|Table of Contents|

Experimental study on torsional crack width of reinforced concrete beams with HPB300 stirrups(PDF)

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

Issue:
2023年06期
Page:
101-110
Research Field:
建筑结构
Publishing date:

Info

Title:
Experimental study on torsional crack width of reinforced concrete beams with HPB300 stirrups
Author(s):
YUE Fengjiang1; 2;  GU Xinghua2;  YUN Fengling3;  ZHAO Wen1; 2;  CUI Liping1; 2
(1. School of Architecture and Engineering, Xinjiang University, Urumqi 830017, Xinjiang, China; 2. Xinjiang Key Laboratory of Building Structure and Earthquake Resistance, Xinjiang University, Urumqi 830017, Xinjiang, China; 3. Shandong Jianye Engineering Technology Co, Ltd., Linyi 276005, Shandong, China)
Keywords:
concrete beam;  pure torsion test;  crack width;  stirrup ratio;  stirrup spacing
PACS:
TU528
DOI:
10.19815/j.jace.2022.01096
Abstract:
The torsional crack width test was carried out on 11 concrete beams(including 10 concrete beams with HPB300 steel stirrups and 1 concrete beam with HRB400 steel stirrups). The influence of the strain of stirrups and longitudinal reinforcement on the crack distribution and crack width of concrete beams under pure torsion was discussed. The correlation between the crack width of rectangular section concrete pure torsion members and the factors such as the ratio of longitudinal reinforcement, the ratio of stirrups and the spacing of stirrups was analyzed. The results show that the crack width of the rectangular section concrete pure torsion member increases linearly proportional to the stirrup strain, which is directly related to the stirrup spacing, longitudinal reinforcement spacing and section aspect ratio. By changing the stirrup spacing and longitudinal reinforcement spacing, the stirrup ratio and reinforcement ratio have a great influence on the width of the torsional crack. The diameter change of stirrup or longitudinal reinforcement has little effect on the crack width of rectangular section concrete pure torsion members. Under the same condition of concrete strength and section aspect ratio, the spacing of torsional cracks is related to the total reinforcement ratio. The larger the total reinforcement ratio, the smaller the crack spacing. In the range of suitable reinforcement, there is no obvious relationship between crack dip angle and reinforcement strength ratio under pure torsion. The concrete pure torsion beam with HPB300 steel stirrups designed by the standard bearing capacity formula cannot naturally meet the limit requirements of the maximum crack width in the normal use stage.

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Last Update: 2023-12-01