|Table of Contents|

Influence of double bar spacing on anchorage performance of concrete planting bar beams(PDF)

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

Issue:
2023年05期
Page:
89-98
Research Field:
建筑结构
Publishing date:

Info

Title:
Influence of double bar spacing on anchorage performance of concrete planting bar beams
Author(s):
YAN Xikang1; 2;  JIA Yunfei1;  LIANG Linxiao3;  DIAO Ranzhi1;  WANG Shida1;  XIE Hanlin1
(1. School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China; 2. Hebei Civil Engineering Technology Research Center, Hebei University of Technology, Tianjin 300401, China; 3. Architectural Engineering Institute, North China Institute of Aerospace Engineering, Langfang 065000, Hebei, China)
Keywords:
concrete planting bar beam;  reinforcement;  planting bar spacing;  anchorage performance
PACS:
TU375.1
DOI:
10.19815/j.jace.2021.12002
Abstract:
In order to study the effect of the anchorage spacing of double planting bars on the anchorage performance of bent planting bar beams, bending loading tests were conducted on double planting bar beams with a spacing of 2d(d is the diameter of planting bar)between planting bars. Based on the results of the single planting bar pull-out test, the differences between the double planting bar component and the single planting bar were compared. On the basis of experiments, the differences in mechanical properties of reinforced beams with different spacing of planting bars were analyzed using ABAQUS finite element software. The boundary spacing between the double bars of the reinforced concrete beam was found through the average bond stress of the planting bars and the equivalent plastic strain nephogram of the concrete. A basic anchoring depth calculation formula related to the spacing coefficient of planting bars was proposed based on the relationship between bonding stress under different spacing of planting bars. The results show that due to the impact of stress overlap between two planting bars in concrete, when the spacing between planting bars is small, it can lead to insufficient stress development and weaken the anchoring performance of planting bars. As the spacing between planting bars increases, the stress overlap between the two planting bars weakens. When the spacing between planting bars is greater than 6d, the impact of overlapping stress of planting bars can be ignored. Therefore, it is recommended that the spacing between planting bars for beam bending components in engineering should be greater than 6d. In response to the problem that the spacing between planting bars cannot be designed to be more than 6d due to the size limitations of the original components in practical engineering, it is recommended to increase the anchorage depth appropriately.

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Last Update: 2023-09-01