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Presence of bridge piers across a stream causes constricted flow in the openings due to the decrease of width of stream owing to presence of the piers. Furthermore it creates the following problems from hydraulic point of view:
(i) Local scouring at the piers and bed erosion can take place. To avoid damage to the foundation of piers, a number of protective layers of stone or concrete apron could be provided around the piers.
(ii) The head loss induced by bridge piers causes the backwater effect so that water level upstream is increased. Thus this may result in flooding in upstream areas.
Estimate the Activity Durations The total labor cost for emergency bridge rehabilitation on an interstate highway is $5,716,440. The average crew-hour cost is $15,879 for this
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Determine the uses of Prestressed concrete poles Prestressed concrete poles are commonly mass produced and are used in most countries for power transmission, antenna masts etc
Given: pretensioned rectangular beam b=6" h=20" f'c=4000psi f'ci=3000psi fti=.165ksi fts=.38ksi fci=1.8ksi fcs=1.8ksi R=0.80 Required: (a)Pi and e to maximize Md+
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A sand at a borrow pit is determined to have an in-situ dry unit weight of 18.4 kN/m 3 . Laboratory tests indicate the maximum and minimum unit weight values of 19.6 kN/m 3 and
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