a) A 406x178x54-1 steel section is strengthened by welding a 177.6mm x 6mm plate to one flange asshown in Fig Q2-1. Compute the plastic section modulus about major axis and the plastic momentof the section given fy = 350MPa.6mm10.9mm10.9mm7.6mm2PFig Q2-1b) A two-bay portal frame in Fig Q2-2 is subjected to the loads as shown. Compute the minimum loadP required to cause collapse.Fig Q2-2Hint: You should consider at least 3 mechanismsthe value of Mp obtained in (a) above can be used for the final numerical evaluation of thecollapse force P177.6mmBMpA3P402.6mm1.5Mp7mMpD3P1.5Mp7mMpE+₁10m

Answered: a) A 406x178x54-1 steel section is…

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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a) A 406x178x54-1 steel section is strengthened by welding a 177.6mm x 6mm plate to one flange as
shown in Fig Q2-1. Compute the plastic section modulus about major axis and the plastic moment
of the section given fy = 350MPa.
6mm
10.9mm
10.9mm
7.6mm
2P
Fig Q2-1
b) A two-bay portal frame in Fig Q2-2 is subjected to the loads as shown. Compute the minimum load
P required to cause collapse.
Fig Q2-2
Hint: You should consider at least 3 mechanisms
the value of Mp obtained in (a) above can be used for the final numerical evaluation of the
collapse force P
177.6mm
B
Mp
A
3P
402.6mm
1.5Mp
7m
Mp
D
3P
1.5Mp
7m
Mp
E
+₁
10m

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