FRP筋增强UHPC模壳型混凝土组合梁受弯性能  

Flexural performance of UHPC formwork-concrete composite beams reinforced with FRP bars

作　　者：严卫华 张瑞 王仪[1] 付世虎 邱林锋 ASHRAF Ashour 葛文杰[1] YAN Weihua;ZHANG Rui;WANG Yi;FU Shihu;QIU Linfeng;ASHOUR Ashraf;Ge Wenjie(College of Civil Science and Engineering,Yangzhou University,Yangzhou 225127,China;Infrastructure Department,Yangzhou University,Yangzhou 225127,China;Yangzhou Jianwei Construction Engineering Testing Center Co.,Ltd,Yangzhou 225009,China;Nantong Construction Quality and Supervision Station,Nantong 226000,China;Faculty of Engineering and Informatics,University of Bradford,Bradford BD71DP,UK)

机构地区：[1]扬州大学建筑科学与工程学院,江苏扬州225127 [2]扬州大学基建处,江苏扬州225127 [3]扬州市建伟建设工程检测中心有限公司,江苏扬州225009 [4]南通市建设工程质量监督站,江苏南通226000 [5]布拉德福德大学工程与信息学院,英国布拉德福德BD71DP

出　　处：《扬州大学学报（自然科学版）》2024年第3期20-28,共9页Journal of Yangzhou University：Natural Science Edition

基　　金：科技部“高端外国专家引进计划”资助项目(G2022014054L);江苏省建设系统科技项目(2023ZD104,2023ZD105);扬州市—扬州大学科技合作专项基金资助项目(YZ2022194,YZU212105);扬州市住建局建设科技计划资助项目(202309,202312).

摘　　要：为研究纤维复合材料(fiber-reinforced polymer,FRP)筋增强超高性能混凝土(ultra-high performance concrete,UHPC)模壳型混凝土组合梁的受弯性能,基于已验证模型,对U型UHPC模壳型混凝土组合梁进行有限元模拟,分析不同配筋率下截面构造形式和UHPC厚度、混凝土和筋材力学性能对构件的开裂、屈服、极限荷载,及其对应挠度、破坏模式、能量耗散和延性等的影响.研究表明:UHPC模壳可有效延缓组合梁开裂;增加UHPC面个数可有效提高极限荷载;适当提高UHPC强度、FRP筋弹性模量和UHPC厚度均可以有效提高极限荷载;混合配筋组合梁比钢筋组合梁有更好的能耗和延性;盲目提高FRP筋抗拉强度并不能提高组合梁受弯性能,但混合配筋模式下,提高FRP配筋率可以提高极限荷载和极限挠度.该研究结果可为UHPC模壳型混凝土组合梁结构设计与分析提供参考.To investigate the flexural performance of ultra-high-performance concrete(UHPC)-normal strength concrete(NSC)composite beams reinforced with fiber-reinforced polymer(FRP)bars,this paper presents a refined finite element(FE)analysis of U-shaped UHPCformwork-concretecomposite beams based on the validated model.The effects of UHPCthickness,mechanical property of concrete and reinforcement section structure on the cracking,yield,ultimate load and corresponding deflection,failure mode,energy dissipation,and ductility of the members under different reinforcement ratios are analyzed.The FE results highlight that the incorporationof UHPCformwork effectively retards the cracking of composite beams.Augmenting the quantity of layers on the UHPCsurface proves to significantly elevate the ultimate load.Properly reinforcing UHPC strength,elastic modulus of FRP bars,and the thickness of UHPC all effectively enhance the ultimate load.Hybrid-reinforced beams exhibit superior energy dissipation and ductility compared to their steel-reinforced counterparts.It s crucial to note that blindly increasing the tensile strength of FRP reinforcement does not achieve an enhancement of bending performance of composite beams.For hybrid reinforced composite beams,improving the FRP reinforcement ratio increasesboth the ultimate load and ultimate deflection.This study can be taken as reference for structural design and analysis of UHPC formwork-concretecomposite beams.

关 键 词：FRP筋 UHPC模壳 组合梁 受弯性能 参数分析 

分 类 号：TU398.9[建筑科学—结构工程]