摘要
为了研究活性粉末混凝土梁柱节点的抗裂性能,开展24个活性粉末混凝土梁柱节点试件(12个边节点和12个中节点试件)的低周反复荷载试验,研究节点类型、尺寸效应、轴压比、节点核心区配箍率、贯穿节点的梁内腰筋及柱内非角部钢筋等因素对活性粉末混凝土梁柱节点抗裂性能的影响;提出活性粉末混凝土梁柱节点的开裂荷载计算公式。研究结果表明:与中节点试件相比,边节点试件的初裂剪力与极限承载力更接近,为极限承载力的51.8%~70.4%;活性粉末混凝土梁柱节点的开裂荷载存在尺寸效应,随着节点截面面积的增大,节点开裂时的平均剪应力降低;节点核心区的开裂荷载随配箍率和轴压比增大而增大;贯穿节点的柱内非角部钢筋和梁腰筋对初裂剪力影响不明显,但对节点核心区的斜裂缝分布有影响;本文提出的开裂荷载公式计算结果与试验结果较吻合,可为实践工程提供参考。
To investigate the crack resistance of reactive powder concrete(RPC)beam-column joints,twenty-four(twelve exterior and twelve interior)beam-column joint specimens were tested under low-frequency cyclic loading.The influences of variables on crack resistance of reactive powder concrete joints were analyzed,including joint types,size effect,the axial compression ratio,stirrup ratio in joint,web reinforcement and non-corner vertical reinforcement across joint core.A formula for predicting the crack bearing capacity of RPC joints was proposed.The results show that the crack capacity of RPC exterior joint is closer to the ultimate bearing capacity than the interior joint,and the ratio of crack capacity to ultimate capacity is 51.8%.70.4%.There exists size effect in the crack capacity of RPC joint specimens,and the average shear stress decreases with the increase of joint sectional area when cracks appear in joint core.The crack capacity increases with the increase of the stirrup ratio and axial compression ratio in joint.Web reinforcement and non-corner vertical reinforcement across joint core have no obvious influence on crack shear force of joint,but have influence on distribution of diagonal cracks in joint.Results from the proposed formula is in agreement with that of experimental results,which provides reference for actual project.
作者
鞠彦忠
沈浩
王德弘
郑文忠
JU Yanzhong;SHEN Hao;WANG Dehong;ZHENG Wenzhong(School of Civil Engineering and Architecture,Northeast Electric Power University,Jilin 132012,China;Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education,Harbin Institute of Technology,Harbin 150090,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2019年第5期1203-1209,共7页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(51378095)
吉林省科技发展计划项目(20180101064JC)~~
关键词
活性粉末混凝土
梁柱节点
开裂荷载
影响因素
reactive powder concrete
beam-column joints
crack capacity
influence factors
