EXPERIMENTAL RESEARCH ON THE PERFORMANCE OF COMPOSITE CONFINED REINFORCED CONCRETE CIRCULAR COLUMN WITH MULTIPLE SPIRAL STIRRUPS UNDER AXIAL COMPRESSION
-
摘要: 为研究多重螺旋筋复合约束钢筋混凝土圆形截面短柱的轴压力学性能,以螺旋筋间距、钢筋笼间距、螺旋筋重数为变化参数,对8个短柱试件进行轴心受压试验。观察试件的破坏过程及形态,获得了其荷载-变形曲线、峰值荷载和峰值变形等力学性能指标,并分析不同变化参数对试件轴压力学性能的影响。研究结果表明:三重螺旋筋复合约束钢筋混凝土短柱的破坏过程及形态与两重螺旋筋复合约束钢筋混凝土短柱相似,但具有更大的初始压缩刚度和更好的延性和耗能能力,用钢量的增加并没有有效提高其承载力;增大螺旋筋间距,减少用钢量的同时并没有显著降低承载力,而峰值变形、初始压缩刚度、延性及耗能系数逐渐减小;增大钢筋笼间距,用钢量的减少幅度大于承载力的降低幅度,其延性及耗能能力得到提高,而峰值变形和初始压缩刚度没有表现出明显的规律。Abstract: In order to study the axial compression behavior of composite confined reinforced concrete circular column with multiple spiral stirrups, a total of 8 specimens were tested under axial compression. Three parameters including spiral stirrup spacing, steel cage spacing and number of spiral stirrups were taken into consideration. The failure process and mode of specimens were observed, and the load-deformation curve, peak load, and peak deflection were obtained. Furthermore, the effects of different parameters on axial compression behavior were analyzed. The results showed that the failure process and mode of circular columns with triple spiral stirrups were similar to those of circular columns with double spiral stirrups under axial compression. It had greater initial compression stiffness and better ductility and energy dissipation capacity, but increasing the amount of steel did not effectively improve its bearing capacity. Increasing the spacing of spiral stirrup could significantly reduce the steel consumption without significantly reducing the bearing capacity, while the peak deformation, initial compression stiffness, ductility and energy dissipation gradually decreased. With the increase of steel cage spacing, the reduction of steel consumption was greater than that of bearing capacity, and the ductility and energy dissipation capacity were improved, but the peak deformation and initial compression stiffness had no obvious regularity.
-
BING L,PARK R,TANAKA H. Stress-Strain Behaviour of High Strength Concrete Confined by Ultra High and Normal Strength Transverse Reinforcements[J]. ACI Structural Journal,2001,98(3):395-406. SHEIKH S A,TOKLUCU M T. Reinforced Concrete Columns Confined by Circular Spirals and Hoops[J]. ACI Structural Journal,1993,90(5):542-553. 陈志华,杜颜胜,周婷.配螺旋筋方钢管混凝土柱力学性能[J].建筑结构,2015,45(20):28-23. 张兴虎,郑晓龙,潘树宾,等.高强螺旋筋约束混凝土柱抗震性能试验[J].建筑科学与工程学报,2013,30(2):21-27. MANDER J B,PRIESTLEY M J N,PARK R. Theoretical Stress-Strain Model for Confined Concrete[J]. Journal of Structural Engineering,1988,14(8):1804-1826. 尹衍樑.矩形混凝土柱新的约束型式之研发(Ⅱ)外方内圆、组合螺箍及其衍生型式[J].土木工程学报, 2004,37(10):1-12. 徐小君.配置矩形螺箍筋对混凝土梁抗剪承载力影响的研究[D].徐州:中国矿业大学,2015. 苏俊省,王君杰,王文彪,等.高强度螺旋箍筋约束下混凝土圆柱的抗震性能试验研究[J].地震工程与工程振动,2014,34(4):206-211. 曾芳金,朱蓉芬,孙林柱,等.方形混凝土柱在双层箍筋约束下的力学特性研究[J].江西理工大学学报,2013,34(3):23-31. 宋力,丁慧,王建平.双层高强螺旋箍筋约束高强混凝土圆柱轴压受力性能分析[J].水利与建筑工程学报,2015,13(4):141-145. 张耀跃,孙林柱,李昀阳,等.轴向荷载下双层箍筋混凝土柱的力学性能分析[J].建筑结构,2016,46(4):91-96,101.
点击查看大图
计量
- 文章访问数: 51
- HTML全文浏览量: 6
- PDF下载量: 1
- 被引次数: 0