论文部分内容阅读
对多边形薄壁钢管柱的局部屈曲进行试验研究。对3种不同截面形式(八边形、十二边形和十六边形)的6根柱进行轴向压缩试验。对于每种截面,均考虑其长细比和宽厚比的影响,并且在试验前精确测量材料的几何缺陷。试验结果显示材料的局部屈曲破坏形式取决于其截面形状。此外,材料的长细比是影响局部屈曲的主要因素。依据22组多边形薄壁钢管柱的轴心压缩试验结果对ASCE48-05、EC3、Migita和Fukumoto设计方程局部屈曲性能的预测结果进行评估。指出设计方程的缺点,Loov方程使用基于极限应力概念的新参数对方程进行了调整,使其能够适用于多边形管柱。与试验结果进行对比分析验证了新建方程的准确性。
Experimental study of local buckling of polygonal thin-walled steel tubular columns. Three columns with different cross sections (octagonal, dodecagonal and hexagonal) were tested for axial compression. For each section, the effect of slenderness ratio and aspect ratio is considered, and the geometric imperfections of the material are accurately measured before the test. The experimental results show that the local buckling damage of the material depends on its cross-sectional shape. In addition, the slenderness ratio of the material is the main factor affecting the local buckling. The local buckling predictions of ASCE48-05, EC3, Migita and Fukumoto equations were evaluated based on the axial compressive test results of 22 groups of polygonal thin-walled steel tubular columns. Pointed out the shortcomings of the design equations, the Loov equation uses the new parameters based on the concept of ultimate stress to adjust the equation so that it can be applied to polygonal columns. Compared with the test results, the accuracy of the new equation is verified.