Sectional bending moment due to counting load M_U = 525 kN
Find the amount of reinforcement required. The cover thickness is 40mm, and the stirrup rebar is D10.
Design. Compressed reinforcing bars do not have to be yielded, and the size of the section can only be increased if design is not possible under the given conditions.

b = 330 mm, h = 600 mm, f ck = 40 MPa, f y = 500 MPa, using tensile and compressed rebar D16

How Does the Ratio of Sand to Cement Affect the Strength of Concrete? Explain in details

The speeds of 80 vehicles were collected from a roadway section to estimate the mean speed. The margin of error for this sample mean was reported as 4 km/h at the confidence level of 90%. What is the sample size required to reduce this margin of error to 2 km/h (i.e., to ensure that the true mean is within ±2km/h of the sample mean 90% of the time)?

1.Answer the following questions.

a)A solid shaft transmits 75kW power at 200rpm.Determine the diameter of the shaft if the twist in the shaft is not exceeded 1⁰ in 1m length of the shaft, and shear stress is limited to 50N/mm^2.

Take rigidity modulus, G=100kN/mm^2

b)A hollow shaft with a diameter ratio of 0.7(internal outside) is required to transmit 500kW at 300 rpm with a uniform twisting moment. Allowable shear stress in the material is 70N/mm^2 and twist in a length of 2.5m is not to exceed 1⁰.Determine the maximum external diameter of the shaft satisfying these conditions. Take modulus of rigidity G= 80KN/mm^2

Design a set of activated sludge aeration tanks. The flow rate to treat is 5.6 MGD and the BOD concentration is 150 mg/L. The design solids concentration (X) at steady-state is 2,000 mg/l. The design MCRT is 7 days. The kinetic coefficients are as follows: K = 2 g BODg cells⋅d, Ks = 25 BOD/L, Kd = 0.06 day-1, Y = 0.5 g BODg cells⋅d. The influent ammonia concentration is 40 mg/l and nitrification is needed. It takes 1400 ft3of air per pound of BOD. Use rectangular tanks with a depth of 12 ft, a length to width ratio of 6 to 1, and a maximum length of 110 ft. Determine the following:

a) The hydraulic retention time (hr)

b) The steady-state effluent BOD concentration (mg/L)

c) The number of tanks and their lengths (ft) and widths (ft)

d) The air requirement (ft3/min)

Identify the emerging role of aircraft and parachutes in supporting and maintaining pressure or defensive efforts on certain fronts.

Find the depth and top width of a triangular notch capable of

discharging a maximum quantity of 700 lit/sec and such that the

head shall be 8 cm when the discharge is 6 lit/sec. The K for the

notch is the same as for a right angled notch, that has a value

of, K = 1.42.

Describe 2 advantages and 2 disadvantages for masonry building,reinforced concrete building and steel structural building,respectively

Describe the mainfeatures of civil engineering in history.
1)Ancienttimes
2)Recenttimes
3)Moderntimes

Explain the priorities of connections when we plan and design connections in urban areas.

Explain characteristics of “Perimeter blocks”

A simply supported flanged beam subjected to a factored load of 60 kN/m (including dead load and live load). The beam has an overall depth of 600 mm including slab thickness of 100 mm. The width of the beam is 230 mm, effective span of the beam is 6.25 m and effective cover to the tension reinforcement is 50 mm. Assume M25 grade concrete and Fe415 steel. Check whether the beam needs to be designed as singly reinforced or doubly reinforced

what are the Municipal solid waste management strategies?and industrial waste management strategies ?