【摘要】：帶填充墻鋼筋混凝土框架結(jié)構(gòu)能夠提供較大的使用空間,一直是我國多層房屋廣泛采用的結(jié)構(gòu)形式。傳統(tǒng)設(shè)計中填充墻作為框架結(jié)構(gòu)非受力構(gòu)件,不承擔水平荷載的作用,但歷次震害研究表明,填充墻與框架是協(xié)同工作的。因此,我們不能簡單的將填充墻看作非結(jié)構(gòu)構(gòu)件,應(yīng)當考慮其與框架整體的協(xié)同作用。結(jié)合前人所做研究,本文主要完成的工作如下:(1)以某6層帶填充墻框架結(jié)構(gòu)為背景,根據(jù)剛度等效原則,采用等效斜撐模型來模擬填充墻,建立不同填充墻布置下的計算模型,通過模態(tài)分析將純框架模型與填充墻框架模型進行對比,探討現(xiàn)行規(guī)范對于框架結(jié)構(gòu)周期折減系數(shù)的合理性。(2)采用振型分解反應(yīng)譜法和時程分析法對填充墻框架結(jié)構(gòu)進行了彈性和彈塑性分析。在多遇地震作用下,填充墻為結(jié)構(gòu)提供了較大的側(cè)向剛度,有效地減小了結(jié)構(gòu)的側(cè)向位移,承擔了較大的水平剪力,起到了較好的耗能效果;在罕遇地震作用下,填充墻的剛度效應(yīng)有所降低,但仍然能承擔一部分水平剪力,對結(jié)構(gòu)的位移起到一定的影響;填充墻的豎向不規(guī)則布置導(dǎo)致框架結(jié)構(gòu)薄弱層的凸顯,對抗震不利。(3)對純框架模型和填充墻框架模型分別進行Pushover分析。通過梁、柱塑性鉸的分布及發(fā)展程度可知,填充墻的加入有效的抑制了塑性鉸的發(fā)展,但在未布置填充墻的樓層塑性鉸發(fā)展迅速,加劇了薄弱層的破壞。通過對三種填充墻豎向不規(guī)則布置模型的性能點進行分析,得出了最不利的一種方案。(4)針對分析得出的填充墻最不利布置提出改進方案,建立相應(yīng)的計算模型,通過非線性時程分析以及pushover分析等手段,圍繞層間位移角、性能點和塑性鉸等進行全面的有效性驗證。(5)探究了不同填充墻材料對于框架結(jié)構(gòu)抗震性能的影響。結(jié)果表明,在彈性分析下,輕質(zhì)填充墻材料對結(jié)構(gòu)位移的控制占有明顯優(yōu)勢,對于填充墻豎向不規(guī)則布置的情況,輕質(zhì)填充墻表現(xiàn)出較好的抗震性能;在罕遇地震作用下,由于傳統(tǒng)磚墻的容重較大,使得結(jié)構(gòu)吸收的地震作用較大,當填充墻發(fā)生破壞失效時,吸收的能量完全由原框架結(jié)構(gòu)通過變形耗散,故傳統(tǒng)磚墻對于框架結(jié)構(gòu)的抗震更加不利,因此,選用輕質(zhì)填充墻材料更加符合抗震設(shè)防的理念。
[Abstract]:Reinforced concrete frame structure with infilled walls can provide a large space for use and has been widely used in multi-story buildings in China. In the traditional design, the infilled wall, as a non-stress member of frame structure, does not bear the function of horizontal load, but previous earthquake damage studies show that the infilled wall and frame work together. Therefore, we can not simply regard the infilled wall as a non-structural component, we should consider its synergy with the whole frame. The main work of this paper is as follows: (1) based on the principle of stiffness equivalence, the infill wall is simulated by equivalent inclined brace model. The calculation model of different infill wall arrangement is established, and the pure frame model and the infilled wall frame model are compared by modal analysis. This paper discusses the rationality of the current codes for the periodic reduction coefficients of frame structures. (2) the elastic and elastoplastic analysis of infilled wall frame structures is carried out by using the mode decomposition response spectrum method and time-history analysis method. Under the action of frequent earthquakes, the infilled wall provides a large lateral stiffness for the structure, effectively reduces the lateral displacement of the structure, undertakes a large horizontal shear force, and plays a better energy dissipation effect. Under the rare earthquake, the stiffness effect of the infilled wall is reduced, but it can still bear some horizontal shear force, which has a certain effect on the displacement of the structure. The vertical irregular arrangement of infilled walls makes the weak story of frame structure prominent, which is unfavorable to earthquake resistance. (3) Pushover analysis of pure frame model and infilled wall frame model is carried out respectively. Through the distribution and development of plastic hinge in beam and column, it can be seen that the addition of infilled wall effectively inhibits the development of plastic hinge, but the plastic hinge of floor without infilled wall develops rapidly, which intensifies the failure of weak layer. By analyzing the performance points of three kinds of vertical irregular layout models of infilled walls, a most unfavorable scheme is obtained. (4) an improved scheme is put forward for the most unfavorable arrangement of infilled walls, and the corresponding calculation model is established. By means of nonlinear time-history analysis and pushover analysis, the effectiveness of different infilled wall materials on seismic behavior of frame structures is investigated by means of comprehensive validation of displacement angle, performance points and plastic hinges. The results show that, under the elastic analysis, the control of the structural displacement of the lightweight infilled wall has obvious advantages, and for the case of the vertical irregular arrangement of the filled wall, the lightweight infilled wall shows good seismic performance. Under rare earthquake, because of the large bulk density of traditional brick wall, the seismic action absorbed by the structure is greater. When the infilled wall fails, the absorbed energy is completely dissipated by the deformation of the original frame structure. Therefore, the traditional brick wall is more unfavorable to the earthquake resistance of the frame structure, so the choice of lightweight infilled wall materials is more in line with the idea of seismic fortification.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU352.11;TU375.4

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