无粘结部分预应力纤维聚合物筋混凝土梁试验  

Behavioral Research of Concrete Beam Prestressed with Unbonded CFRP Tendon

作　　者：程东辉[1] 郑文忠[2] 

机构地区：[1]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090 [2]东北林业大学土木工程学院,黑龙江哈尔滨150040

出　　处：《沈阳建筑大学学报（自然科学版）》2008年第4期537-542,共6页Journal of Shenyang Jianzhu University：Natural Science

基　　金：教育部新世纪优秀人才支持计划项目(教育司[2005]290号);哈尔滨市重点科技攻关项目(2005AACG009)

摘　　要：目的研究无粘结CFRP筋部分预应力混凝土受弯构件的受力性能,荷载作用下CFRP筋应力增量、受弯构件变形以及裂缝分布特征.方法设计制作4根简支试验梁,梁中以CFRP筋作无粘结预应力筋、普通钢筋作非预应力筋,对试验梁在两点进行分级加载,根据各梁试验结果对这类梁的受力性能展开研究.结果试验梁的裂缝分布比较均匀,且主要集中在纯弯曲段;混凝土的开裂对梁的变形及CFRP筋应力增量影响不大,而非预应力钢筋屈服后,试验梁变形及CFRP筋应力增量明显增大,且CFRP筋极限应力增量受综合配筋指标影响显著;提出了以综合配筋指标为自变量的无粘结CFRP筋极限应力增量计算公式.结论无粘结CFRP筋部分预应力混凝土受弯构件有良好的力学性能,试验结果为开展这类梁的设计研究提供了理论依据.To study stress increment of CFRP tendons, deflection of members and distribution of cracks in concrete beams partially prestressed with unbonded CFRP tendon, four test simple beams were designed and fabricated. In the beams, CFRP tendons were taken as unbonded prestressed tendon, reinforcement were taken as unprestressed tendon. Loaded on two points. Study was carried out based on test data. The following conclusion was obtained： cracks were centered on bended region, increment stress of CFRP tendon was little influenced after concrete crazed. But when unprestressed tendon yielded, deflection of beam and increment stress in CFRP tendon increased obviously, and increment stress of CFRP tendon was influenced by the global reinforcement index. At the same time the computation formula of increment stress at limit state in CFRP tendon were put forward. So we can infer that concrete beam partially prestressed with unbonded CFRP tendon possess good mechanical property, and the test conclusion provides theory foundation for designing and study in these beams.

关 键 词：无粘结部分预应力 CFRP筋 应力增量 挠度 裂缝 

分 类 号：TU398.2[建筑科学—结构工程]