|Table of Contents|

Analysis on Axial Compression Mechanical Behavior of Circular Concrete Filled Steel Tubular Stub Columns with Inner Crossed Profiled Steel Under Construction Pre-load(PDF)

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

Issue:
2020年01期
Page:
85-93
Research Field:
Publishing date:

Info

Title:
Analysis on Axial Compression Mechanical Behavior of Circular Concrete Filled Steel Tubular Stub Columns with Inner Crossed Profiled Steel Under Construction Pre-load
Author(s):
DUAN Shao-zhen;  MA Yu;  SHI Yan-li;  WANG Wen-da
(School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China)
Keywords:
circular concrete filled steel tube;  inner crossed profiled steel;  construction pre-load;  axial compression member;  mechanical behavior
PACS:
TU398
DOI:
10.19815/j.jace.2019.01034
Abstract:
Using ABAQUS finite element software, the numerical models of concrete filled steel tubular(CFST)stub columns with inner crossed profiled steel under axial pressure were established, which considered the construction pre-load of outer steel tube and the pre-load of steel tube and section steel construction respectively. And the modeling method was verified. The whole process load-displacement curves and the bearing capacity distribution curves of CFST with inner profiled steel considering construction pre-load were calculated respectively. The stress development state and the contact stresses between concrete and outer tube, concrete and inner crossed profiled steel were analyzed respectively. Finally, the parameters of pre-load coefficient, component slenderness ratio, steel content of tube and profiled steel, yield strength of tube and profiled steel, and compressive strength of concrete were analyzed. The results show that the influence law of the construction pre-load of outer tube on the mechanical properties of axial compression member in CFST with inner profiled steel is the same as that on the common CFST. At the same time of the pre-loads of the outer steel tube and the profile steel, the interaction time of the concrete and the outer tube and the profile steel is delayed, and the sleeve of steel tube on concrete and the local restraint of concrete on profiled steel pipe are weakened, so that the composite member enters the elastoplastic stage in advance and expands the range of the next stage. The ultimate bearing capacity of composite columns decreases with the increase of the pre-load value. The slenderness ratio has a significant effect on the bearing capacity of the axial compression column.

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Last Update: 2020-01-13