Prestressed concrete structures IS-FCEE-00011

Description:
Idea of prestressed structures. Definitions. History of prestressed structures. Comparison of prestressed structures and concrete structures. Properties of concrete for prestressed structures and prestressing reinforcement. Technology of prestressed concrete (pre-tenstioned and post-tensioned prestressed concrete). Grout. Losses of prestress. Loss of prestressing due to friction. Anchorage set loss. Loss of prestressing due to immediate elastic strain in concrete. Loss of prestressing due to relaxation of reinforcement. Loss of prestressing due to creep and shrinkage of concrete. Effects of prestressing on concrete elements and structures, design of prestressing. Limitation of stress due to service load, limiting zone for the location of the tendon. Action stages of prestressed structures. Cross-section forming. Limitation of normal stresses due to service load effects. Crack resistance. Limiting zone for the location of the tendons. Limiting zone for the pressure line. Structural analysis of segmentally constructed prestressed structures. Ultimate resistance of elements subjected to axial force and bending moment. Elements subjected to shear and torsion. Analysis of the anchorage zone. Stress in the anchorage zone. Calculation model and check of zones under anchors. Reinforcement of the anchorage zone. Serviceability Limit State. Limitation of stress. Crack control. Deflection control. Examples of civil engineering prestressed structures.

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