钢管混凝土格构短柱轴力弯矩相关曲线的试验研究

进行了13根以偏心率为参数的钢管混凝土格构短柱试验,其中11根为偏心受压,2根为偏心受拉.试验结果表明,腹杆受力较小,处于弹性阶段,试件按柱肢破坏形式可分为压坏型和拉坏型.对于偏压试件而言,当偏心率小于界限偏心率时,为压坏型;大于界限偏心率时,为拉坏型.对于偏心受拉试件而言,均为拉坏型.继而对我国主要的钢管混凝土结构设计规范的有关计算方法进行了分析,提出了综合不同规程、更为精确的钢管混凝土格构短柱轴力弯矩相关方程.

Experimental research on interaction curves of concrete filled steel tubular laced short columns

Total of 13 concrete filled steel tubular(CFST) laced columns with experimental parameter of eccentrically ratio were tested,in which 11 of them were subjected to eccentrically compressive loads and other 2 to eccentrically tensile loads.Test results indicate that the internal forces of web members are small and they are under elasticity status in whole process of the testing.Based on the failure modal of longitudinal elements,the failure modal of laced columns can be divided into compressive failure modal and tensile failure modal.For columns subjected to eccentrically compressive loads,the failure modal is compressive failure modal when eccentrically ratio is smaller than critical eccentrically ratio,and tensile failure modal when eccentricity is larger than critical eccentrically ratio.For columns subjected to eccentrically tensile loads,the failure modal is tensile failure modal.The calculating methods of laced columns in major Chinese CFST design codes are analyzed.A more precise calculation method for axial force and bending moment interaction curves of CFST laced short columns is presented through a combination of different code methods.