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对取自30种不同截面、不同厚度、不同钢材型号、不同厂家生产的冷弯厚壁矩形和方形钢管的568个试件进行了材料性能试验研究.结果表明:焊缝部位的屈服强度和极限强度相对于邻边均有提高;角部屈服强度提高系数随型钢中心线长与弯角内径之比的增大而增大,而各参数对极限强度的影响较小;焊缝两邻边间的强度差异很小.基于研究结果,提出了冷弯矩形和方形钢管屈服强度、极限强度、强屈比和伸长率沿截面的分布模型.当相应冷弯型钢截面的梁、柱强度和稳定分析中需要考虑冷弯效应的影响时,可以应用此分布模型.
The material properties of 568 specimens from 30 different cross-sections, different thicknesses, different types of steel, and cold-formed thick-walled rectangular and square steel tubes produced by different manufacturers were studied. The results show that the yield strength and ultimate limit The strength increases relative to the adjacent edge; corner yield strength increase coefficient increases with the increase of the ratio of the centerline length of the section steel and the inner diameter of the bending angle, and the influence of each parameter on the ultimate strength is small; The strength difference of the cold-formed section is very small.According to the research results, the yield strength, ultimate strength, strength-yield ratio and elongation along the cross-section of the cold-formed rectangular and square steel tubes are presented.When the beam and column strength and stability This distribution model can be applied when the effects of cold-bending effects need to be considered in the analysis.