摘要
本文用有限枳分法研究了钢柱脚在弯矩作用平面外的转动和翘曲约束对柱弯扭屈曲承载力的影响,提出了考虑这种影响时计算长度系数μ_y的建议值。
In this paper, the finite integral method is used to study the inclasticlateral-torsional buckling strength of the beam-columns with welded I-sectionsbuilt-up from flame cut plate. The column base is fitted on the foundation with four an-chorage bolts. The effect of various factors, such as residual stress, bending restraintsout of the plane of the applied moments and warping restraints of the column base on thelateral-torsional buckling strength is considered. Experimental testing of a few selectedspecimens was conducted to verify the lateral-torsional buckling strength of beam-col-umns. The theoretical results are quite close to the test ones. Based on the papametricanalysis, such as the effect of different restraint constants and various ratios of in-planeend moments, an effective length factor μ_y is recommended in the linear interaction outof the bending moment plane for design purpose.
关键词
钢
柱
弯扭屈曲
承载力
有限积分
bending / warping restraint
beam-column
lateral-torsional buckling
finite integral
