波形钢腹板抗剪性能的研究

为了研究波形钢腹板的抗剪受力性能,首先设计了4根波形钢腹板H型钢梁并进行屈曲加载试验,掌握了波形钢腹板屈曲的基本特征;统计国内外已建波形钢腹板组合桥的波形钢腹板尺寸参数、并对弹性屈曲强度的计算进行了分析,建议了弹性屈曲强度简化计算公式和适用范围;考虑局部弹性屈曲强度要小于整体弹性屈曲强度等参数范围,合理选取一批试验数据对Yi、聂建国等提出的波形钢板非线性剪切屈曲强度计算公式进行了对比分析,并通过ANSYS有限元程序对本文部分试验结果进行了分析验证.结果表明:波形钢腹板主要承担剪力且剪应力沿高度均匀分布;几何初始缺陷对其剪切屈曲强度的影响较明显;在工程应用范围内,文中建议的弹性屈曲强度和非线性剪切屈曲强度公式与试验值和有限元分析值吻合较好,精确度较高,可供工程设计参考.

Research on Shear Mechanical Property of Corrugated Steel Webs

To study the shear mechanical property of corrugated steel webs, four H-shaped steel beams with trapezoidal corrugated steel webs were designed and tested to obtain the shear behavior of corrugated steel webs. In addition, the elastic bucking strength of the corrugated steel webs was discussed according to statistical data of their dimensions for the as-built PC composite box girders around the world. Then, we proposed the simplified computational formulae and the corresponding scope. Furthermore, considering that the local elastic bucking strength is less than global elastic bucking strength, the formulae for calculating the nonlinear shear strength presented by Yi and NIE were studied on the basis of some test results, and the test results were verified by comparing the analysis results of ANSYS software. It is concluded that the shear force is mainly borne by the corrugated steel webs and the distribution of the shear stress along the height of the web is uniform. And the shear capacity of corrugated steel webs will be greatly affected by the initial imperfections. What is more, the proposed computational formulae for the elastic bucking strength and nonlinear shear strength are in perfect accordance with the model test results and the numerical analysis results, so they can provide a reference for practical structural design.