Transmission length of pretensioned concrete systems – comparison of codes and test data-Reference-Cited by-同舟云学术

Transmission length of pretensioned concrete systems – comparison of codes and test data

Published:2019-09 Issue:17 Volume:71 Page:881-893
ISSN:0024-9831
Container-title:Magazine of Concrete Research
language:en
Short-container-title:Magazine of Concrete Research

Author:

Mohandoss Prabha¹,Pillai Radhakrishna G.²,Sengupta Amlan K.³

Affiliation:

1. Graduate student, Department of Civil Engineering, Indian Institute of Technology Madras, Chennai, India

2. Associate Professor, Department of Civil Engineering, Indian Institute of Technology Madras, Chennai, India (corresponding author: )

3. Professor, Department of Civil Engineering, Indian Institute of Technology Madras, Chennai, India

Abstract

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.

Publisher

Thomas Telford Ltd.

Subject

General Materials Science,Building and Construction,Civil and Structural Engineering

Link

https://www.icevirtuallibrary.com/doi/pdf/10.1680/jmacr.17.00553

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