带约束拉杆方形截面钢管混凝土短柱抗震性能试验研究  

Experimental study on seismic behavior of square concrete-filled steel tubular stub columns with binding bars

作　　者：王英涛[1] 蔡健[2] 龙跃凌[3] 杨春[2] 陈庆军[2] 左志亮[1] 

机构地区：[1]华南理工大学土木与交通学院,广东广州510641 [2]华南理工大学亚热带建筑科学国家重点实验室,广东广州510641 [3]广东工业大学土木与交通工程学院,广东广州510006

出　　处：《建筑结构学报》2015年第7期18-25,34,共9页Journal of Building Structures

基　　金：广州市珠江科技新星专项(2012J2200100);亚热带建筑科学国家重点实验室项目(2013ZC20)

摘　　要：为研究带约束拉杆方形截面钢管混凝土短柱的抗震性能,进行了2个不带约束拉杆和8个带约束拉杆方形截面钢管混凝土短柱试件的拟静力试验。试件的主要变化参数为轴压比和约束拉杆间距。研究结果表明:钢管板件宽厚比为33.3、构件剪跨比为3的方形截面钢管混凝土短柱的滞回曲线饱满,没有明显的捏缩;带约束拉杆试件的承载能力、极限变形能力及耗能能力均优于不带约束拉杆试件;轴压比由0.2增加到0.6,试件的极限变形能力降低,但耗能能力有所提高;约束拉杆纵向和水平间距同时从100 mm减小到50 mm,可明显提高试件的承载能力、极限变形能力和刚度,减缓承载力退化和刚度退化,改善柱的抗震性能;减小约束拉杆纵向间距对提高试件耗能能力和承载力有明显作用,减小约束拉杆水平间距对提高极限变形能力有一定的影响。To study the seismic behavior of square concrete-filled steel tubular （CFT） stub columns with binding bars, experiments on two specimens of square CFT without binding bars and eight specimens with binding bars were carried out under cyclic lateral load. The main experimental parameters were the axial compression ratio and the spacing of binding bars. The results indicate that square CFT stub columns, with width-to-thickness ratio 33.3 and shear-span ratio 3, have the plump hysteretic curves, having no significant pinch phenomenon. The bearing capacity, ultimate deformation capacity and energy dissipation of a square CFT stub column with binding bars are remarkably higher than that without binding bars. The ultimate deformation capacity of the specimens with binding bars decreases, but energy dissipation capacity increases slightly as the axial compression ratio increases from 0.2 to 0.6. The bearing capacity, the ultimate deformation capacity and rigidity of the specimens are improved, the strength and stiffness degradations slow down by decreasing the longitudinal and horizontal spacing of binding bars from 100 mm to 50 mm, then the seismic performance of the columns is also improved. The energy dissipation and bearing capacity are obviously improved by decreasing the longitudinal spacing of binding bars, and the ultimate deformation capacity is slightly improved by decreasing the horizontal spacing of binding bars.

关 键 词：方形截面钢管混凝土短柱 约束拉杆 拟静力试验 抗震性能 

分 类 号：TU398.9[建筑科学—结构工程] TU317.1