Question 2 (a) Describe the different types of external loads that beams carry (

Question

Question 2 (a) Describe the different types of external loads that beams carry (b) A T-section beam has the following dimensions: width of flange, 80 mrn; overall depth, ¡00 mm: thickness of stem and flange, 10 mm. It is a simply supported beam with the stem vertical and tlange at the top. Determine the maximum moment that can be sustained by the beam if the allowable stresses are 60MN/m2 in tension and 45MN/m2 in compression. The second moment of section through the neutral axis, Ixx 1672992mm', and distance from bottom of stem to neutral axis 68.5mm. 80 mm 10mm 90 mm 68.3 mm 0mm uestion 3

Explanation / Answer

a) Different types of external loads that beam carry are

i) Point load

ii) uniformly distributed load

iii) Live load

b) Ixx=1672992 mm4

Depth of neutral axis from top Ytop= 100-68.5 mm

Mtop = ( Allowable stress in compression * Ixx) / Ytop

Mtop = (45 * 1672992) / 31.5 = 2389988.571 Nmm

Mtop= 2.39KNm

Mbottom = ( Allowable stress in tension * Ixx ) / Ybottom

= ( 60 * 1672992) / 68.5 = 1465394.453 Nmm

Mbottom= 1.465 KNm

  

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