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Problem: Determine the LRFD nominal and adjusted design values and adjusted design resistances for the following members and loading combinations. All members are Select Structural Southern Pine and are fully braced to prevent lateral torsional bucking.
Given:
a. Roof Joists are 2x6 at 24 inches on center which directly supports the roof sheathing. Loads are 1.2D+1.6S
b. A 4x12 that supports 1.2D+1.6L+0.5Lr with L from occupancy.
c. Purlins in a roof are 2x10 inches at 4ft on center. Loads are 1.2D+1.6Lr
d. Floor beams are 4x10 at 4ft on center. Loads are 1.2D+1.6W+L
The initial waste concentration is 200 mg/l and the following constants have been determined: Ks=50 mg/l; k=5.0 days^-1; kd=0.06 days^-1; Y=0.60 Determine the minimum mean cell residence time, the mean cell residence time you would set for design.
a 3200-lb car (Cd = 0.35, Af = 25ft^2, and p= 0.002378 slugs/ft^3) has 14-inch-radius wheels, a drivetrain efficiency of 93%, an overall gear reducation ratio of 3.2 to 1, and drive axle slippage of 3.5%. the engine develops a maximum torque of 21..
A rear-wheel-drive 3000lb drag race car has a 200-inch wheel base and a center of gravity 20 inches above the pavement and 140 inches behind the front axle. The owners wish to achieve an initial acceleration from rest of 15 ft/s on a level paved s..
A disinfection process for potable water treatment is described by first order kinetics with a rate constant of 0.08 minute. An ideal plug flow reactor is used with a hydraulic residence time of 1 hour. What is the expected efficiency of the syste..
The mass flow rate of steam into a steam turbine is 5 kg/s . The turbine has a heat loss of 5 kj/s. if the velocity of the refrigerant is to be limited to 2 m/s, what is the minumum allowable pipe diamter
Air enters a steady flow, adiabatic compressor at 17 °C and is compressed through a pressure ratio of 8.6: 1. Assuming the compressor to be internally reversible
You have been assigned to design a heat exchanger to cool a gaseous process stream in a chemical plant. The stream flow at 20 kg/s and enters at 431 oK, It has a heat capacity of 3.45 J/g-oC , and needs to be cooled to 402 oK.
A w14X74 of A992 Steel has a length of 20 feet and fixed ends. Compute the design compressive strength for LRFD and the allowable compressive strength for ASD.
For an intermediate beam in 3 bays by 3 bays (each bay is 20' by 20') floor plan, draw the envelope shear and moment diagrams taking into account effect of pattern loading.
Calculate the temperature increase which would induce maximum compression in the wall of the vessel equal to the maximum tension. young's modulus for steel can be taken as 200Gpa and the coefficient of thermal expansion as 12*10^-6mm(mm Celsius).
What are two types of variables that can be used for values that are less than 128, and describe what is the difference between the variables, how to declare them, and the memory allocated and the numerical range for both.
Soil has been compacted in an earth dam to a bulk density of 2.2 Mg/m3 and a water content of 9.5%. The value of Gs is 2.6. Would it be possible to compact the above soil at a water content of 13.5% to a dry density of 2.00 Mg/m3
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