【摘要】：冷彎薄壁型鋼因其具有截面特性優(yōu)良、便于工廠化生產(chǎn)、重量輕等優(yōu)點(diǎn)而在建筑行業(yè)中備受青睞。穩(wěn)定問題一直以來都是鋼結(jié)構(gòu)設(shè)計中的核心問題,對于冷彎薄壁型鋼構(gòu)件來說,穩(wěn)定問題更加重要。冷彎薄壁型鋼可能出現(xiàn)的屈曲模式有局部屈曲、畸變屈曲、整體屈曲。隨著材料的屈服強(qiáng)度越來越高,構(gòu)件厚度越來越薄,截面形式日趨復(fù)雜,畸變屈曲更容易成為控制構(gòu)件承載力的屈曲模式。以往對于冷彎薄壁型鋼受彎構(gòu)件畸變屈曲性能的研究,多集中在構(gòu)件受純彎作用這一荷載形式,對構(gòu)件受線性彎矩和翼緣承受均布力等典型荷載形式的研究非常少。為此,本文對受彎構(gòu)件畸變屈曲的進(jìn)行更加全面深入的研究。 首先,本文選取了經(jīng)大量研究證實的易發(fā)生畸變屈曲的截面,進(jìn)行了有限元分析,并將分析結(jié)果與有限條計算軟件計算結(jié)果進(jìn)行對比,誤差在5%以內(nèi),證實模型建立的有效性,為下一步的有限元研究提供依據(jù)。 其次,用經(jīng)驗證的有限元模型對冷彎薄壁卷邊槽鋼受彎構(gòu)件的畸變屈曲性能進(jìn)行了分析,包括線彈性分析和彈塑性分析。線彈性分析的主要內(nèi)容為截面參數(shù)及構(gòu)件長度對受純彎、線性彎矩、均布力作用的冷彎薄壁卷邊槽鋼構(gòu)件畸變屈曲模態(tài)、畸變屈曲彎矩的影響,并對比分析了同種截面形式下作用不同荷載形式時,畸變屈曲模態(tài)及畸變屈曲承載能力之間的區(qū)別和關(guān)系。彈塑性分析主要研究了冷彎薄壁槽鋼構(gòu)件的極限承載力,并與直接強(qiáng)度法計算結(jié)果進(jìn)行對比。 最后,研究了蒙皮支撐對冷彎薄壁卷邊槽鋼受彎構(gòu)件穩(wěn)定性能的影響。研究內(nèi)容主要包括蒙皮支撐分別位于構(gòu)件受拉翼緣、受壓翼緣一側(cè)時對槽鋼受彎構(gòu)件穩(wěn)定性能的影響；有蒙皮支撐的槽鋼梁間距不同、根數(shù)不同時對槽鋼受彎構(gòu)件穩(wěn)定性能的影響。而后分析了蒙皮厚度對冷彎薄壁卷邊槽形受彎構(gòu)件穩(wěn)定性能的影響。
[Abstract]:Cold-formed thin-walled steel is very popular in the construction industry because of its excellent cross-section characteristics, convenient for industrial production, light weight and so on. The stability problem has always been the core problem in the steel structure design, and the stability problem is more important for the cold-formed thin-walled steel members. There are local buckling, distortion buckling and global buckling of cold-formed thin-walled steel. With the increasing yield strength of the material, the thickness of the member becomes thinner and thinner, the form of section becomes more and more complex, and the distortion buckling is more easily become the buckling mode to control the bearing capacity of the member. In the past, the research on the distortion buckling behavior of cold-formed thin-walled steel members was mainly focused on the load form of pure bending, but the research on the typical load forms such as linear bending moment and flange bearing uniform force was very rare. Therefore, the buckling of flexural members is studied more thoroughly in this paper. First of all, this paper selects the section which is proved by a lot of research to be prone to distortion buckling, carries on the finite element analysis, and compares the analysis result with the finite strip calculation result, the error is less than 5%. The validity of the model is verified, which provides the basis for the next finite element research. Secondly, the distortion buckling behavior of cold-formed thin-walled crimped channel members is analyzed by using the verified finite element model, including linear elastic analysis and elastic-plastic analysis. The main content of linear elastic analysis is the effect of section parameters and member length on distortion buckling mode and bending moment of cold-formed thin-walled crimped channel members subjected to pure bending, linear moment and uniform force. The difference and relationship between the mode of distortion buckling and the bearing capacity of distortion buckling are compared and analyzed. The ultimate bearing capacity of cold-formed thin-walled channel members is studied by elastic-plastic analysis, and the results are compared with those calculated by direct strength method. Finally, the influence of skin bracing on the stability of cold-formed thin-walled crimped channel members is studied. The research mainly includes the influence of skin bracing on the tensile flange of the member, and the influence of the compression flange on the stability of the channel steel bending member. The influence of different spacing and root number on the stability of channel beam with skin support is discussed. Then the influence of skin thickness on the stability of cold-formed thin-walled crimped grooves is analyzed.
【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】：TU392.1

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