基于动态黏结滑移性能的钢筋混凝土分离式模型研究  

Reinforced concrete separation model based on dynamic bond-slip performances

作　　者：刘智 赵兰浩[2] 吴晓彬[1] 周永门[1] 王姣[1] LIU Zhi;ZHAO Lanhao;WU Xiaobin;ZHOU Yongmen;WANG Jiao(Jiangxi Provincial Institute of Water Sciences,Nanchang 330029,China;College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]江西省水利科学研究院,南昌330029 [2]河海大学水利水电学院,南京210098

出　　处：《振动与冲击》2021年第2期1-8,48,共9页Journal of Vibration and Shock

基　　金：国家重点研发计划(2016YFC0401601,2018YFC0406705);江西省水利厅科技计划项目(202022YBKT04)。

摘　　要：基于钢筋混凝土黏结滑移机理,搭建能够描述循环荷载作用下钢筋混凝土之间黏结性能变化过程的动态黏结-滑移本构关系,并结合单弹簧联结单元法建立钢筋混凝土分离式模型。模型避免了人为选择法向刚度困难的问题,并通过局部坐标系求解钢筋单元解决工程配筋布置问题,保证了复杂受力条件下的计算精度与计算效率。结合混凝土损伤模型进行经典算例分析,展示了模型对于结构中钢筋与混凝土局部变形与作用力关系的模拟,并对比分析了地震荷载作用下Koyna重力坝表层配筋对大坝整体动力响应及最终破坏模式的影响。研究表明,当坝体表层易损区域布置抗震钢筋之后,在钢筋与混凝土的协同作用下能够起到一定程度的限裂作用,提高坝体的抗震性能。算例的仿真结果均能够反映工程界的普遍认知,同时也验证了该模型的正确性。Based on the bond-slip mechanism of reinforced concrete,a dynamic bond-slip constitutive relation capable of describing the change of the bond behavior of steel bars and concrete under cyclic load was established,and a single-spring joint element method was used to establish a separation model of reinforced concrete.The model overcomes the difficulty to choose the normal stiffness coefficients,and solves the problem of the arrangement of steel bars by means of solving the steel bar elements in local coordinate system,which ensures the calculation accuracy and efficiency under complex stress conditions.In addition,a classic example analysis was performed by combined use of the concrete damage model.The model was used to simulate the relationship between the local deformation and forces of the steel bar and concrete in the structure.Furthermore,the effects of surface reinforcement of the Koyna gravity dam on the overall dynamic response and ultimate failure mode of the dam under the action of seismic load were compared and analyzed.The result shows that when seismic reinforcement is arranged in the vulnerable area of the surface of the dam,it can play a certain role in limiting cracking and improve the seismic performance of the dam.The simulation results of the examples can reflect the general cognition of the engineering community,and also verify the validity of the model.

关 键 词：钢筋混凝土 黏结滑移 单弹簧联结单元 分离式模型 动力分析 

分 类 号：TV312[水利工程—水工结构工程] TV314