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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
What year was the harbor bridge built?
On Saturday 19 March 1932, a large crowd gathered around Sydney's Harbour Bridge for the official opening ceremony.
What is the unit weight for rebar 14mm?
0.395 kgs = unit wt of 8 mm dia rebar There is another way of calculating the specific weight (or unit weight) of a rebar. Especially for those who are interested of rebars less than 10mm of dia. the way is to calculate it mathematically knowing that the density of steel rebars is 7851 Kg/m3. 8mm rebar ==>
Unit weight [Kg/m] = Cross-Sectional Area [m2] x Density [kg/m3]
= (Pi)x(radios)2 x 7851 kg/m3 = 0.395 Kg/m Good luck !!
What unique characteristics do beam bridges have?
Beam bridges are the most simple form of bridge construction.
They are essentially designed as simply supported beams. This is the equivalent of a ruler supported on a series of Lego bricks. the connection between the ruler and the Lego brick does not prevent the movement of the ruler what-so ever and as a result the only effect on the lego brick is the vertical force of the loads placed upon the bridge.
This is a very simple and efficient way to design a bridge for short and medium spans.
For modest spans, the bridge is normally held in position at one end and the other end is allowed to slide freely over the abutments.
What is the practical use of controlling the grading of concrete aggregate?
Fineness modulus defines the size of the of the aggregates on concrete mix design. There area some limits on it though. If you have high modulus of fineness, the tendency of mixture is to have less pores as possible. The less pores you have, the good is your bonding between each elements. However,less pores means less breathing space for your concrete. This inhibits hydration. Once moisture doesnt escape from concrete, then the strength is very difficult to achieve. On the other hand, low modulus of fineness tend to have lower bonding between concrete elements. However, you can have better curing condition of you have optimum pores on your concrete. The strength can be achieve quickly.
A counted loop is a loop that executes the loop's statement a pre-determined number of times. The count represent the exit condition of the loop. A loop that is not counted is an infinite loop.
What is the mass in metric tons of 500 cubic meters of sand?
The density of granular soils such as sands depends on their level of compaction. See table below:A
Description - SPT N - Bulk Density
Very loose - 0 to 4 - <1600
Loose - 4 to 10 - 1600 to 1800
Medium dense - 10 to 30 - 1800 to 1900
Dense - 30 to 50 - 1900 - 2100
Very dense - >50 - >2100
Where SPT N = Standard Penetration Test No.
Bulk Density = kgm-3
As such the mass of 500m3 of sand may be anywhere from less than 800 to over 1,050 metric tonnes.
Source:
Cobb, F. (2009) Structural Engineer's Pocket Book. Second Edition, Butterworth-Heinemann, Oxford.
How much Cement quantity is consumed in different concrete mix?
please define your question again. Different concrete mixes have different cement consumptions depending upon their design mix.
Engineering geology application in civil engineering?
Civil Engineering is to keep a structure in a stable position against various natural & artificial forces ..Geology helps the Civil Engineering to know about the nature of soil means various criterias which may support or against the stability of the structure like the bearing capacity of soil .thats why the soil exploration is act as preceding activity to finalize the foundation design of structures..
What are the uses of cantilever beams in real life?
A cantilever beam is often used for making balconies in residential architecture. A cantilever beam is a beam that is supported only one of its ends while the open end can support a certain weight.
What sank under the peace bridge?
There is a structure under Peace Bridge that looks like a sunken boat. It is however the original water intake system that is no longer in use, but still functional.
Cement is a building material made by grinding calcined limestone and traces of clay and gypsum. Its key use is as an ingredient for concrete or mortar.
- Cement is a heterogeneous mixture.
- Cement is used as a binding material for sand/aggregate.
- Cement is hardened by adding an appropriate quantity of water.
Difference between nuclear reaction and chemical reaction?
What is the difference between structural steel and reinforcement steel?
structual steel is the widw flange column's and beam's as well as plate steel angle iron ect.. it falls under aws D1.1 welding code. reinforcement steel/reinforcing steel is the rebar, dba,(deformed bar anchor), hsa, (headed stud anchor) that is placed in concrete, floors, walls, footings, ect... it falls under aws D1.4 welding code
What is the Bending moment of a simply supported beam with point load at the middle?
assuming the point load acts in the centre, take the value under it as P*L / 4
where P=point load (kN)
L=length between supports
if its not in the middle, take it as P*a*b / 8
a=dist from left hand support to load
b=dist from right hand support to load
thanks,
Abdul wahab
The " in not in the middle formula" is incorrect.
Your Welcome
Paul
Why is iron used in building bridges?
Because steel is stronger than wood.
But I'm not sure steel is stronger than metal, but steel is a metal and a pretty tough one.
Technical competency is the knowledge and skill to perform the activities within an occupation consistently and over time. This isÊfor a successful accomplishment of a business, job, or a task.Ê
How much would a 1 in by 3 in piece of granite cost?
It has to be a big part to be worth something. If it is just a rock. Nothing. If you are a worker offering to put in a table or countertop of granite it is alot. Well, not a lot maybe about $250.00.
What is the purpose of a bridge?
Expansion joints. This allows the bridge to shift or the materials to expand and contract in the bridge. This means that if it gets heated up it expands so it needs a gap so it can move and not break the road!
Surveying is the back bone of construction projects, we must need surveying before starting a construction project, during execution of construction activities and after completion of project.
Before starting project surveying help us in design and calculation of quantities.
During execution of construction activities surveying is most important thing, It help us to maintain the exact locations and heights.
After completion of project surveying is called topographic surveying and it helps us to prepare the As-Built drawings, to make comparison between design and actual constructed structures, to check the differences.
What is the different between project management and construction management?
Project Management is the application of knowledge, skill, tools and techniques to project activities to meet the project requirement.construction management is particular domain.project management is common to all domains.
Why spiral columns load capacity is more than tied column?
they will carry more load per diameter
spiral columns use concrete in axial load.
spiral columns resist barreling better but carry less load the longer they are
When was the Forth Railway Bridge built?
Sir John Fowler built it along with his friend Benjamin Baker.
The Forth Rail Bridge was
- the biggest manmade construction of its time - it was the largest civil engineering structure of the nineteenth century.
- the largest span bridge in the world
- also the first bridge to be constructed purely of steel . In fact in using steel produced by the Siemens open-hearth process, it established mild steel as a reliable structural material
- The bridge took seven years to build, cost £3.2 million (counting £250,000 for the abortive construction work on the earlier bridge designed by ) and used in excess of 50,000 tons of steel and 6.5 million rivets
- Fifty eight people died, one hundred and six received serious injuries and five hundred and eighteen other accidents occurred over the seven years construction lasted.
- A total of 5000 workers were employed in its construction
- In 1907 29,675 passenger trains crossed the bridge with a gross weight of 14,674,750 tons. This usage contrasts with the present day - when during 2000 the bridge carried 54,080 passenger and 6,240 freight trains with a gross weight of 10,500,000 tons.
- The Bridge replaced the Granton - Burntisland ferry - many of the passengers that were killed in the Tay Bridge disaster had used the ferry to cross over the Firth of Forth
What is the difference between engineering stress and true stress?
The difference between true stress & engineering stress is summarised as follows:
Engineering stress assumes that the area a force is acting upon remains constant, true stress takes into account the variation in the cross sectional area as a result of the stress induced deformation (strain) of a material.
For example a steel bar in tension once its yield point or stress is reached will start to "neck". Necking is the localized concentration of strain in a small region of the material, causing a reduction in cross sectional area at this point.
To calculate the engineering stress in the above case, the applied load is divided by the original cross sectional area, however the true stress would be equal to the load divided by the new deformed cross sectional area. Therefore true stress is likely to be significantly higher than engineering stress. Note that while the material is deforming elastically before the yield point is reached there will be some difference between true and engineering stress (as the material is changing shape) but it will be much smaller than the difference after the yield point is reached.
A rock core in a uni-axial compression test will typically expand radially under loading. Therefore in this case, the engineering stress (based on the original diameter) will be larger than the true stress within the material.
