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在弯扭失稳(LTB)和受压翼缘局部失稳(FLB)2种极限状态下,根据钢结构规范(AISCLRFD360-10)得到的具有紧密腹板且没有紧密翼缘或细长翼缘的I型梁截面的名义受弯承载力可能偏低。该方法的主要假设是LTB和FLB是2个独立的状态,之间无相互作用。本文采用ABAQUS建立三维有限元模型对没有紧密翼缘或细长翼缘的I型梁进行非线性分析。通过估算具有不同翼缘长细比的局部屈曲的I型组合钢梁的抗弯承载力,以验证AISC-LRFD方法的适用性。研究发现整体和局部屈曲能力相差加大,故应考虑FLB和LTB之间的相关屈曲作用;对本文给出的梁还应考虑其局部屈曲后性能。
In the two extreme states of buckling instability (LTB) and partial flange failure (FLB) of the compression flange, the tight web with tight webs or slender flanges according to the code for steel structure (AISCLRFD360-10) The I-beam cross-section of the nominal bending capacity may be low. The main assumption of this method is that LTB and FLB are two independent states with no interaction between them. In this paper, ABAQUS is used to establish a three-dimensional finite element model for non-linear analysis of I-beams without tight flanges or slender flanges. The applicability of the AISC-LRFD method was verified by estimating the flexural capacity of I-type composite beams with local buckling with different slenderness ratios. The study found that the global and local buckling ability is different, so the relevant buckling effect between FLB and LTB should be considered. The beam given in this paper should also consider the local buckling performance.