Flexural Behaviour of Segmental Composite Skew Slabs with Truss Shear Connector

Dhanush, S and Rao, Balakrishna K (2015) Flexural Behaviour of Segmental Composite Skew Slabs with Truss Shear Connector. International Journal of Scientific Research Engineering & Technology (IJSRET, 4 (3). pp. 239-246. ISSN 2278 – 0882

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Abstract

In the recent times, use of concrete-concrete composite slabs as bridge decks has become a common practice, mainly due to the ease of construction and considerable reduction in use of form work and labour. Most of the recent designs for bridge decks are often skew, skew shape of the slab facilitates a large variety of options for an engineer in terms of alignment opportunities in case of obstructions. Composite action of two concrete members is achieved by the interface shear transfer between the two members, this mechanism is of great significance. The interface shear carrying capacity is dependent on the surface properties and shear connectors provided. In the present study we try to determine the influence of truss shaped shear connectors on the flexural load carrying capacity of slabs having various degrees of skew-ness. Four series of slabs are modelled, each corresponding to a certain degree of skew-ness, each series in turn is sub-classified into sub-series based on the number of shear connectors, and their layout. Results show that the load carrying capacity of the slab decreases as the angle of skew-ness increases, and the load carrying capacity of all slabs increases as the number of shear connectors in the longitudinal direction increases. Shear connectors when provided in transverse direction does not seem the influence the behaviour of the slab. However, when transverse shear connectors are provided along with longitudinal connectors the behaviour improves slightly.slab that acts initially as a formwork is connected compositelywith in-situ concrete segments using shear connectors in orderto develop the required bending and shear resistance resultingin composite slab.In order for the composite slabs to exhibit monolithicbehaviour, the composite interface bond must remain intact. Ifthe bond is strong, the composite member will behave as asingle member when loaded as shown in Figure 1. and deformsimilar to a solid member. The fully bonded interface lets thehorizontal shear developed to be transferred along thenterface. The complete composite behaviour is shown instrains varying almost completely linear across the depth of the slab as shown in Figure. 2(a).

Item Type: Article
Uncontrolled Keywords: Truss shear connector, Composite slab,ATENA, Slab flexure test, Interface shear capacity
Subjects: Engineering > MIT Manipal > Civil Engineering
Depositing User: MIT Library
Date Deposited: 20 Oct 2016 09:48
Last Modified: 20 Oct 2016 09:48
URI: http://eprints.manipal.edu/id/eprint/147278

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