基于动态黏结滑移性能的钢筋混凝土分离式模型研究

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...

Reinforced concrete separation model based on dynamic bond-slip performances

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.