新型截面冷弯薄壁型钢轴心受压构件稳定性能研究
发布时间：2018-09-13 08:48
【摘要】：稳定问题在冷弯薄壁型钢结构设计中占有重要地位。不断推陈出新的截面形式和超薄、高强钢材的应用,带来了许多新的稳定问题,如不同截面形式受压构件的局部、畸变和整体相关屈曲下的极限承载力问题。同时,随着构件截面形式的复杂化,畸变屈曲将对构件的极限承载力起到控制作用。目前,对某些新型截面形式受压构件稳定性能的理论和试验研究成果还比较少见。近年来,直接强度法得到了国内外学者的重视,而应用直接强度法求解构件极限承载力时,弹性屈曲临界力的求解又是其中重要的一步,而对于新型截面冷弯薄壁型钢的畸变屈曲临界力的简化计算公式,相关研究成果目前还比较少见。 本课题采用试验与理论分析相结合的方法,以设计应用为目标,针对上述问题开展了较系统的研究,较全面地掌握了新型截面复杂卷边冷弯薄壁型钢轴心受压构件的稳定性能,推出了此类构件的畸变屈曲临界力的简化计算方法。 针对目前新型截面冷弯薄壁复杂卷边槽钢简支构件承载力方面的试验资料比较缺乏,本文设计了复杂卷边槽钢、∑形复杂卷边槽钢、腹板中间V型加劲复杂卷边槽钢3种截面形式共计18根轴心受压简支柱的承载力试验。研究了此类复杂截面轴心受压构件的极限承载力、失稳模式及变形等特性。试验研究和有限元分析结果表明,板件中间加劲肋的存在对轴压试件的极限承载力和失稳模式影响显著。此外,在考虑几何与材料非线性的情况下,将ANSYS有限元程序分析结果与试验结果进行了对比,两者吻合良好。研究内容为后续理论研究工作的进一步开展打下了良好的基础,并提供了有力的试验依据。 应用有限条分析软件CUFSM对新型截面冷弯薄壁复杂卷边槽钢构件进行了大量的数值模拟,分析了各参数对构件弹性畸变屈曲临界应力的影响。结合上述构件的分析结果,通过数学拟合的方法,得出了针对∑形复杂卷边槽钢、腹板中间V型加劲复杂卷边槽钢的弹性畸变屈曲临界力的简化计算公式,可用于实际的工程设计中
[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，
本文编号：2240652
[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，
本文编号：2240652
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