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Q. What are the Parasitic forces for prestressing?
In statically determinate structures, prestressing forces will cause the concrete structures to end upwards. Therefore precambering is generally carried out to counteract such effect and make it more pleasant in appearance. Though for statically indeterminate structures the deformation of concrete members are restrained by the supports and consequently parasitic forces are developed by prestressing force in addition to bending moment produced by eccentricity of pre stressing tendons. The developed forces at support modify the reactions of concrete members subjected to external loads and generates secondary moments (or parasitic moments) in the structure.
if the diameter of the base remains constant by what factor should the altitude be multiplied to produce a cone with twice volume as the original
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why the force is resolved
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Extreme fiber stresses at the mid span section of the beam A pre-stressed concrete beam, of cross section 300 mm x 500 mm and 8 m span, is pre-stressed with a parabolic tend
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