超高强钢筋混凝土梁在静态加载下的抗弯性能试验  

Experimental Study on Bending Performance of Ultra-high Strength Reinforced Concrete Beams under Static Loading

作　　者：张丛琨 张仲昊 汪维 李磊 何翔 ZHANG Congkun;ZHANG Zhonghao;WANG Wei;LI Lei;HE Xiang(Key Laboratory of Impact and Safety Engineering of Ministry of Education,Ningbo University,Ningbo 315211,Zhejiang,China;Institute of Defense Engineering,Academy of Military Science,Luoyang 471023,Henan,China;Henan Key Laboratory of Special Protective Materials,Luoyang 471023,Henan,China)

机构地区：[1]宁波大学冲击与安全工程教育部重点实验室,浙江宁波315211 [2]军事科学院国防工程研究院,河南洛阳471023 [3]河南省特种防护材料重点实验室,河南洛阳471023

出　　处：《兵工学报》2023年第S01期107-116,共10页Acta Armamentarii

基　　金：国家自然科学基金项目(11302261、11972201);河南省科技创新人才计划资助项目(154200510028)。

摘　　要：为研究配置超高强钢筋混凝土梁的抗弯性能,设计制作11组不同钢筋强度、混凝土强度、配筋率的钢筋混凝土梁,采用四点弯曲静力加载的方式,对试件的破坏形态、弯曲响应、屈服荷载、极限承载力及裂缝宽度等进行试验研究。结果表明,加强钢筋的强度可以提高钢筋混凝土梁的最大承载能力;增加混凝土强度对梁的抗弯承载能力影响相对较小;增加纵向钢筋配筋率能够明显提高钢筋混凝土梁的抗弯承载能力;HTRB600/700超高强钢筋混凝土梁在受力形态、弯曲响应和破坏模式方面与普通钢筋混凝土梁相同,其屈服荷载和极限承载力仍然可以按照相关规范公式进行计算;对于受弯梁构件,HTRB600级钢筋的抗拉强度设计值建议取520 MPa,HTRB700级钢筋的抗拉强度设计值建议取610 MPa;在短期荷载作用下超高强钢筋混凝土梁试件实测的最大裂缝宽度值比相关规范计算值大,因此提出了一个最大裂缝宽度调整系数k并进行了计算公式的修正,经过调整后得到的计算值与试验实测值吻合度较高。11 sets of reinforced concrete beams with different steel bar strength,concrete strength,and reinforcement ratios are designed and manufactured to study the bending performance of ultra-high strength reinforced concrete beam.The failure morphology,bending response,yield load,ultimate bearing capacity,and crack width of specimen are experimentally studied using a four-point static loading method.The results indicate that the maximum bearing capacity of reinforced concrete beam can be improved by strengthening the strength of steel bars,the increase in the strength of concrete has a relatively small impact on the flextural bearing capacity of beam,and the increase in the longitudinal reinforcement ratio can significantly improve the flextural bearing capacity of reinforced concrete beams.The HTRB600/700 ultra-high strength reinforced concrete beam is the same as ordinary reinforced concrete beam in terms of stress morphology,bending response,and failure mode.Its yield load and ultimate bearing capacity can still be calculated usung relevant code formulas.For bending beam components,the recommended design value for tensile strength of HTRB600 steel bars is 520 MPa,and the recommended design value for tensile strength of HTRB700 steel bars is 610 MPa;The measured maximum crack width of ultra-high strength reinforced concrete beam specimen under short-term load is greater than the calculated value in relevant specifications.Therefore,the adjustment coefficient k of a maximum crack width is proposed and the calculation formula is modified.After adjustment,the calculated value obtained is in good agreement with the experimentally measured value.

关 键 词：超高强钢筋 混凝土梁 弯曲响应 受弯性能 极限承载力 最大裂缝宽度 

分 类 号：O342[理学—固体力学]