A rectangular concrete beam has dimensions b=16 in. and h=30 in. The location of the Gr. 60 reinforcing bars, which are placed a
ll in one row in the bottom of the section, is d=27 in. Using a specified compressive strength of concrete of 5,000 psi and the assumptions and simplifications of the ACI 318-14 Code, find the nominal flexural strength Mn for positive bending if the reinforcing bars are: a. Three No. 9 bars b. Four No. 9 bars c. Three No. 8 + two No. 10 bars d. None (i.e., the beam is unreinforced)
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Answer:
The answer is ""
Explanation:
Given data:
Initial temperature of tank
Initial pressure of tank
Diameter of throat
Mach number at exit
In point a:
calculating the throat area:
Since, the Mach number at throat is approximately half the Mach number at exit.
Calculate the Mach number at throat.
Calculate the exit area using isentropic flow equation.
Here: is the specific heat ratio. Substitute the values in above equation.
exit diameter is 3.74 cm
In point b:
Calculate the temperature at throat.
Calculate the velocity at exit.
Here: R is the gas constant.
Calculate the density of air at inlet
Calculate the density of air at throat using isentropic flow equation.
Calculate the mass flow rate.