Huangfu Shuang-E, Tao Zhong, Zhang Zhenglin, Wang Zihao, Zhang Ji
Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, China.
City College, Kunming University of Science and Technology, Kunming 650051, China.
Materials (Basel). 2024 Dec 28;18(1):91. doi: 10.3390/ma18010091.
The failure mode of thin-walled C-channel beams typically manifests as premature local buckling of the compression flange, leading to insufficient utilization of material strength in both the flange and the web. To address this issue, this study adopts the approach of increasing the number of bends to reinforce the flange and adding V-shaped stiffeners in the middle of the web to reduce the width-to-thickness ratio of the plate elements, thereby delaying local buckling and allowing for greater plastic deformation. However, the challenge lies in the irregular cross-sectional shape and complex buckling patterns. Therefore, this paper aims to explore a suitable cross-sectional form to expand the application of stainless steel members. Subsequently, three-point bending tests were conducted on the optimally designed stainless C-channel beam with folded flanges and mid-web stiffeners. The finite element simulation results were compared and analyzed with the experimental results to validate the model's effectiveness. After verifying the correctness of the finite element model, this study conducted numerical parameterization research to investigate the effects of the shear span ratio, complex edge stiffeners, web height-thickness ratio, and V-shaped stiffener size on the shear performance of stainless steel folded flange C-beams. The results show that changing the shear span ratio has a significant impact on the shear capacity and vertical deflection deformation of components; increasing the web height-thickness ratio can enhance the shear capacity of the component; elevating the V-shaped stiffener size can slightly improve the shear capacity of components; and for the stainless steel C-shaped beam with folded flanges and intermediate stiffening webs, adding edge stiffeners cannot remarkably promote the shear capacity of the component.
薄壁C形槽钢梁的失效模式通常表现为受压翼缘过早发生局部屈曲，导致翼缘和腹板中的材料强度无法得到充分利用。为解决这一问题，本研究采用增加弯折数量以加固翼缘，并在腹板中部添加V形加劲肋的方法，来减小板件的宽厚比，从而延缓局部屈曲并允许更大的塑性变形。然而，挑战在于其不规则的横截面形状和复杂的屈曲模式。因此，本文旨在探索一种合适的横截面形式，以扩大不锈钢构件的应用范围。随后，对优化设计的带折叠翼缘和腹板中部加劲肋的不锈钢C形槽钢梁进行了三点弯曲试验。将有限元模拟结果与试验结果进行比较和分析，以验证模型的有效性。在验证了有限元模型的正确性之后，本研究进行了数值参数化研究，以探讨剪跨比、复杂边缘加劲肋、腹板高厚比和V形加劲肋尺寸对不锈钢折叠翼缘C形梁抗剪性能的影响。结果表明，改变剪跨比对构件的抗剪承载力和竖向挠曲变形有显著影响；增大腹板高厚比可提高构件的抗剪承载力；增大V形加劲肋尺寸可略微提高构件的抗剪承载力；对于带折叠翼缘和中间加劲腹板的不锈钢C形梁，添加边缘加劲肋并不能显著提高构件的抗剪承载力。
