A 6-m span simply supported beam carries a uniformly distributed ultimate load of 70 kN/m. The dimensions of the beam section are b = 300 mm, d = 700 mm. The beam is reinforced with bars of 25-mm diameter in one row. f’c = 25 MPa, and Fy = 420 MPa. Use # 10 U-shaped stirrups. Neglect the column width. The stirrup spacings (s) is equal to:
| a. |
450 mm |
|
| b. |
350 mm |
|
| c. |
400 mm |
|
| d. |
500 mm |
In: Civil Engineering
. In what way the deflection affects the strength and stability of the steel structure?. Elaborate the limit states that controls the deflection. As a civil engineer specify the standard codal provision for deflection limits?
In: Civil Engineering
Discuss the result of the design of fillet weld for a tie member of a truss consist of an angle section ISA 100 x 75 x 8 mm of Fe410 grade, is welded to an 8 mm gusset plate. Design a weld to transmit a load equal to the full strength of the member. Assume shop welding. If the gusset plates are connected by 2 angle section ISA 65 x 65 x 6 mm back to back to the same gusset plate. Design a weld to transmit a load equal to the full strength of the member. Express your opinion on how the length of the weld are different for both the design form your results.
In: Civil Engineering
Discuss in detail the causes of twisting moment due to eccentric loading in bolted connection (include sketch). Explain the various approach in the design of moment resistance connection. As a civil engineer conclude the best approach of design?
In: Civil Engineering
Give short answers to the following: (a) (i) Write the equation for Mohr-Coulomb shear failure criteria for soils. Define the variables in the equation. Also, show how this equation is represented in a graph. Label your graph. (ii) Name two laboratory tests to determine the shear strength of the soils. (b) The soil below a concrete dam has a porosity of 0.4 and density of solids of 2.7 gm/cm3 . To ensure safety against piping, the specifications state that the critical gradient which cause piping should be 6 times the exit gradient. What is the allowable exit gradient?(c) In calculation of consolidation settlement we assume that the consolidation is onedimensional (in vertical direction only). Is this a reasonable assumption? Why? (d) Why the permeability of sand increases with the increase in grain size of the sand? (e) What are the advantages and disadvantages of a triaxial compression test? (f) Unconfined compression test was conducted on a saturated clay. The vertical stress at failure was 200 kN/m2 . Sketch (not to scale) the Mohr circle and find the shear strength parameters for this soil.
GEOTECHNICAL COURCE
In: Civil Engineering
a.For a single severe rainfall event, what are the four components or fates at the start of the hydrologic cycle? Which two capture the most rain or snow at the early stages of the event, and what happens to it?
b. A storm td = 2 hrs. Rain intensity is steady i = 1.0”/hr. The infiltration rate quickly stabilizes at f= 0.25”/hr. How many inches infiltrate over 2 hours?
c. List the benefits of directing roof runoff to an infiltration bed, and also, the risks. Why would a surface infiltration bed probably perform longer than an underground one?
In: Civil Engineering
Select the lightest W12 for the conditions described, using Fy = 50 ksi and Fu = 65ksi. Show calculations to select trial sizes and check for Gross Section Yielding and Tensile Rupture. Assume the member is to have two lines of 7/8" bolts in each flange. use LRFD method PD= 225 PL=150 Length= 28'
In: Civil Engineering
Select four (4) large projects (local or international) and carry
out the following:
i. Suggest the most suitable (unique for each one) forms of
contract for them.
ii. Provide a brief description for why each of the form of
contracts is suitable for
the projects.
iii. Describe one (1) advantage for using each of the form of
contracts for the projects.
iv. Describe one (1) disadvantage for using each of the form of
contracts for the
projects.
In: Civil Engineering
Hong Kong was ranked the second most sustainable city in Asia
after Singapore according to Arcadis’
Sustainable Cities Index (SCI) in 2018. Hong Kong obtained top
marks in economic aspects but trailed
in some other important parameters. A green group recently warned
that the Hong Kong government
might fail to reach the previously promised environmental goals,
particularly waste reduction. The
Hong Kong government definitely needs to take more actions to
enhance the overall sustainability in
a more balanced manner.
What are the three systems of sustainable development and what
characteristics a sustainable
solution needs to hold?
In: Civil Engineering
Hong Kong was ranked the second most sustainable city in Asia
after Singapore according to Arcadis’
Sustainable Cities Index (SCI) in 2018. Hong Kong obtained top
marks in economic aspects but trailed
in some other important parameters. A green group recently warned
that the Hong Kong government
might fail to reach the previously promised environmental goals,
particularly waste reduction. The
Hong Kong government definitely needs to take more actions to
enhance the overall sustainability in
a more balanced manner.
To reach a more balanced sustainable development, roles of what
major groups need to be
specially strengthened, and what means of implementation need to be
adopted in particular?
Please list at least TWO (2) major groups whose roles need to be
strengthened, AND at least
TWO (2) means of implementation that need to be adopted, with
specific illustrations.
In: Civil Engineering
Engineer Johnson was employed to inspect an aged vacant building
and prepare a report on its
structural condition before sale. He found some structural defects
which, if not repaired, might lead
to collapse of the building. He then advised his client to carry
out the necessary repair works
immediately. The client ignored the advice. In an email to Engineer
Johnson, the client wrote,
“…… I pay for your service. The content of the report is my
privileged information. You should
not reveal it to anyone without my consent……”. A week later,
Engineer Johnson saw an
advertisement in the newspaper that the building had been put up
for sale.
Engineer Johnson’s responsibilities to the relevant stakeholders
conflicted with one another.
Identity the responsibilities and explain the conflict.
In: Civil Engineering
The ETHICS PLUS decision making process developed by the
Independent Commission Against
Corruption is a useful tool for resolving ethical issues. Explain
the PLUS standards for evaluating
the alternatives identified in the process.
In: Civil Engineering
4 Q5 Total
Marks
8 Marks
8 Marks
8 Marks
8 Marks
8 Marks 40 Marks
Q1: A cantilever beam having span ‘L’ m was subjected to a
uniformly distributed load of magnitude 8 kN/m for a distance of
‘0.6 L’ from the free end and two concentrated loads one of
magnitude 15 kN at a distance ‘0.25 L’ m from the free end while
the other of magnitude ‘22’ kN at a distance ‘0.6 L’ m from the
free end respectively. It was observed that the maximum bending
moment acting on the beam is equal to (-369 kNm). Suggest a
suitable span for the beam based on the loading condition. How it
will change the reaction at the fixed support? What happens to the
shear force and bending moment values at the fixed support, free
end and at the center of the beam? By plotting bending moment and
shear force diagram for the beam briefly conclude the relationship
between the values for shear force and bending moment.
In: Civil Engineering
A single lane road is designed for a speed of 75kmph having a two-way traffic with radius of 350m. Determine the following (use different reaction time for question i, ii & iii).
Stopping Sight Distance for plain road.
Stopping Sight Distance for ascending and descending
gradient of 1/75.
Overtaking sight distance. (take interpolated value
for ‘a’)
Sketch of maximum overtaking zone distance and sign
posts.
Setback distance for SSD (only plain road) and OSD for
curve length of 150m and d=2m using above obtained values and also
perform checks.
In: Civil Engineering
a)Use SBC 304 to design a simply supported rectangular RC beam with tension reinforcement only to carry a service dead load of 18 kN/m (excluding beam’s self-weight) and service live load of 6 kN/m. The span of the beam is 7.5 m. Design data:Compressive strength of concrete, ?’?=25MPaYield strength of reinforcing steel, ??=420MPaConcrete cover 50mmSize of stirrups 10 mmSize of main reinforcement20mmMaximum size of aggregate 20 mm
b)What is the maximum uniform live load (in kN/m) that the beam designed in part (a) can carry according to SBC 304?
In: Civil Engineering