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针对10根铝合金工字形大截面受弯构件进行局部稳定试验研究。重点对构件的破坏形态、局部屈曲后承载力、荷载-竖向位移曲线以及荷载-应变曲线进行研究。并建立有限元分析模型对试验进行模拟计算。试验中6个试件发生受压局部屈曲,腹板发生明显凸起;4个试件发生剪切屈曲,形成拉力带。研究结果表明:板件宽厚比越大,构件中材料强度发挥越不充分;布置跨中加劲肋的构件其承载力会大幅度提高;构件的腹板高厚比越大,其屈曲时应力水平越低,局部失稳发生后承载力提升的空间越大;有限元分析结果与试验结果吻合良好。
Local Stability Test of 10 Al-shaped I-shaped Large-section Bending Members. The failure mode, the bearing capacity after local buckling, the load-vertical displacement curve and the load-strain curve are emphatically studied. And the establishment of finite element analysis model to simulate the experiment. Six specimens under test suffered local buckling under pressure and significant web bulge occurred. Four specimens were buckled and buckled, forming a tension zone. The results show that the greater the ratio of thickness to thickness is, the less the strength of the material in the component is exerted. The bearing capacity of the members with mid-span stiffeners will be greatly improved. The greater the ratio of web thickness to thickness, the stress level The lower the space for the bearing capacity to increase after the local instability occurs, the result of the finite element analysis is in good agreement with the experimental results.