A beam that is part of a rigid frame has end moments and midspan moments for dead, live, andearthquake loads shown below. Determine the governing load combination for both negativeand positive moments at the ends and midspan of the beam. Earthquake load can act in eitherdirection, generating both negative and positive moments in the beam. Given X = -190 ft-kip.End Moments (ft-kip) Mid span Moments (ft-kip)Dead Load+90Live Load+1500X-150Earthquake +80

Answered: A beam that is part of a rigid frame…

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 beam that is part of a rigid frame has end moments and midspan moments for dead, live, and
earthquake loads shown below. Determine the governing load combination for both negative
and positive moments at the ends and midspan of the beam. Earthquake load can act in either
direction, generating both negative and positive moments in the beam. Given X = -190 ft-kip.
End Moments (ft-kip) Mid span Moments (ft-kip)
Dead Load
+90
Live Load
+150
0
X
-150
Earthquake +80

Expert Solution

Step 1

Dead load and Live load :

Dead loads are static forces that remain relatively constant over time. They can be tensed or compressed. The term can refer to a laboratory test method or to how a material or structure is used in everyday life. Variable or moving loads are commonly referred to as live loads.

Given :

End moment (ft-k)	Mid-span moment (ft-k)
dead load X	+90
live load -150	+150
earthquake load $\pm$	0

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