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Mechanical Behavior of Rectangular Concrete-filled Steel Tubular Stub Columns with Encased Profiled Steel Subjected to Axial Load in Life Cycle(PDF)

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

Issue:
2020年03期
Page:
81-90
Research Field:
Publishing date:

Info

Title:
Mechanical Behavior of Rectangular Concrete-filled Steel Tubular Stub Columns with Encased Profiled Steel Subjected to Axial Load in Life Cycle
Author(s):
SHI Yan-li;  ZHANG Wen-xu;  JIA Zhi-lu;  WANG Wen-da
(School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China)
Keywords:
rectangular CFST stub column with encased profiled steel subjected to axial load;  life cycle;  initial stress;  long-term load;  mechanical behavior
PACS:
TU398
DOI:
10.19815/j.jace.2019.05053
Abstract:
In order to study the life cycle force mechanism of rectangular concrete-filled steel tubular(CFST)axial compressive stub columns with encased profiled steel, the finite element software ABAQUS was used to establish the calculation models and the models were compared with the relevant test results. The main influence factors such as initial stress of steel tube and long-term load were considered in the life cycle. The whole process load-deformation curves in life cycle, the longitudinal stress distribution of components in midspan section and the interaction between steel and concrete of rectangular concrete-filled steel tubular axial compressive stub columns with encased profiled steel were analyzed. Furthermore, the influences of initial stress coefficient, long-term load ratio and steel ratio on the bearing capacity and deformation of the component were also investigated. The results show that the ultimate bearing capacity of rectangular CFST axial compressive stub columns with encased profiled steel with the initial stress of steel tube and long-term load does not change significantly compared with the once loading, but the longitudinal strain corresponding to the ultimate bearing capacity increases by 84.2%. During the long-term sustained stage, the core concrete is unloading and the bear capacity of concrete decreases by about 30%, but it continues to bear in the reloading stage. The maximum contact stress between steel tube and concrete appears at the middle section and the contact stress decreases gradually along the length of the member. With the increase of steel ratio of steel tube, the ultimate bearing capacity of the component increases and the deformation decreases, while the steel ratio of profiled steel has little effect on the deformation of the component. Finally, with the increase of the initial stress coefficient and the long-term load ratio, the longitudinal deformation of specimens increases.

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Last Update: 2020-06-08