The Deformation Control On Prestressed Concrete Beams

Prestressed concrete and reinforced concrete, as ordinary by reinforced tension and concrete pressure to provide internal force, so occasionally against prestressed concrete does not improve flexural strength of prestressed concrete, this paper mainly discusses the cracks and deflection of prestressed concrete. Include the following content.1.The The basic principle of prestressed concrete: the prestressing can postponed cracks and fissures, limit the spread, improve the section stiffness. Current rules for prestress loss calculation method, Prestressed concrete classification method and the manifestation of Prestressed degree.2.This paper lists the prestressed concrete beams of cracks and deflection control indexes and calculation method Based on the Chinese code. Due to the present rules for prestressed concrete structure deformation calculation relatively complicated, The writer references the domestic and overseas scholars about prestressed concrete structure simplified calculation method,such as load balance method, Using Cable-beam Offloading Method for calculating prestressed influence of cracks and deflection.3.Based on the actual engineering as an example, this paper introduces the Cable—beam method of Shared load. Using this method Calculates reinforced quantity, and use the equivalent load of constant load according to reverse input model calculation, thus calculated the Prestressed concrete beams crack, deflection and the Common reinforced. Through PREC1 modules of software PKPM for checking, two methods of calculating quite. Cable—beam method of Shared load is simple and clea. And it can provide reference for other similar projects.