本文選題：鋼框架 + 帶豎縫填充墻��； 參考：《沈陽建筑大學(xué)》2015年碩士論文

【摘要】：鋼框架結(jié)構(gòu)具有良好的延性,抗震性能優(yōu)異,且具有輕質(zhì)高強(qiáng)、施工周期短、工業(yè)化程度高等特點(diǎn)。近些年來,隨著國家大力推廣綠色節(jié)能建筑,鋼結(jié)構(gòu)住宅逐步興起。填充墻是鋼框架結(jié)構(gòu)建筑中不可缺少的維護(hù)結(jié)構(gòu)部件,在傳統(tǒng)設(shè)計(jì)計(jì)算中填充墻在結(jié)構(gòu)體系中不考慮其受力影響,只起到圍護(hù)和分割房間的作用。忽略填充墻體對結(jié)構(gòu)的作用影響,這與該結(jié)構(gòu)體系的實(shí)際受力狀態(tài)是不符的,尤其是在地震作用下填充墻體由于其較大的抗側(cè)剛度以及墻體材料的脆性性能,往往導(dǎo)致其較早發(fā)生破壞,在歷次大的地震中,往往出現(xiàn)框架主體還未出現(xiàn)破壞但填充墻體卻已破壞嚴(yán)重,對人們的生命及財(cái)產(chǎn)造成極大的損失。實(shí)際上框架填充墻除了起到維護(hù)和分隔房間的作用外,從結(jié)構(gòu)角度看,當(dāng)框架受水平力時(shí),鋼框架與墻體有明顯的組合受力作用,并且填充墻體對結(jié)構(gòu)的抗側(cè)向剛度影響較大。隨著人們對建筑結(jié)構(gòu)可靠性要求的不斷提高,非結(jié)構(gòu)構(gòu)件的抗震性能越來越多的引起人們的重視。根據(jù)這一問題本文提出一種新型的填充墻耗能措施,通過對填充墻體設(shè)置豎向通縫來實(shí)現(xiàn)墻體大震作用下的剛度迅速退化的目標(biāo),從而減輕填充墻體與鋼框架之間的相互作用,延遲墻體的破壞時(shí)間,使結(jié)構(gòu)具備一定的耗能性能,從而減輕在地震作用下結(jié)構(gòu)的響應(yīng),防止填充墻體等非結(jié)構(gòu)構(gòu)件過早發(fā)生嚴(yán)重的破壞。本文利用ABAQUS大型有限元軟件分別建立了剛性連接框架、柔性連接框架和純鋼框架三種模型,用彈簧模擬框架柱與填充墻間豎縫處的拉結(jié)筋作用,分別對這三種模型進(jìn)行了無軸力和軸壓應(yīng)力比為0.2時(shí)的單向加載和低周往復(fù)加載的模擬,提取了模型的單調(diào)荷載位移曲線、剛度退化曲線、滯回曲線和骨架曲線來分析不同因素對該種結(jié)構(gòu)抗震性能的影響。為了進(jìn)一步研究設(shè)縫數(shù)量(單片墻體的高寬比)對結(jié)構(gòu)抗震性能影響,在前述研究的基礎(chǔ)上又建立了改變墻體高寬比的設(shè)縫模型與柔性連接模型、剛性連接模型及純鋼框架模型,并進(jìn)行數(shù)值分析對比,通過研究可知墻體設(shè)縫數(shù)量和高寬比的變化對結(jié)構(gòu)的剛度、承載力及耗能性能均有很大影響,墻體設(shè)縫越多,單片墻體的高寬比越大,結(jié)構(gòu)整體的剛度削弱越大,框架的水平承載力越低,延性和耗能性能越好,但應(yīng)避免過多設(shè)縫使墻體剛度削弱過多,導(dǎo)致結(jié)構(gòu)的抗側(cè)剛度及水平承載力顯著降低,墻體不能很好發(fā)揮抗側(cè)力性能。本文還對設(shè)縫的四種結(jié)構(gòu)分析模型的連接彈簧剛度進(jìn)行了改變,以考察實(shí)際工程中不同拉結(jié)鋼筋間距對設(shè)縫模型抗震性能影響,分析認(rèn)為彈簧剛度的增大對高寬比小于1.2的設(shè)縫模型影響作用明顯,彈簧剛度越大,承載力提高越明顯。
[Abstract]:Steel frame structure has good ductility, excellent seismic performance, light and high strength, short construction period, high degree of industrialization and so on. In recent years, with the national efforts to promote green energy-saving buildings, steel-structure housing is gradually rising. The infilled wall is an indispensable part of the maintenance structure in the steel frame structure. In the traditional design calculation, the infill wall does not consider its force effect in the structural system, only plays the role of protecting and dividing the room. The effect of the filled wall on the structure is ignored, which is inconsistent with the actual stress state of the structure system, especially because of its larger lateral stiffness and brittleness of the wall material under seismic action. It often leads to early damage, in the past major earthquakes, there is often no damage to the main frame, but the wall has been seriously damaged, causing great loss to people's lives and property. In fact, in addition to maintaining and separating the room, the frame infilled wall has obvious combined force when the frame is subjected to horizontal force, and the infilled wall has a great influence on the lateral stiffness of the structure. With the increasing demands on the reliability of building structures, more and more attention has been paid to the seismic behavior of non-structural members. According to this problem, a new type of energy dissipation measure for infilled wall is proposed in this paper. By setting vertical joint on filled wall to realize the goal of rapid degradation of stiffness under the action of large earthquake, the interaction between infilled wall and steel frame can be alleviated. By delaying the failure time of the wall, the structure has a certain energy dissipation performance, which can reduce the response of the structure under earthquake, and prevent the serious damage of the non-structural members such as the filled wall. In this paper, three kinds of models of rigid connection frame, flexible connection frame and pure steel frame are established by using ABAQUS software, and the effect of tension and reinforcement on vertical joint between frame column and infilled wall is simulated by spring. The three models are simulated by unidirectional loading and low cycle reciprocating loading with no axial force and axial compression stress ratio of 0.2. The monotone load-displacement curves and stiffness degradation curves of the models are extracted. The hysteretic curve and skeleton curve are used to analyze the influence of different factors on the seismic performance of this kind of structure. In order to further study the effect of the number of joints (the aspect ratio of a single wall) on the seismic performance of the structure, a joint model and a flexible connection model are established to change the aspect ratio of the wall. The rigid connection model and the pure steel frame model are analyzed and compared. Through the study, it can be seen that the changes of the number of wall joints and the ratio of height to width have great influence on the stiffness, bearing capacity and energy dissipation performance of the structure, and the more joints are set up, the more the wall joints are. The greater the aspect ratio of a single wall, the greater the stiffness of the whole structure, the lower the horizontal bearing capacity of the frame, the better the ductility and energy dissipation performance, but it is necessary to avoid too many joints to weaken the stiffness of the wall. As a result, the lateral stiffness and horizontal bearing capacity of the structure are significantly reduced, and the wall can not give full play to the lateral force resistance. In this paper, the stiffness of connection spring of four kinds of structural analysis models with joints is also changed to investigate the effect of different spacing of tension and reinforcement on seismic performance of jointed model in practical engineering. It is concluded that the increase of spring stiffness has an obvious effect on the slit model whose aspect ratio is less than 1.2, and the greater the spring stiffness, the more obvious the bearing capacity is.
【學(xué)位授予單位】：沈陽建筑大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU391;TU352.11

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本文編號：1790001