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Axial Compression Performance of RCFST Middle Long Columns(PDF)

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

Issue:
2020年03期
Page:
18-27
Research Field:
Publishing date:

Info

Title:
Axial Compression Performance of RCFST Middle Long Columns
Author(s):
REN Zhi-gang;  ZHANG Ming;  WEI Wei;  WANG Dan-dan
(School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, Hubei, China)
Keywords:
RCFST;  axial compression performance;  bounds slenderness ratio;  bearing capacity;  middle long column
PACS:
TU398
DOI:
10.19815/j.jace.2019.05054
Abstract:
In order to study the axial compression performance of the round-ended concrete-filled steel tube(RCFST)middle long columns, a finite element model of RCFST middle long columns under axial load was developed by using ABAQUS. On the basis of verifying the rationality and accuracy of the finite element model by the existing experimental data, the deformation and the bearing capacity states of the specimens were analyzed, and the properties of short columns, middle long columns and long columns were compared, the boundary slenderness ratio of RCFST was proposed. A simplified formula for calculating ultimate bearing capacity of RCFST middle long columns was presented based on the analysis of the parameters such as the slenderness radio, thickness of the steel pipe, concrete strength, steel strength and height to width aspect ratio, and the accuracy of simplified formula was verified. The results show that the short column is strength failure, the middle long column is buckling failure and the long column is elastic instability failure. Under the same conditions, the slenderness ratio has negative relation as well the steel strength and thickness of steel pipes have positive relation with the ultimate bearing capacity and ductility of RCFST middle long column under axial load, but the variation of concrete strength has less influence on ultimate bearing capacity and ductility. The bounds slenderness ratio among stub columns, middle long columns and long columns are λ0=10-11 and λp=86.4-96.0 respectively; the formula for calculating axial load bearing capacity has sufficient accuracy comparing with the results of finite element analysis and experiment, and it can provide theoretical basis for the research and engineering application of RCFST middle long columns.

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Last Update: 2020-06-08