Improvements of IS 1343-2012 Shear Design Provisions Using a New Traditional Shear Database of Prestressed Concrete Memb
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Sådhanå (2020) 45:214 https://doi.org/10.1007/s12046-020-01448-5
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Improvements of IS 1343-2012 Shear Design Provisions Using a New Traditional Shear Database of Prestressed Concrete Members with Stirrups MALLIKARJUN PERUMALLA
and ARGHADEEP LASKAR*
Department of Civil Engineering, Indian Institute of Technology Bombay, Bombay, India e-mail: [email protected]; [email protected] MS received 6 January 2020; revised 18 June 2020; accepted 30 June 2020 Abstract. Various national codes of practice play a crucial role in the development of the country’s infrastructure and should be developed based on principles of mechanics and experimental verification. Continuous monitoring of infrastructure and updating of relevant codes of practice at regular intervals is essential to withstand the ever-increasing demand of the country’s infrastructure. In the present study, the shear design provisions of prestressed concrete (PC) in IS 1343-2012 have been reviewed. The assumptions used in the formulations of the existing shear design equations in IS 1343-2012 have been discussed. The present study reveals that the IS 1343-2012 shear design provisions, which are based on old test data, are too conservative and are unable to distinguish the two major modes of traditional shear failure, namely web-shear and flexure-shear. Modifications for the existing IS 1343-2012 shear design equations have been proposed to improve the shear strength estimation of PC members and also to distinguish between the web-shear and flexure-shear failure modes. A detailed comparison of existing IS 1343-2012 shear design provisions with the proposed modified shear strength equations has also been made with the help of a traditional shear database on PC members with stirrups. Keywords. Shear Design; Ultimate Shear Capacity; IS 1343-2012; Shear Database; Web-Shear; FlexureShear; Prestressed Concrete.
1. Introduction The usage of prestressed concrete (PC) structures has been increased enormously due to the rapid development of huge infrastructures in developing nations. The problem of shear design of PC members is still an intriguing problem to several researchers since there is no universally accepted rational theory on the shear behaviour of concrete structures. The first code provision on PC members was introduced in the Indian Standards in 1963 [1]. The second revision for IS 1343 has been published in 1980 with significant changes in the existing design guidelines. The latest IS 1343-2012 [2] shear design provisions are identical to the ones introduced in the 1980 version [3]. Tandavamoorthy and Paramesvaran [4] have investigated the inconsistency of IS 1343-1980 [3] code provisions in estimating the moment capacity of flexural members at limit state of collapse and proposed a new table to calculate the Electronic supplementary material The online version of this article (https://doi.org/10.1007/s12046-020-01448-5) contains supplementary material, which is available to authorized users.
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