3. A rigid block weighing 12 kips is supported by three rods symmetrically placed as shown in Fig 2-14. Assuming the block to remain horizontal, determine the stress in each rod after a temperature rise of 100 ° F. The lower ends of the rods are assumed to have been at the same level before the block was attached and the temperature changed. Use the data in the following table: Bronze L = 3 ft Steel Steel L = 2 ft L 2 ft Por W = 12 000 lb Figure 2-14 Free-body diagram. Each steel rod Bronze rod Area in in? 3/4 1.5 E in psi Coefficient of linear expansion in in/ (in• °F) 29 x 10 6 12 x 10 6 6.5 x 10 -6 10 x 10 -6

3. A rigid block weighing 12 kips is supported by three rods symmetrically placed as shown in Fig 2-14. Assuming the block to remain horizontal, determine the stress in each rod after a temperature rise of 100 ° F. The lower ends of the rods are assumed to have been at the same level before the block was attached and the temperature changed. Use the data in the following table: Bronze L = 3 ft Steel Steel L = 2 ft L 2 ft Por W = 12 000 lb Figure 2-14 Free-body diagram. Each steel rod Bronze rod Area in in? 3/4 1.5 E in psi Coefficient of linear expansion in in/ (in• °F) 29 x 10 6 12 x 10 6 6.5 x 10 -6 10 x 10 -6

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

Methods to Determine Vertical Stress

The load applied to the soil is transferred to the underground. The presence of water at soil pores and solid grains above the soil are the primary components that are responsible for the effective load transfer. Due to the load acting, the internal component of the soil or the underground formations undergoes deformations or a tectonic shift. The amount of deformation depends upon the amount of load acting on the soil surface, which indeed, depends on the weight of everything present above the soil. Due to this, the underground soil element develops internal stresses which try to resist the tectonic changes.

Question

3. A rigid block weighing 12 kips is supported by three rods symmetrically placed as shown in Fig
2-14. Assuming the block to remain horizontal, determine the stress in each rod after a
temperature rise of 100 ° F. The lower ends of the rods are assumed to have been at the same
level before the block was attached and the temperature changed. Use the data in the following
table:
Bronze
L = 3 ft
Steel
Steel
L = 2 ft
L = 2 ft
Pt
Por
P.
W = 12 000 lb
Figure 2-14 Free-body diagram.
Each steel rod
Bronze rod
Area in in?
E in psi
Coefficient of linear expansion
in in/ (in• °F)
3/4
29 x 10 6
1.5
12 x 10 6
6.5 x 10 -6
10 x 10 -6

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