Describe about the Prestressed concrete

Civil engineering structures, such as buildings, bridges, dams, towers etc. and their structural components such as beams, columns, slabs and foundations are generally subjected to various types of loads. These loads produce strains and consequently stresses develop in them. We know that if stresses exceed the material strength, the material of the structural component may crack. Cracking of a structural component may lead to a deterioration of its load bearing capacity and it may be responsible for its failure sometime.