5-7 December 2018 - Hong Kong, China

CONFERENCE PAPERS

Ninth International Conference on Advances in Steel Structures (ICASS 2018)


POST-BUCKLING BEHAVIOUR OF CONCRETE-FILLED CIRCULAR STEEL TUBE STUB COLUMNS UNDER AXIAL COMPRESSION

 

Chang Yang1, Zhixiang Yu1,2,3*, Shichun Zhao1, Yuping  Sun1,3,4 , Hua Zhao5 and Hu Xu1

1 School of Civil Engineering, Southwest Jiaotong University, Chengdu, China

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2 National Engineering Laboratory for prevention and control of geological disasters in land transportation, Chengdu, China

3 China-Japan Resilient and Sustainable Concrete Structure Research Center, Chengdu, China

4 Department of Architecture, Graduate School of Engineering, Kobe University, Kobe, Japan

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5 State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, China

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DOI:10.18057/ICASS2018.P.148

ABSTRACT:

Based on 151 experimental data sets from available tests, the post-buckling behaviour of concrete-filled circular steel tube stub columns (CFSTs) in compression is comprehensively analysed to confirm the composite responses, such as failure mode and residual bearing capacity. The development characteristics with initial mechanical parameters of CFSTs are discussed in detail, and a procedure for deriving the reasonable upper limit of residual capacity is proposed by using the superposition method, based on interaction of steel tubes and concrete core in the post-buckling stage, as validated by comparison with the test results from the literature. The mechanical behavior of steel tube in CFSTs is confirmed to be consistent with the circular hollow section steel tube stub columns (CHSs) in compression according to the experimental data. Based on the maximum utilization of material strength and the confinement relationship between steel tubes and concrete core, a higher extreme compressive strength of concrete core may be obtained in the axial strain of 0.04, unless the effective confinement from the tubes is hardly exerted, resulting in the severe damage of the concrete core before stress redistribution in the post-buckling stage.

Keywords:

Post-buckling behaviour; Residual capacity; Ultimate capacity of concrete core; Concrete-filled steel tube; Axial compression

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IMPORTANT DATES

First call for paper:
1 January 2018
Abstract submission: (CLOSED)
1 April 2018
Notification of abstract acceptance:
on or before 16 April 2018 
Full paper submission: 
15 July 2018
Online Registration Begins:
1 August 2018
Notification of full paper acceptance:
31 August 2018
Early bird registration:
on or before 7 September 2018
Online Registration Closes:
31 October 2018
Announcement of programme:
1 November 2018
ICASS2018 December 05, 2018 08:00 AM