Calculate the static active earth pressure and seismic-induced earth pressure increase for a concrete retaining wall with the back-wall angle β of 10^o with the following given conditions:

1. Wall height: 8 m.
2. Backfill density: 1.8 g/cm³.
3. Backfill angle of internal friction: 36^o.
4. Concrete wall back and backfill interface friction angle δ: 22^o.
5. The wall is located at a seismic zone with design seismic coefficients: k_v=0.12 (vertical direction) and k_h= 0.36 (horizontal direction).
6. The soil below wall base is strong enough to fulfill bearing capacity requirement.

A new development is being planned, which will connect to the city ’s sanitary sewer system. This development will have 80 acres of medium-density residential assume 10 DU / acre and 2.8 persons per DU). Assume a per capita sewage rate of 90 gal/d/person. Additionally, a new community hospital will be constructed with 300 beds (assume 300 gal/d/bed). Assume I/I contribution of 10%.

a. Calculate the mean sewer discharge (accounting for residential, commercial, and I/I flows).

b. Calculate the maximum sewer discharge. Assume a peaking factor of 3.0

c. The new sanitary sewer pipe is to be laid at a slope of 0.003 ft/ft and built with pre -cast concrete pipe (n = 0.013). C ity code requires that the pipe can transmit the peak flo w at 75% full, with a velocity between 1.5 and 10 ft/s. What diameter pipe would you use?

d. How full, in inches, will the pipe be under normal conditions (mean discharge)?

1- State clearly the objectives of designing excel spreadsheet for retaining wall.             

Convert the following 24-hour PA person trip matrix to OD vehicle trip matrix. Assume the average vehicle occupancy is 1.2 people per vehicle. What is the number of vehicle trips from zone 3 to zone 1? (round to integer)

Table 1 24-hour PA Person Trip Matrix

Compute and tabulate the values for the ∆, T, E, M, LC, Station of the PC and Station of the PT for the following highway curves: 3. Radius of 1650’ and a length of 635.44’, PI = STA 16+20.00’

Include Diagram

A flow of 2.0 m3 /s is carried in a rectangular channel of 1.8 m width at a depth of 1.0 m (section 1). There is an upward step of 0.18 m together with a contraction where b reduces to 1.4 m (section 2).

a) Draw the side view and top view of the channel described above.

b) Calculate the specific energy at section 1 and plot the specific energy curve. Show y1, E1, V1 2 /2g on the curve.

c) Find the water depth on the step (i.e. y2) and check the choking condition (i.e. state if choking occurs).

d) If choking occurs what is the necessary change in specific energy and depth at section 1 to overcome choking?

Calculate the pressure drop (ft of water) over a distance of 800 ft within a PVC pipe carrying 750 ft3/min of landfill gas at 115 ºF. The cross-sectional area of the pipe interior is 0.0884 ft2 (d = 4.026 in). Assume the pressure in the pipeline is close to atmospheric (13.6 lb/in2) and the molecular weight of the gas is 28 lb/mol. Assume the gas is incompressible and the viscosity at 115 º is 7.65×10^-6lb/ft·s. The pipe relative roughnessis 1.5x10-5. Use the Moody diagram

Discuss the actual bar diameter with their rib area results and explain the relevance, confidence or risks ir portends to design reinforced concrete concrete structures in bending in terms of tension area and interfacial bonding between steel bars and concrete. what are the relevant standards on this?

Prove that the temporary storage in a reservoir routing is given by the area between the inflow and outflow hydrographs. For triangular inflow and outflow hydrographs, derive a relationship for the detention storage as a function of inflow and outflow peak discharges and the base time of the inflow hydrograph.

a) Discuss the economic, aesthetic & structural importance of a flat plate slab.
b. Discuss the structural performance of a flat panel slab based on
-load increment
-span increment
-depth increment
-edge conditions
C. Discuss the conclusion & recommendations of a flat plate slab on the building industry of Botswana

Discuss the same question, a, b & c for a one way slab.

please write for me an INTRODUCTION ( in detail ) about Sieve Analysis of Aggregates .

Please use Computer Font.

Briefly elaborate on the concepts given below, each in maximum 300 words. There is no need to
include figures. Plagiarism checker is active.
Response spectrum analysis
Response history analysis
Modal analysis
Artificial earthquake records
Effect of “building irregularities” on seismic design

1. The ultimate BOD of a river just below a sewage outfall is 55.0 mg/L, and the DO is at a saturation value of 12.0 mg/L. The deoxygenation rate coefficient kd is 0.30/day, and the reaction rate coefficient kr is 0.90/day. The river is flowing at the speed if 52.0 miles per day. The only source of BOD on this river is this single outfall.

   1. Find the critical distance downstream at which DO is a minimum.

   2. Find the minimum DO.

   3. If a wastewater treatment plant is to be built, what fraction of the BOD would have

      to be removed from the sewage to assure a minimum of 5.0 mg/L everywhere

      downstream?

Provide a discussion on each of the following topics. When necessary, define the term, explain the term, discuss the purpose and use, and provide sample calculations.

[1] Live load and its variation with tributary area [Tributary Reduction Factor] for a column in a multi-story building.

[2] Design Principles for Structures, and the philosophies behind “Limit States Design”.