Construction Definition and 253 Threads

Construction is a general term meaning the art and science to form objects, systems, or organizations, and comes from Latin constructio (from com- "together" and struere "to pile up") and Old French construction. To construct is the verb: the act of building, and the noun is construction: how something is built, the nature of its structure.
In its most widely used context, construction covers the processes involved in delivering buildings, infrastructure and industrial facilities, and associated activities through to the end of their life. It typically starts with planning, financing, and design, and continues until the asset is built and ready for use; construction also covers repairs and maintenance work, any works to expand, extend and improve the asset, and its eventual demolition, dismantling or decommissioning.
As an industry, construction accounts for more than 10% of global GDP (6-9% in developed countries) and employs around 7% of the global workforce - over 273m people. The output of the global construction industry was worth an estimated $10.8 trillion in 2017.

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  1. R

    Design a Construction Lift: Urgent Calculation Solution

    Urgent calculation: design a construction lift... the construction lift is used in a building construction project. the construction will raise building materials from ground level to any height up to 12.2m. The life will be at the top of a rigid scaffold that is not a part of the design...
  2. S

    Sound isolation capacity of an idealized wall construction

    I'm looking to understand how to estimate the sound isolation capacity of a wall structure. With rising degree of detail will probably come an exponantial increase in complexity. I'm looking to start of, euhm,... gently. :shy: What I've gathered so far: -The impedance of the wall seems to take...
  3. P

    Please help with this construction question im really stuck

    please help with this construction question I am really stuck! question is:- a reinforced concrete beam is to be 700mm deep. the minimum width of beam is to be used and 20mm size aggregate has been specified. three 25mm diameter bars have been calculated for tension reinforcement and three 16mm...
  4. T

    Construction of the Tensor Product

    For some reason, tensors seem to be a terribly mysterious topic, mentioned all the time, but rarely explained in clear terms. Whenever I read a paper which uses them, I get the feeling I'm listening to a blind man talk about an elephant. They have to do with multilinear maps. They are a...
  5. Fredrik

    Construction of a Hilbert space and operators on it

    When quantizing a classical field theory, e.g. Klein-Gordon theory, the Hilbert space of one-particle states is taken to be a set of equivalence classes of (Lebesgue) measurable and square integrable solutions of the classical field equation, but how do you use the classical theory to construct...
  6. I

    Construction Management - Questions for Engineers & Project Managers

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  7. A

    What is the definition of R in the tensor product construction?

    Hello, So I'm trying to understand the construction of the tensor product of 2 vector spaces as stated in the http://en.wikipedia.org/wiki/Tensor_product" . Now, in the article it states that the tensor product of two vector spaces V and W is the quotient space F( VxW )/R (F( VxW ) being the...
  8. D

    Understanding the construction of vector spherical wave functions

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  9. M

    Solinoid Construction: Bobbin Material and Rod Direction

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  10. S

    Proving the Equinumerosity of Infinite and Countable Sets

    Can you prove that \mathbf{R} and \mathbf{R}-\mathbf{Q} have same cardinality? One way would be to say that \mathbf{R}-\mathbf{Q} is not countable and must have cardinality <= \mathbf{R} and invoke the Continuum Hypothesis to conclude that its cardinality is aleph-1 same as that of...
  11. D

    Formal Construction in Algebra: Exploring Words & Equivalence Classes

    Hi, we often come across certain constructions in algebra that make use of some "formal" sum or "formal" linear combination or "formal" string of elements. Because this term is never defined, I have always been a little uncomfortable when it comes up. For a specific example, consider the...
  12. B

    Construction of SU(3) multipletts, implication of Gell-Mann-Nishijima

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  13. C

    How Can I Estimate Blood Velocity Using Doppler Ultrasound?

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  14. B

    Electromagnet construction questions

    I need a bit of help in constructing 2 small electromagnets with opposite poles for quickly moving a 4 or 8lb pull rare-earth magnet back and forth ~ 3 cm, farther if need be. _______ _______ ________ |e-mag 1|-----|r.e.mag|-----|e-mag 2| ("---" being a rail)...
  15. wolram

    Roofless living during construction

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  16. A

    Is it possible to create Orbital construction yards for Spaceships?

    can mankind do like the ISS and launch many sections of a orbital space-dock into the orbit and use these as a platform to build large ships required to transport people to other solar systems?
  17. S

    Golden Age of Construction Engineering?

    I'm watching a NOVA documentary "Secrets of the Parthenon", and the storyteller tries really hard to hype the ancient engineering technology, by saying our modern technology isn't capable of understanding/replicating what the greeks did. Is it me, or are they just suffering from the "garden...
  18. H

    Calculus Highway Construction Problem

    Homework Statement A segment of interstate highwya under consideration lies in a vertical plane. A segment with a grade of -5% is to be joined smoothly to a segment with a grade of 3%. The vetical parabolic curve which will accomplish this transition is to begin at a point with elevation...
  19. T

    Future construction - a theoretical estimate?

    Suppose we had the technology to produce artificial diamond beams and carbon nanotube rope cheaply enough to use in large quantities. If we use the diamond for compressive load, and the CNT ropes for tensile load, how tall a skyscraper could we build using these materials, in theory? Is there...
  20. A

    How long does it take for a car to travel 100 meters with a given acceleration?

    Homework Statement A car starts from rest at time t=0 and accelerates at -0.6t+4 meters/sec^2 for 0\leqt\leq12. How long does it talke for the car to go 100 meters? The Attempt at a Solution Since it says the acceleration is -0.6t+4 I integrated it and ended up with v(t)=-0.3t^2 + 4t...
  21. D

    Balancing the Forces on a Steel Beam Construction

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  22. Simfish

    Question on the construction of a limit

    http://www.math.caltech.edu/classes/ma1a/Fa07Ma1aHW2.pdf Problem 2 (note, I'm not a Caltech student, so this is not a violation of the Honor Code - also, solutions have been posted) The solution to problem 2 is at http://www.math.caltech.edu/classes/ma1a/07Ma1aSol2.pdf The question with the...
  23. S

    What is a Hamel Basis and How is it Used in Vector Spaces?

    I learned that given a vector space we can construct a basis for it. Can anyone give me an example of this thing (except the trivial example of 2-D and 3-D euclidean space.)
  24. R

    3 Dimensional Construction Program?

    Does anyone have any information whatsoever about freeware or any other software that I might be able to use. I essentially need to input coordinates, and would love to have some program construct a visual representation for me to see. That would be swell! Thanks everyone!
  25. C

    How Does Refractive Index Measurement Help in Determining Sugar Concentration?

    Hi, I'm not really good at physics, that's why I truly appreciate your help on this one. I'm doing a project about optics, and I've never studied optics at school before, and because my time is limited, I had to skim through the materials so I'm not really sure if what I do is right...
  26. R

    Construction of a cyclic sequence re the Golden Ratio

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  27. P

    Is Everything in the Universe Made from Hydrogen Atoms?

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  28. V

    Best route for construction management

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  29. Evo

    The Surprising Truth Behind the Construction of the Great Pyramids

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  30. A

    Construction Management: Insights from Experienced Professionals

    I know this is an engineering/physics forum but I was wondering if some of you could tell me more about this field. Although, I have frequently thought about civil engineering but after months and months of mulling over a decision, I decided not to pursue it (though I still go back and forth)...
  31. T

    Computing axis forces of a construction

    Hi all, I'm trying to compute the axis forces in the construction I put to attachment. I already have computed the R forces, but I don't know where should I start computing the axis forces from, from which point. Could please someone give me some advice? Thank you very much, best regards.
  32. K

    How Do I Calculate the Right Steel Stand Specifications for a Heavy Aquarium?

    I am having trouble figuring out how "heavy" to build a stand for a large aquarium. I have tried calculating "moments of inertia" and "section modulus" values, but frankly find myself lacking in the ability to work out my problem, this is quite frustrating for me. I like to think of myself as...
  33. Z

    Construction of the Roman Onager (catapult)

    Hi, me and a friend of mine decided to construct a Roman Onager for school. This is because of some kind of (practical) exam every student has to undertake here in the Netherlands. For example.. some people study the effects of alcohol on the human body and others build a rocket and try to...
  34. V

    How is the construction of an ac ammeter different from an dc ammeter

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  35. A

    Construction are or aren't able to hold? (tutorial)

    Constructions are or aren't able to hold? (tutorial) Hi everyone I have searched on google already and also on yahoo but couldn't find the tutorials which I am searching for, they are for mechanic - solidity (machine design of mechanical engineering - how much, what dimensions of specific...
  36. P

    Numerical Analysis - Construction of a Poincare surface of section

    (I am not sure whether I'm posting in the right forum. I apologize if I do) Does anyone have an alrorithm or a code (in any language) that constructs a Poincare surface of section? I want to do so for a Hamiltonian model: A mass under the influense of the Henon-Heiles potential. It has to...
  37. A

    Reactions in the mechanic construction

    Hi I am trying to figure out reactions in the mechanic construction which is here http://img.photobucket.com/albums/v309/Andreii/nalogca.jpg" . Datas of construction are: L1 = 7.1m L2 = 1m L3 = 0.2m F = 2.8 kN = 2800N M = 1.3 kNm = 1300Nm (this is torque) p = 2.5 kN/m = 2500 N/m p...
  38. H

    Books for Race Car Design and Construction

    Hi all! It's me again. I asked about how the wing of a design car should be designed before. Thanks for all your replies. I would like to have a good reference book for me to start from scratch learning how to build a race car, do you guys have any recommendation? p.s. I major in...
  39. C

    Why is the Anode at the Center of a GM Tube?

    Why is the GM tube polarised? What benefit comes from having the anode at the centre of the tube? What happens if you reverse the polarity?
  40. D

    Best Construction Material for Buildings

    for the construction of buildings which one is the best titanium aluminium iron cosider all properties DO NOT CONSIDER COST
  41. H

    Cool category construction: Q-trees

    Hurray for an alliterative title. I guess I'll have to apologize in advance if you don't like logic-type stuff, but I thought these were pretty cool! A Q-sequence is basically a formal-logic-like thing you can do in any category. The basic example is that of a diagrammatic definition...
  42. 0TheSwerve0

    Social Construction of Gender & Intersexed Individuals

    Everyone knows (or does now) that gender is another socially constructed category. It is based on biological differences (which are real) such as differences in DNA, hormones, genitalia, sexual orientation, and overall appearance. Even the idea of what sex a person is is not always certain. A...
  43. H

    Interpretation of categorical construction

    The other day, I (once again) decided that I simply don't understand natural transformations. (Or functor valued functors, for that matter... which greatly disturbs me because I'm usually quite comfortable with function valued functions) So, I sat down to try and figure them out, and I...
  44. C

    Innovations for Assisting Astronauts in Space Station Construction

    Does anyone have an idea of an innovation i could design to assist astronauts in the contruction of a space station? I really have no ideas, and am looking for something simple but really clever and effective. Help will be extremely appreciated :smile:
  45. C

    Construction of number system

    "Construction" of "number system" Hi everybody, How is the number system created and defined? I am talking about the natural numbers, but I am not actually asking about the definition and properties of N (Peano) but for the way that we have agreed to produce numbers. I mean, we have defined...
  46. X

    How are nanoshells constructed in modern labs?

    I can't seem to find much information on the construction of nanoshells. If anyone can post a link or briefly explain how nanoshells are generally created in a lab today, I would be very thankful. I'm supposed to write a paper on nanoshells and their impact on medical science. So any further...
  47. H

    Need Help Building a Rotating Wood Platform for Adults? Let's Discuss Solutions!

    I am trying to construct a wood platform that rotates both clockwise and counter - clockwise. It needs to be able to hold an adult and be propelled by an electric motor that can be operated from a short distance from the platform. It doesn't need to be fancy, I just need it to rotate people at a...
  48. D

    Titanic: Hull Materials & Construction - Get Answers Here!

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  49. T

    How Much Enriched Uranium from Electrolysis and Fractional Distillation?

    What is the general output of enriched uranium from an electrolysis and fractional distillation process? I have already researched the outputs for gas diffusion, thermal diffusion, gas cenrifuge, laster isotope separation, and mass spectroscopy. If you could give me any information on its...
  50. H

    A Curious Construction: Defining Z-Sets and Their Properties

    For each ordinal number i, recurisively define: \begin{equation*}\begin{split} Z_0 = \{ \varnothing \} \\ Z_i = (\bigcup_{j < i} Z_j) \cup \mathcal{P}(\bigcup_{j < i} Z_j) \end{split}\end{equation*} Definition: A set S is a Z-set iff there is an ordinal i such that S \in Z_i...
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