A Portland Cement Concrete (rigid) pavement is to be designed using AASHTO empirical design method. The pavement should have an 8" granular sub-base having elastic modulus (E_sb) of 50x10³ psi. The resilient modulus of the subgrade is 5000 psi, and lying just 5 feet above rock strata (bed rock).

(a) Determine the design k value, assuming loss of support factor (LSF) of 2.

(b) Use the k value obtained from (a) to determine the thickness of the rigid pavement.  

Assume concrete elastic modulus (E_c) = 5 x 10⁶ psi , Modulus of rupture (Sc) = 650 psi, load transfer factor J = 3.2, drainage coefficient C_d = 1.0, present serviceability loss ∆PSI = 4.2 — 2.5 = 1.7, reliability R = 95%, standard deviation S_o = 0.29, and total ESAL W₁₈ = 5.1 x 10⁶.

The vulnerability of soil types to a mechanical stress process (same intensity and magnitude) is different. Explain why.

Determine the location of the shear centre of the C-shaped rolled-steel beam cross-section C150x19.3 with respect to the centre of the web. Indicate whether it is to the left or right of the centre of the web. Assume the section to be thin walled and neglect the rounding of corners.

Sedimentation basins are employed both in filter plants for drinking water treatment and in municipal wastewater treatment plants. Briefly explain what solids are removed in each of these sedimentation basins.

A vertical curve is designed for 90 km/h and has an initial grade of + 2.5% and a final grade of -1.0%. The PVT is at station 3 + 480. It is known that a point on the curve at station 3 + 440 is at elevation 75 m. What is the stationing and elevation of the PVC? What is the stationing and elevation of the high point on the curve?

An equal-tangent crest vertical curve is designed for 100 km/h. The initial grade is +3.4% and the final grade is negative. Draw the curve. What is the elevation difference between the PVC and the high point of the curve?

A vertical curve is designed for 75 km/h and has an initial grade of + 3.5% and a final grade of -2.0%. The PVT is at station 3 + 560. It is known that a point on the curve at station 3 + 520 is at elevation 85 m. What is the stationing and elevation of the PVC? What is the stationing and elevation of the high point on the curve?

i would really appreciated if answer this question quickly thank you all !

A vertical curve is designed for 75 km/h and has an initial grade of + 3.5% and a final grade of -2.0%. The PVT is at station 3 + 560. It is known that a point on the curve at station 3 + 520 is at elevation 85 m. What is the stationing and elevation of the PVC? What is the stationing and elevation of the high point on the curve?

Think back to all of the ways we have learned to analyze structures by hand in this class. Now recall the SAP2000 assignments and any other software program we may have used (excel, maybe Mathcad or MatLab). Using at least 10 sentences, discuss how technology is making it easier and making it harder to complete structural analysis tasks. In what way does technology present new challenges? What are some of the advantages and disadvantages?

1. a) If you were a consulting engineer and were submitting Turnkey tender on behalf of a Turnkey Contractor, would you consider a conflict of interest between the role of a consulting engineer and contractor? Enlarge on the ethics of this subject. b) It is clear to you that an Engineer engaged in a particular project (implement at the taxpayer’s account) is not maintaining professional standards, i.e. professional competence and integrity are lacking. What would be your reaction? Will you report the above incident to the Board of Engineers, Malaysia or bring this to the attention of the client, or will you maintain silence and watch substandard work being completed? c) “Professional Engineer should be allowed to practice as consultants and as a contractor at the same time”. Do you agree with this statement? If so, give your reason objectively for supporting it; if not also give reasons for appeasing it.

The answer shall be about 1500 words.

Using the AASHTO 1993 Flexible Pavement Design Procedure, design a pavement cross section that will provide 10 years service. The initial PSI is 4.2 and the final PSI is determined to be 2.5. The subgrade has a soil resilient modulus of 18,000 psi. Reliability is 95% with an overall standard deviation of 0.4. For design, the daily truck traffic consists of 400 passes of trucks with two single axles and 350 passes of semitrailer truck with tandem axles. The axle weights are:

Single-Unit truck                    =          8000-lb steering, single axle

                                                =          22,000-lb drive, single axle

Semiunit truck                        =          10,000-lb steering, single axle

                                                =          16,000-lb drive, tandem axle

                                                =          34,000-lbs trailer, tandem axle

M₂ and M₃ are equal to 1.0 for the materials in the pavement structure.

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Explain the difference between fully plastic and elastic design

A 3.0% grade passing at station 19+85.00 at an elevation of 99.10 m meets a -2.0% grade passing at station 20+35.00 at an elevation of 99.60 m. Please note that these two elevations and stations DO NOT correspond to BVC and EVC.

Determine the station and elevation of the point of intersection of the two grades./

If the highest point on the curve must lie at station 20+40.00, find the elevation of this point and the
length of the curve that meets these conditions./

Calculate the station and elevation of the beginning of the vertical curve (BVC), and its end (EVC).

Layout this curve at 100 m stations.