This paper presents a comparative study of the transmission length (Lt) of pretensioned concrete (PTC) members obtained using experiments and AASHTO, ACI, BIS, Eurocode 2 and fib Model Code (fib-MC) codes. Tests on six PTC specimens (with 12·7 mm dia. strands (ds) and effective prestress (fpe) of 1214 MPa) indicated that Lt can reduce by about 20% when the concrete strength (fci) increases from about 23 to 36 MPa. A case study of the influence of Lt on the shear resistance of a typical precast hollow-core slab showed that the ACI and fib-MC codes provide conservative shear designs, whereas the IS code considers only ds and provides a less conservative design. This paper proposes a revised tentative formula of Lt (as a function of ds, fpe and fci) to be incorporated in the IS 1343 and other codes. It is anticipated that this will lead to more rational and conservative shear designs.
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September 2019
Research Article|
May 29 2018
Transmission length of pretensioned concrete systems – comparison of codes and test data
Prabha Mohandoss;
Prabha Mohandoss
Graduate student, Department of Civil Engineering, Indian Institute of Technology Madras, Chennai, India
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Radhakrishna G. Pillai;
Radhakrishna G. Pillai
Associate Professor, Department of Civil Engineering, Indian Institute of Technology Madras, Chennai, India (corresponding author: pillai@iitm.ac.in)
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Amlan K. Sengupta
Amlan K. Sengupta
Professor, Department of Civil Engineering, Indian Institute of Technology Madras, Chennai, India
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Publisher: Emerald Publishing
Received:
December 15 2017
Revision Received:
April 20 2018
Accepted:
April 27 2018
Online ISSN: 1751-763X
Print ISSN: 0024-9831
ICE Publishing: All rights reserved
2018
Magazine of Concrete Research (2019) 71 (17): 881–893.
Article history
Received:
December 15 2017
Revision Received:
April 20 2018
Accepted:
April 27 2018
Citation
Mohandoss P, Pillai RG, Sengupta AK (2019), "Transmission length of pretensioned concrete systems – comparison of codes and test data". Magazine of Concrete Research, Vol. 71 No. 17 pp. 881–893, doi: https://doi.org/10.1680/jmacr.17.00553
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