|Table of Contents|

Effect of Initial Imperfection on Post-buckling Strength of Concrete-filled Rectangular Steel Tubular Column Slab(PDF)

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

Issue:
2020年05期
Page:
161-169
Research Field:
Publishing date:

Info

Title:
Effect of Initial Imperfection on Post-buckling Strength of Concrete-filled Rectangular Steel Tubular Column Slab
Author(s):
LU Xun1;  LIU Yong-jian1; 2;  SUN Li-peng1;  JIANG Lei1; 2
1. School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China; 2. Research Center of Highway Large Structure Engineering on Safety of Ministry of Education, Chang’an University, Xi’an 710064, Shaanxi, China
Keywords:
concrete-filled steel tube;  welding residual stress;  initial geometric imperfection;  post-buckling strength
PACS:
TU312
DOI:
10.19815/j.jace.2020.09044
Abstract:
In order to study the influence of welding residual stress and initial geometric imperfection on the post-buckling strength of concrete-filled rectangular steel tubular column slab, the finite element software ABAQUS was used to analyze the parameters, including the yield strength of slab, the ratio of width to thickness, the size of initial geometric imperfection, the application of initial geometric imperfection and welding residual stress, and the coupling effect of the two was considered. Finally, the formula of effective width of concrete-filled rectangular steel tubular column slab considering welding residual stress and initial geometric imperfection was given and compared with the experimental data. The results show that the finite element model established can better simulate the local buckling and post-buckling behavior of the slab, welding residual stress and initial geometric imperfection will reduce the post-buckling strength of the slab, and the influence of welding residual stress is greater. The effects of welding residual stress and initial geometric imperfection need to be considered for steels with different strength grades. For high strength steels with yield strength greater than 460 MPa, the influence of initial geometric imperfection can be ignored when the ratio of width to thickness is greater than 65. The effective width formula can accurately and conservatively predict the post-buckling strength of concrete-filled rectangular steel tubular column slab.

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Last Update: 2020-10-15