不同截面形式高强冷弯薄壁槽钢构件受弯承载力试验研究

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。

Experimental study on bending strength of high-strength cold-formed thin-walled steel channel section members

Bending behaviors of 550 MPa high-strength cold-formed thin-walled steel channel section flexural members with stiffener types and edge stiffener types were studied through the static experiments of 36 specimens, where the three types of stiffening schemes were without stiffeners, with intermediate V type stiffeners in the flanges and with intermediate V type stiffeners in the flanges and the web respectively, and the three types of edge stiffeners were upright, inclined and complex edge stiffeners respectively. It is shown that stiffener types and edge stiffener types are key factors that influence the member’s bending strength and buckling modes. Compared with the case without stiffeners, the bending strength of members with intermediate V types is increased about 30% to 70% because the element width-to-thickness ratio is reduced effectively. In the same stiffener, bending strength of short (upright and inclined) edge stiffeners specimens is the maximum, bending strength of complex edge stiffeners specimens takes the second place, and bending strength of long (upright and inclined) edge stiffeners specimens is the minimum. Local buckling, distortional buckling and interaction of local and distortional buckling are observed in the test. The tests were simulated by finite element and the simulation results agree well with the test results.