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对焊接H形和槽形截面的柱进行了一系列压力试验,这些柱采用厚度为6·0 mm,名义屈服应力为240 MPa的软钢板制成。从理论上和试验中对这些受压构件在非线性局部和整体屈曲交互作用下的极限强度和性能进行了研究。压力试验表明,局部和整体屈曲交互面对薄壁焊接钢柱截面有较大的负面影响。近期发展起来的DSM方法,对冷加工钢截面的设计,可作为有效宽度法的备选方法,最近已由NAS( AISI ,2004)提出,并由焊接钢截面的试验结果进行了校验。证明了当局部屈曲和弯曲同时或者近乎同时发生时,可采用直接强度法预测焊接截面的极限强度。
A series of pressure tests were performed on the columns welded with H and Slotted sections made of mild steel with a nominal thickness of 6.0 mm and a nominal yield stress of 240 MPa. The ultimate strength and performance of these compression members under the interaction of nonlinear local and global buckling are studied theoretically and experimentally. Pressure tests show that the local and global buckling interactions have a significant negative impact on the cross-section of thin-walled welded steel columns. The recently developed DSM method, as an alternative to the effective width method, can be used as an alternative to the effective width method, recently proposed by NAS (AISI, 2004) and verified by the test results of the welded steel cross-section. It is proved that the direct strength method can be used to predict the ultimate strength of the welded section when the local buckling and bending occur at or near the same time.