Materials Science and Engineering Properties, SI Edition
1st Edition
ISBN: 9781305178175
Author: GILMORE, Charles
Publisher: Cengage Learning
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Chapter 8, Problem 89CQ
To determine
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A simply supported rectangular prestressed concrete beam, of span 13 m and its cross section as
shown in figure, is carrying a live load equals to 30 kN/m in addition to its weight, compute the
following stresses and compare it with ACI allowable stress:
a) Bottom fiber stress at support in initial stage.
b) Top fiber stress at mid span in final stage.
Use y = 24 kN/m³, As = 600 mm², initial stress of the prestressed steel = 1200 MPa, total losses
is 20%, fci = 22 MPa, and fo' = 28 MPa
800 mm
3 As
400 mm
As
340 mm
340 mm
A study of the properties of metal plate-connected trusses used for roof support yielded the following observations on axial stiffness index (kips/in.) for plate lengths 4, 6, 8, 10, and 12 in:
4: 320.2 409.5 311.0 326.5 316.8 349.8 309.7
6: 401.1 347.2 361.0 404.5 331.0 348.9 381.7
8: 395.4 366.2 351.0 357.1 409.9 367.3 382.0
10: 356.7 452.9 461.4 433.1 410.6 384.2 362.6
12: 415.4 441.8 419.9 410.7 473.4 441.2 465.8
USE SALT
Does variation in plate length have any effect on true average axial stiffness? State the relevant hypotheses using analysis of variance.
O Ho M1 M2 M3 = μ4=μ5
Ha
all five μ's are unequal
Ho: M1 M2 M3 #44 #μ5
Ha all five μ's are equal
Ho: M₁ μ2 43 #44 #μ5
H₁: at least two μ,'s are equal
O Ho M1 M2 M3 = μ4=μ5
Ha at least two μ's are unequal
Test the relevant hypotheses using analysis of variance with a = 0.01. Display your results in an ANOVA table. (Round your answers to two decimal places.)
Degrees of Sum of Mean
Source
Squares
Squares
f
freedom
Treatments
Error…
1-Define a cartesion system 2 identify the structure's supports and the type of structure (2D) or 3D 3-If the structure has more than one element dismember the structure and draw free body diagram(show all actions and reactions) on each element independently 4- Determine the type of suports 5- show the unkown supports reactions with any assumed direction but you cannot change the assumed force direction once you dicede 6-In a common joint, you can dicide on the force direction in one element, however, in the other one you need to follow the Newton'ns 3rd law and shoe the opposite direction 7- if you have multiple actions forces in the system, find force components for each foce independently use Sin/Cos/Tan functions to find forces components in two perpendicular directions 8- Add forces in each direction since they are paralled forces Rx=fx Ry=fy Rz= fy
Chapter 8 Solutions
Materials Science and Engineering Properties, SI Edition
Ch. 8 - Prob. 1CQCh. 8 - Prob. 2CQCh. 8 - Prob. 3CQCh. 8 - Prob. 4CQCh. 8 - Prob. 6CQCh. 8 - Prob. 7CQCh. 8 - Prob. 8CQCh. 8 - Prob. 9CQCh. 8 - Prob. 10CQCh. 8 - Prob. 11CQ
Ch. 8 - Prob. 12CQCh. 8 - Prob. 13CQCh. 8 - Prob. 14CQCh. 8 - Prob. 15CQCh. 8 - Prob. 16CQCh. 8 - Prob. 17CQCh. 8 - Prob. 18CQCh. 8 - Prob. 19CQCh. 8 - Prob. 20CQCh. 8 - Prob. 21CQCh. 8 - Prob. 22CQCh. 8 - Prob. 23CQCh. 8 - Prob. 24CQCh. 8 - Prob. 25CQCh. 8 - Prob. 26CQCh. 8 - Prob. 27CQCh. 8 - Prob. 28CQCh. 8 - Prob. 29CQCh. 8 - Prob. 30CQCh. 8 - Prob. 31CQCh. 8 - Prob. 32CQCh. 8 - Prob. 33CQCh. 8 - Prob. 34CQCh. 8 - Prob. 35CQCh. 8 - Prob. 36CQCh. 8 - Prob. 37CQCh. 8 - Prob. 38CQCh. 8 - Prob. 39CQCh. 8 - Prob. 40CQCh. 8 - Prob. 41CQCh. 8 - Prob. 42CQCh. 8 - Prob. 43CQCh. 8 - Prob. 44CQCh. 8 - Prob. 45CQCh. 8 - Prob. 46CQCh. 8 - Prob. 47CQCh. 8 - Prob. 48CQCh. 8 - Prob. 49CQCh. 8 - Prob. 50CQCh. 8 - Prob. 51CQCh. 8 - Prob. 52CQCh. 8 - Prob. 53CQCh. 8 - Prob. 54CQCh. 8 - Prob. 55CQCh. 8 - Prob. 56CQCh. 8 - Prob. 57CQCh. 8 - Prob. 58CQCh. 8 - Prob. 59CQCh. 8 - Prob. 60CQCh. 8 - Prob. 61CQCh. 8 - Prob. 62CQCh. 8 - Prob. 63CQCh. 8 - Prob. 64CQCh. 8 - Prob. 65CQCh. 8 - Prob. 66CQCh. 8 - Prob. 67CQCh. 8 - Prob. 68CQCh. 8 - Prob. 69CQCh. 8 - Prob. 70CQCh. 8 - Prob. 71CQCh. 8 - Prob. 72CQCh. 8 - Prob. 73CQCh. 8 - Prob. 74CQCh. 8 - Prob. 75CQCh. 8 - Prob. 76CQCh. 8 - Prob. 77CQCh. 8 - Prob. 78CQCh. 8 - Prob. 79CQCh. 8 - Prob. 80CQCh. 8 - Prob. 81CQCh. 8 - Prob. 82CQCh. 8 - Prob. 83CQCh. 8 - Prob. 84CQCh. 8 - Prob. 85CQCh. 8 - Prob. 86CQCh. 8 - Prob. 87CQCh. 8 - Prob. 88CQCh. 8 - Prob. 89CQCh. 8 - Prob. 90CQCh. 8 - Prob. 91CQCh. 8 - Prob. 92CQCh. 8 - Prob. 93CQCh. 8 - Prob. 94CQCh. 8 - Prob. 95CQCh. 8 - Prob. 96CQCh. 8 - Prob. 97CQCh. 8 - Prob. 98CQCh. 8 - Prob. 99CQCh. 8 - Prob. 100CQCh. 8 - Prob. 101CQCh. 8 - Prob. 102CQCh. 8 - Prob. 103CQCh. 8 - Prob. 104CQCh. 8 - Prob. 105CQCh. 8 - Prob. 1ETSQCh. 8 - Prob. 2ETSQCh. 8 - Prob. 3ETSQCh. 8 - Prob. 4ETSQCh. 8 - Prob. 5ETSQCh. 8 - Prob. 6ETSQCh. 8 - Prob. 7ETSQCh. 8 - Prob. 8ETSQCh. 8 - Prob. 9ETSQCh. 8 - Prob. 10ETSQCh. 8 - Prob. 11ETSQCh. 8 - Prob. 12ETSQCh. 8 - Prob. 13ETSQCh. 8 - Prob. 14ETSQCh. 8 - Prob. 15ETSQCh. 8 - Prob. 16ETSQCh. 8 - Prob. 17ETSQCh. 8 - Prob. 18ETSQCh. 8 - Prob. 19ETSQCh. 8 - Prob. 20ETSQCh. 8 - Prob. 21ETSQCh. 8 - Prob. 8.1PCh. 8 - Prob. 8.2PCh. 8 - Prob. 8.3PCh. 8 - Prob. 8.4PCh. 8 - The frame of a space shuttle type vehicle must...
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