【摘要】：08年汶川地震發(fā)生后,國家設計規(guī)范中進一步明確了 "小震不壞、中震可修、大震不倒"這一抗震設防標準的意義和要求。目前,設計人員通常通過加大結構構件的截面、增加配筋等方法來提高結構自身的抗震能力。然而由于地震作用的隨機性與變化性,傳統(tǒng)抗震設計方法下該思路難以達到預期的理想效果。屈曲約束支撐作為一種新型消能減震構件,在鋼結構和鋼筋混凝土結構中得到了廣泛的應用。屈曲約束支撐具有能夠為結構提供較大的側向剛度,可以在結構中靈活布置,能夠在中震和大震作用下耗散地震能量等優(yōu)點,在一定程度上解決了傳統(tǒng)框架設計過程中抗側剛度不足與抗震性能不良等問題。本文以一幢位于8度設防區(qū)的高層辦公樓為例,分別采用兩種結構體系進行方案比較,結合建筑功能分別對混凝土框架—屈曲約束支撐結構和混凝土框架—剪力墻結構體系進行設計及抗震分析,得到在符合國家規(guī)范要求的框架—剪力墻結構與混凝土框架—屈曲約束支撐布置方案。通過消能減震方案設計,結合PKPM軟件對在多遇地震工況下分析其減振效果,論證屈曲約束支撐-混凝土框架這一結構形式在該實例中的可行性,并對這兩種結構體系進行經濟性分析。通過有限元分析軟件對于這兩種結構布置方案在罕遇地震作用下的結構響應分析,對結構的抗震性能進行評估。通過分析發(fā)現(xiàn):屈曲約束支撐的受力分析特點為在小震作用下屈曲約束支撐的變形以彈性變形為主,不會發(fā)生屈服;在大震作用下進入屈服段,提供耗能效果。相比于框架-剪力墻方案,屈曲約束支撐-框架體系避免400mm厚的剪力墻同時減小了結構構件的尺寸,提升了建筑使用品質,同時節(jié)省了造價。通過推覆分析得到兩種結構體系在大震作用下的性能點,明確結構體系中的塑性鉸分布和構件的破壞情況并進行對比,得到兩種結構方案在大震下的抗震性能。通過彈塑性分析發(fā)現(xiàn):框架-剪力墻結構的損傷主要集中與墻體相連的連梁上,同時墻柱出現(xiàn)了較大面積的中度損壞,重度損壞也較多,整體結構破壞較為嚴重。而對于屈曲約束支撐-框架結構體系,在罕遇地震作用下,只有部分與BRB相連的梁端出現(xiàn)破壞情況,柱子重度損壞的較少,在設計中可以考慮對少部分柱子進行局部加強。此外,文中針對體系層間位移、結構破壞狀態(tài)等結構性能指標進行對比研究,結合屈曲約束支撐的構造及受力原理,總結了屈曲約束支撐-框架結構體系的設計流程與設計方法,為廣大設計人員提供參考。
[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.
【學位授予單位】：東南大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU352.11

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