Shear at the Interface between Composite Parts of Prestressed Concrete Section

Jaroslav Navrátil; Lukáš Zvolánek

doi:10.4028/www.scientific.net/AMM.752-753.763

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 752-753Shear at the Interface between Composite Parts of...

Shear at the Interface between Composite Parts of Prestressed Concrete Section

Abstract:

Composite concrete beams made of prefabricated prestressed or non-prestressed element and cast-in-place reinforced concrete slab became very popular in present-day civil engineering practice. Two concrete composite parts of beam are cast at different times. Different moduli of elasticity, consecutive load application, and differential creep and shrinkage cause unequal strains and stresses in two adjacent fibers of construction joint. The requirement is to ensure that both parts act fully compositely, because the bending and shear designs of composite members are based on this assumption. Therefore the level of shear stresses at the interface between two parts must be limited. The objective of the paper is to review the methods for the calculation of shear stresses in construction joint, and to evaluate the influence of different age of two concrete composite parts on the level of shear stresses. Calculation method alternative to Eurocode 2 method is proposed and tested. It is recommended to calculate the shear stress from difference of normal forces acting on sectional components in two neighboring sections of the element. It was observed that differential shrinkage of concrete components can significantly affect the stress distribution. Numerical studies were performed based on real-life examples of composite beams.

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Periodical:

Applied Mechanics and Materials (Volumes 752-753)

Pages:

763-768

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.752-753.763

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Online since:

April 2015

Authors:

Jaroslav Navrátil*, Lukáš Zvolánek

Keywords:

Composite Concrete Beams, Construction Joint, Creep, Design, Eurocode, Shear, Shrinkage, Stress Redistribution

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* - Corresponding Author

References

[1] EN 1992-1-1. Eurocode 2: Design of Concrete Structures – Part 1-1: General rules and rules for buildings, European Committee for Standardization, (2011).

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[2] J. Navrátil, IDEA StatiCa Prestressing, User guide, IDEA RS s. r. o., U Vodarny 2a, 616 00 BRNO, www. idea-rs. com.

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