(i) Sketch the cross section and calculate the second moment of area (Ixx) for the compound section. (ii) Calculate the maximum uniformly distributed load (UDL) the beam can carry if the flange plates extend over the whole 7 m span. (iii) Calculate the minimum central length over which the additional flange plates are required.
(i) Sketch the cross section and calculate the second moment of area (Ixx) for the compound section. (ii) Calculate the maximum uniformly distributed load (UDL) the beam can carry if the flange plates extend over the whole 7 m span. (iii) Calculate the minimum central length over which the additional flange plates are required.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Q3
A compound beam consists of a standard I section 402 mm deep and 181 mm wide with a steel plate
200 x 25 mm deep welded to each flange. Given that the beam is simply supported over a length of 7
m, Ixx for the standard I section alone is 210.12 x 10°mm* and the maximum allowable bending stress
is given in the table below, then:
Allowable value of bending stress
| 350 N/mm?
(i)
Sketch the cross section and calculate the second moment of area (Ixx) for the
compound section.
(ii)
Calculate the maximum uniformly distributed load (UDL) the beam can carry if the
flange plates extend over the whole 7 m span.
(iii)
Calculate the minimum central length over which the additional flange plates are
required.
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