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Featured researches published by Jérémy Bleyer.


Archive | 2018

Numerical Yield Design Analysis of High-Rise Reinforced Concrete Walls in Fire Conditions

Jérémy Bleyer; Duc Toan Pham; P. de Buhan

The present contribution aims at developing a numerical procedure for predicting the failure of high rise reinforced concrete walls subjected to fire loading conditions. The stability of such structures depends, on the one hand, on thermal strains inducing a curved deformed configuration and, on the other hand, on a local degradation of the constitutive material strength properties due to the increase of temperature across the wall thickness. A three step procedure is proposed, in which the yield design (limit analysis) method is applied on two separate levels. First, an up-scaling procedure on the wall unit cell is considered as a way for assessing the generalized strength properties of the curved wall, modelled as a shell, by taking into account reduced strength capacities of the constitutive materials. Secondly, the overall stability of the wall in its fire-induced deformed configuration is assessed using lower and upper bound based on shell finite elements and the previously determined temperature-dependent strength criterion. Second-order cone programming problems are then formulated and solved using state-of-the-art solvers. Different illustrative applications are presented to investigate the sensitivity of the wall stability to geometrical parameters. Finally, the influence of imperfect connections between panels is also considered using a simple joint behaviour.


Archive | 2017

The “Mixed Modeling” Approach to Reinforced Structures

Patrick de Buhan; Jérémy Bleyer; Ghazi Hassen

Most civil engineering structures involving inclusion-reinforced materials, such as reinforced concrete beams and slabs or reinforced geotechnical structures, are commonly designed by resorting to an implicit mechanical model in which the material to be reinforced (concrete, soil, rock, etc.) is regarded as a three-dimensional ( 3D ) continuous medium , whereas the reinforcing inclusions (steel bars, piles or geomembranes) are treated as one-dimensional ( 1D ) (beams) or two-dimensional ( 2D ) (plates) structural elements . Hence, the denomination of “ mixed modeling ” to which this chapter is devoted.


Elastic, Plastic and Yield Design of Reinforced Structures | 2017

The Homogenization Approach: Reinforced Materials as Macroscopically Homogeneous Anisotropic Media

Patrick de Buhan; Jérémy Bleyer; Ghazi Hassen

While the “mixed modeling” approach provides a simplified, but suitable method for designing reinforced structures, as far as a limited number of inclusions is involved, it obviously becomes inappropriate in two frequently encountered situations. First in the case when the number of inclusions is very large (up to several hundreds); second when the stiffness or strength characteristics of the reinforcing material are not so much greater than those of the surrounding matrix material, so that, in spite of their geometrical slenderness, the inclusions can hardly be modeled as one-dimensional (1D) beam or two-dimensional (2D) membrane elements. As will be seen further on, a typical illustration of the latter situation is provided by the example of foundation soils improved by columnar inclusions.


Elastic, Plastic and Yield Design of Reinforced Structures | 2017

Applications of the Multiphase Approach Part 2: Load-Bearing Capacity and Stability Analysis of Reinforced Structures

Patrick de Buhan; Jérémy Bleyer; Ghazi Hassen

This chapter discusses some recent applications of the multiphase model to the design of reinforced structures, which are being loaded beyond their initial yield point up to failure.


Elastic, Plastic and Yield Design of Reinforced Structures | 2017

Applications of the Multiphase Approach Part 1: Static and Dynamic Stiffness of Piled Raft Foundations

Patrick de Buhan; Jérémy Bleyer; Ghazi Hassen

This chapter are devoted to the presentation of some illustrative applications of the multiphase approach to geotechnical engineering problems involving soils reinforced by linear inclusions. The present chapter is more specifically focused on evaluating the overall stiffness of piled raft foundations under either (quasi) static or truly dynamic conditions, in the context of linear elasticity .


Elastic, Plastic and Yield Design of Reinforced Structures | 2017

Yield Design of Reinforced Concrete Beams, Plates and Shells

Patrick de Buhan; Jérémy Bleyer; Ghazi Hassen

This chapter addresses different aspects of the yield design of composite structural elements such as beams, plates and shells. A typical example of such a situation is the case of reinforced concrete members. The aim of this chapter is to show how to derive macroscopic strength properties in terms of generalized stresses such as membrane forces and bending moments in order to perform the yield design at the structure level. This “up-scaling” procedure will make use of homogenization concepts such as those presented in the previous chapters. Since complete analytic solutions are rarely available, related numerical aspects will also be briefly discussed.


Elastic, Plastic and Yield Design of Reinforced Structures | 2017

Mechanical Modeling of Reinforced Materials as Multiphase Systems

Patrick de Buhan; Jérémy Bleyer; Ghazi Hassen

The concept of a multiphase model of heterogeneous media, such as reinforced materials, originates from the basic intuition that the macroscopic behavior of this kind of materials can be appropriately described as the superposition of several (and not only one as in the classical homogenization procedure) continua, called phases . It is therefore strongly reminiscent of that classically developed in the field of poromechanics where a fluid saturated porous solid (soil or rock) is modeled by two such mutually interacting fluid and solid phases. It should be noted that, in closer connection to our topic, this concept had been already advocated by Stern and Bedford and Bedford and Drumheller for modeling the dynamic behavior of elastic laminates.


International Journal for Numerical Methods in Engineering | 2013

On the performance of non‐conforming finite elements for the upper bound limit analysis of plates

Jérémy Bleyer; Patrick de Buhan


Computers & Structures | 2013

Yield surface approximation for lower and upper bound yield design of 3D composite frame structures

Jérémy Bleyer; Patrick de Buhan


Computer Methods in Applied Mechanics and Engineering | 2015

Efficient numerical computations of yield stress fluid flows using second-order cone programming

Jérémy Bleyer; Mathilde Maillard; Patrick de Buhan; Philippe Coussot

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Ghazi Hassen

École des ponts ParisTech

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Mathilde Maillard

École des ponts ParisTech

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P. de Buhan

Centre national de la recherche scientifique

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Gabriel Peyré

Paris Dauphine University

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Hugues Vincent

École des ponts ParisTech

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Jean-Marie Mirebeau

Centre national de la recherche scientifique

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