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Topologie des champs de contraintes pour le dimensionnement des structures en béton armé

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The mechanics of punching in reinforced concrete slabs and footings without shear reinforcement

João Tiago Ramos Bernardo de Santa Rita Simões

Punching shear failures of structural concrete members have been the focus of attention of numerous works presented over the last decades. Although various rational approaches have been developed to predict these failures, there is still no unanimity on a ...

EPFL2018

FRP-to-concrete debonding - global and local bond behaviour

Ardalan Hosseini

FRP (fiber reinforced polymer) strips are used to flexurally strengthen reinforced concrete (RC) beams. The global bond strength namely the maximum transferable bond stress due to the increase of FRP tensile stress in a cracked concrete element (subsequent ...

2018

Analysis and design of a reinforced concrete deep beam with high thickness

The objective of this work concerns the analysis and design of an existing deep beam with a high thickness in reinforced concrete, according to the standards defined in the Eurocode. The structure is inserted in a hydroelectric plant in the Alentejo region ...

2018

Biomimetic behavior includes aspects such as learning from previous experience, self-diagnosis, and adaptation. This thesis describes control methodologies that are essential to development towards biomimetic behavior of a complex deployable structure. Sim ...

EPFL2018

Lanthanide mechanoluminescence

Jean-Claude Bünzli

Mechanoluminescence (ML) is the emission of light consecutive to a mechanical force or stress imposed to a crystalline material. Many inorganic and organic compounds present this phenomenon that is known for over 400 years. Lanthanide and uranyl salts were ...

Elsevier Science Bv2018

Shape memory alloy (SMA) strips for fatigue strengthening of cracked steel plates

Ardalan Hosseini, Elyas Ghafoori

This paper aims to show the feasibility of application of iron-based shape memory alloy (Fe-SMA) for fatigue strengthening of steel plates. The effectiveness of the proposed retrofit system was also compared with that of prestressed carbon-fiber reinforced ...

2018

Development of a consistent approach for design and assessment of structural concrete members using stress fields and strut-and-tie models

Filip Niketic

Designing new concrete members and assessing the strength of existing elements subjected to in-plane stress state conditions is often conducted by means of Stress Fields (SF) and Strut-and-Tie Models (STM). These methods are usually accounting for identica ...

EPFL2017

Stress fields for the interaction of in-plane and out-of-plane forces in reinforced concrete shell elements

Marie-Rose Backes

Plane reinforced concrete (RC) elements are used in a large variety of structures. Their principal function is to carry forces that act in the plane of the element, but external actions and connections to other structural elements generally introduce addit ...

EPFL2017

Design versus Assessment of Concrete Structures Using Stress Fields and Strut-and-Tie Models

Aurelio Muttoni, Filip Niketic, Miguel Fernández Ruiz

Stress fields and strut-and-tie models are widely used for design and assessment of structural concrete members. Although they are often used in the same manner for both purposes, developing suitable stress fields and strut-and-tie models for the design of ...

2015

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Quenched and self-tempered (QST) steel reinforcement bars (rebars) are manufactured by Thermex or Tempcore processes. Characterization studies of QST rebars are mostly limited to reveal the hardened outer layer and some improved mechanical properties compa ...

Asce-Amer Soc Civil Engineers2015