Tests of carbon fibre–reinforced polymer strengthened cold-formed stainless steel tubular sections subjected to web crippling

Abstract

A total of 67 web crippling tests were conducted on carbon fibre–reinforced polymer strengthened cold-formed stainless steel square and rectangular hollow sections in this article. Several carbon fibre–reinforced polymer strengthening schemes were adopted, such as strengthened with carbon fibre–reinforced polymer sheets, strengthened with carbon fibre–reinforced polymer plates and strengthened with anchored carbon fibre–reinforced polymer plates. Two loading conditions of end-two-flange and interior-two-flange have been considered. The tests were performed on five different tubular section sizes which covered a slightly wide range of measured web slenderness ratios from 18.70 to 68.41. The effects of carbon fibre–reinforced polymer length, number of carbon fibre–reinforced polymer layers and carbon fibre–reinforced polymer strengthening schemes on the strength enhancement have been discussed based on the test results obtained from this study. It was found that the web crippling capacity of stainless steel tubular sections can be obviously increased by carbon fibre–reinforced polymer strengthening, especially for those sections with large values of web slenderness under end-two-flange loading condition. However, the strengthening enhancement of carbon fibre–reinforced polymer sheets and carbon fibre–reinforced polymer plates is quite limited due to the debonding between stainless steel tube and carbon fibre–reinforced polymer. The anchored carbon fibre–reinforced polymer plates can effectively delay or totally prevent the debonding failure. The web crippling behaviour of cold-formed stainless steel square and rectangular hollow sections strengthened with anchored carbon fibre–reinforced polymer plates has been significantly improved. Finally, the web crippling test results obtained from this study are compared with the current design strengths.

Keywords

anchor carbon fibre–reinforced polymer carbon fibre–reinforced polymer strengthening cold-formed stainless steel tubular section web crippling

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References

American Society for Testing and Materials (ASTM) (1997) Standard Test Methods for Tension Testing of Metallic Materials (E 8M-97). West Conshohocken, PA: ASTM.

American Society of Civil Engineers (ASCE) (2002a) Commentary on Specification for the Design of Cold-Formed Stainless Steel Structural Members (SEI/ASCE-8-02). Reston, VA: ASCE.

American Society of Civil Engineers (ASCE) (2002b) Specification for the Design of Cold-Formed Stainless Steel Structural Members (SEI/ASCE-8-02). Reston, VA: ASCE.

American Society of Civil Engineers (ASCE) (2005) Minimum Design Loads for Buildings and Other Structures (ASCE standard 7-05). New York: ASCE Standard.

EC3 (2006) Eurocode 3: Design of Steel Structures – Part 1.4: General Rules – Supplementary Rules for Stainless Steels (BS EN 1993-1-4). Brussels: CEN.

Fawzia

(2007) Bond characteristics between steel and carbon fibre reinforced polymer (CFRP) composites. PhD Thesis, Monash University, Melbourne, VIC, Australia.

Fawzia

Karim

(2009) Investigation into the bond between CFRP and steel plates. Proceedings of World Academy of Science, Engineering and Technology 53: 321–325.

Fernando

(2010) Bond behaviour and debonding failures in CFRP-strengthened steel members. PhD Thesis, Hong Kong Polytechnic University, Hong Kong.

Fernando

Teng

. (2009) CFRP strengthening of rectangular steel tubes subjected to end bearing loads: effect of adhesive properties and finite element modelling. Thin-Walled Structures 47(10): 1020–1028.

10.

Islam

SMZ

(2012) Strengthening of aluminum and stainless steel tubular sections with fibre-reinforced polymer. PhD Thesis, The University of Hong Kong, Hong Kong.

11.

Islam

SMZ

Young

(2011) FRP strengthened aluminium tubular sections subjected to web crippling. Thin-Walled Structures 49(11): 1392–1403.

12.

Islam

SMZ

Young

(2012a) Ferritic stainless steel tubular members strengthened with high modulus CFRP plate subjected to web crippling. Journal of Constructional Steel Research 77: 107–118.

13.

Islam

SMZ

Young

(2012b) Web crippling of aluminium tubular structural members strengthened by CFRP. Thin-Walled Structures 59: 58–69.

14.

Islam

SMZ

Young

(2013) Strengthening of ferritic stainless steel tubular structural members using FRP subjected to Two-Flange-Loading. Thin-Walled Structures 62: 179–190.

15.

Korvink

Van den Berg

Van der Merwe

(1995) Web crippling of stainless steel cold-formed beams. Journal of Constructional Steel Research 34(2): 225–248.

16.

Zhao

Duan

(2011) Design rules for web crippling of CFRP strengthened aluminium rectangular hollow sections. Thin-Walled Structures 49(10): 1195–1207.

17.

Zhao

Al-Mahaidi

(2009) Web buckling of lightsteel beams strengthened with CFRP subjected to end-bearing forces. Thin-Walled Structures 47(10): 1029–1036.

18.

Zhao

Fernando

Al-Mahaidi

(2006) CFRP strengthened RHS subjected to transverse end bearing force. Engineering Structures 28(11): 1555–1565.

19.

Zhou

Young

(2006) Cold-formed stainless steel sections subjected to web crippling. Journal of Structural Engineering: ASCE 132(1): 134–144.

20.

Zhou

Young

(2007a) Cold-formed high-strength stainless steel tubular sections subjected to web crippling. Journal of Structural Engineering: ASCE 133(3): 368–377.

21.

Zhou

Young

(2007b) Experimental and numerical investigations of cold-formed stainless steel tubular sections subjected to concentrated bearing load. Journal of Constructional Steel Research 63(11): 1452–1466.