本文選題：冷彎薄壁型鋼-覆面板材自攻螺釘連接件　切入點(diǎn)：抗剪承載力　出處：《東南大學(xué)》2015年碩士論文

【摘要】：冷彎薄壁型鋼結(jié)構(gòu)體系源于傳統(tǒng)的木結(jié)構(gòu),是一種富有特色的新型結(jié)構(gòu)體系,具有高性能、輕質(zhì)、產(chǎn)業(yè)化、環(huán)保等顯著特點(diǎn)。此類結(jié)構(gòu)體系在國外低層住宅中已得到廣泛應(yīng)用,在我國應(yīng)用起步較晚。自攻螺釘連接是該結(jié)構(gòu)體系中一種主要的連接形式。本文通過兩種不同試驗(yàn)裝置對(duì)冷彎薄壁型鋼·覆面板材白攻螺釘連接的力學(xué)性能進(jìn)行試驗(yàn)研究,擬合出其骨架曲線模型和滯回模型,并運(yùn)用有限元軟件對(duì)連接件單調(diào)加載工況進(jìn)行了數(shù)值模擬。主要內(nèi)容及結(jié)論如下：首先,通過材性試驗(yàn)得到了四種覆面板材的彈性模量、靜曲強(qiáng)度和泊松比：通過238組連接件的抗剪試驗(yàn)研究,探討了試驗(yàn)裝置、覆面板材類型(石膏板、玻鎂板、OSB板和硅酸鈣板)、螺釘端距、鋼龍骨厚度、螺釘直徑、加載方式(單調(diào)拉／壓和低周往復(fù)加載)以及板材布置方向?qū)鋸澅”谛弯撟怨ヂ葆斶B接件力學(xué)性能及破壞模式的影響。試驗(yàn)結(jié)果表明：對(duì)于單調(diào)加載工況,兩種試驗(yàn)裝置下連接件的破壞模式相同,且除鋼龍骨-OSB板連接件外其余三種連接件的峰值荷載誤差均在±15%范圍內(nèi),各參數(shù)呈現(xiàn)相同的規(guī)律；但采用多根螺釘連接件加載裝置時(shí),得到的連接件峰值變形普遍較大,可通過減小墊板與U型龍骨腹板的寬度差值盡量減小此誤差；四種連接件在單調(diào)拉伸時(shí)均為板材承壓破壞,均未出現(xiàn)螺釘剪斷,低周往復(fù)加載時(shí),鋼龍骨-OSB板和鋼龍骨-硅酸鈣板連接件會(huì)出現(xiàn)螺釘彎曲甚至螺釘被剪斷的現(xiàn)象；板材類型、螺釘端距對(duì)連接件力學(xué)性能影響明顯,隨螺釘端距增大,連接件承載力相應(yīng)增大；龍骨厚度和螺釘直徑對(duì)連接件力學(xué)性能的影響較小,且與覆面板材種類相關(guān)；鋼龍骨-OSB板與鋼龍骨-MgO板連接件受板材方向(指平行板材長邊或短邊方向截取板材)影響不大：鋼龍骨-GWB板和鋼龍骨-CSB板連接件沿長邊方向截取板材,其連接件承載力較短邊分別提高了10%和20%-50%；低周往復(fù)加載時(shí),連接件荷載-變形曲線存在明顯“捏攏效應(yīng)”,較之單調(diào)拉神連接件抗剪承載力下降4%～18%,且邊距越大,降幅越突出,故而需對(duì)單調(diào)加載所得承載力折減后再用于工程設(shè)計(jì)。然后,通過對(duì)試驗(yàn)數(shù)據(jù)的處理和分析,并借鑒木結(jié)構(gòu)釘子連接的幾種常見恢復(fù)力模型,得到了冷彎薄壁型鋼-覆面板材自攻螺釘連接件的恢復(fù)力模型,包括單調(diào)加載時(shí)連接件的"Foschi"指數(shù)型骨架曲線模型和低周往復(fù)加載時(shí)連接件的Pivot定點(diǎn)指向型滯回模型。最后,采用ANSYS有限元程序?qū)鋸澅”谛弯?覆面板材自攻螺釘連接件單調(diào)加載工況的力學(xué)性能進(jìn)行了數(shù)值模擬分析。模型的建立考慮了材料非線性及接觸非線性。采用Solid45單元模擬連接件及自攻螺釘,在連接件螺釘孔部位設(shè)置接觸單元,并對(duì)自攻螺釘進(jìn)行了合理簡化,同時(shí)忽略自攻螺釘旋入時(shí)產(chǎn)生的預(yù)緊力。對(duì)于硅酸鈣板(CSB板)這樣的脆性覆面板材本文采用Solid45單元和Solid65單元分別進(jìn)行實(shí)體建模,前者模擬此類連接件的荷載-變形曲線,后者模擬其裂縫開展,二者互為補(bǔ)充。將有限元模擬所得破壞模式、荷載-變形曲線走勢(shì)、連接件的承載力及各因素(包括板材布設(shè)方向、螺釘直徑、龍骨厚度和螺釘端距等)對(duì)連接件性能的影響與試驗(yàn)結(jié)果對(duì)比分析,證實(shí)有限元模型準(zhǔn)確有效。
[Abstract]:The source of cold-formed steel structure to the traditional wooden structure, is a kind of new structure characteristic, has the advantages of high performance, lightweight, industrialization, environmental protection and other notable features. This kind of structure system has been widely used in low rise residential, relatively late in our application of self tapping screw connection is a start. The main connection form of the structural system. In this paper, through two different test device of cold-formed steel cladding plate, connecting white tapping screws mechanical properties of experimental research, the fitting model of skeleton curve and hysteretic model, and use the finite element software to simulate the monotonic loading conditions. The main connection the contents and conclusions are as follows: firstly, through the material test results of the elastic modulus of the four cladding plate, static bending strength and Poisson's ratio by shearing test on 238 groups of joints, discusses the test device, Cover plate type (gypsum board, glass magnesium board, OSB board and calcium silicate board), screw end distance, thickness, diameter of the screw steel keel, loading mode (monotonic tension / pressure and low cyclic loading effects) and sheet arrangement direction of connector mechanical performance and failure mode of cold-formed steel tapping screws. The test results show that the monotonic loading conditions, the same failure mode of connection of two kinds of test device, and in addition to the peak load error of the other three types of connectors of steel keel plate were -OSB + 15% in the range of each parameter has the same rule; but adopts a plurality of screw loading device, get the connector peak deformation is generally larger, can reduce the error by reducing the width difference plate and U type keel plate; four kinds of joints under monotonic tensile were plate bearing damage without screw cut, low Zhou Wangfu When loading, -OSB steel keel plate and steel keel - calcium silicate plate will appear even cut screw screw bending phenomenon; plate type, screw end distance obviously on the mechanical properties of joints, with the screw end distance increases, a corresponding increase in the bearing capacity of joints; keel thickness and diameter of the screw has little effect on the connecting piece the mechanical properties, and cladding plate types; steel plate and steel keel keel -OSB -MgO plate by plate direction (parallel plate refers to the long side or short side direction interception plate): -GWB has little effect on steel keel plate and steel keel -CSB board connector interception along the long side direction of the plate, the connecting piece is the short side was increased by 10% and 20%-50% capacity; low cyclic loading, the load deformation curve of joints and obvious "pinching effect", a monotonic shear capacity of connections would fall from 4% to 18%, and the margin of the greater decline More prominent, therefore need reduction after used for engineering design on the bearing capacity of the monotonic loading. Then, through the test data processing and analysis, and draw some wooden nail connection common restoring force model, the cold-formed steel cladding plate self tapping screw of the restoring force model, including monotonic loading when the connecting piece of the "Foschi" type index skeleton curve model and low cyclic loading when the connection point Pivot oriented hysteretic model. Finally, the mechanical properties of cold-formed steel cladding plate - monotonic loading condition of self tapping screw is simulated and analyzed by using the finite element program ANSYS model considering. The material nonlinearity and contact nonlinearity. Using Solid45 element and self tapping screws, contact element is set on the connecting piece and the screw hole, tapping screws are reasonably simplified, At the same time, ignoring the pretightening force self tapping screws screwed in. The calcium silicate board (CSB board) that the Solid45 cladding plate brittle unit and Solid65 unit for solid modeling, the simulation of deformation curve of load - such connections, which simulate the crack development, the two complement each other. The Co. the element failure mode, load deformation curve, bearing capacity of joints and the various factors (including the sheet layout direction, screw diameter, keel thickness and screw end distance) influence on the connection performance and test result analysis, confirmed that the finite element model is accurate and effective.

【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU392.1

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