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An equal-tangent vertical curve was designed in 2012 ( to 2011 AASHTO guidelines) for a design speed of 70 mph to connect grades G1=+1.2% and G2=-2.1%. The curve is to be redesigned for a 70 mph design speed in the year of 2025. Vehicle braking technology has advanced so that the recommended design deceleration rate is 25% greater that the 2011 value used to develop, but due to the higher percentage of older persons in the driving population, design reaction times have increased by 20%. Also, vehicles have become smaller so that the driver's eye height is assumed to be 3 ft above the pavement and the roadway objects are assumed to be 1 ft above the pavement surface. Compute the difference in design curve lenghts for the 2012 and 2025 designs.
The beam is subjected to a force F=825 lb in the direction, and is supported by a pin connection at point B and a rope attached through a pin connection at point A. Problem #1: Draw a complete FBD of the beam.
a job requires excavating and hauling 500 cyds (in situ) of sandy soil. in your posession is an excavator and a dump truck (capacity 30 cyds loose) the dump truck has a round trip travel time of 5 mins and 45 secs to the dump site and back.
H = h - N. At point A, the geoid correction is -100 feet; the ellipse height is 100'. What is the NAVD88 elevation of point A
The elevation of the lowest bottom of the structure is at 1470 feet. Calculate the maximum length (feet) of the parabolic curve required to meet the given conditions.
Write a paper on steel sustainability.
The long-term average January precipitation in the Colorado River basin is 1.11 inches, with a standard deviation of 0.60 inches. Assuming a normal distribution, what is the probability that less than 0.5 inches of precipitation will occur in any ..
Conduct either a qualitative or quantitative risk assessment on this project. Identify the risk factors that you consider most important for the suspension bridge construction. How would you assess the riskiness of the project? Why?
The block is acted by its weight W=200 lb, a horizontal force Q=600 lb, and the pressure P exerted by the inclined plane. The resultant R of these forces is up and parallel to the inclined thereby sliding the block up it. Determine P and R.
If 110 mg/L Alum (Al2(SO4)3 14H2O) is added to water containing a natural alkalinity of 20 mg/L as CaCO3, 1) how much lime (mg/L as CaO) must be added to react with the alum 2) How much precipitate (mg/L as Al(OH)3 ) is formed
Natural gas is stored in very large vessels consisting of a floating tank and a liquid seal. The pressure in the tank is constant because the weight of the floating tank is constant. In the morning, the temperature of the natural gas is 300 K.
Estimate the steady state PM10 concentration assuming a PM10 deposition velocity of 0.12 cm/s, prevailing wind velocity of 2.5 m/s, and a constant emission flux of PM10 0.82 mg/m2-s.
Your neighbor has the Bonda generator in the next problem and they have graciously extended a 100 foot extension cord to your home, which has a resistance of 0.0075 ohms per foot of wire (per lead). By how much is the delivered power reduced
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