【摘要】：穩(wěn)定問題在冷彎薄壁型鋼結(jié)構(gòu)設(shè)計中占有重要地位。不斷推陳出新的截面形式和超薄、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。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,對某些新型截面形式受壓構(gòu)件穩(wěn)定性能的理論和試驗研究成果還比較少見。近年來,直接強(qiáng)度法得到了國內(nèi)外學(xué)者的重視,而應(yīng)用直接強(qiáng)度法求解構(gòu)件極限承載力時,彈性屈曲臨界力的求解又是其中重要的一步,而對于新型截面冷彎薄壁型鋼的畸變屈曲臨界力的簡化計算公式,相關(guān)研究成果目前還比較少見。 本課題采用試驗與理論分析相結(jié)合的方法,以設(shè)計應(yīng)用為目標(biāo),針對上述問題開展了較系統(tǒng)的研究,較全面地掌握了新型截面復(fù)雜卷邊冷彎薄壁型鋼軸心受壓構(gòu)件的穩(wěn)定性能,推出了此類構(gòu)件的畸變屈曲臨界力的簡化計算方法。 針對目前新型截面冷彎薄壁復(fù)雜卷邊槽鋼簡支構(gòu)件承載力方面的試驗資料比較缺乏,本文設(shè)計了復(fù)雜卷邊槽鋼、∑形復(fù)雜卷邊槽鋼、腹板中間V型加勁復(fù)雜卷邊槽鋼3種截面形式共計18根軸心受壓簡支柱的承載力試驗。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。試驗研究和有限元分析結(jié)果表明,板件中間加勁肋的存在對軸壓試件的極限承載力和失穩(wěn)模式影響顯著。此外,在考慮幾何與材料非線性的情況下,將ANSYS有限元程序分析結(jié)果與試驗結(jié)果進(jìn)行了對比,兩者吻合良好。研究內(nèi)容為后續(xù)理論研究工作的進(jìn)一步開展打下了良好的基礎(chǔ),并提供了有力的試驗依據(jù)。 應(yīng)用有限條分析軟件CUFSM對新型截面冷彎薄壁復(fù)雜卷邊槽鋼構(gòu)件進(jìn)行了大量的數(shù)值模擬,分析了各參數(shù)對構(gòu)件彈性畸變屈曲臨界應(yīng)力的影響。結(jié)合上述構(gòu)件的分析結(jié)果,通過數(shù)學(xué)擬合的方法,得出了針對∑形復(fù)雜卷邊槽鋼、腹板中間V型加勁復(fù)雜卷邊槽鋼的彈性畸變屈曲臨界力的簡化計算公式,可用于實際的工程設(shè)計中
[Abstract]:The stability problem plays an important role in the design of cold-formed thin-walled steel structures. The application of new cross-section and ultra-thin, high-strength steel has brought many new stability problems, such as the local, distortion and ultimate bearing capacity of compression members with different cross-section forms. At the same time, with the complication of section form, distortion buckling will control the ultimate bearing capacity of members. At present, theoretical and experimental studies on the stability of some new types of compression members are rare. In recent years, the direct strength method has been paid much attention by scholars at home and abroad, and the solution of the critical force of elastic buckling is an important step in applying the direct strength method to calculate the ultimate bearing capacity of members. However, the simplified formula for calculating the critical force of distortion buckling of a new type of cold-formed thin-walled section steel is relatively rare at present. This paper adopts the method of combining experiment and theoretical analysis, aiming at the design and application, and aiming at the above problems, carries out more systematic research, and comprehensively grasps the stability performance of the new type of cold-formed thin-walled steel axial compression members with complicated section. A simplified method for calculating the critical force of distortion buckling is presented. In view of the lack of experimental data on the bearing capacity of the new section cold-formed thin-walled complicated crimping channel steel, this paper designs the complex crimped channel steel and 鈭，

本文編號：2240652