All A prestressed concrete beam has a wldth of 300 mm and an overall depth of 600 mm. The prestressing tendons are placed at a distance "e" below the neutral axis of the beam and the applied prestressing force is P in kN. There is 15% loss of prestress. 1. Determine the values of P when the compressive stress in the entire cross- section is 21 MPа. 2. Determine the values of e when the compressive stress in the entire cross- section is 15 MPа. 3. Determine the values of P and e when the compressive stresses at top and bottom of the beam are 2 MPa and 12 MPa, respectively. 4. Determine the Stress at top of the beam due to prestress only. If the initial prestressing force of 500 kN at an eccentricity of 250 mm at midspan.

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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.