冷弯薄壁型钢与轻骨料混凝土黏结性能研究  

Study on bond behavior of cold-formed thin-walled steel and lightweight aggregate concrete

作　　者：牛建刚[1] 王敬淞 边钰 李京军[1] NIU Jiangang;WANG Jingsong;BIAN Yu;LI Jingjun(College of Civil Engineering,Inner Mongolia University of Science and Technology,014010 Baotou,China)

机构地区：[1]内蒙古科技大学土木工程学院,包头014010

出　　处：《应用力学学报》2023年第5期1117-1124,共8页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金资助项目(No.51368042,51968008)。

摘　　要：为研究冷弯薄壁型钢与轻骨料混凝土间的界面黏结性能和磷酸镁水泥(MPC)作为界面黏结剂的可行性,为今后组合结构中增强界面黏结强度的研究提供参考。通过8组试件的推出试验,对其破坏现象、荷载-滑移曲线、界面黏结能量指标及界面损伤进行分析。结果表明:试件的开裂荷载、峰值荷载和残余承载力均会随纤维的掺入而增加;黏结界面涂抹MPC后,黏结承载力会进一步提高,荷载-滑移曲线对应的屈服平台变得更明显。MPC的应用对试件黏结能量指标的提高幅度要大于纤维的作用,其中对弹性变形能的提高幅度更为明显,使试件达到破坏状态的速度大幅延缓,并对加载全程的损伤发展都起到抑制作用,将其应用在LC30级轻骨料混凝土和钢纤维轻骨料混凝土中会取得更好的效果。In order to investigate the interfacial bond behavior between cold-formed thin-walled steel and fiber reinforced lightweight aggregate concrete and the feasibility of using magnesium phosphate cement(MPC)as interfacial binder,it provides a reference for the future research on enhancing the interfacial bonding strength of composite structure.Through the push-out tests of 8 groups of specimens,the failure phenomenon,load-slip curve,interfacial bond energy index and interfacial damage were analyzed.The test results show that the cracking load,peak load and residual bearing capacity of the specimen will increase with the addition of fiber;after the bond interface is smeared with MPC,the bond bearing capacity will be further increased,and the yield platform corresponding to the load-slip curve becomes more obvious.The application of MPC has a greater effect on the bond energy index of the specimen than that of fiber,in which the increase of elastic deformation energy is more obvious,which greatly delays the speed of the specimen reaching the failure state,and restrains the damage development of the whole loading process.The application of MPC in LC30 lightweight aggregate concrete and steel fiber lightweight aggregate concrete will achieve better results.

关 键 词：冷弯薄壁型钢 轻骨料混凝土 界面黏结性能 磷酸镁水泥 界面损伤 

分 类 号：TU398[建筑科学—结构工程]