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本文分析了两端铰接偏心压杆,在端弯矩相等时的弯扭屈曲问题。假定材料的应力——应变关系为理想弹塑性。取用制订《TJ17—74》规范时所用典型截面。分析中,考虑了截面在弹塑性阶段可能发生的五种状态,即:弹性阶段;爱压侧部分翼缘屈服;受压侧翼缘和部分腹板屈服;受压侧翼缘和部分腹板屈服,同时受拉侧部分翼缘屈服;受拉及受压两侧均为全部翼缘及部分腹板屈服。并与忽略翼缘厚馁影响的三种弹塑性状态的情况进行了对比。编制了计算稳定系数_1的计算程序。经与文献[1]中既有试验结果相比较,说明本文所得_1值与之较为符合。在理论计算的基础上,提出了简化方案。如应用本文_1值进行设计,较按《TJ17——74》规范可以提高一些设计的经济效果。本文可供修订钢结构设计规范时参考。
This paper analyzes the flexural-torsional buckling problems when the end bending moments are equal at both ends. It is assumed that the stress-strain relationship of the material is ideal elastoplasticity. Take the typical cross section used when formulating the “TJ17-74” specification. In the analysis, the five states that may occur in the elasto-plastic phase of the cross section are considered, namely: the elastic phase; the partial compression of the pressure side flange; the yield of the compression side flange and the partial web; the compression of the side flange and partial web yielding, At the same time, the part of the flange on the pull side is yielded; on both sides of the tension and compression, all the flanges and part of the web are yielded. And compared with the case of the three elasto-plastic states that ignore the effect of flange thickness. A calculation program for calculating the stability factor _1 has been prepared. Comparing with the existing experimental results in [1], it shows that the value of 1 obtained in this paper is more consistent with it. Based on theoretical calculations, a simplified scheme was proposed. If the application of this article _1 value design, according to the “TJ17-74” specification can improve the economic effect of some designs. This article is available for reference when revising the Steel Design Specification.