Problem 3 3, Nine 4 "diameter steel (Est = 30,000ksi) reinforcing bars were used when the short concrete (Ec = 4500ksi) pier was constructed. After a load P of 150 kip was applied to the pier, the temperature increased 100°F. The coefficients of the thermal expansion for steel and concrete are 6.6 x 10-6/ °F and 6.0x 10-6/ °F, respectively. Determine: (1) The normal stresses in the concrete and in the steel bars after the temperature increases (2) The change in length of the pier resulting from the combine effects of the temperature change and the load. (3) Can we change steel bar to aluminum bar (12.5 × 10-6/ °F) to reduce the cost of reinforcement? Use one sentence to explain your thoughts, no need to calculateⒸ 10 in. O C 10 in. P = 150 kip Rigid cap 24 in.

Problem 3 3, Nine 4 "diameter steel (Est = 30,000ksi) reinforcing bars were used when the short concrete (Ec = 4500ksi) pier was constructed. After a load P of 150 kip was applied to the pier, the temperature increased 100°F. The coefficients of the thermal expansion for steel and concrete are 6.6 x 10-6/ °F and 6.0x 10-6/ °F, respectively. Determine: (1) The normal stresses in the concrete and in the steel bars after the temperature increases (2) The change in length of the pier resulting from the combine effects of the temperature change and the load. (3) Can we change steel bar to aluminum bar (12.5 × 10-6/ °F) to reduce the cost of reinforcement? Use one sentence to explain your thoughts, no need to calculateⒸ 10 in. O C 10 in. P = 150 kip Rigid cap 24 in.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

The plan of a reinforced concrete column section, and the distribution of strains at the ultimate limit stage are shown below. The concrete is M20 grade and the steel of Fe 250 grade. Also sketched below, for convenience, are the concrete compression stress block and the design stress-
1.) A STEEL WIRE 30 ft LONG HANGING VERTICALLY SUPPORTS A LOAD OF 500 lb. 30 ft NEGLECTING THE WEIGHT OF THE WIRE, DTERMINE THE REQURIED 500 Ib DIAMATER IF THE STRESS IS NOT TO EXCEED 20 ksi AND THE TOTAL ELONGATION IS NOT TO EXCEED 0.20 in. ASSUME E = 29 x 106 psi.
The wood pole is supported by two cables of 11 mm diameter. The turnbuckles in the cables are tightened until the stress in the cables reaches 161 MPa. If the working compressive stress for wood is 17 MPa, determine the smallest permissible diameter of the pole in millimeters. 60° 60°
A 2024-T4 aluminum tube with an outside diameter of 2.4 in. will be used to support a 30-kip load. If the axial stress in the member must be limited to 17.5 ksi, determine the wall thickness required for the tube.
2. A reinforced concrete beam having a width of 280 mm and a total depth of 600 mm is reinforced for tension at the bottom with 6 - 36 mmɸ bars placed on two layers, 4 bars on first layer and 2 bars on second layer. Compute the effective depth of the beam and the clear horizontal spacing between bars.
A reinforced concrete beam is shown in the figure below. 0.75-in, diameter rods Wo 20 in. 2.5 in. 8 ft- 8 ft 10 in. Part A Determine the maximum uniform distributed load wn that can be supported by the reinforced concrete beam if the allowable tensile stress for the steel is (Ost )allow = 30 ksi and the allowable compressive stress for the concrete is (oconc )allow = 3 ksi . Assume the concrete cannot support a tensile stress. Take Est = 29(10) ksi , Econe = 3.6(103) ksi Express your answer to three significant figures.
Q.2- Answer with true and false, and correct false statements. 1- Loading time of concrete starts from the first contact between water and aggregate. 2- Time of formwork striking increases with increasing of ambient temperature but it decreases with increasing of active space of concrete slab. 3- Concrete quantity measured by weight of hardened concrete. 4- Minimum concrete cover thickness depends on diameter of reinforcement bars only. 5-Columns capital and drop panels must be placed with columns monolithically.
calculate the corresponding depth uniform stress block in a reinforce concrete beam 42*10 deep reinforce with bars 20-mm in a diameter enclosed with 10-mm dia stirrups when the tensile steel strain is 0.008 and concrete compression strain 0.003. f'c = 22 Mpa. Express your anser in 2 decimal places only in mm.
Problem 2 The steel water pipe has an inner radius of 6 in and wall thickness 0.25 in. (1) If the valve A is open and the flowing water is under a gauge pressure of 240 psi. Determine the longitudinal and hoop stress developed in the all of the pipe. (2) If the valve A is closed. Determine the longitudinal and hoop stress developed in the all of the pipe.
The gas storage tank is fabricated by bolting together two half cylindrical thin shells and two hemispherical shells as shown. The tank is designed to withstand a pressure of 2.1 MPa. The tank and the 25-mm-diameter bolts are made from material having an allowable normal stress of 150 MPa and 250 MPa, respectively. The tank has an inner diameter of 4 m. Part A Determine the required minimum thickness of the cylindrical shell. Express your answer to three significant figures and include the appropriate units. ANSWER: tc = Part B Determine the required minimum thickness of the hemispherical shell. Q Tap image to zoom Express your answer to three significant figures and include the appropriate units. ANSWER: th =
A prestressed concrete beam of rectangular section 300mm wide and 600mm deep is prestressed by 5 pieces of 8mm high tensile wires at 500mm from the top and 15 pieces of 8mm diameter high tensile wires at 83 mm from the bottom. The initial stress in the wires is 1200 MPa. Estimate the loss of stress in the bottom wires due to elastic shortening of concrete. Assume modular ratio = 6.
Adosed cylindrical tank containinga pressurized fluid has an inside diameter of 472 mm and a wall thickness of 10 mm. The tank is pressurized to 240 MPa. Determine the absolute maximum shear stress on the inner surface of the cylinder wall. 40.2 MPa O 295 MPa 35.0 MPa O 272 MPa O 20.9 MPa