摘要
为促进复合镍铁渣混凝土在实际工程中的应用,针对复合镍铁渣混凝土与水平受力钢筋之间的黏结力较弱问题,理论分析了掺复合镍铁渣混凝土梁柱中节点(后称“镍渣混凝土中节点”)的受力机理,指出镍渣混凝土中节点承载力不仅以节点受剪、梁端受弯控制,还存在节点核心区内梁贯穿纵筋的黏结失效问题,并推导了相应的节点承载力公式。基于已有的5个镍渣混凝土中节点拟静力试验结果,验证了本研究理论分析的可靠性,指出复合镍铁渣混凝土强度是节点承载力的重要保障,应采用合理的配合比。为防止梁贯穿纵筋在节点核心区内过早发生黏结失效,提出了与复合镍铁渣掺量、混凝土强度、钢筋等级相对应的梁纵筋相对贯穿长度(hc/d)限值。
In order to promote the application of composite ferronickel slag concrete(F-concrete)in practical engineering and in view of the weak bond between F-concrete and horizontal reinforcement,the bearing mechanism of the F-concrete interior beam-column joints was theoretically analyzed.It was pointed out that the bearing capacity of joints is not only controlled by shear of joints and bending of beam ends,but also by bond failure of beam longitudinal rebars passing through the joint core area,and the corresponding formulas for bearing capacity were derived.Based on the existing quasi-static test results of five F-concrete interior beam-column joints,the reliability of the theoretical analysis was partially verified.It was pointed out that the F-concrete strength is an important guarantee for the bearing capacity of joints,and the F-concrete mix proportion should be calculated reasonably.In order to prevent the bond failure of the beam longitudinal reinforcement within the joint area,the limit value of the relative embedment length of beam longitudinal reinforcement(hc/d)related with the content of composite ferronickel slag,concrete strength and reinforcement grade was proposed.
作者
祁皑
刘旭宏
黄增楠
陈尚鸿
颜学渊
QI Ai;LIU Xuhong;HUANG Zengnan;CHEN Shanghong;YAN Xueyuan(School of Civil Engineering,Fuzhou University,Fuzhou 350116,China;School of Civil Engineering,Fujian University of Technology,Fuzhou 350118,China)
出处
《混凝土》
CAS
北大核心
2022年第6期45-50,共6页
Concrete
基金
国家自然科学基金资助项目(51678158)
福建省高校产学合作项目(2016H61010017)
装配式混凝土建筑绿色建造关键技术与产业化示范应用研究(2019HZ07011)。
关键词
复合镍铁渣混凝土
梁柱节点
节点承载力
梁纵筋相对贯穿长度
黏结失效
composite ferronickel slag concrete
beam-column joints
bearing capacity of joints
relative embedment length
bond failure
