Portal Frame Series : Post - Tensioned

Post Tensioned floor system is a common technology used these days.Engineers use post-tensioning as a way to reinforce concrete by prestressing it. The compression is done after the concrete has been poured and cured. A set of tendons are tensioned by hydraulic jaks that react against the concrete memeber itself.
When the tendons have streched sufficiently, they are wedged in position and maintain tension after the jacks are removed, tranferring the pressure to the concrete.

Main Benefits of this system:
While concrete is strong in compression, it is weak in tension. Steel is strong under forces of tension, so combining the two elements results in the creation of very strong concrete components. Post-tensioning can help create innovative concrete components that are thinner, longer and stronger than ever before. Many of today's "High performance" concrete structure, including many landmark, bridges and buildings employ this system of reinforcement.