|Table of Contents|

Experiment and Numerical Simulation on Bond-slip Behavior Between Angle Steel and Concrete(PDF)

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

Issue:
2020年06期
Page:
81-90
Research Field:
Publishing date:

Info

Title:
Experiment and Numerical Simulation on Bond-slip Behavior Between Angle Steel and Concrete
Author(s):
ZHAO Wei-ping1;  WANG Zhen-xing1;  DONG Peng-kun1;  ZHU Bin-rong2;  CHEN Hui-ling1
1. School of Mechanics and Civil Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China; 2. China Electric Power Research Institute, Beijing 100192, China.
Keywords:
angle steel concrete;  ultimate bond strength;  numerical simulation;  bond mechanism;  transfer length
PACS:
TU375
DOI:
-
Abstract:
In order to study the interface bond behavior between angle steel and concrete, 9 angle steel concrete specimens were designed with the bond length, protective layer depth and concrete strength as parameters. The load-slip curves at the loaded end were obtained, and the influence of each parameter on the ultimate bond strength was analyzed. The calculation formula for the bond strength of interface was proposed, and compared with the test results, they agreed well with each other. Based on the interface Coulomb friction law and restart analysis technology, a refined finite element model was established to precisely simulate the gradual peeling process of the bond interface. Based on the research parameters, a calculation formula of transfer length was proposed, and compared with numerical simulations, which proved the applicability of the formula.The results show that the tip of the angle steel has a strong cracking effect, and the development of cracks during the pushing process will significantly reduce the bond strength. The ultimate bond strength increases with the increasing of concrete strength and protective layer depth, however decreases approximately linearly with the increasing of bond length. The load-slip curves of loaded end include chemical adhesion section, ascending section, descending section and residual section, and the interface bond mechanism and composition of bond stress are different at each stage. The damage of the bond interface gradually expands from loaded end to free end, and the transfer length of the bond stress remains constant during the propagation.

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