【摘要】：近年來,輕鋼結(jié)構(gòu)因其巨大的經(jīng)濟優(yōu)勢、良好的抗震及節(jié)能環(huán)保性能,已被廣泛應(yīng)用于低層和多層房屋中。由于雙向梁難于制造,節(jié)點構(gòu)造復(fù)雜,傳統(tǒng)輕鋼龍骨結(jié)構(gòu)的樓面梁均為單向密布的實腹梁或桁(剛)架構(gòu)成。這種單向梁體系構(gòu)造簡單,但僅沿墻的一個方向設(shè)置,墻體單方向受力,不能充分發(fā)揮墻體的承載力,且梁截面較高,剛度相對較小。 本文提出了一種新型的輕鋼結(jié)構(gòu)樓面梁體系—由單向桁架梁相互交叉連接而成的雙向桁架體系。其中桁架梁的上下弦桿為口40×20×1.2Imn的冷彎薄壁矩形鋼管,腹桿是標(biāo)準(zhǔn)的Z字型連接件,由φ25的圓管在端部沖壓再折彎制作而成。腹桿與上下弦桿和梁與梁之間通過自攻螺絲或者螺栓連接。 論文詳細(xì)介紹了格構(gòu)輕鋼雙向梁的材料、構(gòu)成、制作和安裝方法并總結(jié)了其特點；對相同規(guī)格尺寸的3m×3m跨的雙向梁和單向梁分別進(jìn)行了豎向均布荷載下的承載力試驗,敘述了試驗的裝置,過程和荷載加載方法,測得了其在各級荷載下典型位置的應(yīng)變和撓度,得到它們的極限承載力和破壞模態(tài),作出了荷載—位移曲線和荷載—應(yīng)變曲線圖,并進(jìn)行了對比；利用有限元軟件非線性分析得到了雙向、單向梁的力學(xué)性能、撓度、破壞模態(tài)和承載力等。試驗與有限元分析結(jié)果有一定的差異,文中分析了其原因。通過本文分析結(jié)果表明此種格構(gòu)輕鋼雙向梁體系的撓度較大,但可以用在一些承擔(dān)荷載小的輕鋼房屋樓面或者屋面中。 最后,本文給出了一些格構(gòu)輕鋼雙向梁體系試驗和理論研究的改進(jìn)建議,為今后此類結(jié)構(gòu)體系的實際工程設(shè)計提供一些依據(jù)和未來的研究方向提供了參考。
[Abstract]:In recent years, light steel structure has been widely used in low-rise and multi-storey buildings because of its great economic advantages, good seismic and energy-saving and environmental protection performance. Because the two-way beam is difficult to manufacture and the joint structure is complex, the floor beam of the traditional light steel keel structure is composed of one-way dense solid web beam or truss (rigid) frame. The structure of the one-way beam system is simple, but only along one direction of the wall, the unidirectional force of the wall can not give full play to the bearing capacity of the wall, and the beam section is higher and the stiffness is relatively small. In this paper, a new type of light steel structure building surface beam system, which is composed of unidirectional truss beams intersecting with each other, is proposed. The upper and lower chord of the truss beam is a cold-formed thin-wall rectangular steel pipe with a mouth of 40 脳 20 脳 1.2Imn, and the web is a standard Z-shaped connector, which is made of 蠁 25 circular pipe stamping and bending at the end. The web is connected to the upper and lower chord and the beam to the beam by tapping screws or bolts. In this paper, the material, composition, manufacture and installation method of lattice light steel bidirectional beam are introduced in detail, and its characteristics are summarized. The bearing capacity tests of bidirectional beams and unidirectional beams with the same specification size of 3m 脳 3m span under vertical uniform load are carried out respectively. the test device, process and load loading method are described. the strain and deflection of typical positions under various loads are measured, their ultimate bearing capacity and failure mode are obtained, and the load-displacement curve and load-strain curve are made and compared. The mechanical properties, deflection, failure mode and bearing capacity of bidirectional and unidirectional beams are obtained by nonlinear analysis of finite element software. There is a certain difference between the experimental results and the finite element analysis results, and the reasons are analyzed in this paper. The results of this paper show that the deflection of the lattice light steel two-way beam system is large, but it can be used in the floor or roof of some light steel houses with small load. Finally, some suggestions for improving the test and theoretical research of lattice light steel two-way beam system are given, which provides some references for the practical engineering design of this kind of structure system in the future and the future research direction.
【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】：TU392.5

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