首页|FRP筋增强UHPC模壳型混凝土组合梁受弯性能

FRP筋增强UHPC模壳型混凝土组合梁受弯性能

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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 perform-ance 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.
Flexural performance of UHPC formwork-concrete composite beams reinforced with FRP bars
To investigate the flexural performance of ultra-high-performance concrete(UHPC)-nor-mal strength concrete(NSC)composite beams reinforced with fiber-reinforced polymer(FRP)bars,a refined finite element(FE)analysis of U-shaped UHPC formwork-concrete composite beams is presented based on the validated model.The effects of UHPC thickness,mechanical prop-erty of concrete and reinforcement section structure on the cracking,yield,ultimate load and corre-sponding deflection,failure mode,energy dissipation,and ductility of the members under different reinforcement ratios are analyzed.The FE results highlight that the incorporation of UHPC form-work effectively retards the cracking of composite beams.Augmenting the quantity of layers on the UHPC surface 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 ulti-mate load.Hybrid-reinforced beams exhibit superior energy dissipation and ductility compared to their steel-reinforced counterparts.It is 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 increases both the ultimate load and ultimate deflection.Reference can be provided for structural design and analysis of UHPC formwork-concrete composite beams.

FRP barUHPC form workcomposite beamflexural performanceparametric analysis

严卫华、张瑞、王仪、付世虎、邱林锋、ASHRAF Ashour、葛文杰

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扬州大学建筑科学与工程学院,江苏扬州 225127

扬州大学基建处,江苏扬州 225127

扬州市建伟建设工程检测中心有限公司,江苏扬州 225009

南通市建设工程质量监督站,江苏南通 226000

布拉德福德大学工程与信息学院,英国布拉德福德BD71DP

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FRP筋 UHPC模壳 组合梁 受弯性能 参数分析

科技部"高端外国专家引进计划"资助项目江苏省建设系统科技项目江苏省建设系统科技项目扬州市—扬州大学科技合作专项基金资助项目扬州市—扬州大学科技合作专项基金资助项目扬州市住建局建设科技计划资助项目扬州市住建局建设科技计划资助项目

G2022014054L2023ZD1042023ZD105YZ2022194YZU212105202309202312

2024

10.19411/j.1007-824x.2024.03.003

扬州大学学报(自然科学版)
扬州大学

扬州大学学报(自然科学版)

影响因子：0.473
ISSN：1007-824X
年,卷(期)：2024.27(3)