本文選題：腹板開孔 + 復(fù)雜卷邊槽鋼��； 參考：《沈陽建筑大學(xué)》2014年碩士論文

【摘要】：隨著新型截面形式的出現(xiàn)以及超薄、高強(qiáng)鋼材的應(yīng)用,帶來了許多新的穩(wěn)定問題,如不同截面形式受壓構(gòu)件的局部、畸變和整體相關(guān)屈曲下的極限承載力問題,以及相應(yīng)屈曲模式對構(gòu)件變形性能的影響問題等。同時,隨著構(gòu)件截面形式的復(fù)雜化,畸變屈曲將對構(gòu)件的極限承載力起到控制作用。目前,國內(nèi)外對不開孔冷彎薄壁型鋼軸壓構(gòu)件的研究已較為成熟,而對開孔軸壓構(gòu)件還有待深入研究。且開孔構(gòu)件的研究多集中在普通卷邊槽鋼截面上,對復(fù)雜卷邊開孔軸壓構(gòu)件的研究較為少見。針對目前的研究現(xiàn)狀,本文以不同截面形式的腹板開孔薄壁鋼軸壓構(gòu)件為研究對象,分別對復(fù)雜卷邊槽鋼、∑形復(fù)雜卷邊槽鋼兩種截面形式,共10根腹板開孔軸壓簡支柱進(jìn)行了承載力試驗。研究了此類復(fù)雜截面軸心受壓構(gòu)件的極限承載力、失穩(wěn)模式及變形等特性。試驗結(jié)果表明,與相同用鋼量下的腹板開孔復(fù)雜卷邊槽鋼相比,腹板開孔∑形復(fù)雜卷邊槽鋼軸壓構(gòu)件的承載效率可提高30%～50%左右。與相同條件下的不開孔軸壓構(gòu)件變形相比,開孔構(gòu)件的破壞模式基本不變,但破壞位置多發(fā)生在孔洞附近。利用ANSYS有限元軟件對試驗進(jìn)行模擬分析,模擬結(jié)果與試驗結(jié)果吻合良好。以此為基礎(chǔ),采用有限元模擬對比了相同截面形式下腹板開孔和不開孔軸壓構(gòu)件的承載效率和應(yīng)力云圖,結(jié)果表明,與同截面的不開孔構(gòu)件相比,腹板開孔復(fù)雜卷邊槽鋼的承載效率平均下降6.15%,腹板開孔∑形復(fù)雜卷邊槽鋼的承載效率平均下降25.57%�？锥吹拇嬖诟淖兞藰�(gòu)件的應(yīng)力分布情況,較大應(yīng)力區(qū)域和最大應(yīng)力點均出現(xiàn)在孔洞附近。此外,改變翼緣寬度、板材厚度、構(gòu)件長度等參數(shù),對共36根變參數(shù)開孔構(gòu)件進(jìn)行模擬分析研究。研究結(jié)果表明,翼緣寬度的增大會加大應(yīng)力云圖中翼緣的較大應(yīng)力范圍。板材厚度的增加會加大開孔構(gòu)件孔洞處的變形幅度。構(gòu)件長度的改變會影響構(gòu)件的屈曲半波長度,進(jìn)而改變構(gòu)件的失穩(wěn)模式。同時,研究了國外計算特定截面形式開孔構(gòu)件極限承載力的DSM法,并采用此計算方法計算了18個腹板開孔復(fù)雜卷邊槽鋼截面構(gòu)件的極限承載力,發(fā)現(xiàn)計算結(jié)果與模擬結(jié)果較為接近。拓展了DSM計算方法的適用范圍。
[Abstract]:With the emergence of new cross-section and the application of ultra-thin and high-strength steel, many new stability problems have been brought about, such as the local, distortion and ultimate bearing capacity of different cross-section compression members under the whole dependent buckling. And the influence of the corresponding buckling mode on the deformation performance of the member, and so on. At the same time, with the complication of section form, distortion buckling will control the ultimate bearing capacity of members. At present, the research of cold-formed thin-walled steel axial compression members without opening holes has been more mature, but the axial compression members of open-hole axial compression members need to be further studied. The research of perforated components is mostly focused on the section of common crimped channel steel, and the research on complicated crimping perforated axial compression members is rare. In view of the present research situation, this paper takes the thin-walled steel axial compression members with different cross-section forms as the research object, respectively for the complicated crimped channel steel and 鈭，

本文編號：2025876