1.34 Estimate the tensile strength required to prevent cracking in a concrete-likematerial that is cast into a bar, 50 in. long, and is fully restrained at each endagainst axial movement. The concrete is initially cast and cured at a temperatureof 100°F and subsequently cools to a temperature of 0°F. Assume the modulus ofelasticity is 5 million psi and the thermal coefficient is 5 x 10-6 in./in./°F.

Answered: 34 Estimate the tensile strength…

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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If a new type of material that's a hybrid of plastic and wood shavings is brittle and has an ultimate compressive strength of 20 MPa, an elastic modulus of 1000 MPa, and a Poisson's ratio of 0.20, A. Calculate the bulk modulus for plastic wood. B. Calculate the maximum strain that can be put on plastic wood. C. Assuming that plastic wood is isotropic, calculate the maximum hydrostatic pressure that can be put on plastic wood. D. If the plastic wood has a fracture toughness of 0.2 MPa-m.5, calculate the maximum crack length if the stress on the plastic wood is 1 MPa.
A 3003-H14 aluminum alloy rod with 0.5 in. diameter is subjected to a 2000- lb tensile load. Calculate the resulting diameter of the rod. If the rod is sub- jected to a compressive load of 2000 lb, what will be the diameter of the rod? Assume that the modulus of elasticity is 10,000 ksi, Poisson’s ratio is 0.33, and the yield strength is 21 ksi.
The composite bar is subjected to a normal force P = 7500 lb as shown in the figure. The section of the composite bar is composed of two hollow tubes and a solid steel core. Determine the axial stress developed in each bar. Use Ecu = 18 x 106 psi, Est = 30 x 106 psi, and Ebr = 16 x 106 psi.
Concrete is required for a column that will be Severe exposed to freezing and thawing. The cross section of the column is 300 × 300 mm. The smallest spacing between reinforcing steel is 30 mm. The Required Average Compressive Strength of concrete at 28 days is 35 MPa with a slump of 80 to 100 mm. The properties of materials are as follows: ❖ Cement used is type I Portland cement with a specific gravity of 3.15. ◆ The available coarse aggregate has a maximum size of 23 mm, a dry-rodded unit weight of 1800 kg/m3, a bulk specific gravity (SSD) of 2.7, absorption capacity of 0.55%, and moisture content (SSD) of 0.25%. The fine aggregate has a bulk specific gravity (SSD) of 2.75, absorption capacity of 1.4%, a moisture content (SSD) of 2.5%, and a fineness modulus of 2.70. The aggregates conform to the ASTM C33-84 requirements for grading.
Concrete is required for a column that will be Severe Exposure to freezing and thawing. The cross section of the column is 300 × 300 mm. The smallest spacing between reinforcing steel is 40 mm. The specified compressive strength of concrete at 28 days is 40 MPa with a slump of 25 to 50 mm. The properties of materials are as follows: (a) Cement used is type I Portland cement with a specific gravity of 3.10. (b) The available coarse aggregate has a maximum size of 23 mm, a dry-rodded unit weight of 1800 kg/m3, a bulk specific gravity (SSD) of 2.68, absorption capacity of 0.65%, and moisture content (SSD) of 0.27%. (c) The fine aggregate has a bulk specific gravity (SSD) of 2.75, absorption capacity of 1.5%, a moisture content (SSD) of 2.5%, and a fineness modulus of 2.7,The aggregates conform to the ASTM C33-84 requirements for grading.
STRAIN
Question: Determine the diameter of the elastic core of the rod ? Options: A. 13.72 mm B.10.34 mm C.11.57 mm D.12.95 mm A solid steel rod is 1.5 meters long and has a diameter of 20 mm. The steel rod is assume to be an elastoplastic material with G = 77 GPa and a yield shear stress of 145 MPa.
The solid circular drill rod AB is made of a steel that is assumed to be elastoplastic with τY = 22 ksi and G = 11.2 × 106 psi. Knowing that a torque T = 72 kip·in. is applied to the rod and then removed, determine the maximum residual shearing stress in the rod. The maximum residual shearing stress in the rod is ksi.
The concrete beam shown below is made of an all-lightweight concrete with a unit weight 7=/ 800 kg/ ni a. Compute the value of the cracking moment and b. Estimate the value of the concentrated load P at midspan that causes the beam to crack (include the dead weight of the beam). f, =27.5 MPa 100 mm P=? Wbeam 2-D25 - 5 m 100 mm 100 mm 300 mm

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