Materials for Civil and Construction Engineers (2nd Edition)
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ISBN: 9781292154411
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Chapter 10, Problem 10.26QP
To determine
The engineering stress, the engineering strain, and the toughness of the wood specimen.
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Getting measurements from Figure 11.20, determine approximate values ofthe following items for plain concrete, concrete with 2% steel fibers, and concrete with 3% steel fibers:a. Modulus of elasticityb. Ultimate strengthc. Strain at failured. Toughness. Curves may be approximated with a series of straight lines.e. Comment on the effects of increasing the steel fiber content on items a, b,c, and d above.
if the stress at failure and bending is 7200 PSI for small, perfect samples of a certain species of wood, what is the allowable bending stress for a piece of lumber with defects that are judged to reduce the strength by 40%?
A 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).
Chapter 10 Solutions
Materials for Civil and Construction Engineers (2nd 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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- 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_forwardThe concrete weigh 8.5 kg. Find the specific weight of the concrete using the dimensions shown in the picture.arrow_forwardShow complete process. A tensile load of 150 kN is applied to a round metal bar with a diameter of 16 mm and a gage length of 80 mm. Under this load the bar elastically deforms so that the gage length increases to 80.1192 mm and the diameter decreases to 15.89 mm. Determine the modulus of elasticity (in MPa) and Poisson’s ratio for this metal.arrow_forward
- Compute 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_forwardSituation 1. From the given data of materials retained between consecutive sieves, compute the value of fineness modulusarrow_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_forward
- A wood specimen was subjected to bending until failure by applying a loadin the middle of its span. The specimen has a cross section of 1 in. * 1 in.(actual dimensions) and a span of 14 in. between the simple supports. Theload and the deflection in the middle of the span were recorded as shown inTable P10.22.a. Using a computer spreadsheet program, plot the load–deflectionrelationship.b. Plot the proportional limit on the graph.c. Calculate the modulus of rupture (flexure strength).arrow_forwardA tensile test was performed on a metal specimen with a diameter of 1⁄2 inch and a gage length (the length over which the elongation is measured) of 4 inches. The data were plotted on a load-displacement graph, P vs. ∆L. A best-fit line was drawn through the points, and the slope of the straight-line portion was calculated to be P y∆L 5 1392 kips yin. What is the modulus of elasticity?arrow_forwardA cylindrical block of wood 1 m in diameter and 1 m long has a specific weight of 7500 N/m3. Will it fl oat in water with its axis vertical? Show your complete solution.arrow_forward
- A wood beam is strengthened using two steel plates as shown in the figure below. *Inserted Photo* The beam has simple supports and an overhang and is subjected to a point load and a uniform load as shown in the figure below. Calculate the maximum tensile and compressive stresses of the beam. Assume that Ew = 11 GPa and Es = 200 GPa. (Enter your answers in MPa. Use the deformation sign convention.) maximum tensile stress in wood ? MPa maximum tensile stress in steel ? MPa maximum compressive stress in wood ? MPa maximum compressive stress in steel ? MPaarrow_forwardThe composite area shown in the figure below is composed of two rectangles. use b = 4.78 m., h = 4.6 m., and t = 1.01 m. Determine the radius of gyration about the indicated x-axis. Hint: Radius of gyration is the square root of the quotient of the moment of inertia and the area. Correct answer is 2.035. Show solution.arrow_forwardIt is common to assume that reinforced concrete has a unit weight of 150 lb/ft3. If plain concrete has a unit weight of 145 lb/ft3, what percent of the volume of reinforced concrete is assumed to be reinforcing steel?arrow_forward
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