CFRP环向约束圆钢管混凝土扭转性能试验  

Experimental Study on Torsion Behavior of the Concrete Filled Circular Steel Tube Confined by CFRP Circumferentially

作　　者：王庆利[1] 董羽[1] 孙涛[1] 阎煦[1] 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2009年第2期267-271,共5页Journal of Shenyang Jianzhu University：Natural Science

基　　金：辽宁省教育厅重点实验室项目(20060690);沈阳市科学技术计划项目(1063290-1-003)

摘　　要：目的了解CFRP环向约束圆钢管混凝土的扭转性能,给出其抗扭极限承载力的表达式.方法对4个CFRP环向约束圆钢管混凝土进行了扭转性能试验研究,用当量化法给出其抗扭极限承载力的表达式.结果试件的破坏属于强度破坏;在抗扭极限承载力之前,试件基本符合平截面假定;钢管和CFRP筒可以协同工作.确定了CFRP环向约束圆钢管混凝土的抗扭极限承载力指标,抗扭极限承载力的计算结果与试验结果吻合良好.结论环向CFRP对圆钢管混凝土试件的抗扭极限承载力有一定程度的提高,CFRP环向约束圆钢管混凝土典型的扭矩-转角曲线可分为3个阶段:弹性段、增强段和陡降段.Four concrete filled circular steel tubular specimens confined by CFRP circumferentially were experimentally investigated in this paper to study their torsion behavior. The test results indicate that failure is controlled by the strength loss of the materials. The typical torque-angle curve for the member is proposed and it can be divided into three stages,i, e. , elasticity, softening and sharp descending stage. Analysis of the test results indicates that, before the ultimate torsion carrying capacity, the specimen keeps plane approximately, and the steel tube and its outer CFRP material can cooperate circumferentially. Circumferential CFRP can enhance the ultimate torsion carrying capacity of the specimens to some degree. Finally, the index of the ultimate torsion carrying capacity was defined, and the expression of the ultimate torsion carrying capacity for the concrete filled circular steel tube confined by CFRP circumferentially was given based on the equivalent method and the results calculated agree well with those of the tests.

关 键 词：圆钢管混凝土 CFRP环向约束 扭转性能 抗扭极限承载力 

分 类 号：TU393[建筑科学—结构工程]