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Numerical study of balcony deformations taking into account the presence of thermal break system

Abstract : This paper deals with the development of a numerical model for predicting the behaviour of the balcony in buildings equipped with internal insulation and thermal break systems while taking into account the torsional stiffness of the lintel and other restraints. In fact, the equipment of thermal break systems can help to limit the problem of thermal bridge formed through structural components of balcony-floor junction. However the balcony deflections become important comparing to the non-equipped case. The latter is computed in common practices by considering the balcony-floor structure as continuous beams, submitted to only bending-flexural effect. In some cases, the lintel can be used as an intermediary element to reduce the deflection of the balcony. This horizontal reinforced concrete (RC) beam is submitted to a combined loading of flexion and torsion, which requires specific numerical model to resolve. In the proposed numerical modelling, the balcony-lintel-floor structure is represented by a beam grid model, in which the floor and balcony are divided into several bands perpendicular to the lintel. The lintel, considered as the main problem, is modelled using the finite element multi-fiber approach and the displacement-based formulation, which are capable of predicting the flexural and torsional behaviour of RC members. The same type of model with fewer degrees of freedom is also used to determine the flexural behaviours of the floor and that of the balcony. The thermal break behaviours are represented by a pair of rotational and axial springs in order to transmit the shear force and bending moment from the floor to the lintel. Another system of springs are also used to reproduce the axial and bending stiffness of the walls. While the efforts issued from the balcony and the walls can be determined explicitly, the presence of thermal break requires an iterative process to compute the displacement and rotation of the lintel.
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Contributor : Laurent Jonchère <>
Submitted on : Wednesday, June 9, 2021 - 11:18:43 AM
Last modification on : Friday, June 11, 2021 - 3:09:30 AM


Nguyen et al -2021 - Numerical...
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  • HAL Id : hal-03254882, version 1


Tuan-Anh Nguyen, Piseth Heng, Hugues Somja, Quang Huy Nguyen. Numerical study of balcony deformations taking into account the presence of thermal break system. Fib Symposium 2021: Concrete Structures: New Trends for Eco-Efficiency and Performance, Jun 2021, Lisbon, Portugal. ⟨hal-03254882⟩



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