钢-混组合梁中钢与混凝土的强度匹配试验研究  

Experimental Study on Strength Matching Between Steel and Concrete of Composite Beams

作　　者：卢志芳 符润朝[1,2] 刘沐宇 冯鹏程[3] 刘新华[3] LU Zhi-fang;FU Run-chao;LIU Mu-yu;FENG Peng-cheng;LIU Xin-hua(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China;Hubei Key Laboratory of Roadway Bridge&.Structure Engineering,Wuhan University of Technology,Wuhan 430070,China;CCCC Second Highway Consultants Co Ltd,Wuhan 430056,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]武汉理工大学道路桥梁与结构工程湖北省重点实验室,武汉430070 [3]中交第二公路勘察设计研究院有限公司,武汉430056

出　　处：《武汉理工大学学报》2024年第12期62-68,共7页Journal of Wuhan University of Technology

基　　金：国家重点研发计划(2022***3102601);湖北省重点研发计划(2020BCB065,2020BAB081)。

摘　　要：基于普通混凝土C60、超高性能混凝土180 MPa级UHPC、普通钢Q370、Q420和高强钢Q500等5种材料,设计制备了6根不同强度钢材与不同强度混凝土的组合梁,开展其抗弯性能试验,研究不同强度匹配的钢-混组合梁的抗弯力学性能、破坏形态和裂缝分布特征,掌握钢-混组合梁钢与混凝土强度的匹配规律。结果表明:随着钢主梁强度从Q370、Q420到Q500,当混凝土为C60时组合梁的抗弯极限承载力分别为645 kN、673 kN和762 kN,延性系数分别为2.96、2.62、2.11;当混凝土为180 MPa级UHPC时,其抗弯极限承载力分别为700 kN、784 kN和979 kN,延性系数分别为3.26、3.35、3.60,表明钢主梁强度的提高,对组合梁的抗弯极限承载力起主要作用;当UHPC和Q500组合匹配时,组合梁的抗弯极限承载力最高、延性系数最大,表明该组合具有优异的性能,不仅发挥了UHPC的优势,也发挥了高强钢的作用。Based on five materials, namely ordinary concrete C60,ultra-high performance concrete 180 MPa grade UHPC,ordinary steel Q370,Q420 and high-strength steel Q500,this paper designed and prepared 6 composite beams with different strengths of steel and concrete, carried out flexural performance tests, studied the flexural mechanical properties, failure modes and crack distribution characteristics of steel-concrete composite beams with different strength matching, and mastered the matching law of steel and concrete strength in steel-concrete composite beams.The results show that as the strength of the steel main beam increases from Q370,Q420 to Q500,when the concrete is C60,the ultimate bending bearing capacity of the composite beam is 645 kN,673 kN and 762 kN,and the ductility coefficient is 2.96,2.62 and 2.11 respectively.When the concrete is 180 MPa grade UHPC,the ultimate bending bearing capacity is 700 kN,784 kN and 979 kN,and the ductility coefficient is 3.26,3.35 and 3.60 respectively, indicating that the improvement of the strength of the steel main beam plays a major role in the ultimate bending bearing capacity of the composite beam.When UHPC and Q500 are combined and matched, the ultimate bending bearing capacity of the composite beam is the highest and the ductility coefficient is the largest, indicating that the combination has excellent performance, not only giving play to the advantages of UHPC,but also giving play to the role of high-strength steel.

关 键 词：高强钢 超高性能混凝土 强度匹配 抗弯极限承载力 延性系数 

分 类 号：TU398.9[建筑科学—结构工程]