内置CFRP圆管的方钢管高强混凝土受弯构件力学性能的有限元分析  

Finite Element Analysis On High Strength Concrete Filled Square Steel Tubular Beam With Inner CFRP Circular Tube

作　　者：任德斌[1] 裴伟[1] 李帼昌[1] 李欣[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）》2012年第4期670-677,共8页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(50678106)

摘　　要：目的研究配置率和含钢率的变化对内置CFRP圆管的方钢管高强混凝土受弯构件力学性能的影响,为试验研究提供理论基础.方法利用数值分析的方法,采用有限元软件ABAQUS分别对9根内置CFRP圆管的方钢管高强混凝土受弯构件和3根普通方钢管高强混凝土受弯构件进行模拟对比分析.结果保持CFRP配置率不变时,受弯构件的抗弯承载力随含钢率增大而有所提高;当含钢率保持不变时,受弯构件的抗弯承载力随CFRP圆管层数的增加而增大.CFRP圆管有助于提高构件抗弯刚度,内置CFRP圆管后,受弯构件挠度曲线沿构件长度方向呈正弦半波形态.结论受弯构件中钢管与CFRP圆管具有较好的协同工作能力,内置CFRP圆管可以有效地改善方钢管高强混凝土受弯构件的力学性能.In order to study the mechanical properties of high-strength concrete-filled square steel tubular beams with inner CFRP circular tube with finite element method and how CFRP and steel ratio affect it, nine high-strength concrete filled square steel tubular beams with inner CFRP circular tubes and three high- strength concrete filled square steel tubelar beams were analyzed with finite element software Abaqus. The moment-curvature curve and load-the strain curve were drawn by the analysis results. The analysis results show that under the condition of the same number of CFRP layers, the bearing capacity of high-strength con- crete-filled square steel tubular beam improves with increase of steel ratio. Under the condition of the same slenderness ratio, the bearing capacity of high-strength concrete-filled square steel tubular beam improves ob- viously with increase of the number of CFRP layers. Moment-curvature curve of the beam can be divided in- to elastic stage, elastic-plastic stage, softening segment and springback section. CFRP can effectively improve performance of high-strength concrete-filled square steel tubular beams.

关 键 词：有限单元法 受弯构件 CFRP圆管 高强混凝土 抗弯刚度 

分 类 号：TU393[建筑科学—结构工程]