|Table of Contents|

Steel tube coal gangue concrete axial pressure short column ultimate bearing capacity calculation method research(PDF)

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

Issue:
2023年03期
Page:
50-60
Research Field:
建筑结构
Publishing date:

Info

Title:
Steel tube coal gangue concrete axial pressure short column ultimate bearing capacity calculation method research
Author(s):
ZHANG Yuzhuo1; 2;  LIU Jinlong3;  XU Qian2;  WANG Qinghe4
(1. School of Management, Shenyang Jianzhu University, Shenyang 110168, Liaoning, China; 2. Liaoning Key Laboratory of Coal Gangue Resource Utilization and Energy-saving Building Materials, Liaoning Technical University, Fuxin 123000, Liaoning, China; 3. School of Civil Engineering, Southeast University, Nanjing 211189, Jiangsu, China; 4. Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, Harbin 150090, Heilongjiang, China)
Keywords:
steel tube concrete column;  coal gangue concrete;  axial compression;  ultimate bearing capacity;  calculation method
PACS:
TU398.1
DOI:
10.19815/j.jace.2021.11148
Abstract:
In order to promote coal gangue application in concrete-filled steel tubular(CFST)structures, coal gangue produced in Liaoning province was selected as coarse aggregate, then the axial compression tests on 6 CFST short columns and 12 CFST short columns using spontaneous-combustion coal gangue aggregate(SCGA)were carried out. Based on the failure mode and load-strain curve of the component, the influences of material strength, steel tube confinement and replacement rate of SCGA on the axial compression bearing capacity of the component were discussed. The correlation analysis between design parameters and axial compression capacity was carried out. On this basis, the applicability of the ultimate bearing capacity calculation method of axial compression short column in GB 50936—2014 and T/CECS 625—2019 to coal gangue CFST was discussed, and the recommended correction coefficient of the calculation formula of ultimate bearing capacity of circular coal gangue CFST short column was given. The results show that the components under axial compression test show local buckling and shear failure modes. Compared with ordinary CFST short column, steel tube has better lateral restraint effect on core coal gangue concrete. Under the same replacement rate, increasing the confinement coefficient and steel ratio will significantly increase the bearing capacity of the component. The axial compression bearing capacity of the component decreases with the increase of the coal gangue replacement rate, but the maximum reduction does not exceed 11%. The correlation coefficient of coal gangue coarse aggregate to bearing capacity is -0.33 which is not significant, The relevant calculation methods in the existing specifications GB 50936—2014 and T/CECS 625—2019 are applicable to the short column of coal gangue CFST. The average error of bearing capacity calculation is less than 3%.

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Last Update: 2023-05-20