發(fā)布時間：2018-06-14 12:05

  本文選題：空心樓蓋 + 方箱內(nèi)模��； 參考：《湖南大學(xué)》2015年碩士論文

【摘要】：現(xiàn)澆鋼筋混凝土空心樓蓋體系就是近年來應(yīng)用最廣泛的一種新型樓蓋技術(shù)之一。它自重輕、材料省、剛度大、施工快、綜合經(jīng)濟性好,特別適用于大跨度、大荷載建筑的樓蓋體系,而且密閉空腔具有隔熱降噪的效果,是一種良好的節(jié)能結(jié)構(gòu)。在現(xiàn)澆空心樓蓋的多種芯模形式中,薄壁方箱內(nèi)模又以剛度大、空心率高等優(yōu)點在近些年來被廣泛應(yīng)用。這種樓蓋體系的工程設(shè)計計算方法多采用彈性簡化計算方法,然而它們各自都有相應(yīng)的優(yōu)點和不足。本文分析《規(guī)程》中介紹的擬梁法并稍作改進,在適用性廣的基礎(chǔ)上提高了它的精確性,為實際工程的設(shè)計提供一定的理論依據(jù)和建議,本文主要分以下三個方面:1)綜合分析比較各種簡化計算方法,評價它們各自的優(yōu)缺點,針對《規(guī)程》中介紹的適用性較好,應(yīng)用較廣泛的擬梁法稍作改進。在柱上板帶中應(yīng)力變化梯度較陡的部位,第一根肋梁單獨歸并,第二根到靠近邊梁1/4處的肋梁歸并,中間全部肋梁歸并為中間擬梁,并針對其歸并后扭轉(zhuǎn)剛度的影響提出相應(yīng)的方法。然后利用sap2000建立實體單元有限元模型,與同樣情況下的PKPM改進擬梁法模型對比,通過內(nèi)力、位移、撓度、周期的比較來驗證該改進方法的準確性。2)受理論水平和研究條件的限制,針對空心樓蓋的研究大多處于彈性階段,對它的破壞機理、破壞形態(tài)及破壞特征的認識還存在不足,因此對其彈塑性階段的受力分析具有很大的意義。本文分別計算出在四邊簡支情況下空心樓蓋的極限承載力和利用改進擬梁法得到的塑性承載力進行對比,其結(jié)果也較為接近。因此,使用該改進方法模擬現(xiàn)澆空心樓蓋非彈性階段的受力也具有一定的準確性。柔性支撐空心樓蓋不設(shè)主次梁,彈塑性階段形成塑性絞線,現(xiàn)在的大部分結(jié)構(gòu)分析軟件大多能很好的模擬框架結(jié)構(gòu)中的塑性鉸,對于無梁體系的塑性絞線卻無能為力,因此本文采用靜力彈塑性分析方法通過對改進擬梁法簡化后的計算模型進行彈塑性分析來探索無梁空心樓蓋體系的彈塑性分析方法,結(jié)果也顯示層間位移角都符合規(guī)范規(guī)定的彈塑性層間位移角要求,整體結(jié)構(gòu)具有很好的耗能抗震能力。3)最后,結(jié)合已設(shè)計完成的昆山某集團公司研發(fā)與會展中心,該項目辦公樓區(qū)域采用GBF蜂巢芯現(xiàn)澆混凝土空心樓蓋體系,板厚400mm,本文采用剛度更大的方箱內(nèi)�？招臉巧w體系,板厚減少為350mm,用改進擬梁法模型重新設(shè)計該樓蓋,計算內(nèi)力并配筋。
[Abstract]:Cast-in-place reinforced concrete hollow floor system is one of the most widely used new floor technology in recent years. It is light in weight, low in material, large in rigidity, fast in construction and good in comprehensive economy. It is especially suitable for the floor system of long span and large load buildings, and the airtight cavity has the effect of heat insulation and noise reduction, so it is a good energy-saving structure. In the various core forms of cast-in-place hollow floor, the inner die of thin-walled square box is widely used in recent years with the advantages of high stiffness and high hollow rate. The elastic simplified calculation method is often used in the engineering design of this floor system. However, each of them has its own advantages and disadvantages. In this paper, the quasi-beam method introduced in Code is analyzed and improved, which improves its accuracy on the basis of its wide applicability, and provides some theoretical basis and suggestions for the design of practical engineering. This paper is mainly divided into the following three aspects: (1) Comprehensive analysis and comparison of various simplified calculation methods, evaluation of their respective advantages and disadvantages, in view of the "rules" introduced in the applicability of the better, the more widely used quasi-beam method is slightly improved. Where the stress gradient is steeper in the upper plate zone, the first rib beam is merged alone, the second rib beam is merged to the rib beam near the side beam 1 / 4, and all the middle rib beams merge into the middle pseudo beam. The corresponding method is put forward for the influence of torsional stiffness after merging. Then the finite element model of solid element is established by using sap2000, and compared with the improved quasi-beam model under the same condition, through internal force, displacement, deflection, The accuracy of the improved method is limited by the theoretical level and the research conditions. Most of the research on hollow floor is in the elastic stage, and the understanding of its failure mechanism, failure form and failure characteristics is still insufficient. Therefore, it is of great significance to analyze the stress in the elastic-plastic stage. In this paper, the ultimate bearing capacity of hollow floor under the condition of simply supported on four sides is calculated and compared with the plastic bearing capacity obtained by using the improved pseudo beam method. The results are also close to each other. Therefore, using the improved method to simulate the inelastic stage of cast-in-place hollow floor is also accurate. There are no primary and secondary beams in flexible braced hollow floor, and plastic strands are formed in elastic-plastic stage. Most of the present structural analysis software can simulate plastic hinge in frame structure well, but there is nothing that can be done for plastic strands in beamless systems. Therefore, the static elastoplastic analysis method is used to explore the elastoplastic analysis method of the beamless hollow floor system through the elastic-plastic analysis of the simplified computational model of the improved quasi-beam method. The results also show that the interstory displacement angles are all in line with the elastic-plastic interstory displacement angle requirements stipulated in the code, and the overall structure has a good seismic energy dissipation capacity. Finally, combined with the research and development and exhibition center of a group company in Kunshan, which has been designed and completed, The GBF honeycomb core cast-in-place concrete hollow floor system is used in the office building area of the project, and the slab thickness is 400mm. In this paper, the square box inner mold hollow floor system with greater stiffness is adopted, the slab thickness is reduced to 350 mm, and the floor is redesigned with the improved quasi-beam model. Calculate internal force and reinforcement.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU755

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本文編號：2017312