Materials for Civil and Construction Engineers (4th Edition)
4th Edition
ISBN: 9780134320533
Author: Michael S. Mamlouk, John P. Zaniewski
Publisher: PEARSON
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Question
Chapter 10, Problem 10.3QP
To determine
Selection of wood sample for construction based on the specific gravity value.
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Students have asked these similar questions
3. A simple lab test for specific gravity, G, on two samples of lumber indicate that sample A has G
0.4 and sample B has G = 0.5. Based on this information alone, which wood sample would be
best for a structural member of a construction project?
%3D
Sample A
Sample B
Either Sample A or Sample B
Both Sample A and Sample B
A pine wood specimen was prepared with actual dimensions of 50 mmx50 mm x 250 mm and grain
parallel to its length. The deformation was measured over a gauge length of 200 mm. The specimen
was subjected to compression parallel to the grain failure. The load- deformation results are shown in
table below:
Load (kN)
Deformation (mm)
8.9
0.457
17.8
0.597
26.7
0.724
34.5
0.838
43
0.965
52.9
1.118
62.01
1.27
71.03
1.422
80.1
1.588
89
1.765
99.6
1.956
108
2.159
111.3
2.311
112
2.456
a. Using a computer spreadsheet program, plot the stress-strain relationship.
b. Calculate the modulus of elasticity.
С.
What is the failure stress?
For the purpose of designing wood structures, laboratory-measured strength properties are adjusted for application conditions. State five different applica-tion conditions that are used to adjust the strength properties.
Chapter 10 Solutions
Materials for Civil and Construction Engineers (4th Edition)
Ch. 10 - What are the two main classes of wood? What is the...Ch. 10 - Prob. 10.2QPCh. 10 - Prob. 10.3QPCh. 10 - Discuss the anisotropic nature of wood. How does...Ch. 10 - Prob. 10.5QPCh. 10 - Prob. 10.6QPCh. 10 - Prob. 10.7QPCh. 10 - Prob. 10.8QPCh. 10 - Prob. 10.9QPCh. 10 - Prob. 10.10QP
Ch. 10 - Prob. 10.11QPCh. 10 - Prob. 10.12QPCh. 10 - Prob. 10.13QPCh. 10 - Prob. 10.14QPCh. 10 - Prob. 10.15QPCh. 10 - Prob. 10.16QPCh. 10 - Prob. 10.17QPCh. 10 - Prob. 10.18QPCh. 10 - Prob. 10.19QPCh. 10 - Prob. 10.20QPCh. 10 - Prob. 10.21QPCh. 10 - Prob. 10.22QPCh. 10 - Prob. 10.23QPCh. 10 - A wood specimen was prepared with actual...Ch. 10 - A pine wood specimen was prepared with actual...Ch. 10 - Prob. 10.26QPCh. 10 - Prob. 10.27QPCh. 10 - Prob. 10.28QPCh. 10 - Prob. 10.29QPCh. 10 - Prob. 10.30QPCh. 10 - Prob. 10.31QPCh. 10 - Prob. 10.32QPCh. 10 - Prob. 10.33QP
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Similar questions
- Collect a variety of samples of wood species used in construction and conduct various tests, such as:- Tension and compression tests.arrow_forwardCompute the modulus of elasticity of the wood species whose stress–strainrelationship is shown in Figure 10.12, using both the SI and English units.Compare the results with the typical values shown in Table 1.1 in Chapter 1and comment about the results.arrow_forwardA wood with a dimension 53 mm and 131 mm with 131 mm is side positioned vertically is subjected to ASTM D198 Test the length of the sample is 51 cm. If the modulus of rupture is limited to 100 mpa, using the following method determine if the sample passed in the test. Value of P is 134 kN. a. two-point b. third point c. center-point loadingarrow_forward
- A simple lab test for specific gravity (SG), on two samples of timber indicate thatsample A has SG=0.4 and sample B has SG=0.5. Based on this information alone,which wood sample would you choose as a structural member for your constructionproject? Briefly explain your reason.arrow_forwardA wood specimen having a square cross section of 2-inch x 2-inch (actual dimensions) was tested in bending by applying a load at the middle of the span, where the span between the simple supports was 28 inches. The deflection under the load was measured (see below). Plot the load versus deflection relationship. Identify the proportional limit on the diagram. Calculate the modulus of rupture. Does the modulus of rupture truly represent the extreme fiber stresses in the specimen? Comment on the assumptions used to compute the modulus of rupture and the actual response of the wood specimenarrow_forwardA 100 mm * 100 mm wood lumber was subjected to bending with a span of 1.5 m until failure by applying a load in the middle of its span. The load and the deflection in the middle of the span were recorded as shown in Table P10.21. a. Using a computer spreadsheet program, plot the load–deflection relationship. b. Plot the proportional limit on the graph. c. Calculate the modulus of rupture (flexure strength).arrow_forward
- please answer these two question 1.Explain the reason that flexural modulus of elasticity and compression test modulus of elasticity must be considered separately when both the flexural test and the parallel to grain compressive test caused normal stresses parallel to the grain of the wood. 2. Discuss the difference between isotropic and orthotropic materials for wood.arrow_forwardTo evaluate the mechanical properties of wood, structural-size specimens orsmall, clear specimens can be tested. Which technique is more important?Why? What is the most common test used in each technique?arrow_forwardConstruction lumber can be cut from the tree using one of two methods or acombination of them. Name these two methods and show a sketch of each.What is the main advantage of each method?arrow_forward
- A wood element had 150 mm diameter (radial direction) and a length of 1 m. The moisture content of the wood is 130% when it was prepared. After seasoning, the moisture content was reduced to 5%. Find the diameter and length of the seasoned element if the moisture- shrinkage relation follows the figure below.(Hint: you should use the curve for radial shrinkage for diameter and longitudinal shrinkage for length change in figure, FSP=28% according to the figure)arrow_forwardNOTE: Refer to MM = 08 and DD = 26arrow_forwardA solid wood cylinder of specific gravity 0.6 is 450 mm in diameter and 1000 mm high. If placed vertically in sea water, would it be stable? Explain your findings.arrow_forward
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