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A simply supported compression member consists of a standard structural steel cross-section. Because of the lower bending stiffness in one plane compared to the other for most standard cross-sections, such a member would tend to fail by buckling in the weaker direction. One strategy of raising the buckling load is to constrain the lateral motion at the center of the member-the beam then has a buckling load that corresponds to a member that is half as long. Say that the lateral motion is constrained only in the weaker direction. Consider how much this strategy raises the buckling load for two cross-sections:
(a) a wide-flange section W6 x 25 and
(b) a standard channel section C9 x 15. For each section, compute the ratio of the constrained buckling load to the unconstrained buckling load. Also, for each section, specify whether the plane of buckling changes when the constraint is added. (See Appendix E.)
Assuming you have a roadway with 5 million traffic ESALS, and a Nominal Maximum Aggregate Size of 12.5mm, determine the requirements for:
An engineering student is driving on a level roadway and sees a construction sign 500 ft ahead in the middle of the roadway. the student strikes the sign at a speed of 25 mi/h.
The schedule can be developed either by hand or using scheduling software (Microsoft Project, Primavera SureTrak, etc.), just as long as the Activity Data Sheet is completed. (Hint: Project and Suretrak will automatically create a network diagram ..
A 301 stainless steel wire is suspended vertically from itsend. The wire is 400 ft long, diameter .75 inches, specific weight= 489 lb/ cubic foot.
You are a construction engineer working on a large concrete foundation project, involving the placement of over 500,000 c.y of concrete. The construction site is adjacent to a salt-water source (bay) & it is decided to set up a concrete batch plant o..
The line is standard commercial steel pipe 75mm internal diameter. From the column to the pump inlet, the line is 25m long and contains 6 standard elbows and a fully open gate valve.
a horizontal curve on a single-lane highway has its PC at station 124 + 10 and its PI at station 131 + 40. The curve has a superelvation of 0.06 ft/ft and is designed for 70 mi/h. What is the station of the PT?
Calculate the the oritical oxygen demand (mg/L) of a solution containing 450 mg of glucose(C6H12O6) in 2 liters of distilled water.
It is known that the velocity distribution for steady, laminar flowin circular tubes (either horizontal od vertical) isparabolic. Consider a 10 -mm- diameter horizontal tubethrough with ethyl alcohol is flowing with a steady mean velocity.15 m/s.
An object is submerged in a water tank and tethered by a line to the bottom of the tank. If the object has a density of 45 kg/cubic meter and a volume of 2.5 cubic meters, what is the tension in the line
A drinking water system treats a flow of 3000 gallons per minute. Consider disinfection of a bacteria by ozone with an inactivation constant of K=0.06/min. To reduce the number of bacteria from 400 bact/ml to 4 bact/ml.
Create a depreciation schedule showing annual depreciation amounts and end-of-year book values for a $26,000 asset with a 5 year service life, using the MACRS depreciation method.
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