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对36个屈服强度为550 MPa的高强冷弯薄壁槽钢受弯试件进行静力试验研究,考虑了加劲形式和卷边形式对试件受弯性能的影响,其中加劲形式分为无加劲、翼缘中间V形加劲和翼缘及腹板中间V形加劲3种,卷边形式分为直卷边、斜卷边和复杂卷边3种。试验结果表明:加劲形式和卷边形式是影响试件受弯承载力和屈曲模式的重要因素;与无加劲形式相比,采用板件中间V形加劲有效减小了板件宽厚比,试件受弯承载力提高了30%~70%;同种加劲形式下,短(直、斜)卷边试件受弯承载力提高幅度最大,复杂卷边试件提高幅度次之,长(直、斜)卷边试件提高幅度最小;试验过程中试件发生了局部屈曲、畸变屈曲与局部和畸变相关屈曲。对试验进行了有限元模拟,模拟结果与试验结果吻合较好。
Thirty-six bending specimens of high-strength cold-formed thin-walled channel with yield strength of 550 MPa were studied in static test. The influence of stiffened form and curled form on flexural behavior of specimens was considered. V-shaped stiffener in the middle of the flange, and V-shaped stiffener in the middle of the flange and web. There are three types of curling, namely straight curling, oblique curling and complicated curling. The results show that the form of stiffener and curl are the important factors that affect the flexural capacity and buckling mode of the specimen. Compared with the non-stiffened form, Flexural capacity increased by 30% ~ 70%. Under the same stiffened form, the flexural strength of the short (straight, oblique) Oblique) curling the smallest increase in the specimen; test specimen during the occurrence of local buckling, distorted buckling and local and distortion related buckling. The finite element simulation of the experiment is carried out, and the simulation results are in good agreement with the experimental results.