本文選題：偏心支撐　切入點(diǎn)：窯尾塔架　出處：《武漢理工大學(xué)》2013年碩士論文

【摘要】：近年來,隨著鋼結(jié)構(gòu)的飛速發(fā)展,鋼結(jié)構(gòu)建筑抗震設(shè)計(jì)成為設(shè)計(jì)人員面臨的一個(gè)重要問題。偏心支撐框架既具有傳統(tǒng)中心支撐框架的剛度,又有傳統(tǒng)抗彎框架的延性和能量耗散能力,耗能梁段屈服能吸收和耗散強(qiáng)烈地震作用時(shí)過多的能量,從而減小地震對結(jié)構(gòu)造成的危害,同時(shí)還能有效節(jié)約15%～30%的鋼材。偏心支撐結(jié)構(gòu)在美國和日本的高地震烈度區(qū)使用較多。 K型偏心支撐作為混凝土-鋼框架窯尾塔架的抗側(cè)力體系,是一種新型的理想框架支撐體系。本文在前人研究的理論基礎(chǔ)上,以實(shí)際窯尾工程項(xiàng)目為背景,利用大型通用有限元分析軟件ANSYS,研究K型偏心支撐混凝土-鋼框架窯尾塔架的抗震性能。本文的主要研究內(nèi)容如下： 1、建立窯尾塔架有限元模型。窯尾是一個(gè)平面尺寸小、總高及層高大、荷載大且空間結(jié)構(gòu)比較復(fù)雜的結(jié)構(gòu),在建模階段做了簡化工作,分別建立了中心支撐與不同梁段長度的偏心支撐的窯尾塔架模型。 2、采用靜力分析、模態(tài)分析、反應(yīng)譜分析和時(shí)程分析等方法對中心支撐窯尾塔架與偏心支撐窯尾塔架進(jìn)行有限元分析,研究水平地震作用下的動力反應(yīng)及抗震性能分析。反應(yīng)譜分析比較了中心支撐模型和不同耗能梁段長度的偏心支撐模型在設(shè)防烈度為8度的多遇地震作用下地震響應(yīng),包括水平位移、柱底軸力、支撐軸力和等效應(yīng)力。時(shí)程分析比較了中心支撐模型和不同耗能梁段長度的偏心支撐模型在設(shè)防烈度為8度的多遇地震和罕遇地震下的地震響應(yīng),包括水平位移、柱底軸力、支撐軸力和等效應(yīng)力。 3、對支撐與梁之間的不同連接構(gòu)造、不同支撐截面形式進(jìn)行了模態(tài)分析和時(shí)程分析的對比。梁柱連接節(jié)點(diǎn)對結(jié)構(gòu)有著相當(dāng)重要的作用,連接節(jié)點(diǎn)的形式與性質(zhì)對框架整體受力性能有著直接的影響作用�？蚣芙Y(jié)構(gòu)的內(nèi)力和位移不僅受梁柱連接剛度的大小的影響,而且結(jié)構(gòu)構(gòu)件的穩(wěn)定與其有著密切聯(lián)系。故本文分別用梁單元和桿單元來模擬支撐,采用時(shí)程分析比較了中心支撐模型和偏心支撐模型在設(shè)防烈度為8度的罕遇地震下的地震響應(yīng),包括水平位移、柱底軸力、支撐軸力和等效應(yīng)力,分析兩種單元情況下支撐的減震效果有無差異。
[Abstract]:In recent years, with the rapid development of steel structures, seismic design of steel structures has become an important problem faced by designers.Eccentrically braced frame not only has the stiffness of traditional center-braced frame, but also has the ductility and energy dissipation ability of traditional flexural frame.Thus, the damage caused by earthquake to the structure is reduced, and the steel is saved by 15% and 30%.Eccentrically braced structures are widely used in high seismic intensity areas of the United States and Japan.K eccentricity bracing is a new type of ideal frame bracing system, which is used as the lateral force resisting system of concrete-steel frame kiln tower.In this paper, based on the theory of previous studies, the seismic behavior of K-type eccentrically braced concrete-steel frame kiln tail tower is studied by using the large-scale general finite element analysis software ANSYS. based on the actual kiln tail engineering project.The main contents of this paper are as follows:1. The finite element model of kiln tail tower is established.The kiln tail is a structure with small plane size, total height and tall story, large load and complicated spatial structure. In the modeling stage, simplified work has been done, and the tower model of center support and eccentric support with different beam length has been established respectively.2. The static analysis, modal analysis, response spectrum analysis and time-history analysis are used to analyze the dynamic response and seismic behavior of the central supported kiln tail tower and the eccentric supporting kiln tail tower.Response spectrum analysis is used to compare the seismic responses of the central bracing model and the eccentric bracing model with different energy dissipation beam lengths under the action of frequent earthquakes with a fortification intensity of 8 degrees, including horizontal displacement, column bottom axial force, bracing axial force and equivalent stress.The seismic responses of central bracing model and eccentrically braced model with different energy dissipation beam lengths are analyzed and compared, including horizontal displacement, column bottom axial force, bracing axial force and equivalent stress.3. The modal analysis and time history analysis are carried out to compare the different connections between the bracing and the beam, as well as the different cross-section forms of the braces.Liang Zhu connection joint plays a very important role in the structure, and the form and nature of the connection joint have a direct impact on the overall mechanical behavior of the frame.The internal force and displacement of frame structure are affected not only by the stiffness of Liang Zhu connection, but also by the stability of structural members.In this paper, the beam element and the bar element are used to simulate the support, and the seismic response of the center support model and the eccentric bracing model under the rare earthquake with fortification intensity of 8 degrees are compared by time history analysis, including horizontal displacement, axial force at the bottom of the column.The axial force and the equivalent stress of the support are analyzed, and the difference of the shock absorption effect between the two kinds of elements is analyzed.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU398.9

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