摘要
为了研究超高性能混凝土梁的受弯性能,分析其破坏形态、裂缝、挠度及承载力,探讨配筋率、纵筋种类(GFRP筋和HRB400级钢筋)对超高性能混凝土梁受弯性能的影响,对4根超高性能混凝土简支梁进行受弯试验。结果表明:相同配筋率下,GFRP筋梁的开裂荷载小于HRB400级钢筋梁的,开裂后其裂缝发展速度、刚度退化速度均比HRB400级钢筋梁快,而极限荷载大于HRB400级钢筋梁的;GFRP筋、HRB400级钢筋梁的延性均随配筋率的增大而减小,且GFRP筋梁的延性差于HRB400级钢筋梁的,但GFRP筋梁的断裂韧度大于HRB400级钢筋梁的。对比各国规范对超高性能混凝土梁承载力的计算式,给出计算的适用性建议。
In order to study the flexural performance of ultra-high performance concrete(UHPC) beams, four simple supported UHPC beams were tested.The experimental results in terms of failure characteristics, crack, deflection and bearing capacity were presented and the influences of parameters, including reinforcement ratio and longitudinal rebar type(GFRP bars and HRB400 steel bars), were discussed.Results show that with the same ratio of reinforcement in UHPC beams, the cracking load of GFRP bars beam was less than that of HRB400 steel bars beam, while the ultimate load was greater than that of HRB400 steel bars beam.After cracking, the crack development speed and stiffness degradation speed of GFRP bars beam were faster than those of HRB400 steel bars beam.The ductility of GFRP bars beam and HRB400 steel bars beam decreases with the increase of reinforcement ratio.The ductility of GFRP bars beam was worse than that of HRB400 steel bars beam, while the fracture toughness of GFRP bars beam was greater than that of HRB400 steel bars beam.By comparing the calculation formulas of bearing capacity of UHPC beams in national codes, some suggestions on the applicability of the calculation are given.
作者
曹霞
张维佳
邓小芳
任义成
张猛
CAO Xia;ZHANG Wei-jia;DENG Xiao-fang;REN Yi-cheng;ZHANG Meng(Guangxi Key Laboratory of New Energy and Building Energy Saving,Guilin University of Technology,Guilin 541004,China;Construction Institute,Guangdong Technology College,Zhaoqing 526000,China;Infrastructure Logistics Department,Guilin University of Technology,Guilin 541004,China)
出处
《广西大学学报（自然科学版）》
CAS
北大核心
2022年第6期1446-1458,共13页
Journal of Guangxi University（Natural Science Edition）
基金
国家自然科学基金项目(52168028)
广西建筑新能源与节能重点实验室项目(桂科能22-J-21-14)。
关键词
超高性能混凝土
玻璃纤维筋
钢筋
受弯性能
ultra-high performance concrete
glass fibre-reinforced polymer bar
steel bar
flexural performance
