A prestressed beam of a certain condominium was designed to have a rectangular section 300mm x 600mm deep and has a simple span of 9m. At the midspan section, the tendons are placed at 200mm above the soffit which carries an initial prestressing force of 1,110KN which ultimately relaxes to 880 KN. If the allowable stress in concrete in compression is 13.5 MPa and in tension is 1.4MPA, determine the safe moment it could carry and the superimposed live load that it could also carry. Assume concrete will not crack in tension.

A prestressed beam of a certain condominium was designed to have a rectangular section 300mm x 600mm deep and has a simple span of 9m. At the midspan section, the tendons are placed at 200mm above the soffit which carries an initial prestressing force of 1,110KN which ultimately relaxes to 880 KN. If the allowable stress in concrete in compression is 13.5 MPa and in tension is 1.4MPA, determine the safe moment it could carry and the superimposed live load that it could also carry. Assume concrete will not crack in tension.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Design criteria for structural loading

The different loads such as loads due to self-weight (dead load) and external loads such as live load, wind loads, seismic load, snow load, and other loads and load combinations that influence the design of a building are called structural loading. The nature of the applied load differs from changes in the location, design, and type of materials used. The design criteria require that structures must be designed and constructed to be able to withstand all load types that are expected to act upon the structure and render its usage for the designated purpose. The structural members such as beams, slabs, columns, and foundations help the structure to withstand the applied load. There are different institutes such as ASCE and ACI that provide building design codes to assure minimum safety requirements and quality of the structures.

Question

A prestressed beam of a certain condominium was designed to have a rectangular section 300mm x 600mm deep
and has a simple span of 9m. At the midspan section, the tendons are placed at 200mm above the soffit which
carries an initial prestressing force of 1,110KN which ultimately relaxes to 880 KN. If the allowable stress in
concrete in compression is 13.5 MPa and in tension is 1.4MPA, determine the safe moment it could carry and the
superimposed live load that it could also carry. Assume concrete will not crack in tension.

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