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A pretentioned beam is to carry a superimposed dead load of 600 plf and service live load of 1,200 plf on a 55ft simple span. A symmetrical I-beam with b = 0.5h will be used. Flange thickness hf= 0.2h and web width bw=0.4. The member will be prestress using graded 270 strand. Time dependant losses are estimate at 20% of Pi. Normal density concrete will be used with f'c = 5000 psi and f'ci = 3000psi. Question
a) Using straight strands, find the require concrete dimension, prestressed force , and eccentricity. select an appropriate number and size of tendons, and show by a sketch their placement in the section.
B) revised the design of part (A) using tendon deflected at the third point of span, with eccentricity reduce to zero at the support.
C) comment on your results. in both cases, ACI stress limit are to be apply, you may assume that deflection are not critical, and that a tensile stress of 12*f'c^0.5 is permissible at full service loads.
A state legislator wishes to survey residents of her district tosee what proportion of the electorate is aware of her position on using state funds to pay for abortions. a)What sample size is necessary if the 95% Confident Interval
The force exerted by the potatoes on the frame at one side of the chair is equivalent to horizontal and vertical forces of 24 N and 84 N, respectively, at E and a force of 28 N perpendicular to member BH at G.
THe upper end of the spring is welded to the lunger and the lower end is welded to the base plate. If the plunger is lifted 1.5" above equilibrium and released from rest, calculate its velocity as it strikes A.
Saturated steam (at 20 bar) is used to heat up a toluene stream from 40oC, 1 bar to 150oC, 1 bar in a heat exchanger. The toluene stream is flowing at a rate of 100 kg/min. Steam leaves the heat exchanger as a saturated liquid at 20 bar.
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A four-wheel tractor whose operating weight is 47,877 lb is pulled up a road whose slope is +3.5% at a uniform speed. If the average tension in the towing cable is 4,860lb, what is the rolling resistance of the road?
Ocean water contains 0.9 ounce of gold per ton. Method A costs $220 per ton of water processed and will recover 85% of the metal. Method B costs $160 per ton of water processed and will recover e of the metal.
Compare the total reactor volume required for 90% removal of the same pollutant in a CSTR system that contains a single reactor against a system that contains three CSTR reactors of equal volume in series.
A 50 meter wide rectangular channel is carrying a flow of 250 m3/s at a flow depth of 5 meters. To produce critical flow in this channel, determine
A rectangular channel leading from an upstream lake has a bottom width of 20 ft, bottom slope of 0.0002, a Manning roughness factor of 0.016, a discharge of 403 cfs, and normal depth of 6.24 ft.
A sprinter runs using a force of 200 N and a power output of 600 W. Calculate how many minutes it takes for the runner to run 1 km.
A 75g , 30cm--long rod hangs vertically on a frictionless, horizontal axle passing through its center. A 12g ball of clay traveling horizontally at 2.5m/s hits and sticks to the very bottom tip of the rod.
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