束支撑结构和混凝土框架—剪力墙结构体系进行设计及抗震分析,得到在符合国家规范要求的框架—剪力墙结构与混凝土框架—屈曲约束支撑布置方案。通过消能减震方案设计,结合PKPM软件对在多遇地震工况下分析其减振效果,论证屈曲约束支撑-混凝土框架这一结构形式在该实例中的可行性,并对这两种结构体系进行经济性分析。通过有限元分析软件对于这两种结构布置方案在罕遇地震作用下的结构响应分析,对结构的抗震性能进行评估。通过分析发现:屈曲约束支撑的受力分析特点为在小震作用下屈曲约束支撑的变形以弹性变形为主,不会发生屈服;在大震作用下进入屈服段,提供耗能效果。相比于框架-剪力墙方案,屈曲约束支撑-框架体系避免400mm厚的剪力墙同时减小了结构构件的尺寸,提升了建筑使用品质,同时节省了造价。通过推覆分析得到两种结构体系在大震作用下的性能点,明确结构体系中的塑性铰分布和构件的破坏情况并进行对比,得到两种结构方案在大震下的抗震性能。通过弹塑性分析发现:框架-剪力墙结构的损伤主要集中与墙体相连的连梁上,同时墙柱出现了较大面积的中度损坏,重度损坏也较多,整体结构破坏较为严重。而对于屈曲约束支撑-框架结构体系,在罕遇地震作用下,只有部分与BRB相连的梁端出现破坏情况,柱子重度损坏的较少,在设计中可以考虑对少部分柱子进行局部加强。此外,文中针对体系层间位移、结构破坏状态等结构性能指标进行对比研究,结合屈曲约束支撑的构造及受力原理,总结了屈曲约束支撑-框架结构体系的设计流程与设计方法,为广大设计人员提供参考。
[Abstract]:After the Wenchuan earthquake occurred in 2008, the significance and requirement of the standard of seismic fortification, "minor earthquake is not bad, moderate earthquake can be repaired, and large earthquake can not be collapsed," has been further defined in the national design code. At present, designers usually increase the seismic capacity of the structure by increasing the cross-section and reinforcement. However, due to the randomness and variability of seismic action, the traditional seismic design method is difficult to achieve the desired results. As a new type of energy dissipation member, buckling restrained braces are widely used in steel structures and reinforced concrete structures. Buckling restrained braces have the advantages of large lateral stiffness, flexible arrangement in the structure, dissipation of seismic energy under the action of moderate and large earthquakes, etc. To some extent, the problems such as insufficient lateral stiffness and poor seismic performance are solved in the traditional frame design process. In this paper, a high-rise office building located in an 8-degree fortification area is taken as an example, and two structural systems are used to compare the schemes. Combined with building function, the design and seismic analysis of concrete frame-buckling braced structure and concrete frame-shear wall structure system are carried out respectively. The frame-shear wall structure and concrete frame-buckling restrained bracing arrangement are obtained in accordance with the requirements of national code. Through the design of energy dissipation and seismic absorption scheme, combined with PKPM software to analyze its vibration absorption effect under the condition of frequent earthquake, the feasibility of buckling restrained brace-concrete frame structure form in this example is demonstrated. And the economic analysis of these two structural systems is carried out. Based on the finite element analysis software, the seismic performance of the two structures is evaluated by analyzing the structural responses of the two structures under rare earthquake. It is found by analysis that the deformation of buckling restrained braces under small earthquakes is mainly elastic deformation and will not yield, and under the action of large earthquakes, the buckling braces enter the yield section to provide energy dissipation effect. Compared with the frame-shear wall scheme, the buckle-constrained brace-frame system avoids the 400mm thick shear wall and reduces the size of the structural member, improves the quality of the building, and saves the cost. Through the push-over analysis, the performance points of the two structural systems under the action of large earthquakes are obtained, and the distribution of plastic hinge and the failure of the members in the structural system are determined and compared, and the seismic behavior of the two structural schemes under the strong earthquake is obtained. Through elastic-plastic analysis, it is found that the damage of frame-shear wall structure is mainly concentrated on the connected beam connected with the wall, and at the same time, the wall column has a large area of moderate damage, the heavy damage is also more serious, and the whole structure damage is more serious. However, for buckling restrained brace-frame structure system, only some beams connected with BRB are damaged under rare earthquake, and the columns are less severely damaged. In the design, a few columns can be partially strengthened. In addition, the structural performance indexes such as interstory displacement, structural failure state and buckling constraint bracing are compared, combined with the structure and stress principle of buckling constraint braces. The design flow and design method of buckling constraint bracing-frame structure system are summarized, which can provide reference for designers.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU352.11
本文编号：2291132
[Abstract]:After the Wenchuan earthquake occurred in 2008, the significance and requirement of the standard of seismic fortification, "minor earthquake is not bad, moderate earthquake can be repaired, and large earthquake can not be collapsed," has been further defined in the national design code. At present, designers usually increase the seismic capacity of the structure by increasing the cross-section and reinforcement. However, due to the randomness and variability of seismic action, the traditional seismic design method is difficult to achieve the desired results. As a new type of energy dissipation member, buckling restrained braces are widely used in steel structures and reinforced concrete structures. Buckling restrained braces have the advantages of large lateral stiffness, flexible arrangement in the structure, dissipation of seismic energy under the action of moderate and large earthquakes, etc. To some extent, the problems such as insufficient lateral stiffness and poor seismic performance are solved in the traditional frame design process. In this paper, a high-rise office building located in an 8-degree fortification area is taken as an example, and two structural systems are used to compare the schemes. Combined with building function, the design and seismic analysis of concrete frame-buckling braced structure and concrete frame-shear wall structure system are carried out respectively. The frame-shear wall structure and concrete frame-buckling restrained bracing arrangement are obtained in accordance with the requirements of national code. Through the design of energy dissipation and seismic absorption scheme, combined with PKPM software to analyze its vibration absorption effect under the condition of frequent earthquake, the feasibility of buckling restrained brace-concrete frame structure form in this example is demonstrated. And the economic analysis of these two structural systems is carried out. Based on the finite element analysis software, the seismic performance of the two structures is evaluated by analyzing the structural responses of the two structures under rare earthquake. It is found by analysis that the deformation of buckling restrained braces under small earthquakes is mainly elastic deformation and will not yield, and under the action of large earthquakes, the buckling braces enter the yield section to provide energy dissipation effect. Compared with the frame-shear wall scheme, the buckle-constrained brace-frame system avoids the 400mm thick shear wall and reduces the size of the structural member, improves the quality of the building, and saves the cost. Through the push-over analysis, the performance points of the two structural systems under the action of large earthquakes are obtained, and the distribution of plastic hinge and the failure of the members in the structural system are determined and compared, and the seismic behavior of the two structural schemes under the strong earthquake is obtained. Through elastic-plastic analysis, it is found that the damage of frame-shear wall structure is mainly concentrated on the connected beam connected with the wall, and at the same time, the wall column has a large area of moderate damage, the heavy damage is also more serious, and the whole structure damage is more serious. However, for buckling restrained brace-frame structure system, only some beams connected with BRB are damaged under rare earthquake, and the columns are less severely damaged. In the design, a few columns can be partially strengthened. In addition, the structural performance indexes such as interstory displacement, structural failure state and buckling constraint bracing are compared, combined with the structure and stress principle of buckling constraint braces. The design flow and design method of buckling constraint bracing-frame structure system are summarized, which can provide reference for designers.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU352.11
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