Prestressed concrete as a building material, to overcome the inability of concrete to resist significant tensile stresses. Design of prestressed concrete and their characteristics. Operation and application of the principle of prestressed concrete.
ABCTRACT Prestressed concrete - a building material, concrete is designed to overcome the inability to resist significant stretching stresses. Construction of the prestressed concrete as compared to unstressed have a significantly smaller deflections and increased fracture toughness, having the same strength that allows you to cover large spans with equal cross-section element. In the manufacture of concrete laid armature of steel with high tensile strength, steel is then stretched with a special device and the concrete mixture is placed. After setting the pre-tensioning force of liberated steel wire or rope is passed to the surrounding concrete, so that it is compressed. This allows the creation of compressive stress is partially or completely eliminate the tensile stress on the operational load. CONTENTS INTRODUCTION CHAPTER 1. PRESTRESSED CONCRETE CHAPTER 2. OPERATION AND APPLICATION OF THE PRINCIPLE OF PRE-STRESSED CONCRETE CONCLUSION REFERENCES APPENDIX А INTRODUCTION Prestressed concrete is a method for overcoming concretes natural weakness in tension. It can be used to produce beams, floors or bridges with a longer span than is practical with ordinary reinforced concrete. It is often used in commercial and residential construction as a foundation slab. Prestressing tendons (generally of high tensile strength steel cable or rods) are used to provide a clamping load which produces a compressive stress that balances the tensile stress that the concrete compression member would otherwise experience due to a bending load.
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