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Researchers plan to retrofit a school building in quake-prone Uttarakhand with a novel concrete coating that can dramatically enhance the earthquake resistance of seismically vulnerable structures. The seismic-resistant, fibre-reinforced concrete developed at the University of British Columbia UBC in Canada will see its first real-life application as part of the seismic retrofit of a Vancouver elementary school. The material is engineered at the molecular scale to be strong, malleable, and ductile, similar to steel - capable of dramatically enhancing the earthquake resistance of a seismically vulnerable structure when applied as a thin coating on the surfaces.
Researchers subjected the material, called eco-friendly ductile cementitious composite EDCC , to earthquake simulation tests using intensities as high as the magnitude 9.
EDCC combines cement with polymer-based fibres, flyash and other industrial additives, making it highly sustainable, according to Banthia. Choose your reason below and click on the Report button. This will alert our moderators to take action.
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Also they have low tensile and shear strength. Modern engineering has made lot of progress in developing various construction techniques that can construct structures to live through the anticipated earthquake exposure up to the expectations and in compliance with the applicable building codes.
For example, reinforced concrete structures are considered much safer as concrete resists compression forces, and reinforcing steel resists tensile forces produced by an earthquake. The exceptional ductility of the steel to resist tensile forces, coupled with the rock-like ability of concrete to resist compression make reinforced concrete an ideal material in earthquake prone zones. Reinforced concrete structures produce three most important earthquake resistance properties, namely, stiffness, strength, and ductility.
It should be noted that even a lightly reinforced concrete shear wall has over six times the racking load resistance as framed wall construction. It is due to this reason that modern reinforced concrete buildings were found to survive these recent earthquakes with rarely any significant damage. Such structures that will not be damaged in minor shaking and will avoid serious damage or collapse in a major earthquake.