Calculation of the composite timber­reinforced­concrete bending elements considering the nonlinear work of the joint

Authors

DOI:

https://doi.org/10.15587/1729-4061.2020.200527

Keywords:

timber-concrete structures, bending elements, nail joint, non-linear work, reinforcement

Abstract

A method has been proposed to calculate the composite timber-concrete bending elements taking into consideration the non-linear work of a nail joint and the stretched reinforcement in a slab. An acting building code regulates the structure estimation based on the linear-elastic work while the pattern of the joint's deformation under loading demonstrates a pronounced non-linear character. Estimation formulae do not account for the presence of reinforcement in a concrete slab, which leads to the irrational use of the structure's load-bearing properties.

A dependence has been proposed to determine the slip modulus. The determining coefficients are computed based on the rated characteristics given in the acting design standards.

An algorithm for calculating the composite timber-concrete bending structures has been given, taking into consideration the deformation diagram of the joint and reinforcement in the stretched zone of a concrete element.

It has been established that the normal stresses for the considered variants of timber-concrete beams, determined on the basis of the proposed procedure and the linear-elastic model, differ by 1‒8 %. At loads corresponding to plastic deformations, those stresses that were estimated in line with the linear-elastic model prove to be understated. At loads exceeding 0.75 kN/m for the beam with a span of 3 m, and 0.5 kN/m for the beam with a span of 5 m, stresses in the stretched region of a concrete slab exceed the concrete stretching strength while the stresses in a timber beam do not reach the ultimate values. In fact, in this case, the structure's load-bearing capacity is underutilized because the stretching effort in the cross-section with a crack is accepted by the reinforcement.

Based on the design features of timber-concrete floors (the thickness of a slab and protective layer), an analysis of the load-bearing capacity considering the reinforcement has been performed. It has been established that the load-bearing capacity of a slab ensures that an estimated bending momentum is tolerated up until the loads that cause the destruction of the timber beam. At the same time, the conditions for the rational operation of compressed concrete and stretched reinforcement are met

Author Biographies

Svitlana Shekhorkina, Prydniprovska State Academy of Civil Engineering and Architecture Chernyshevsky str., 24a, Dnipro, Ukraine, 49005

PhD, Associate Professor

Department of Reinforced Concrete and Masonry Structures

Mykola Savytskyi, Prydniprovska State Academy of Civil Engineering and Architecture Chernyshevsky str., 24a, Dnipro, Ukraine, 49005

Doctor of Technical Sciences, Professor

Department of Reinforced Concrete and Masonry Structures

Tetiana Nikiforova, Prydniprovska State Academy of Civil Engineering and Architecture Chernyshevsky str., 24a, Dnipro, Ukraine, 49005

Doctor of Technical Sciences, Associate Professor

Department of Reinforced Concrete and Masonry Structures

Kostiantyn Shliakhov, Prydniprovska State Academy of Civil Engineering and Architecture Chernyshevsky str., 24a, Dnipro, Ukraine, 49005

PhD, Associate Professor

Department of Reinforced Concrete and Masonry Structures

Anastasiia Myslytska, Prydniprovska State Academy of Civil Engineering and Architecture Chernyshevsky str., 24a, Dnipro, Ukraine, 49005

Postgraduate Student

Department of Reinforced Concrete and Masonry Structures

References

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Published

2020-10-31

How to Cite

Shekhorkina, S., Savytskyi, M., Nikiforova, T., Shliakhov, K., & Myslytska, A. (2020). Calculation of the composite timber­reinforced­concrete bending elements considering the nonlinear work of the joint. Eastern-European Journal of Enterprise Technologies, 5(7 (107), 14–21. https://doi.org/10.15587/1729-4061.2020.200527

Issue

Vol. 5 No. 7 (107) (2020): Applied mechanics

Section

Applied mechanics

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Copyright (c) 2020 Svitlana Shekhorkina, Mykola Savytskyi, Tetiana Nikiforova, Kostiantyn Shliakhov, Anastasiia Myslytska

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