摘要
为了研究超高性能混凝土(ultra-high performance concrete, UHPC)-窄幅钢箱组合梁负弯矩下的受力性能,设计了1根普通混凝土-窄幅钢箱组合梁和4根UHPC-窄幅钢箱组合梁试件,并进行了反向加载试验,以分析翼板材料、配筋率、UHPC钢纤维掺量对组合梁受力性能的影响。结果表明:随着钢纤维掺量的增加,试件的裂缝数量不断减少,裂缝呈现短而细的特征,组合梁的抗裂性能得到了不同程度的提高;配筋率显著影响结构的刚度以及极限荷载,随着配筋率从1%增加到2%,试件的刚度增强了43.1%,极限荷载提高了11.1%;开裂前弹性阶段UHPC水泥基体的刚度大约是普通混凝土的1.5倍。最后,基于UHPC-窄幅钢箱组合梁结构形式,提出了UHPC-窄幅钢箱组合梁开裂荷载及屈服荷载的计算方法。
In order to study the mechanical behavior of UHPC-narrow steel box composite beam under negative bending moment,one normal concrete-narrow steel box composite beam and four UHPC-narrow steel box composite beam specimens were designed and reverse loading tests were conducted on the test beams to analyze the effects of flange material,reinforcement rate,and the steel fiber content of UHPC on the mechanical behavior of the composite beam.The results show that with the increase of steel fiber content,the number of cracks in the specimens keeps decreasing,the cracks show short and fine characteristics,and the crack resistance of the composite beam is improved to different degrees.The reinforcement rate can significantly affect the structural stiffness and ultimate load,with the increase of reinforcement rate from 1%to 2%,the stiffness of the specimens is increased by 43.1%and the ultimate load by 11.1%.At the elastic stage before cracking,the stiffness of UHPC is about 1.5 times higher than normal concrete.Finally,based on the structural form of UHPC-narrow steel box combination beam,the calculation methods of cracking load and yield load of UHPC-narrow steel box combination beam are proposed.
作者
黄荆
莫时旭
郑艳
刘晓贝
HUANG Jing;MO Shixu;ZHENG Yan;LIU Xiaobei(College of Civil and Architecture Engineering,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of New Energy and Building Energy Saving,Guilin 541004,China)
出处
《广西大学学报（自然科学版）》
CAS
北大核心
2023年第3期506-518,共13页
Journal of Guangxi University（Natural Science Edition）
基金
国家自然科学基金项目(52068012)
广西自然科学基金项目(2021GXNSFAA220101)。
关键词
组合梁
超高性能混凝土
负弯矩
开裂荷载
承载力
composite beam
ultra-high performance concrete
negative bending moment
cracking load
bearing capacity
