BFRP筋碱激发海砂混凝土梁抗弯性能研究  

Bending Performance of BFRP Bars Alkali-Activated Sea Sand Concrete Beams

作　　者：范小春[1,2] 崔祺 张澳 王文琦 FAN Xiaochun;CUI Qi;ZHANG Ao;WANG Wenqi(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China;Sanya Science and Education Innovation Park,Wuhan University of Technology,Sanya 572000,China;Benchmark Fangzhong Architectural Design Co.,Ltd.,Wuhan 430070,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,武汉430070 [2]武汉理工大学三亚科教创新园,三亚572000 [3]基准方中建筑设计股份有限公司,武汉430070

出　　处：《硅酸盐通报》2023年第12期4242-4253,共12页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(41972271);武汉理工大学三亚科教园开放基金(2021KF0001);海洋建筑智能建造技术研发(ZDKJ2021024)。

摘　　要：本文提出了一种玄武岩筋碱激发海砂混凝土(BASC)梁的新型材料结构构件。为了研究BASC梁抗弯性能,制作了5根混凝土梁,研究了玄武岩筋(BFRP)配筋率和不同筋材类型对碱激发海砂混凝土(ASC)梁抗弯性能和破坏模式的影响。试验结果表明:BASC梁配筋率的提升对开裂荷载影响不大,但却能有效提高其极限荷载。以0.27%配筋率为参照组,当配筋率提高至0.48%、0.75%、1.08%时,BASC梁的极限承载力分别提高了109.46%、119.60%和189.66%。与普通钢筋相比,BFRP筋弹性模量较小,配筋率相同的情况下,普通钢筋ASC梁的开裂荷载比BASC梁大50%。本文提出了正截面抗弯承载力、最大裂缝宽度和挠度的理论计算模型,由于受到ASC中氯离子扩散的影响,需要对计算模型进行修正,拟合后BASC梁的计算值与试验值吻合较好,可为BASC梁在海洋工程中的应用提供参考。In this paper,a new type of material structural member of basalt bar alkali-activated sea sand concrete(BASC)beam was proposed.In order to study the bending performance of BASC beams,five concrete beams were fabricated.The effects of basalt fiber reinforced polymer(BFRP)reinforcement ratio and different reinforcement types on the bending performance and failure modes of alkali-activated sea sand concrete(ASC)beams were studied.The test results show that the increase of the reinforcement ratio of BASC beams has little effect on the cracking load,but it can effectively improve its ultimate load.Taking the reinforcement ratio of 0.27%as the reference group,when the reinforcement ratio increases to 0.48%,0.75%and 1.08%,the ultimate bearing capacity of BASC beams increases by 109.46%,119.60%and 189.66%,respectively.Compared with ordinary steel bars,the elastic modulus of BFRP bars is smaller.With the same reinforcement ratio,the cracking load of ordinary steel bar ASC beams is 50%,larger than that of BASC beams.The theoretical calculation models of bending capacity,maximum crack width and deflection of normal section are proposed.Due to the influence of chloride ion diffusion in ASC,the calculation model needs to be modified.The calculated values of BASC beams after fitting are in good agreement with the experimental values,which can provide reference for the application of BASC beams in ocean engineering.

关 键 词：BFRP筋 碱激发海砂混凝土 抗弯性能 正截面承载力计算 破坏形态 海洋工程 

分 类 号：TU528[建筑科学—建筑技术科学]