Results obtained from a tension test on a bar of uniform cross section 10 mm x 10 mm subjected to an axial pull of 8000 N were tabulated. The lateral dimensions of the bar were found to be changed to 9.9985 mm x 9.9985 mm while using a material having modulus of rigidity equal to 0.8 x 107 N/cm2. By determining the values for different moduli, identify the properties of material and establish the relationship between them. What changes will happen to the volume if the length of the bar is equal to 2.5 m? Based on the results obtained discuss how the elastic constants are related to the deformation of the bar?   

Scenario Question.

Omani company for investment ( OCI ), is one of the biggest business company in Oman, it has diverse varieties of investment, one of these businesses is an old tower building, 20 floors located in Seeb area used as offices by multiple companies.

OCI decided to change the purpose of the building to a residential building, so it started to plan to demolish the building through one of its construction company.

The location description of the building is located in a very crowded area, the main gate of the building opening to the main road in the North direction, East and West directions of the building attached to two buildings, the South direction of the building is next to a wadi. after the company communicated its plan to all governmental authorities, the municipality requested that the work should be finish in a very short time due to the nature of the area.

Task's questions:

1/ Identify which suitable technique of demolition that the company has to follow and why?

2/ Mention all the important precautions that should be taken by the demolition contractor.

3/ Discuss the method statement of the demolition operation.  

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Explain the concept of high-performance green building. Include the following:

• Your reasoning to justify the appropriateness of sustainable construction practices (a minimum of three reasons)
• A minimum of three trends in high-performance building
• A trend you foresee in high-performance building in the near and distant future

• What are the differences between AASHTO 1993 and Al method? what are the similarities?

THIS IS AN ENGINEERING SUSTAINABILITY SUBJECT BUT I CHOOSE CIVIL ENGINEERING

You are required to come up with a significant engineering solution to address a sustainability challenge in Western Australia. Some key sustainability issues in Western Australia that are challenging for engineers to address include but are not limited to: Carbon emissions (reduce GHG emissions)

Question

1. Provide a summary of any one of the following improvement strategies to help solve the TBL problems associated with your sustainability challenge: Use Energy storage.

Climate change causes profound impacts on the environment due to the increased global temperature. Discuss briefly why and how climate change can potentially cause more flooding and excessive rainfall in some areas, and severe droughts in others.

A municipal wellfield is designed to consist of five water-supply wells, each rated at 16 litre/s. The wells are located 100 m apart along a north-south line and fully penetrate a 20m thick confined aquifer that has a transmissivity of 1000m2/day. . Estimate the maximum drawdown 500m west of the centre well assuming that all wells are 40cm in diameter and the radius of influence of each well is 800m. [15 Marks] 4b. If the calculated drawdown value is considered too low, propose 3 design options to ensure an increased drawdown.

Compute the settling velocity for the following particles: very coarse sand ( diameter = 1.5 mm ) , (diameter=1.5 mm), medium sand (0.4 mm), very fine sand (0.075 mm), and clay (0.001 mm). Estimate the time for each particle to fall 6 in. in water.

Assume: SG: coarse sand = 2.65, medium sand = 2.67, fine sand = 2.70, clay = 2.8 & water temperature = 60°F

Note:The other solution on chegg is wrong.

Using the regime-theory method, design a channel to carry wastewater from a manufacturing plant. Assume a design discharge of 950 ft3/s.950 ft3/s. The channel will have a sand bed and banks. Use a Manning’s roughness coefficient of 0.025.

Assume: Water Temp = 60°F, slope = 0.25%

▪ Describe the engineering aspects of two of MOSE Project and Thames Barrier
▪ Describe how fluid mechanics govern the design of these protection structures

A two-dimensional transient velocity field is given by

u = ax(b + ct)               v = ey(f+ ht)

where u is the x velocity component and v, the y component. Find:

1. The trajectory x(t), y(t) if x = x0, y = y0 at t = 0.
2. The streamline that passes through x0, y0 when t=0 and plot it.
3. The acceleration field.

a (-) = 5

b (1/s) = 5

c (m) = -1

e (-) = 5

f (1/s) = 5

h (m) = 4

x₀ = 1

y₀ = 2