STRENGTH OF INTERMEDIATE LENGTH TUBULAR STEEL COLUMNS – BARE, CONCRETE FILLED, RETROFITTED OR REHABILITATED

Sambu Potty, Narayanan and VALLYUTHAM, Kalaikumar and Cossa, N.J. and Hasifi, M.S. (2010) STRENGTH OF INTERMEDIATE LENGTH TUBULAR STEEL COLUMNS – BARE, CONCRETE FILLED, RETROFITTED OR REHABILITATED. In: WEC 2010, 2-5 August 2010, Kuching. Sarawak.

[thumbnail of WEC-CBIT015.pdf] PDF
WEC-CBIT015.pdf - Published Version
Restricted to Registered users only

Download (218kB) | Request a copy

Abstract

Steel tubular members are used in high rise buildings, industrial structures, piles, bridge piers and offshore
structures. The strength of short length steel tubular – bare or infilled with normal concrete – is widely
reported. The codes provide expressions for evaluating the nominal strength of short and long, bare and infilled
steel columns. Not many studies on intermediate length steel columns are reported. The ongoing research on
concrete infilled steel tubular sections has the following aspects: (1) Steel tubulars of length 1200 mm infilled
with concrete of grades 30, 60 and 80 N/mm2 tested in axial compression and comparison with the code
predicted ultimate strengths using EC4, BS5400, ACI, AS and AIJ. The results show that BS5400 predicted
values were 30% lower than experimental results whereas ACI, AS and AIJ predictions were 5% higher for
concrete 60Mpa and 80 MPa. (2) Rehabilitation of artificially damaged tubulars using concrete, grout and
CFRP sheets. The “artificial damage” simulating typical patch corrosion reduced the ultimate strength by 5-
23%. Concrete filled tubulars when corroded had reduced strength by 40-50%. The several retrofit methods
showed significant increase in strength. However, grout infill showed highest strength gain, followed by
concrete infill. CFRP retrofit showed only limited increase.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: steel tubular, concrete, infill, CFRP, corrosion, retrofit
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Departments / MOR / COE: Departments > Civil Engineering
Depositing User: DR NARAYANAN SAMBU POTTY
Date Deposited: 13 Jan 2011 05:14
Last Modified: 19 Jan 2017 08:23
URI: http://scholars.utp.edu.my/id/eprint/3983

Actions (login required)

View Item
View Item