發(fā)布時(shí)間：2018-05-14 03:09

  本文選題：空心樓蓋 + 寬扁梁��； 參考：《湖南科技大學(xué)》2017年碩士論文

【摘要】：大跨度現(xiàn)澆混凝土空心樓蓋是一種新型的結(jié)構(gòu)體系,它是由雙向密肋發(fā)展而來(lái)的一種無(wú)梁樓蓋結(jié)構(gòu)。由于采用了寬扁梁構(gòu)件,這種結(jié)構(gòu)能有效的降低層高,增加使用面積。同時(shí),空心樓蓋還具有降低自重,減少地震作用等良好的力學(xué)性能,是一種集力學(xué)性能和使用功能相對(duì)全面的結(jié)構(gòu)形式,有著良好的推廣應(yīng)用價(jià)值。當(dāng)前,國(guó)內(nèi)外關(guān)于此結(jié)構(gòu)體系的研究主要集中在單塊空心樓蓋抗彎、抗剪受力性能的試驗(yàn)和理論研究,而對(duì)于考慮寬扁梁約束效應(yīng)的多塊板整體受力性能的研究和大跨度空心樓蓋應(yīng)用于高層建筑中的抗震研究相對(duì)較少。為此,本文通過現(xiàn)場(chǎng)試驗(yàn)和數(shù)值模擬,對(duì)大跨度空心樓蓋豎向受力機(jī)理和大震作用下的抗震性能展開研究,取得以下研究成果:(1)現(xiàn)場(chǎng)豎向加載試驗(yàn)結(jié)果表明,帶寬扁暗梁的大跨度空心樓蓋能滿足現(xiàn)行規(guī)范對(duì)樓板正常使用極限狀態(tài)對(duì)撓度和裂縫寬度的要求。同時(shí),由于寬扁梁高度不夠,未能實(shí)現(xiàn)對(duì)空心板的有效約束,使得2塊板的豎向變形曲線呈現(xiàn)單塊板的特征。(2)基于“空心層”分層殼單元的大跨度空心樓蓋有限元分析表結(jié)果表明,增加梁高度能有效地提高寬扁梁對(duì)周邊空心樓蓋的約束作用,并根據(jù)筒芯空心樓蓋的截面形狀特征及應(yīng)力分布情況,提出了筒芯式空心樓蓋的裂縫計(jì)算方法,其計(jì)算結(jié)果與試驗(yàn)結(jié)果吻合良好。(3)反應(yīng)譜分析結(jié)果表明,寬扁梁空心樓蓋結(jié)構(gòu)由于層高比普通肋梁樓蓋結(jié)構(gòu)低,層剛度大,彈性變形小,更容易滿足變形要求;寬扁梁空心樓蓋結(jié)構(gòu)的扭轉(zhuǎn)周期占比較大,建議增加內(nèi)筒尺寸或加大框架邊梁剛度的方法以提高整體結(jié)構(gòu)的抗扭剛度。125gal彈塑性分析結(jié)果表明,普通肋梁樓蓋結(jié)構(gòu)與寬扁梁空心樓蓋結(jié)構(gòu)的樓面鋼筋應(yīng)力最大值分別為8.4MPa、188.0MPa,寬扁梁空心樓蓋鋼筋應(yīng)力明顯大于普通肋梁樓蓋鋼筋的應(yīng)力,空心板上鋼筋應(yīng)力分布范圍也大于普通肋梁樓蓋,說(shuō)明寬扁梁空心樓蓋結(jié)構(gòu)中樓板鋼筋的參與作用明顯大于普通肋梁樓蓋結(jié)構(gòu)。(4)罕遇地震作用下增量動(dòng)力彈塑性時(shí)程分析(IDA)結(jié)果表明,隨著地震作用的加大,寬扁梁空心樓蓋結(jié)構(gòu)的剛度退化較普通肋梁樓蓋結(jié)構(gòu)明顯,損傷加劇,阻尼增大,周期延長(zhǎng),結(jié)構(gòu)頂點(diǎn)位移反應(yīng)較彈性階段滯后明顯,耗能能力較強(qiáng)。從2種結(jié)構(gòu)在不同地震作用下首層上表面鋼筋應(yīng)力云圖得知,寬扁梁空心樓蓋相對(duì)于普通肋梁樓蓋的損傷程度更深、損傷范圍更廣,耗能能力更加優(yōu)越。但是,由于寬扁梁的剛度不足,無(wú)法對(duì)樓板形成有效的約束,樓板受力性能呈現(xiàn)剪力墻與框架邊梁間對(duì)邊導(dǎo)荷的特點(diǎn)。寬扁梁空心樓蓋結(jié)構(gòu)外剪力墻鋼筋應(yīng)力在各樓層樓面處較普通肋梁樓蓋結(jié)構(gòu)集中嚴(yán)重,表明此類結(jié)構(gòu)對(duì)剪力墻平面外受力性能要求較高,應(yīng)予以高度重視,建議提高寬扁梁空心樓蓋處外剪力墻的縱向配筋率或增設(shè)暗柱和暗梁保證其剪力墻平面外性能。
[Abstract]:Large span cast-in-place concrete hollow floor is a new type of structure system, which is a kind of beamless floor structure developed from two-way multi-ribbed structure. Due to the use of wide flat beam members, this structure can effectively reduce the height of the floor and increase the service area. At the same time, hollow floor has good mechanical properties, such as reducing weight and earthquake action. It is a relatively comprehensive structural form with comprehensive mechanical properties and functions, and has a good value of popularization and application. At present, the research on this structure system at home and abroad mainly focuses on the experimental and theoretical research on the bending and shear behavior of single hollow floor. However, there are few researches on the overall mechanical behavior of multi-slab considering the constraint effect of wide flat beam and the application of long-span hollow floor in high-rise building. In this paper, through field test and numerical simulation, the vertical force mechanism and seismic behavior of large-span hollow floor are studied. The following research results are obtained: 1) the field vertical loading test results show that, The large span hollow floor of flat beam with wide bandwidth can meet the requirement of deflection and crack width for the limit state of normal use of floor slab in current code. At the same time, because the height of the wide flat beam is not enough, the effective constraint on the hollow slab can not be realized. The vertical deformation curve of the two plates presents the characteristics of a single slab. The finite element analysis of the large-span hollow floor is based on the "hollow layer" layered shell element. Increasing the height of the beam can effectively improve the restraint effect of the wide flat beam on the peripheral hollow floor. According to the shape characteristics of the section and the stress distribution of the tubular hollow floor, the crack calculation method of the tubular hollow floor is put forward. The calculated results are in good agreement with the experimental results. The results of response spectrum analysis show that the hollow floor structure with wide flat beam is easier to meet the requirements of deformation because of its lower floor height than that of the common rib beam floor structure, large floor stiffness and small elastic deformation. The torsional period of hollow floor structure with wide flat beam occupies a large proportion. The method of increasing the size of inner cylinder or increasing the stiffness of frame side beam is suggested to improve the torsional stiffness of the whole structure. 125gal elastoplastic analysis results show that, The maximum stress of steel bar on the floor of the common rib beam floor structure and the wide flat beam hollow floor structure is 8.4 MPA and 188.0 MPa, respectively. The stress of the wide flat beam hollow floor steel bar is obviously greater than that of the common rib beam floor steel bar. The stress distribution range of steel bar on hollow slab is larger than that of common rib beam floor. The results show that the participation of floor reinforcement in the hollow floor structure with wide flat beam is obviously greater than that in the common ribbed beam floor structure under rare earthquake. The results show that with the increase of earthquake action, the increment dynamic elastoplastic time history analysis shows that, with the increase of earthquake action, The stiffness degradation of the hollow floor structure with wide flat beam is more obvious than that of the common rib beam floor structure, the damage is aggravated, the damping is increased, the period is prolonged, the displacement response of the structure is obviously delayed than that of the elastic stage, and the energy dissipation ability is stronger. According to the stress cloud diagram of steel bar on the top surface of the first floor of the two structures under different earthquake action, the damage degree of the hollow floor with wide flat beam is deeper than that of the common rib beam floor, the damage range is wider, and the energy dissipation capacity is more superior. However, due to the lack of stiffness of the broad flat beam, it is unable to form an effective constraint on the floor, and the mechanical behavior of the floor presents the characteristics of the shear wall and the side beam of the frame. The outside shear wall stress of hollow floor structure with wide flat beam is more serious than that of common rib beam floor structure on each floor, which indicates that this kind of structure requires high stress performance outside the plane of shear wall and should be attached great importance to. It is suggested to increase the longitudinal reinforcement ratio of the external shear wall at the hollow floor with wide flat beam or to add dark columns and beams to ensure the out-of-plane performance of the shear wall.
【學(xué)位授予單位】：湖南科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU973

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