Maximum concrete stress developed in unconfined flexural RC members

Ho, J.C.M., Pam, H.J., Peng, J. and Wong, Y.L. (2011) Maximum concrete stress developed in unconfined flexural RC members. Computers and Concrete, 8 2: 207-227.

Author Ho, J.C.M.
Pam, H.J.
Peng, J.
Wong, Y.L.
Title Maximum concrete stress developed in unconfined flexural RC members
Journal name Computers and Concrete   Check publisher's open access policy
ISSN 1598-8198
Publication date 2011
Year available 2011
Sub-type Article (original research)
Open Access Status
Volume 8
Issue 2
Start page 207
End page 227
Total pages 21
Place of publication Korea, Republic of
Publisher Techno-Press
Collection year 2011
Language eng
Formatted abstract
In flexural strength design of unconfined reinforced concrete (RC) members, the concrete compressive stress-strain curve is scaled down from the uni-axial stress-strain curve such that the maximum concrete stress adopted in design is less than the uni-axial strength to account for the strain gradient effect. It has been found that the use of this smaller maximum concrete stress will underestimate the flexural strength of unconfined RC members although the safety factors for materials are taken as unity. Herein, in order to investigate the effect of strain gradient on the maximum concrete stress that can be developed in unconfined flexural RC members, several pairs of plain concrete (PC) and RC inverted T-shaped specimens were fabricated and tested under concentric and eccentric loads. From the test results, the maximum concrete stress developed in the eccentric specimens under strain gradient is determined by the modified concrete stress-strain curve obtained from the counterpart concentric specimens based on axial load and moment equilibriums. Based on that, a pair of equivalent rectangular concrete stress block parameters for the purpose of flexural strength design of unconfined RC members is determined.
Keyword Rectangular stress block parameters
Reinforced concrete
Strain gradient
Uni axial concrete stress
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Civil Engineering Publications
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Created: Thu, 23 Oct 2014, 17:48:05 EST by Johnny Ho on behalf of School of Civil Engineering