CFRP预应力筋超高性能混凝土T梁的受弯性能  

Flexural Behaviors of Ultra High Performance Concrete T Beams Prestressed with CFRP Tendons

作　　者：杨剑[1] 方志[2] 

机构地区：[1]中南大学土木建筑学院,湖南长沙410075 [2]湖南大学土木工程学院,湖南长沙410082

出　　处：《铁道学报》2009年第2期94-103,共10页Journal of the China Railway Society

基　　金：国家自然科学基金资助项目(50478502)

摘　　要：超高性能混凝土（UHPC）和碳纤维（CFRP）以其优异的性能成为土木工程领域极具应用前景的新型建筑材料，将两者结合在一起有望形成一种新的具有优良物理力学性能的配筋混凝土结构型式而应用于实际工程。为此，对超高性能混凝土的单轴受压应力-应变全曲线和UHPC梁的受力性能进行试验研究以及理论分析。试验参数主要选取预应力度、张拉控制应力和CFRP筋的黏结方式。试验结果表明，UHPC具有良好的受压变形性能，基于单轴受压试验结果建立UHPC的受压应力-应变全曲线方程；UHPC梁具有良好的变形能力以及合理的裂缝分布，其极限变形可达到梁跨径的1／30-1／72，在此基础上提出的计算方法能对所研究梁的受力性能进行较好的模拟。Ultra High Performance Concrete （UHPC） and Carbon Fiber Reinforced Polymers （CFRP）, being of excellent properties, have been made types of new construction materials of good application prospects in the civil engineering field. In this paper, an experimental program is formulated to investigate the characteristics of the complete stress-strain curve of UHPC in uniaxial compression and flexural behaviors of UHPC beams. The main test parameters are the prestressing ratio, stretch-draw stress and bond pattern between CFRP tendons and UHPC . The results show that UHPC is of good deformability, the complete stress-strain curve equation for compressed UHPC is established and the UHPC beams have excellent behavior in load carrying capacity, crack distribution and deformability and have their ultimate deflection reaching 1/30-1/72 of the span. Based on the above investigation, theoretical correlation with the predicted structure response of UHPC beams are proposed.

关 键 词：碳纤维(CFRP) 超高性能混凝土(UHPC) 预应力 梁 

分 类 号：TU377[建筑科学—结构工程]