摘要
为了解决有限元研究中预制混凝土框架节点处新旧混凝土叠合层界面黏结与穿过叠合层钢筋难以模拟的问题,讨论了有限元软件ABAQUS中模拟新旧混凝土叠合层黏结性能的不同方法,引入叠合层的黏结滑移本构和钢筋的剪切-滑移模型相结合的本构关系,建立后张预应力预制混凝土框架中节点非线性有限元分析模型,计算结果与足尺模型的试验结果吻合较好,并在此基础上重点开展了轴压比、混凝土强度、预应力筋有效应力及筋黏结构造(全黏结、部分黏结和无黏结)等有限元参数分析.分析结果表明:轴压比由0.2增加到0.4时,承载力提高了11%,由0.4增加到0.6时,承载力增加不明显;提高混凝土强度、增加有效预应力可显著提高承载力;预应力筋黏结构造对节点承载力影响不显著,增加无黏结长度,可一定程度延缓节点的屈服.
In order to solve the problem that bond-slip of new and old concrete interfaces and treatment of shear reinforcement bars are challenges for finite element analysis of precast concrete frame joints,different methods in ABAQUS available for simulating the behavior of new and old concrete interfaces were deeply discussed.A new constitutive relation which combines bond-slip between new and old concrete interfaces with shear-slip model of shear reinforcement bar was introduced,and nonlinear finite element models(FEM)were carried out.The calculated results were agreed well with the experimental results of full-scale model test.And then an analysis of parameters was performed,which focused on influences of axial compression ratio,concrete strength,effective stress of prestressed tendon and bonded construction of prestressed tendons(full bond,partial bond and unbonded).The results show that bearing capacity increases by 11%with axial compression ratio increases from 0.2 to 0.4.However,the bearing capacity does not increase significantly when the axial pressure ratio increases from 0.4 to 0.6.Bearing capacity increases with the increasing of concrete strength and effective stress of prestressed tendons.Three types of bonding construction of the prestressed tendons have no obvious influence on the bearing capacity of the connections,but increasing the unbonded length of prestressed tendons may delay the connections yield.
作者
廖显东
胡翔
张士前
刘亚男
薛伟辰
LIAO Xiandong;HU Xiang;ZHANG Shiqian;LIU Yanan;XUE Weichen(China Construction Eighth Engineering Division Co.Ltd.,Shanghai 200122,China;College of Civil Engineering,Tongji University,Shanghai 200092,China;Shanghai Key Laboratory of Engineering Structure Safety,Shanghai Institute of Building Science,Shanghai 200032,China)
出处
《西南交通大学学报》
EI
CSCD
北大核心
2020年第6期1287-1296,共10页
Journal of Southwest Jiaotong University
基金
国家重点研发计划(2016YFC0701608)
中国建筑股份有限公司课题(CSCEC-2015-Z-11)
上海市工程结构安全重点实验室开放课题(2014-KF06)。
关键词
预制
预应力
框架节点
新旧混凝土叠合层
黏结滑移
有限元参数分析
precast
prestressed
frame interior connection
new and old concrete interfaces
bondslip
parameters analysis of finite element models
