Numerical Engineering & Consulting Services

References

NECS creates almost all of its studies and developments under two main platforms, Code_Aster® and Cast3M®. Hereafter an example of the company's studies and developments.

STUDIES

• Engineering evaluation of a Bonna pipe' resistance including some defects (holes and corrosion). Force / vertical deflexion relationship prediction. Comparison to experiment results.
• Thermo-hydro-mechanics behavior of buried structures. Use of Code_Aster® kits T-H-M.
• Support studies for a test building construction: control of vibrations. Evaluation of technical solutions provided for foundation in preliminary project, follow-up of building's behavior during construction and verification of analytical solutions by field measurements.
• Long-term behavior of reinforced concrete pre slabs. Simulation of a building floor's ageing effects, in order to determine all of the mechanisms that origine cracking.
• 3D analysis of dismantling work phasing developed for sensitive industrial structures. Mesh construction, simulation of prestressing, phasing of all of the steps of relieving cable tension.
• Analytical estimating of Load / ultimate deflexion of electric reinforced concrete posts, with or without reinforcement by composite materials. Comparison to experiment results.
• Dynamic behavior's evaluation of a damaged reinforced concrete bridge while a TGV is crossing it. Nonlinear transient dynamics analysis.
• Validating of some official code requirements (Eurocodes) defining thermal behavior of concrete elements exposed to fire.
• Evaluation of an office building's Fire resistance. Heat propagation and reheating in concrete by analytical simulation, taking account of damage or material degradation.
• Evaluation of the seismic response of industrial buildings. Reevaluation of official requirements for optimizing some seismic coefficient's values. Nonlinear transient dynamics analysis.
• Evaluation of damage during construction for a pre-stressed reinforced concrete bridge. 3D modeling and fine discretization of pre-stressed cables.
• Predicting Fire resistance of bricks. Contribution in shape optimization of the brick exposed to fire by the means of non linear transient thermo mechanical simulations.
• Behavior of a reinforced concrete slab impacted by a flexible projectile (plane). Modeling of a multi-layer shell, including damage in concrete, plastification of reinforcement rebars and appearing of plastic hinges on fixed edges. Non linear transient analysis.

DATA-PROCESSING DEVELOPMENTS IN Code_Aster®

• Development of Code_Aster® for Windows, version STA8.1 and STA8.2.
• Correcting of corrosion's constitutive relation in Code_Aster® for applications in industrial problematics.
• Development of a numerical tool allowing faster and more robust simulations for prediction of the ultimate capacity of reinforced concrete slabs subjected to loads.
• Development of a numerical tool allowing a quickly evaluation of the risk of cracking in concrete slabs resting on the soil and exposed to drying.
• Development of a numerical tool allowing a quickly evaluation of the risk of cracking in concrete walls during hydration and drying.
• Development of 3D joint elements and special subroutines for assembling to 3D solid mass grids.
• Development of a constitutive relation for friction between concrete and soil.
• Post processing of results by using multi-fiber beam elements in Code_Aster®.
• Implementation of constitutive relations for damage in concrete specifyed by French code BAEL (rectangle parabolic relationship).
• Development of thermal radiative elements and elastoplastic constitutive relation with negative hardening for the thermal mechanical behavior of the terra cotta elements.
• Development of special graphics tools for visualization of Code_Aster® results. 3D visualization at the point of integration and realistic view of the finite element grids.
• Development of a cyclic constitutive relation for concrete, on the basis of the parabola-rectangle relationship specified by BAEL 91.
• Development of a cyclic constitutive relation for plastic hinges describing zones of embedding for slabs, beams and columns of reinforced concrete, which are very important in transient dynamic analysis.
• Development of numerical tool allowing effective design of 2D and 3D structural elements built in High Strength concrete.