楔形蜂窝工字钢压弯构件静力性能研究

Static behavior of cantilever tapered castellated steel I-members

为了节省钢材、提高构件的刚度和强度,在楔形构件和蜂窝梁的基础上提出了楔形蜂窝构件.介绍了楔形蜂窝构件的制作方法,采用试验研究了楔率和开孔尺寸对悬臂楔形蜂窝构件刚度和抗弯承载力的影响.在试验研究的基础上,建立楔形蜂窝构件的有限元模型,研究了悬臂楔形蜂窝构件塑性区域的应力和应变的分布情况.研究结果表明,将H型钢切割制成楔形蜂窝构件,抗弯刚度和强度明显提高.悬臂楔形蜂窝构件的极限承载力和刚度主要取决于构件大头的截面高度.当孔洞大小相等时,楔率增大,制成的楔形蜂窝构件大头截面变高,构件的刚度增大.当轴压比较小时,悬臂楔形蜂窝压弯构件可以近似的采用塑性铰模型;当轴压比较大时,利用塑性铰模型分析是不合适的.

To save steels and improve the bending stiffness and capacity of steel members, H-section steel can be made into tapered castellated members by cutting in its web along a special line and welding after rearrangement. Experiments on these cantilever beam-columns with different opening sizes and tapered ratios were performed under static loading. Based on the experimental results, finite element analyses of tapered castellated members were performed. The results showed that the ultimate bending strength of cantilever tapered castellated member increases with the increase of tapered ratio and decreases with the increase of opening size. The ultimate bending strength mainly depends on the section size at the big end of the members. The plastic hinge model can also be used for the cantilever tapered castellated beam-columns when the axial compression ratio is below a certain value.