Numerical Engineering & Consulting Services
Society of scientific calculation specialized in Civil Engineering
Reinforced concrete cracking
Long term behaviour of pre-slab floor
- Studied structure: reinforced concrete slab on pre-slab with joints in between the pre slab
- Mechanical behaviour: concrete cracking, plasticity of reinforcements, slab / pre-slab decohesion, steel/concrete bond slip, autogenous creep, drying, drying shrinkage, thermal shrinkage
- Boundary conditions: embedded and simply supported on and into walls
- Load: body weight, exploitation load and permanent load
Objectives : To diagnose the probable causes of the origin of cracks, in between the joints and the pre-slabs, that appear after a few months passed the construction phase.
- Pre-slab positioning
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- 3D Model of the slab
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- Detailed 3D model of the joints
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- Deformation and detachment with time
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Reinforced concrete cracking
Mechanical behaviour of concrete pipes with steel liner
- Studied structure: reinforced concrete pipes with steel liner
- Mechanical behaviour: concrete cracking, plasticity of reinforcements, corrosion of the steel liner
- Boundary conditions: simply supported at the ends
- Load: applied force at mid-span, and internal hydraulic pressure
Objectives : To estimate the mechanical behaviour of a pipe with various scenarios of degradation of the steel liner. Simulations using 3D finite elements and comparison with experimental test results.
- Test setup
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- FE deformation and damage results
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- Force-deflection curve (test-simulation)
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Reference : Aster-Echos >> [PDF]
Reinforced concrete cracking
Ultimate load on aged and reinforced beams
- Studied structure: reinforced concrete beam (corroded reinforcements) + CFT reinforcements (Carbon Fiber Tissue)
- Mechanical behaviour: concrete cracking, plasticity of reinforcements, multifiber beams, CFT elements
- Boundary conditions: embedded at the base
- Load: body weight, horizontal load applied at the top of the beam
Objectives : To estimate the capacity of a reinforced concrete beam in various configurations (un damaged, corroded reinforcements, corroded reinforcements + reinforced by CFT) subdued to the effects of a lateral load at the top.
- Test/simulation comparisons
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- Cross-section of reinforced concrete
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Reinforced concrete cracking
Reinforced beam repaired with HPC (high performance concrete)
- Studied structure: reinforced concrete beam without frames
- Mechanical behaviour: concrete cracking (damage mechanics) and plasticity of reinforcements
- Boundary conditions: 3 point bending
- Load: monotonous vertical displacement applied at the centre (upwards)
Objectives : To measure the effectiveness of HPC repair on a beam where the concrete on 40% of its height (on the side of the compressed reinforcements) is totally degraded: global response of the beam (force/deflection) and evolution of the shear stress on the level of the repair interface. The predictive calculations were made thanks to the help of the COCASE calculation program.
- Force/deflection comparison between test and computations
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- FE stress results within each layer of elements
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Experimental tests made by Fabien PEREZ / CRIB Université Laval (Québec CANADA)
Reinforced concrete cracking
Reinforced slap under rolling load
- Studied structure: reinforced concrete slab built on a deformable ground
- Mechanical behaviour: concrete cracking (damage mechanics), plasticity of reinforcements
- Boundary conditions: slab supported by a deformable ground and friction contact
- Load: rolling load (a wheel of a truck)
OObjectives : To simulate the damage caused by a truck passing over a reinforced concrete slab. The slab is put on deformable ground. The slab may lift up from the ground and the movements of the slab on the ground are constrained by the Coulomb type friction.
- FE mesh of the slab (steel + concrete) and the ground
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- Evolution of the deformation and map of the cracks (damage) on the slab
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