掺复合镍铁渣混凝土梁柱中节点变形特性  

Deformation characteristics of interior beam-column joints made with composite ferronickel slag concrete

作　　者：陈尚鸿[1,2] 祁皑[1,2] 刘旭宏 黄增楠 林伟[1,2] CHEN Shanghong;QI Ai;LIU Xuhong;HUANG Zengnan;LIN Wei(College of Civil Engineering,Fuzhou University,Fuzhou,Fujian 350108,China;National and Local United Research Center for Seismic and Disaster Informatization of Civil Engineering,Fuzhou University,Fuzhou,Fujian 350108,China)

机构地区：[1]福州大学土木工程学院,福建福州350108 [2]福州大学土木工程防震减灾信息化国家地方联合工程研究中心,福建福州350108

出　　处：《福州大学学报（自然科学版）》2022年第5期709-716,共8页Journal of Fuzhou University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51878181,52278490);福建省科技厅科学技术重大专项(2019HZ07011)。

摘　　要：针对掺复合镍铁渣混凝土与水平钢筋的粘结强度弱于普通混凝土的情况,基于试验研究复合镍铁渣混凝土梁柱中节点的变形特性.节点变形主要归结为附属梁体的弯曲变形和梁纵筋滑移引起的梁柱界面附加转角变形.从试验现象来看,梁体的弯曲变形并不明显,而梁柱界面附加转角变形明显.采用数值方法分析了不同复合镍铁渣掺量下梁柱界面附加转角变形值,研究表明,随着复合镍铁渣掺量的增加,梁柱界面附加转角增加,占整体变形较大比例.为此提出了梁端等效塑性铰模型,确定塑性铰长度与梁长、复合镍铁渣掺量、梁纵筋直径之间的关系,用于评估复合镍铁渣混凝土梁柱中节点的极限变形能力.The bond strength between composite ferronickel slag concrete and horizontal rebar is significantly weaker than that of normal concrete.In view of this characteristic and based on the previous test data,the deformation characteristics of the interior beam-column joints made with composite ferronickel concrete are analyzed theoretically.The joint deformation consists mainly of the bending deformation of the attached beam and the additional angle deformation caused by the longitudinal rebar slip at the beam-column interface.From the observation of the experimental phenomena,the bending deformation of the beam is not obvious,while the additional angle deformation at the beam-column interface is obvious.Using the numerical method verified by the experimental results,the proportion of the additional rotation angle deformation at the beam-column interface to the total deformation was analyzed.Results showed that with the increase of the composite ferronickel slag content,the additional rotation angle at the beam-column interface increases,which accounts for a large proportion of the overall deformation.The equivalent plastic hinge model at beam end was put forward,which can quickly evaluate the ultimate deformation capacity of interior beam-column joints made with composite ferronickel slag concrete.The plastic hinge length was determined as a function of the beam length,the ferronickel slag content,and the beam longitudinal rebar diameter.

关 键 词：复合镍铁渣混凝土 粘结强度 梁柱中节点 纵筋滑移 等效塑性铰模型 

分 类 号：TU375.4[建筑科学—结构工程] TU528