梁端局部无粘结钢筋混凝土梁抗震性能数值模拟分析  

Seismic behavior and numerical simulation of partially unbonded RC cantilever beams at beam ends

作　　者：杨成苗 何相宇 李萍 商子轩 盛飞翔 YANG Chengmiao;HE Xiangyu;LI Ping;SHANG Zixuan;SHENG Feixiang(China Architecture Design Group,Beijing100044,China;China Building Technique Group Co.,Ltd.,Beijing100013,China;Beijing Urban Construction Investment Development Co.,Ltd.,Beijing100010,China)

机构地区：[1]中国建筑设计研究院有限公司,北京100044 [2]中国建筑技术集团有限公司,北京100013 [3]北京城建投资发展股份有限公司,北京100010

出　　处：《建筑结构》2021年第S01期761-764,共4页Building Structure

摘　　要：为了研究梁端局部无粘结钢筋混凝土悬臂梁抗震性能及影响因素,基于梁端局部无粘结梁在低周往复荷载作用下的破坏性试验,进行抗震性能分析,并利用ABAQUS开放平台,建立了有限元分析模型。通过有限元模拟,分析了无粘结段长度、混凝土强度、配筋率对梁端局部无粘结梁的抗震性能影响。结果表明ABAQUS的模拟结果与试验得出的骨架曲线及最终的破坏状态吻合较好。且通过ABAQUS模拟结果表明无粘结段的长度对局部无粘结悬臂梁的抗震承载力影响不是特别明显;随着混凝土强度等级的增加,局部无粘结梁的刚度增加较为显著;随着配筋率的增大,局部无粘结梁的承载力特征值增大越明显,且配筋率的提升有利于提高无粘结梁的延性。In order to study the seismic performance and influencing factors of partially unbonded RC cantilever beams,based on the destructive test of unbonded beams under low cyclic loading,the seismic performance analysis was carried out,and the finite element analysis model was established using ABAQUS open platform.Through finite element simulation,the influence of unbonded segment length,concrete strength and reinforcement ratio on seismic behavior of beams with local unbonded ends is analyzed.The results show that the simulation results of ABAQUS are in good agreement with the skeleton curve and the final failure state.The results of ABAQUS simulation show that the length of the unbonded section has no obvious effect on the seismic capacity of the local unbonded cantilever beam;with the increase of concrete strength grade,the stiffness of the local unbonded cantilever beam increases significantly;with the increase of reinforcement ratio,the characteristic value of bearing capacity of local unbonded beam increases more obviously,and the increase of reinforcement ratio is conducive to improve the ductility of unbonded beam.

关 键 词：钢筋混凝土悬臂梁 局部无粘结 抗震性能 

分 类 号：TU375.1[建筑科学—结构工程] TU352.11