發(fā)布時(shí)間：2018-05-05 09:17

  本文選題：冷彎薄壁型鋼 + 雙肢拼合箱型截面構(gòu)件��； 參考：《山東建筑大學(xué)》2017年碩士論文

【摘要】：冷彎薄壁型鋼C型截面構(gòu)件彎心與剪心不重合、抗扭能力差,為提高其穩(wěn)定性和承載能力,本文提出了一種雙肢拼合冷彎薄壁型鋼構(gòu)件,通過(guò)在兩個(gè)C型型鋼構(gòu)件中間設(shè)置填板,拼合成一種箱型截面形式。為了探討雙肢拼合冷彎薄壁型鋼截面構(gòu)件的受力性能,采用ANSYS有限元軟件對(duì)拼合構(gòu)件的彎曲和軸壓性能進(jìn)行了數(shù)值模擬分析,探討了填板設(shè)置對(duì)拼合構(gòu)件的破壞模式、極限承載和位移延性等影響,研究表明:1.拼合構(gòu)件在彎曲受力狀態(tài)下:拼合構(gòu)件破壞表現(xiàn)為整體彎曲屈曲和填板之間截面的畸變及局部屈曲的混合模式,未表現(xiàn)出整體的畸變屈曲或彎扭屈曲。(1)填板寬度對(duì)拼合構(gòu)件的受彎性能影響較大,當(dāng)填板寬度在220mm~340mm范圍變化時(shí),隨著填板寬度增加,構(gòu)件的彎曲極限承載力和抗彎剛度呈增大趨勢(shì),位移延性隨填板寬度的增加而減小。(2)填板間距對(duì)拼合構(gòu)件的受彎承載性能影響也較大,當(dāng)填板間距在240mm~400mm范圍變化時(shí),隨著填板間距減小,構(gòu)件的彎曲極限承載力和抗彎剛度呈增大趨勢(shì),位移延性隨著填板間距的減小而增大。(3)翼緣寬厚比對(duì)拼合構(gòu)件的影響明顯,當(dāng)構(gòu)件翼緣寬厚比在35~48范圍變化時(shí),隨著翼緣寬厚比增大,其受彎極限承載力變小,變小趨勢(shì)平緩,翼緣寬厚比越大,翼緣上的破壞程度越大,破壞模式由畸變加局部的混合破壞逐漸變?yōu)榛兤茐?且翼緣板上的破壞逐漸加劇,位移延性隨著翼緣寬厚比的增大而減小。2.拼合構(gòu)件在軸壓受力狀態(tài)下:拼合構(gòu)件破壞表現(xiàn)為整體彎曲屈曲和填板之間截面的畸變及局部屈曲的混合模式;同時(shí),構(gòu)件最先發(fā)生腹板的局部屈曲,未表現(xiàn)出整體的畸變屈曲或彎扭屈曲。(1)填板寬度對(duì)拼合構(gòu)件的受壓性能影響較大,當(dāng)填板寬度在210mm~330mm范圍變化時(shí),隨著填板寬度增加,構(gòu)件軸壓極限承載力和軸壓剛度呈增大趨勢(shì),位移延性隨著填板寬度的增大而增大。(2)填板間距對(duì)拼合構(gòu)件的影響也較大,當(dāng)填板間距在197mm~356mm范圍變化時(shí),隨著填板間距的減小,構(gòu)件軸壓極限承載力和軸壓剛度呈增大趨勢(shì);同時(shí)填板間距的變化,只影響構(gòu)件的破壞程度,不改變構(gòu)件破壞模式,最終都是腹板破壞,帶有一定的翼緣破壞。位移延性隨著填板間距的減小而增大。(3)翼緣寬厚比對(duì)拼合構(gòu)件的影響明顯,當(dāng)翼緣寬厚比在35~48范圍變化時(shí),隨著翼緣寬厚比增大,其軸壓極限承載力呈增大趨勢(shì),翼緣寬厚比越大,構(gòu)件破壞時(shí)翼緣的破壞程度也越大,但不改變構(gòu)件的破壞模式,位移延性隨著翼緣寬厚比的增大而增大。
[Abstract]:In order to improve the stability and bearing capacity of cold-formed thin-walled steel section C section members, the bending center does not coincide with the shear center and the torsion resistance is poor. In order to improve its stability and bearing capacity, a kind of cold-formed thin-walled steel member with two legs is proposed in this paper. A box-shaped section form is formed by setting fill between two C-type steel members. In order to study the mechanical behavior of cold-formed thin-walled steel section members with two legs, the bending and axial compression behaviors of the composite members were simulated by ANSYS finite element software, and the failure mode of the composite members was discussed. The effects of ultimate bearing capacity and displacement ductility are studied. In the state of bending force, the failure of the jointed member is a mixed mode of the section distortion and local buckling between the whole bending buckling and the filling plate. When the width of the fill plate changes in the range of 220mm~340mm, the width of the fill plate increases with the increase of the width of the fill plate, and the bending behavior of the composite member is greatly affected by the width of the fill plate, which does not show the whole distortion buckling or bending buckling. The ultimate flexural capacity and flexural stiffness of the members tend to increase, and the displacement ductility decreases with the increase of the width of the fill plate.) the spacing of the fill plate has a great influence on the flexural bearing capacity of the composite member. When the spacing of the fill plate changes in the range of 240mm~400mm, the displacement ductility decreases with the increase of the width of the fill plate. The ultimate bearing capacity and flexural stiffness of the members increase with the decrease of the spacing between the fill plates, and the displacement ductility increases with the decrease of the spacing between the fillers. When the flange width to thickness ratio changes in the range of 35 ~ 48, with the increase of the flange width to thickness ratio, the ultimate flexural bearing capacity becomes smaller, the smaller trend is gentle, the greater the flange width to thickness ratio, the greater the damage degree on the flange. The failure mode is changed from distortion and local mixed failure to distortion failure, and the damage on flange plate is gradually aggravated, and the displacement ductility decreases with the increase of flange width to thickness ratio. Under axial compression condition, the failure of jointed member is a mixed mode of the section distortion and local buckling between the whole bending buckling and the filling plate, at the same time, the local buckling of the web is the first occurrence of the member. The width of the fill plate has a great influence on the compression performance of the composite member. When the width of the fill plate changes in the range of 210mm~330mm, the width of the fill plate increases with the width of the fill plate. The ultimate bearing capacity and axial compression stiffness of the members are increasing, and the displacement ductility increases with the width of the fill plate. (2) the spacing of the fill plate has a great influence on the assembly members. When the spacing of the fill plate changes in the range of 197mm~356mm, the displacement ductility decreases with the increase of the spacing of the fill plate. The ultimate bearing capacity and the axial compression stiffness of the members are increasing, and the change of the spacing between the fill plates only affects the failure degree of the members, and does not change the failure mode of the members. Finally, they are all web failure with certain flange failure. The displacement ductility increases with the decrease of the spacing of the fill plate. The influence of flange width to thickness ratio is obvious. When the flange width to thickness ratio changes in the range of 35 ~ 48, the ultimate bearing capacity of the flange increases with the increase of the flange width to thickness ratio. The larger the flange width to thickness ratio is, the greater the flange damage degree is, but the displacement ductility increases with the increase of the flange width thickness ratio, but does not change the failure mode of the member.
【學(xué)位授予單位】：山東建筑大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU392.1

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