CFRP-钢复合筋珊瑚海砂海水混凝土梁正截面受弯承载力及设计方法  

Flexural capacity and design method for cross-section of coral sea-sand aggregate seawater concrete beams reinforced with CFRP-steel composite bars

作　　者：周济 陈宗平[2,3] 周志飞 劳国威 马志鑫 李柏均 ZHOU Ji;CHEN Zongping;ZHOU Zhifei;LAO Guowei;MA Zhixin;LI Bojun(College of Civil Engineering,Nanjing Forestry University,Nanjing 210037,China;School of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;School of Architecture and Civil Engineering,Nanning University,Nanning 530200,China)

机构地区：[1]南京林业大学土木工程学院,江苏南京210037 [2]广西大学土木建筑工程学院,广西南宁530004 [3]南宁学院土木与建筑工程学院,广西南宁530200

出　　处：《建筑结构学报》2025年第1期173-188,共16页Journal of Building Structures

基　　金：国家自然科学基金项目(51578163);广西重点研发计划项目(桂科AB21220012);中央引导地方科技发展资金项目(桂科ZY21195010)。

摘　　要：结合CFRP-钢复合筋珊瑚海砂海水混凝土梁的受力特点,建立了此类梁的截面应力状态分析模型,推导了正截面开裂弯矩、屈服弯矩和极限弯矩的计算公式。为验证公式的正确性,开展了20根CFRP-钢复合筋珊瑚海砂海水混凝土梁和1根CFRP-钢复合筋普通混凝土梁的受弯性能试验。试验结果表明:结合不同破坏模式下梁的截面应力状态分析,所推导的正截面特征点弯矩计算公式的计算值与试验值相对误差小于15%。采用建议的计算公式对相关研究中FRP-钢复合筋混凝土梁的极限弯矩进行验算,极限弯矩计算公式可较为准确地评估梁的受弯承载力。同时,所建立的截面刚度和裂缝宽度计算公式适用于计算CFRP-钢复合筋珊瑚海砂海水混凝土梁的变形和最大裂缝宽度。基于承载力、变形和裂缝宽度计算公式,提出了CFRP-钢复合筋珊瑚海砂海水混凝土梁的正截面设计方法,并通过设计实例给出截面设计和截面校核的计算过程,可为此类梁的设计应用提供参考。Based on the force transfer characteristics of coral sea-sand aggregate seawater concrete beams reinforced with CFRP-steel composite bars, a sectional stress distribution analysis model for such beams was established, and the calculation formulas for cracking moment, yield moment, and ultimate moment of the cross-section were derived.To validate the formulas, mechanical performance tests were conducted on 20 coral sea-sand aggregate seawater concrete beams reinforced with CFRP-steel composite bars and one ordinary concrete beam reinforced with CFRPsteel composite bars subjected to bending. The test results indicate that, by analyzing the sectional stress state of the beams under different failure modes, the calculated values from the derived formulas for the bending moments at characteristic points of the cross-section show an error of less than 15% compared to the experimental values, demonstrating good agreement. The suggested calculation formulas were then used to verify the ultimate bending moments of concrete beam reinforced with FRP-steel composite bars in related studies, accurately assessing the bending capacity of the beams. Additionally, the established calculation formulas for sectional stiffness and crack width are applicable for calculating the deformation and maximum crack width of coral sea-sand aggregate seawater concrete beams reinforced with CFRP-steel composite bars. Based on the formulas for load-bearing capacity, deformation, and crack width, a design method for the cross-section of coral sea-sand aggregate seawater concrete beams reinforced with CFRP-steel composite bars was proposed. The calculation process for sectional design and verification was provided through design examples, offering a reference for the design application of such beams.

关 键 词：珊瑚海砂海水混凝土梁 CFRP-钢复合筋 正截面承载力 静力试验 设计方法 

分 类 号：TU398[建筑科学—结构工程]