|Table of Contents|

Influence mechanism and prediction model of self-stress on axial compression performance of concrete-filled steel tube short column(PDF)

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

Issue:
2023年06期
Page:
58-71
Research Field:
建筑结构
Publishing date:

Info

Title:
Influence mechanism and prediction model of self-stress on axial compression performance of concrete-filled steel tube short column
Author(s):
TENG Xiaodan1; 2; 3; 4;  MENG Chungui1;  MO Jianfeng1;  SUN Huihuang1;  PENG Linxin1; 2; 3
(1. School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, Guangxi, China; 2. Guangxi Key Laboratory of Engineering Disaster Prevention and Structural Safety, Guangxi University, Nanning 530004, Guangxi, China; 3. Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004, Guangxi, China; 4. Guangxi Xinfazhan Communication Group Co., Ltd, Nanning 530028, Guangxi, China)
Keywords:
concrete-filled steel tube;  expansive agent;  self-stress;  short column;  axial compression performance
PACS:
TU398.9
DOI:
10.19815/j.jace.2022.01049
Abstract:
In order to study the influence mechanism of self-stress on the axial compression performance of concrete-filled steel tube(CFST)short column, self-stressing concrete was prepared by using different dosages of expansion agents, and axial compression test of 12 self-stressing CFST short columns were carried out, the influences of self-stress on the failure mode, load-displacement curve, ultimate bearing capacity, failure displacement and load-strain curve of the specimens were analyzed. The self-stressing CFST axial compression short column finite element model(FEM)was established by using the finite element software ABAQUS, and the simulation results agree well with experiment results. The influences of self-stress on ultimate bearing capacity, load distribution between steel tube and concrete, contact stress and so on were further analyzed. The influence mechanism of self-stress on the axial compression performance of short columns was illustrated by the change of contact stress between steel tube and concrete, and longitudinal stress of concrete. Finally, based on the method of statistical analysis, the partial correlation analysis of the factors affecting the self-stress was carried out, and a self-stress prediction model was proposed. The results show that self-stress does not affect the failure form of the specimens, and the influence of self-stress on ultimate bearing capacity has an optimal level in the test, the average ultimate bearing capacity of the 12% expansion agent content group is the highest. The failure displacement corresponding to the specimens reaching the ultimate bearing capacity decreases with the increase of self-stress. The effect of self-stress on load-displacement and load-strain is not significant. Improving the concrete strength, steel tube strength and wall thickness can improve the ultimate bearing capacity of specimens.

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Last Update: 2023-12-01