本文選題：地震作用 + 框架結(jié)構(gòu)��； 參考：《南昌航空大學(xué)》2017年碩士論文

【摘要】：框架結(jié)構(gòu)是多層鋼筋混凝土建筑中應(yīng)用非常廣泛的一種結(jié)構(gòu)形式,在這種結(jié)構(gòu)中,樓梯和主體結(jié)構(gòu)往往是通過整澆方式連接在一起的,兩者之間形成了較強(qiáng)的約束作用。在地震作用下,具有可觀剛度的梯板會(huì)隨框架一起發(fā)生較大變形,導(dǎo)致樓梯和框架的相互作用很大,不僅使得樓梯容易發(fā)生破壞,而且對(duì)框架結(jié)構(gòu)本身的抗震能力也產(chǎn)生了一定程度的削弱作用。通過對(duì)汶川地震災(zāi)后現(xiàn)場(chǎng)的調(diào)查和分析發(fā)現(xiàn),框架結(jié)構(gòu)中的樓梯破壞最為嚴(yán)重,并且樓梯也往往先于框架發(fā)生破壞。減弱樓梯和框架的約束效果可以減小地震中樓梯和框架的相互作用,基于這種想法,我們可以對(duì)樓梯進(jìn)行降撐設(shè)計(jì)來降低這種相互作用對(duì)樓梯以及框架抗震能力的不利影響。本文用SAP2000建立10個(gè)6層的鋼筋混凝土框架結(jié)構(gòu)模型,它們分別是:1個(gè)純框架結(jié)構(gòu)(不含樓梯)的CKJ模型,1個(gè)含有板式樓梯的框架結(jié)構(gòu)模型(即未進(jìn)行降撐設(shè)計(jì)的模型B),8個(gè)含有降撐樓梯的框架結(jié)構(gòu)模型。主要研究?jī)?nèi)容如下:(1)用SAP2000建立各模型,然后進(jìn)行模態(tài)分析計(jì)算各模型的自振振型和周期,通過分析各模型的自振周期了解不同類型樓梯對(duì)框架結(jié)構(gòu)的剛度貢獻(xiàn)。(2)分別對(duì)各模型進(jìn)行多遇地震下的反應(yīng)譜分析和線性時(shí)程分析,驗(yàn)算了結(jié)構(gòu)彈性層間位移角,并且對(duì)層間剪力、樓梯間處框架柱內(nèi)力和框架梁內(nèi)力、梯板的內(nèi)力和消能減震支座的附加阻尼比進(jìn)行了計(jì)算分析。(3)分別對(duì)各模型進(jìn)行罕遇地震下的非線性時(shí)程分析,計(jì)算各模型層間位移角、層間位移、頂點(diǎn)位移、滑動(dòng)支座的水平彈塑性變形以及消能減震支座的耗能,并且繪制出消能減震支座的滯回曲線。(4)對(duì)各模型分別進(jìn)行Pushover分析,從而計(jì)算各模型的能力曲線和性能點(diǎn),通過觀察各模型構(gòu)件的塑性鉸發(fā)展情況分析各模型構(gòu)件的屈服順序,從而對(duì)各模型在小震、中震、大震性能點(diǎn)處結(jié)構(gòu)和構(gòu)件的狀態(tài)進(jìn)行評(píng)估。通過將9個(gè)含樓梯的框架結(jié)構(gòu)模型與模型CKJ進(jìn)行對(duì)比分析,可以了解這9種樓梯對(duì)框架結(jié)構(gòu)的抗震性能影響程度;根據(jù)8個(gè)含有降撐樓梯的模型與模型B對(duì)比分析結(jié)果,可以評(píng)估出這8種降撐樓梯的降撐效果。因此,本文的研究能夠?yàn)樵O(shè)計(jì)者對(duì)樓梯進(jìn)行降撐設(shè)計(jì)提供參考,從而實(shí)現(xiàn)改善框架結(jié)構(gòu)抗震性能的目的,具有良好的工程實(shí)際意義。
[Abstract]:The frame structure is a kind of structure form which is widely used in multi-story reinforced concrete building. In this kind of structure, the staircase and the main structure are often connected together by the way of integral pouring. Under the earthquake, the ladder plate with considerable stiffness will deform with the frame, which leads to the great interaction between the staircase and the frame, which not only makes the staircase vulnerable to destruction. Moreover, the aseismic capacity of the frame structure is weakened to a certain extent. Through the investigation and analysis on the scene after Wenchuan earthquake, it is found that the staircase damage is the most serious in the frame structure, and the staircase is often destroyed before the frame. Reducing the constraint effect of staircase and frame can reduce the interaction between staircase and frame in earthquake. Based on this idea, we can design stair to reduce the adverse effect of this interaction on the seismic capacity of staircase and frame. In this paper, 10 six story reinforced concrete frame structure models are established with SAP2000. They are: 1 CKJ model of pure frame structure (without stairs), 1 frame structure model with plate staircase (that is, model B), 8 frame structure models with falling stair. The main research contents are as follows: (1) each model is established with SAP2000, and then modal analysis is carried out to calculate the natural vibration mode and period of each model. By analyzing the natural vibration period of each model, the stiffness contribution of different staircases to the frame structure is understood. (2) the response spectrum analysis and linear time history analysis of each model are carried out respectively, and the displacement angle between the elastic layers of the structure is checked and calculated. The interstory shear force, the internal force of the frame column and the internal force of the frame beam at the staircase, the internal force of the ladder plate and the additional damping ratio of the energy dissipation support are calculated and analyzed. (3) the nonlinear time history analysis of each model under rare earthquake is carried out. The interstory displacement angle, interstory displacement, vertex displacement, horizontal elastic-plastic deformation of sliding support and energy dissipation of energy dissipation support are calculated, and the hysteretic curve of energy dissipation support is drawn. (4) pushover analysis is carried out for each model. The capacity curves and performance points of each model are calculated, and the yield order of each model member is analyzed by observing the development of plastic hinge of each model member. The state of structures and members at seismic performance points is evaluated. Through comparative analysis of 9 frame structure models with staircase and CKJ model, we can understand the influence of these 9 kinds of staircases on the seismic performance of frame structures, and according to the comparative analysis results of 8 models and model B with down-braced staircases, We can evaluate the effect of these eight kinds of stair. Therefore, the research in this paper can provide a reference for designers to design stair strut, and achieve the purpose of improving the seismic performance of frame structure, which has good engineering practical significance.
【學(xué)位授予單位】：南昌航空大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU352.11

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