体外预应力FRP筋加固混凝土单向板抗裂及刚度计算方法  

Anti-cracking ability and stiffness calculation of reinforced concrete one-way slabs externally prestressed with unbonded FRP tendons

作　　者：高丹盈[1] 房栋[1] 祝玉斌[1] 

机构地区：[1]郑州大学新型建材与结构研究中心,河南郑州450002

出　　处：《土木工程学报》2015年第3期34-41,共8页China Civil Engineering Journal

基　　金：国家自然科学基金(59978046)

摘　　要：通过6块体外预应力玻璃纤维增强复合材料(GFRP)筋加固混凝土单向板的受弯试验,分析GFRP筋张拉应力和配筋率对混凝土单向板抗裂性能和挠度的影响。结果表明,随GFRP筋张拉应力和配筋率的增大,体外预应力GFRP筋混凝土单向板抗裂荷载提高25%~125%,跨中开裂挠度增加35%~159%,跨中屈服挠度增加21%~36%,跨中极限挠度降低13%~34%。结合本文体外预应力GFRP筋加固混凝土单向板和已有文献的体外预应力FRP筋混凝土梁试验结果,提出适合体外预应力FRP筋加固混凝土单向板和梁抗裂及刚度的计算方法。Through the flexural tests of six reinforced concrete( RC) one-way slabs externally prestressed with GFRP tendons,the effect of glass fiber reinforced polymer( GFRP) tendons' prestress and reinforcement ratio on anti-cracking ability and deflection of RC one-way slabs was analyzed. According to the test results,the cracking loads,the cracking deflections and the yielding deflections increased by a factor of 25% to 125%,35% to 159% and 21% to 36%respectively and the ultimate deflections decreased 13% to 34% with the increase of prestress and reinforcement ratio of GFRP tendons. Combining the test results in this paper with the results available in the literature,the calculation method of anti-cracking ability and stiffness available for both RC one-way slabs and beams externally prestressed with unbonded FRP tendons is proposed.

关 键 词：结构加固 刚度 受弯试验 FRP筋 单向板 体外预应力 

分 类 号：TU37[建筑科学—结构工程]