|Table of Contents|

Analysis on Mechanical Behavior of Tapered Concrete-filled Double Steel Tubular Short Columns Under Axial Compression(PDF)

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

Issue:
2019年03期
Page:
37-45
Research Field:
Publishing date:

Info

Title:
Analysis on Mechanical Behavior of Tapered Concrete-filled Double Steel Tubular Short Columns Under Axial Compression
Author(s):
WANG Wen-da;  ZHANG Chao-feng;  WANG Jing-xuan;  ZHENG Long
(School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China)
Keywords:
tapered concrete-filled double steel tube;  axial compression;  hollow section ratio;  load-displacement curve;  mechanical behavior
PACS:
TU398
DOI:
-
Abstract:
In order to study the mechanical behavior of tapered concrete-filled double steel tubular(CFDST)short columns under axial compression, the mechanical model was established by the ABAQUS software, and the results were compared with the existing experimental data to verify the rationality of the model. The load-displacement curve, interaction stress between steel tubes and concrete, failure modes and load distribution of typical member were investigated respectively. The hollow ratio, tapered angle, ratio of diameter and thickness of steel tube and concrete strength to the influence of interaction stress between steel tubes and concrete were also analyzed. The result indicates that the load-displacement curve of tapered CFDST short column is divided into elastic stage, elastic-plastic stage, descending stage and maintenance stage.The failure of the member is caused by the outward bending of the outer steel tube, and the fracture cross section is at the height of 0.8H(H is the height of member). The changes of tapered angle and hollow section ratio have a great influence on the position of failure cross section, with the increase of tapered angle and hollow section ratio, the position of failure cross section is closer to the top of the column. The main factors affect the interaction stress between outer steel tube and concrete are hollow section ratio, tapered angle, ratio of diameter and thickness of outer steel tube, outer steel tube yield strength and concrete strength. The main factors affect the compressive stress between inner steel tube and concrete are hollow section ratio, tapered angle and outer steel tube yield strength. The ratio of diameter and thickness of inner steel tube and yield strength of inner steel tube have little effect on the compressive stress between steel tubes and concrete, and may not be analyzed as the main parameter.

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Last Update: 2019-05-23