冷弯薄壁型钢C形截面构件受弯承载力试验研究

为了研究冷弯薄壁型钢构件的受弯性能,对卷边形式为直卷边、斜卷边和复杂卷边的冷弯薄壁型钢C形截面受弯构件进行了试验研究。共计24个试件,分为12组试验,其中纯弯试验和非纯弯试验各6组。试验结果表明,卷边形式是影响构件受弯承载力的重要因素。试验中出现了局部屈曲、畸变屈曲以及局部和畸变的相关屈曲。对比两种受弯状态下的承载力发现,非纯弯时试件的承载力比纯弯时均有所提高,但提高的幅度和试件的屈曲模式有关,当发生畸变屈曲时提高得较多,而发生局部屈曲时提高得较少。利用有限元程序ANSYS对试验进行模拟,模拟结果与试验结果吻合较好。

Experimental study on bending strength of cold-formed steel C-section members

In order to investigate bending behavior of cold-formed steel members,bending tests of cold-formed steel Csection flexural members with upright,inclined and complex edge stiffeners were conducted,in which 24 specimens that divided into 12 tests including 6 pure bending tests and 6 non-pure bending tests.The experimental results show that the edge stiffener is a key factor that influence the member'S bending strength.Local buckling,distortional buckling and interaction of local and distortional buckling were observed in the tests.Comparison of the bending strengths under the two bending states show that the bending strength under non-pure bending is higher than which under pure bending,but the increased magnitude is related to the buckling modes.The increased magnitude is great when the buckling mode is distortional buckling and which is little when the buckling mode is local buckling.The tests were simulated by finite element program of ANSYS and the simulation results show good agreement with the experimental results.