What is Structural: Definition and 233 Discussions

A structure is an arrangement and organization of interrelated elements in a material object or system, or the object or system so organized. Material structures include man-made objects such as buildings and machines and natural objects such as biological organisms, minerals and chemicals. Abstract structures include data structures in computer science and musical form. Types of structure include a hierarchy (a cascade of one-to-many relationships), a network featuring many-to-many links, or a lattice featuring connections between components that are neighbors in space.

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  1. B

    Centroids of a structural Shape

    I have a problem trying to find the centroid. I have a plate that is 8in wide and .5 in thick. Then 2- C beams (C8x11.5) placed at each end of the 8in beam with the tips facing each other. They do not go beyond the 8 inches. So it's like a U as an example with the tips facing each other. I...
  2. K

    What are the structural benefits of a hyperbolic parabooid roof?

    How do you explain the structural benefits of a hyperbolic paraboloid roof? I think the 2 catenaries help distribute the weight better, but not I'm not sure if there are additional properties for this design. Thanks for your help...
  3. D

    Recursive using strong induction and structural induction (rosen)

    Homework Statement Let S be subset of set of ordered pairs of integers defined recursively by: i) (0,0)\in S ii) If (a,b) \in S, then (a, b + 1) \in S, (a+1, b + 1) \in S,(a+2, b + 1) \in S a) List the elements produced by 4 applications of these steps b) using strong induction on the...
  4. S

    Structural alignment in ferromagnetism

    Is it enough/correct to say "the atoms are aligned" in a ferromagnet, or must you specify that "the electrons (or their spin) are aligned"?
  5. D

    Are these the correct skeletal formulas for all structural isomers of C5H10?

    Homework Statement Draw the skeletal formula for all of the structural isomers of C5H10 Homework Equations The Attempt at a Solution I attached a picture of what I got so far. Are they right and am I missing any. Thanks a lot. I know that there should be another line coming from the corner...
  6. X

    How Does a Cantilever Beam Impact Structural Calculations?

    1. Homework Statement Homework Equations I am totally confused about this question because of the Cantilever beam. I am usally ok with these questions but the addition of the Cantilever beam has thrown me off. The Attempt at a Solution Only been attemped without Cantilever beam.
  7. F

    HELP: Simscape for structural engineering

    Hello, I am assisting my professor by investigating the usefulness of Simscape in structural engineering. I have just recently obtained a copy of Matlab, and I am totally unfamiliar with the entire program as a whole. I was wondering if anyone knew of any good reading materials or tutorials...
  8. N

    How can I solve this structural mechanics problem accurately?

    I've been trying to solve a structural mechanics problem from the book Mechanics of Materials, but the results I acquired weren't very satisfying. Here it is Homework Statement [PLAIN]http://img42.imageshack.us/img42/4375/p17n.jpg Homework Equations Average Stress: \sigma= F/A...
  9. B

    Should I Add Diagonal Bracing to My Structural Steel Frame Design?

    Hi there, I've got an assignment due today and as usual have left finishing it off until the last minute. I've completed most of it but I thought I'd try and get an opinion on something. Homework Statement Basically our teacher has asked us for a very simple steel frame (beam, column...
  10. R

    The difference between structural unit and repeating unit?

    Homework Statement The difference between structural unit and repeating unit Homework Equations The Attempt at a Solution http://en.wikipedia.org/wiki/Structural_unit wikipedia gives an example with polyethylene terephthalate but I can't figure it out based on the slight...
  11. P

    Structural Analysis - Trusses

    Homework Statement Below is a truss system, use the point method to solve for all forces within the trusses. http://tinypic.com/view.php?pic=25i2dma&s=3 my question, If I take pin F then I have 4 trusses, 2 of them known(FE, FD) and 2 unknowns(GF, CF). exactly what should I do with truss...
  12. L

    Dr. Emoto's : the structural formation of ice crystals

    Hello every one I hope I'm in the right place to ask this question :) well , have you heared about Dr. Emoto's ? http://www.is-masaru-emoto-for-real.com/" my friend were in US last year , and she was joining some one who provides her by these info. when she told me , it was my 1st...
  13. M

    Aft Wall Structural Analysis

    For a summer job I am employed to look into the use of composite paneling in place of sheet aluminum with stiffeners. I am suppose to find the required thickness of composite wall paneling in order to make a structure such as the one attached. Obviously it will depending on the material...
  14. P

    Determine location of structural break in cross-section data

    I'm trying to run a simple regression for a data set (n=165). I've determined via a Chow Test that there exists a structural break somewhere; the same least squares estimate cannot be accurately used to represent the entire range of values the explanatory variable takes on. I've found two very...
  15. C

    Comparing Structural Determination Methods for Methodcomparosin (MC)

    Homework Statement ' In a recent publication in the Journal of unusual Protein Structures, the authors reported the structure of the protein methodcomparosin (MC). They compared different methods for structural determination, as detailed below, and reported that the same structure was obtained...
  16. K

    Structural Geology: Fault Correlation

    (I moved this from the Homework section. I hope it is okay I am posting here.) Homework Statement We are given six cross sections each spaced 2km apart and from these we are supposed measure the slip of the fault, and map the hanging-wall and footwall cutoffs to another worksheet that is...
  17. K

    Structural Geology: Fault Correlation

    Homework Statement We are given six cross sections each spaced 2km apart and from these we are supposed measure the slip of the fault, and map the hanging-wall and footwall cutoffs to another worksheet that is the map view of the cross sections. Once we have mapped all of the cutoffs and...
  18. B

    What is the Best Way to Repair and Strengthen a River Boat Structure?

    Am considering the use of 6063 aluminum sq tube to repair/augment the structure of my river boat. Approx 3 yrs ago, I removed the 5 welded on chines that ran the length of the bottom of the boat ( they were mostly crushed & lost their strength ) and covered the bottom with 3/8" UHMW. This has...
  19. K

    Organic Compounds Structural Formula

    when drawing the structural formula for 2-methylbutane or 2,3-dichloro-2-methylbutane,does it matter which end of the chain i begin counting from?
  20. S

    Method to obtain Torsion Constant (structural)

    Hi every one. I just wonder whether using Ix+Iy = J is a suitable method to calculate the Torsion Constant of a plate girders (full penetration butt weld at connection section) Since, as stated at wiki, the polar moment of inertia is only identical to J for circle tube and rod. p.s. is...
  21. A

    General Questions About sizing Structural Beams.

    General Questions About "sizing" Structural Beams. Hello Guys. I would like to know where I can find high quality info on which types of beams to use for certain applications. Say, for example, a 100 foot span which is supposed to hold 100 tons at the center, or cantilever, and so on. I know...
  22. T

    Structural Engineering with Mechanical Engineering background

    Someone with a BS in Mechanical Engineering can he branch off to graduate studies in Structural Engineering so he can be involved in construction projects, piping systems, water distribution systems and complex utility projects, etc. If so, what does he need to do.
  23. A

    Logic: Structural Induction and Tree-method problem

    I have this challenge to do but can't seem to be able to understand it completely! I also have test right now and can't concentrate. Please help this poor soul! It will be appreciated! The first question is:Let F ∈ PROP. Let (h)F be defined by the number of parentheses in the formula F. a)...
  24. D

    Structural Models of the Atom

    Homework Statement According to classical physics, a charge e moving with an acceleration a radiates at a rate dE/dt = - (e2a2)/(6pi epsilon c3) a) Show that an electron in a classical hydrogen atom spirals into the nucleus at a rate dr/dt = - e4/ (12pi^2 epsilon^2 r^2 me^2c3) b) Find...
  25. H

    Practicing Structural Drawings

    Did I draw this correctly? http://img151.imageshack.us/img151/7946/correctj.jpg Thank you
  26. R

    Structural steel evaluation

    I have a removable gooseneck semi-trailer (RGN) I am going to stiffen it to hold a higher capacity. 30 ton to 45 ton. This hauls large equipment. (yellow iron) I know from experience what to use and how to do it. Is there some one here that can do the calculations and make a drawing of the...
  27. S

    ASTM A997 structural steel properties

    Is there any way I can find out the properties [without having access to the beam itself] of the ASTM A997 beam without subscribing to ASTM? Specifically what I am interested in is the weight per foot. Thanks in advance for any help.
  28. C

    Structural Eng: Find Deflection in Simply Supported Beam

    How can i find deflection in simply supported beam with multiple point loads ?
  29. C

    How Is the Deflection Formula for a Simply Supported Beam Derived?

    Hi,:smile: I am only new to this forum so any feedback would be greatly appreciated. I am wondering if anyone could help me derive the formula for a simply supported beam with a uniformly distributed load. I understand that it is done using integration but I fail to understand the steps...
  30. radou

    Structural dynamics - advice for senior thesis

    Hello to all, I am just about to start working on my senior thesis (I'm not sure if this is the exact equivalent term in english speaking countries - basically, it's the thesis you have to do in order to finish your studies and gain your engineering degree), which I selected to be in the...
  31. H

    Structural Dynamics: Forced Oscilliation Question

    Hello, I have a question about structural dynamics. The question is about a forced oscilliation. My question is about this picture, with the very short text: http://img17.imageshack.us/img17/5025/sd001.jpg This is a forced oscilliation with the ground moving, and a mass inside a structure...
  32. K

    Proving associativity is a structural property

    Homework Statement Give a proof for the operation * is commutative being a structural property. Homework Equations The Attempt at a Solution * is commutative I know this means that I have to show (a*b)*c=a*(b*c) I'm not sure where to go now
  33. M

    Organic Chemistry- Geometric and Structural Isomers of C6H12

    Homework Statement Draw and name all of the structural isomers of hydrocarbons with the formula C6H12 (cyclohexane). 2. Relevant information This is "only" a grade 11 Chemistry Assignment, therefore I only really need the basics when it comes to isomers- not some of the more complex...
  34. E

    Structural Engineering -12x12 stiffness matrix analysis

    Hi, I am trying to write a MATLAB script to do an elastic analysis of 3D frame sturctures. The method I am using is the direct stiffness method, but I cannot find the equations for the 12x12 stiffness matrix for each member in the global system. If anyone has any information on 3D matrix...
  35. L

    Structural Safety Of Freedom Tower

    I haven't heard much about this in detail, but does anyone know what changes they made in the structural design of the Freedom Tower to prevent the collapse of the tower in the case of it being attacked via jetliners? I know it can't be 100% certain, but I would think they would have done...
  36. M

    Structural Analysis - basic beam question

    Homework Statement See attachment Homework Equations Im using sigma(max) = -EKy where y is the dist from neutral axis .: sigma(max) = -(M.y)/I ----------(1) plus the standard statical equil. equations. The Attempt at a Solution I use y = 170mm "I" is given as 301.3x10^-6...
  37. H

    Calculating the mass and number of atoms of a structural I beam.

    Homework Statement A structural I beam is made of iron> A view of its cross-section and its dimensions is shown in the figure, where d = 2 cm, w= 31 cm, h= 28 cm and the length (not shown) of the beam is L= 1.53 m. The density of iron is 7560 kg/m^3. The atomic weight of iron is 55.85 g/mol...
  38. H

    Calculating the mass and number of atoms of a structural I beam

    Please add this title: Calculating the mass and number of atoms of a structural I beam. Homework Statement A structural I beam is made of iron> A view of its cross-section and its dimensions is shown in the figure, where d = 2 cm, w= 31 cm, h= 28 cm and the length (not shown) of the beam...
  39. S

    Structural Analysis- Properties Of Sections

    The two steel channels shown are arranged to form a compound section in which Ixx=Iyy. Determine the value of the dimension 's' that will satisfy this condition. We have been working on radius of gyration, section modulus, second moment of area, the parallel axis theorem, polar second...
  40. A

    Solving Complex Structural Challenges - Can a 1000kg Lift Force Lift 950kg?

    hi, i have this problem that i am trying to figure out, but seems i need some help..:) ii have attached an image and an animation to clearly explain my problem. what i am trying to understand is will the green base with its 1000kg lift force be able to lift the pole with the red dot (950kg)...
  41. P

    So structural beams are used pretty much everywhere right?

    like everyday homes and highway bridges and almost every other building right? just making sure... I mean, I've never actually seen an everyday home being built and you can't see them just by standing inside the house.
  42. A

    Can Someone Help Me Calculate the Weight Capacity of My Hopper Structure?

    My engineer is out of contact and I need to verify what my contractor is telling me. ANY HELP WOULD BE GREAT AS THIS IS HOLDING UP A MAJOR JOB. I have a hopper 8” x 4” (l x w) that is supported by 2” square tubing (3/8” thick). The structure looks like an oil derek and is 12’ high with...
  43. S

    "Assortment of Structural Steel Beams"&amp

    [SOLVED] "Assortment of Structural Steel Beams"&amp Hi, Dose anybody know the solution for this problem? Please, help. Thanks, A Japanese industrial firm, Itsa Steel Company, manufactures structural beams of a standard length. The strength of a beam...
  44. E

    How Can I Master Structural Matrix Analysis Using the Flexibility Method?

    Hi, My question isn't about a specific problem in general so I apologies if I have Posted in the wrong section. Basically I have just started a course on Structural analysis, and we have been using the flexibility method to solve all of out problems in matrix forms. All of the problems we have...
  45. S

    How many stereoisomers of C4H8Br2 have structural isomers?

    Homework Statement Name the structural isomers of C4H8Br2 and remember to number the carbon atoms such that you minimize the numbers in the name. How many stuctural isomers of C4H8Br2 are there? The Attempt at a Solution I'm not sure how many there should be. So far I've found 9...
  46. K

    Does Timber Beam Deflection Exceed Safe Limits?

    Will a timber beam deflect more than is safely permitted? If a timber beam has dimensions of 225 mm by 75 mm and holds a UDL of 3.5 kN/m over a span of 4m. And If Young’s modulus for the timber is 10 kN/mm2, how much will the beam deflect? A joist bending moment calculation? A joist has...
  47. L

    Finding Equations for Simple Structural Mechanics Problems

    I'm out of college for decades, and all my "handbooks" and college books have been packed away and inaccessible for some months. I need a source, or the equations as follows [all very simple, fundamental stuff; Chap One in "Strength of Materials", so to speak] 1] Beam supported both ends...
  48. R

    Difference between structural and mechanical engineering

    I really have trouble deciding which of these two programmes I should choose. I do really enjoy math and mechanics, and by reading which kind of subjects they have, the both seem very interesting. But it seems that structural engineers have a lot more "calculation" subjects, is this right? If...
  49. W

    Structural mechanics-force diagram,shear stress,elastic curve

    There are totally 4 questions .i struggled for a whole day and i still cannot solve it.Please help me! For Question 1: My problem is that i cannot find out the reaction Ax,Ay,Dx,Dy though i establish 4 eqt: 1:Ax+Dx=90 kN 2:Ay+Dy=90 kN 3:summation Ma=0 ,anticlockwise positve...
  50. Pyrrhus

    Static tests of timbers in structural sizes (ASTM D198-84)

    Hey everybody, My friend Brian and i are trying to understand the procedures for this specific test, has anyone here worked with this before? Anyway, we are not sure when the wood beam should be considered broken. The test doesn't seem clear. A simple outline of this test is a simply...
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