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Civil Engineering

Civil Engineering is a profession of designing and executing structural works that serve the general public, like houses, buildings, roads, etc. A Civil Engineer is an engineer trained in the design and construction of public works, such as bridges or dams, and other large facilities.

4,921 Questions

How is a stress strain curve obtained?

From the origin O to the point called proportional limit, the stress-strain curve is a straight line. After reaching the proportional limit, the curve shows less stress until it gets to the ultimate strength, where the stress decreases.

What advantages do Fastfoot footing forms offer?

The biggest advantage to the use of Fastfoot boards is that they are environmentally friendly, as far more lumber must be used to form concrete than an equivalent amount of Fastfoot. Additionally, Fastfoot prevents damage to additional equipment, adapts to uneven ground, and prevents water damage and contamination of concrete.

Can a civil engineer work as a production engineer?

A civil engineer can work as a production engineer with the proper training. Both use similar concepts, however each uses its own methods by which to apply known principles.

What are pros and cons of the bridge to Canada?

To Canada from where? From Vancouver Island? All the same pro's for the bridge to PEI plus another 600,000 more (Vancouver Island has more than 600,000 more people).

Another or replacement of one of the many bridges to the USA? As part of our road and highway system those are paid for and are the responsibility of the Province. In which case the biggest con is the price. Unless it is located in Eastern Canada, then more federal money is available but then that just passes the con on to other Canadians.

To Greenland? If combined with bridges to Iceland, Faroe Islands, Ireland and England then the pro could be lower transportation costs and a huge advance in engineering but at great cost.

Generally, the pro is increased transportation the con is price. Of course if you do not have to pay for it then price is no object.

What is the formula for section modulus of unequal angle iron?

(Assumes the angle iron isn't constrained on either side.)
Where:
w = width (parallel to axis)
h = height (perpendicular to axis)
t = thickness
x = Distance to farthest fiber = h-(t*(2*(h-t)+w) + (h-t)^2 / (2*(w+h-t)))



Section Modulus = Moment of Inertia / x
Section Modulus = (t*x^3 + w*(h-x)^3 - (w-t)*(h-x-t)^3)/ 3

/ x

Hope that helps

How do you increase grade of existing concrete?

In basic terms, you can not.

you can strengthen a reinforced concrete beam by application of a steel plate/frp up to a point where the area in the stress block under compression is at a max. allowable limit as stated in the code you are using. At this stage, the concrete is close to a crushing instantaneous failure and the beam can not be strengthened further.

Are beam bridges safe?

Yes!

All type of bridges are safe, provided they are designed and executed properly.

There are many factors that decide the type of a proposed bridge. It could be the span of bridge, depth of river, asthetics, budget restrictions, availability of materials, etc.

What will happen to the concrete mix if the amount of aggregate used is large?

From a recent science test I completed shows small doses of aggregate seem to strengthen the mixture, but as more is added, it becomes worse than with none at all.

Did o zone is effective than chlorine for purification oFwater?

Ozone (O3) leave no additional additives in the treated water while chlorine (case NaOCl) will have additional sodium in to the water. For safety control, chlorine systems either NaOCl or direct diffuse of Cl2 involve handling of highly hazardous material while ozone was produced from oxygen in air thus Ozone also rules out in term of safety.

However, in term of lasting disinfection, ozone will revert to oxygen in short time. Ozone treated water may had microbial re-contaminated in shorter period than chlorine treated. For ease of water treatment, ozone require electricity supply and in practical case of Thailand over 2011 flood, chlorine disinfection is a practical use in the flooded area because it could transport small quantity of substance into the flood site with power cut and made simple household treatment for cleaning water from flood water.

Is plain rebar is banned?

Not to my knowledge. It typically is not used. Instead, deformed bar, bar with ribbing, is utilized for better surface area in which to bond with the concrete in which it is placed.

How do you calculate required cement bag for 100sqft wall plastering soft?

First assume the ratio of plaster is 1:4 (1 cement and 4 sand)

now we have to plaster the wall having area of 100 sft assume the thickness of plaster 0.5 inches.

first convert thickness in to feet so 0.5/12 = 0.0416

now to calculate the material use in cft so 100 sft x 0.0416 = 4.16 cft

so we required 4.16 cft material to complete the plaster multiply it by dry factor 1.5

4.16 x 1.5 = 6.24 cft

to calculate cement 6.24/(1+4) = 1.24 cft

1 cement bag volume 1.25 cft so calculate no of bags 1.24/1.25 = 1 bag

to calculate sand

(6.24/(1+4)) x 4 = 4.99 cft

What advantage and disadvantage exists with the use of semi-rigid rods as penile implants?

Once implanted, the semi-rigid device needs no follow-up adjustments; however, it produces a penis that constantly remains semi-erect.

What is strength of civil engineer?

An ambitious and dedicated civil engineer with strong practical technical skills and a range of experience within construction engineering and project management. Having a sound knowledge of designing, testing, evaluating a designs overall effectiveness, cost, reliability, and safety.

How do they make ship driveshafts that run from engine to propeller waterproof when they exit the inside of the ship and enter the water?

at least in small scale, the propeller shaft is run through a tube almost the same size as the shaft but filled with a water proof grease and held in the tube by a cap at the end, (much like a hydraulic piston, it can travel through it but doesn't leak fluid) there are also water tight bearings that the shaft can be ran through. i cant imagine large scale would be much different

What is the procedure for fatigue testing of asphalt mixes?

Bending or flexural tests are the most widely used methods for assessing the fatigue resistance of asphaltic materials. Four point bending is included in both CEN and AASHTO specifications. The specimen is a prismatic beam, which is subjected to sinusoidal loading in the controlled strain mode. In Europe the principal alternative is two-point bending using trapezoidal specimens, a test which was developed at LCPC in France.

Cooper Technology manufactures several machines for asphalt fatigue testing like Servo-Pneumatic Universal Testing Machine, Gyratory Compactor, Servo-Hydraulic Universal Testing Machine, Stand Alone Four Point Bending Machine, European Standard Roller Compactors - Steel Roller, European Large Roller Compactor.

Is there any growth in aqueduct city ca?

No, quite the opposite. The boom in California city has turned to bust, and the land has gone back to what it always was; empty desert. Few jobs in the area, and other places to live close by that are not only nicer, but more convenient to reach, with services.

What is the meaning of ppc cement?

Portland Pozzolana cement (PPC) is manufactured by a combination of pozzolanic materials. Pozzolana is an artificial or natural material that has silica in it in a reactive form. Along with pozzolanic materials in specific proportions, PPC also contains OPC clinker and gypsum. These pozzolanic materials include volcanic ash, calcined clay or silica fumes, and fly ash which makes around 15% to 35% of cement weight. To know more visit Banshiwala Cement- Leading Cement Company in Rajasthan India

How eccentric loads effect the design of columns?

incolumns with no eccentricty the entire section is subject to axial load only and the entire section is considered to be in compresion while the eccentric loading of the column results in a moment of the magnitude ( M=ep ) where e:is the eccentricity and P is the axial load acting on the column and so the section will be subjected to both tension and compression

Is ultimate flexural strength and moment of resistance the same in a reinforced section?

No the moment of resistance is a defining parameter that can be used to calculate the stress in a cross section of a given material that is subject to flexural loading. The ultimate flexural strength is a numerical value of stress at which the material will crack, tear, rip etc. Think about ultimate tensile strength and the value of Young's Modulus. Young's Modulus is not defined at the point of 'necking' and therefore the ultimate tensile strength cannot be computed from Young's Modulus and Hook's Law, but the UTS is an empirically defined value.

What year did people stop using aqueducts?

That will be sometime in the very distant future.

Some of the largest are still in use in the United States, supplying water to New York City and Los Angeles.

Relationship between bulk modulus and poissons ratio?

K=E/(3*(1-2v))

K: Bulk modulus

E: young modulus

v: poison's ratio

on the other hand:

delta V/V=(1-2v)*delta L/L

relative change in Volume equals to: (1-2v) * relative change in length.

Can you fix the pitch on a concrete patio if its to much?

If it is a free floating slab, not tied to the house, you could probably have it mud jacked on the low side depending on what is beside it,