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进行了48根屈服强度550MPa高强冷弯薄壁型钢卷边槽形截面偏心受压构件试验,考虑了不同截面形式、厚度、长细比和荷载偏心方式的影响,研究了这类偏心受压构件的破坏模式、承载力影响因素以及构件承载力计算方法。结果表明:高强冷弯薄壁型钢偏压构件由于材料强度高,截面宽厚比较大,局部屈曲和畸变屈曲的影响较大,我国规范仅考虑了局部屈曲的影响而没有全面考虑畸变屈曲的影响,这使得部分发生畸变屈曲的试件计算结果偏于不安全,但又对不发生畸变屈曲的长细比较大的构件偏于保守。最后,在试验和现有规范方法比较分析的基础上,提出了一种适用于高强冷弯薄壁型钢偏压构件极限承载力的建议计算方法。该建议方法计算所得结果与试验结果吻合较好,且安全可靠,可供设计参考。
Forty-eight eccentrically-compressed members of 550 MPa high-strength cold-formed thin-walled steel with curled-groove cross-section were tested, and the effects of different cross-sectional forms, thicknesses, slenderness ratios and load eccentricities were considered. The failure mode, the influence factors of bearing capacity and the calculation method of bearing capacity of members. The results show that the high-strength cold-formed thin-walled steel beam biasing members have great influence on local buckling and distorted buckling due to high material strength, large cross-section width and thickness, and the influence of local buckling is not considered in our country’s code. This makes the calculated partial buckling distortion of the specimen partial insecure, but not distorted buckling slender larger components tend to be conservative. Finally, based on the comparative analysis between the test and the existing standard methods, a new calculation method is proposed for the ultimate bearing capacity of high-strength cold-formed thin-walled steel. The proposed method calculates the results in good agreement with the experimental results, and is safe and reliable for design reference.