This paper discusses the determination of prestressing force in statically indeterminate structures, where the prestressing force produces a secondary moment in addition to the primary moment. This condition is different from statically determinate ones as there is no secondary moment. In this paper the moment due to prestressing force is assumed to be a direct function of the prestressing force multiplied by a coefficient thus the prestressing force is obtained from the stress conditions of the bottom and top fibres under external loading. To show the application of the proposed procedure, a three-storey building is taken as an example.
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