3. The rigid bar ABC is pinned at B and attached to the two vertical rods.Initially, the bar is horizontal and the vertical rods are stress-free.Determine the stress in the steel rod if the temperature of the bothrods is decreased by 30°C. Neglect the weight of bar ABC.SteelL=0.9 mA 300 mmE= 200 x 10 N/m'a= 11.7 um/(m C)AluminumL=1.2 mA = 1200 mmE = 70 x 10 N/ma= 23 pum/(m "C)Answer:OstB0.6 m1.2 m

Contraction of steel , assuming complete freedom δTst=αL∆TδTst=11.7×10-690030δTst=0.3159mm The steel…

Answered: d at B and attached to the two vertical…

d at B and attached to the two vertical rods. tal and the vertical rods are stress-free. e steel rod if the temperature of the both Neglect the weight of bar ABC.

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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Concept explainers

System of Forces

A force is an external influence or agent that changes the state of a system. According to Newton's second law, the force applied to a body is proportional to the change in momentum of a body. Hence, whenever a force is applied to a body, its momentum changes. If the body is at rest, under the action of force, its state of rest changes to motion. In other words, the magnitude of the momentum of the body changes from zero to a measurable value. Similarly, if the body possesses some initial velocity, it has some associated momentum, the effect of force can cause the body to halt or come to rest, that is, the momentum reduces to zero.

Question

3. The rigid bar ABC is pinned at B and attached to the two vertical rods.
Initially, the bar is horizontal and the vertical rods are stress-free.
Determine the stress in the steel rod if the temperature of the both
rods is decreased by 30°C. Neglect the weight of bar ABC.
Steel
L=0.9 m
A 300 mm
E= 200 x 10 N/m'
a= 11.7 um/(m C)
Aluminum
L=1.2 m
A = 1200 mm
E = 70 x 10 N/m
a= 23 pum/(m "C)
Answer:
Ost
B
0.6 m
1.2 m

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