Unbonede Prestressed Concrete Frame Structure Design Research

Prestressed concrete with unbonded tendons (BUPC) is a newly arisen technique in the concrete structure realm. Compared with prestressed concrete with bonded tendons, it abridges preformed hole, drifting steel, grouting craft etc, the method of laying steels is more agile; Compared with reinforced concrete, it strengthens the applicability of the building function, economizes a great deal of steel material and improves the structure to be subjected to the dint function clearly Therefore, be close to more than ten in the last yearses to construct the application in the structure to get the fast fierce development in our country.This dissertation sums up the state of study ande development of Prestressed Concrete with Unbonded Tendons structures, gives the method of unbonded prestressed concrete frame structure design, the calculation formula about the loss prestressing force of prestressed concrete structure with unbonded tendons, the stress of prestressed steel with unbonded tendons and the stress of concreterespectively, the limited bearing capacity of prestressed concrete with unbonded tendons member in bending and the checking calculation about regular service limited state of prestressed concrete with unbonded tendons member in bending. Passing the theoretical calculation and engineering actual measurement put forward the new understanding of friction coefficient to overlength stretch-draw prestressed steel with unbonded tendons, get to have the conclusion of the use reference value very much. Passing the practice of constructional engineering of efficient prestressed concrete with tendons, put forward the suggestion of easing the stress restrictive coefficient and tensile permission stress of concrete properly. The research achievemrnt of this paper has a useful reference to the design and construction of Prestressed Concrete with Unbonded Tendons structures.