Foundation, Concrete and Earthquake Engineering

Strengthening of Buildings with Carbon Fiber Against Terrorist Attack

Carbon-fiber-reinforced polymer (CFRP), is a fiber-reinforced polymer made with carbon fibers which is very strong and light. Over the past two decades it becomes an increasingly notable material used in structural engineering applications. With its potential benefits in construction, it has also proved itself cost-effective in a number of field applications strengthening concrete, masonry, steel, cast iron, and timber structures.
Retrofitting has become the increasingly dominant use of the material in civil engineering, and applications include increasing the load capacity of old structures (such as bridges) that were designed to tolerate far lower service loads than they are experiencing today, seismic retrofitting, and repair of damaged structures. 
Carbon Fiber Column Wrap

carbon laminate to beams and slabs
Fig: A and B carbon laminate to beams and slabs.
Recently it has been discovered a way to protect buildings from a terrorist attack - retrofit buildings with carbon fiber. This is due to the fact that carbon fiber reinforced polymer (CFRP)  fabric can carry 143,000 pounds of force per square inch and has various applications to strengthen reinforced concrete buildings.
To protect a building from an extreme event, CFRP can be used to increase the bending capacity of walls or columns of threatened buildings. Now an anchor is used that embeds in the column or joint to make CFRP more effective. In that work, the anchors allow the CFRP to reach its full tension strength rather than separating from the concrete at only about half its strength.
September 11th, 2001 Twin Towers Attack

Carbon Fiber to Retrofit Against Terrorist Attack
CFRP can be used to protect an entire wall from an explosion. To study the effectiveness of different ways of applying CFRP, with the help of U. S. Army Engineer Research and Development Center (ERDC) explosives are detonated near CFRP-reinforced concrete slabs.

CFRP, when layered and anchored, provided a significant amount of protection. However, applying additional protection to the front of the concrete slab, such as a steel plate, would enhance the slab's performance.
 Taj Mahal Palace,Mumbai Terrorist Attack

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