|Table of Contents|

Numerical simulation of punching shear resistance of corroded reinforced concrete slab-column joints(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2023年04期
Page:
87-96
Research Field:
建筑结构
Publishing date:

Info

Title:
Numerical simulation of punching shear resistance of corroded reinforced concrete slab-column joints
Author(s):
SHI Lei1;  ZHANG Renbo2;  WANG Zhongmou2;  JIN Liu2;  DU Xiuli2
(1. China Building Technique Group Co., Ltd., Beijing 100013, China; 2. Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China)
Keywords:
steel reinforcement corrosion;  slab-column joint;  punching shear failure;  numerical simulation
PACS:
TU528
DOI:
10.19815/j.jace.2021.12098
Abstract:
A three-dimensional mesoscale numerical model was established to investigate the punching shear resistance of corroded reinforced concrete(RC)slab-column joints, taking into account the inhomogeneity inside the concrete and the influence of steel corrosion. In the model, concrete was considered as a three-phase composite material composed of aggregates, mortar, and the interface transition zone between the two. The impact of corrosion was considered from three aspects, including the decrease in mechanical properties of steel reinforcement, the cracking and degradation of protective layer concrete, and the decrease in bond strength between steel reinforcement and concrete. On the basis of verifying the rationality of the model, the punching failure behavior of corroded RC slab-column joints was simulated, the failure mechanism was analyzed, and the effects of boundary conditions, punching span ratio, and corrosion rate were explored. The results show that the three-dimensional mesoscale model can effectively simulate the punching shear behavior of corroded slab-column joints. The punching shear bearing capacity and peak displacement of fixed supported slab-column joints of the same size are higher than those of simply supported ones, while the stiffness is closed. As the corrosion rate increases, the tensile range of the steel mesh at the bottom of the plate increases, and the damage to the plate becomes more severe. The decrease in bearing capacity of the fixed and simply supported plate column joints slows down, the stiffness sharply decreases, the peak displacement increases, and the influence of boundary conditions weakens. The plastic deformation ability of the fixed support specimen is less affected by the corrosion rate. The higher the impact span ratio, the lower the stiffness and bearing capacity of the joint, the greater the peak displacement, and the faster the load decreases after failure. The corrosion of steel reinforcement has a smaller impact on the bearing capacity, stiffness, and peak displacement of joints with a higher impact span ratio.

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Last Update: 2023-07-01