Design And Analysis Of The Long-span Prestressed Concrete Frame Structure

In our civil engineering realm, the technique of prestressed concrete has been alreadyapplied more and more extensively. With the development of our society, more andmore long-span and large column-grid frame is to be applied in house building, publicbuilding and factory building. Because of its advantages to resolve the lacking ofstiffness of concrete beam, to nicely control the development of the cracks anddeflection, and also because of its nice economy in use, prestressed concrete has beenwidely used in long span continuous frame.Although the prestressed technology has been well applied in China, but there arestill some shortcomings in design when it is applied to long-span continuous frameconstruction. The designers are troubled with some problems, such as reasonableselection of the line shape of prestressed reinforcement and anchor zone, the influencecaused by the lateral restraint on prestressed loss, prestress loss of the super long-spanprestressed concrete beam, etc.This thesis provides four design schemes on the aspect of the design of prestressedconcrete beam and chooses the optimal design scheme after careful comparison. Itanalyzes the influence from the Lateral restraint influence coefficient and the thirdbending moment of single-layer single-span structure when the structure are single-layersingle-span structure, single-layer multi-span structure, single-span multi-layer structure,multi-layer multi-span structure, and according to domestic and international researchand a plenty of engineering practice, putting forward some helpful conclusions whichcan reduce the influence caused by the lateral restraint. This thesis not only verifies theformula of the influence from the lateral restraint but also studies the tension andreversed deflection of the prestressed beam by means of comparing the theoreticalanalysis values and the measured values which are got from the monitoring results ofthe construction stage and using stage of the prestressed beam in Anhui SanlianUniversity.