A prestress concrete beam of section 200 mm wide and 300 mm deep is used over an effective span of 6m to support an imposed load of 4kN/m. The density of concrete is 24 kN/m3. Find the (a) The dead load moment (Mg) in kNm shall be equals to (b) The live load moment (Mq) in kNm shall be equals to (c) Tensile stress at the bottom fibre due to live and dead loads in N/mm2 is (d) At the centre of span section of the beam,find the magnitude of the concentric prestressing force in kN neccesary for zero fibre-stress at the soffit when the beam is fully loaded. (e) At the centre of span section of the beam,find the magnitude of the eccentric prestressing force in kN located 100 mm from the bottom of the beam which would nullify the bottom fibre stress due to loading.
A prestress concrete beam of section 200 mm wide and 300 mm deep is used over an effective span of 6m to support an imposed load of 4kN/m. The density of concrete is 24 kN/m3. Find the
(a) The dead load moment (Mg) in kNm shall be equals to
(b) The live load moment (Mq) in kNm shall be equals to
(c) Tensile stress at the bottom fibre due to live and dead loads in N/mm2 is
(d) At the centre of span section of the beam,find the magnitude of the concentric prestressing force in kN neccesary for zero fibre-stress at the soffit when the beam is fully loaded.
(e) At the centre of span section of the beam,find the magnitude of the eccentric prestressing force in kN located 100 mm from the bottom of the beam which would nullify the bottom fibre stress due to loading.
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