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. M

    Static structural analysis on a solid sphere?

    Could you perform Static structural analysis on this solid sphere? No contacts to be used. I do not have any specific boundary conditions(unable to apply constraints to a complete solid spherical body) All i know is the pressure that needs to be applied. You could consider a smiley ball on...
  2. Z

    Which L Bar Orientation Offers Maximum Downward Force Strength?

    Hi All. Given a 20 inch L bar with 1" sides. If 6 inches of this bar is buried in a concrete wall horizontally, which orientation would render the most downward force strength? 1. A V orientation with the tip of the V pointing down. 2. A V orientation with the tip of the V pointing up. 3...
  3. ramzerimar

    Software for learning structural analysis and FEM?

    I'm in the third semester of mechanical engineering and I'm taking classes on engineering statics right now. Our professor said the he will give us a preview of finite element methods at the end of the semester. Which softwares would you recommend for learning basic structural analysis? I mean...
  4. U

    Structural engineering question -- maximum load taken by beam

    dear all , My question is what is the maximum load taken by beam of UB 610 x 229 x 125Kg/m for a span of 5 mtr? its supported on both side by anchoring on concrete beam.
  5. A

    Structural Engineering - Deflection

    Hey Guys, I wanted to know if anyone knew the proof for the Simply supported beam with central load formula; wmax = F*L^3 / (48*E*I). I have looked some soureces up, such as https://en.wikipedia.org/wiki/Euler%E2%80%93Bernoulli_beam_theory , but i don't really understand how they ended up with...
  6. C

    Help with structural formula and absolute configuration

    1. Complete structural formula, identify the absolute configuration of each asymmetric center (if it applies) Bond rotation may be necessary2. Is the first one right? The second one which is Newman must be turned to boat and then I write it in the boat?The Attempt at a Solution : On the paper[/B]
  7. Astronuc

    Structural Mechanics in Reactor Technology (SMiRT)

    The SMiRT conference/symposium has been an important venue over the decades for folks involved in structural mechanics applied to nuclear power systems, from fuel and core components, to large components like pressure vessels, piping, heat exchangers, and related equipment, up through...
  8. M

    Gift for Structural Biology professor

    Hello, I would like to offer a gift to one of my professor who has been extraordinary nice to me this past year. He is a physicist in the field of Structural Biology. I am thinking of buying him a cool book/illustrated novel about history of science. The best that I have come up so far is...
  9. AzarulNaim

    Structural analysis in ANSYS

    i'm new in ANSYS software. So, i want helps from others. that is my part. i need to do structural analysis on it but i don't know what supports and loads i need and how to do in ansys. supposely, my part will rotate with 50rpm, torque = 120Nm. diameter of cylinder is 80cm, height of spike is...
  10. Raf76

    Guides for bolt diameter and length against plate thickness?

    Hi, I tried to find design regulations/codes that specify relations between bolt diameter/bolt length against connected plate thicknesses. I couldn't find that in Eurocodes 3. Can someone help me with info where to find those regulations ? Example: can we connect 5 mm plates using M24 ? or...
  11. R

    Is Structural Integrity Inc the best nuclear plant services?

    Is Structural Integrity Inc the best nuclear plant services company ? Which companies are the best rank NPP services company? Thank you!
  12. J

    How to measure displacement and Force simulatuously in Ansys Structural domain

    Hi i am performing a multiphysics simulation in which i am importing results of Electric-Thermal domain into Transient Structural domain in Ansys Workbench 14.5. As the simulation time is 5 hrs and given that i have to perform 20 case studies , so i want to know is their a way around in Ansys...
  13. C

    How Do You Calculate the Diameter of a Steel Rod for Furniture to Ensure Safety?

    Hello I am looking for help with the following: I am designing a piece of furniture where most of the person's weight will be taken on a metal (steel) rod resting on a wooden batten. I need to calculate the diameter of rod needed to ensure it is safe to sit on. As a chemical engineer I have...
  14. C

    Does Angling a pin support on a truss change anything?

    Homework Statement If you had a simple 2D truss with a pin and a roller support, would making the pin on a 30 degree incline change the supporting reactions? Homework EquationsThe Attempt at a Solution Can't see why since it still supports a horizontal and vertical, don't know hwy the angle...
  15. P

    Continuous beam deflection (structural)

    Homework Statement Using continuous beam theory, constructing BM diagram from points b to c, to calculate the max deflection. I only found a have a single solution, though the BM digram show two points of zero bending. I can provide the solution. [edit: Rb = 685 N] Homework Equations...
  16. J

    Unable to get the expected result in Electro-thermal-Structural problem

    Good Day, I am working on a problem in which i am coupling "Thermal-Electric" physics with "Transient Structural" in Ansys workbench V 14.5. I am supplying electric energy(Voltage) to a structure which gets heats up due to Joule Thomson effect, and then i connect it's "Solution" to "Setup" tab...
  17. A

    Design code for structural steel materials

    Bidders propeses ASTM A36 material istead of S275 J2 or S355ML/NL for structural steel (Piperack, Equipment Structure, etc.) on the basis of international standards for most optimal and economical design. Is it really optimal? pls explain why
  18. J

    Mathematical modelling of Electric-Thermal-Structuralphysics

    Hi i am working on a research paper for which i need very good citation for the analytic analysis coupling Electric - Thermal-Structural physics(via Joule Thomson effect & Thermal stress/strain). Please provide any good source of mathematical relations describing the above complete or in part...
  19. Tim Allen

    Help with designing horizontal framework for UDL

    Hi, For my engineering project for college I am designing a rotating table/steel frame structure for supporting a mild steel panel which weighs 180kg. My previous experience with UDL's has only been in using a 2D beam like situation to calculate how the load is spread, bending of the beam and...
  20. Manta173

    Small scale application of structural cross sections

    I am working on fixing a heavy walnut cedar chest lid that has bowed convexly from the chest. It is about 1/4" high in the center of a 24" deep lid. The lid is ~2' x 5'. It is made from 3/4" walnut with 3/4" x 3" ribbing on the top. I thought that adding in some C-channel or square tubing would...
  21. TNesher

    Engineering Is structural engineering worth it?

    Hi, Right now I am in my 3rd year of a dual construction management and environmental engineering degree. I have an interest in building things (both design & construction), but more important to me is a career with a high income and quality of life. I am debating between a structural...
  22. G

    Structural Vibrations Analysis & Simulation

    Recently I created a structural vibrations simulation and would like to hear some feedback or suggestions.
  23. M

    Structural Frame Analysis: Determining Shear and Bending Diagrams

    Homework Statement Hello. I've created a small program to find shear and bending diagrams of the members of a frame. I was able to get the reactions at the support but don't know how to continue from now. This is an example of a frame all columns are 3m in height and the beams 8m. All the beams...
  24. M

    Structural analysis of a concrete frame

    Hello. I have a project for next semester and I'm thinking of creating a program using mathematica to analyze a concrete frame to obtain the moment and shear diagram. What would you consider the best method for analysis. The loads will be uniformly distributed. Any tip will be greatly...
  25. H

    12m span of concrete roof slab

    Hi, I am designing a concrete roof slab that span across 12m long and 9m width for my living area. The support columns are placed in each 4 corners and they are 300mm x 300mm size. The concrete slab roof is cantilevered out by 1.8m on 3 sides (not all 4 sides) with the thickness of 150mm. At the...
  26. Y

    What is the structural component of disjoining pressure?

    It is widely believed that there are three components of disjoining pressure: the dispersion component (Van der Waals), the electrostatic component and the structural component. For the first two, there are some accepted formulations for calculation. However, I cannot find any equations for the...
  27. CivEngMo93

    Structural Stability & buckling stress

    Q: A structure is made from identical, axially compressible robs connected to a rigid foundation. The rods cannot buckle. In the unloaded configuration the angle between the rods and the horizontal is (alpha); then angle becomes (1-Beta)*alpha when p =/= 0. Find the relationship P(Beta)...
  28. K

    Calculating size of wooden members

    I need help calculating the size of the wood members I need in my truss. I understand the basics; I first need to calculate the load, then the stress on each member, then pick a wooden member which has that stress with a safety factor of let's say 2.0. The reason why I want to perform the...
  29. S

    Insulation of steel beams - heat transfer

    I'm working on a problem involving steel structural members on the exterior of a building. I need to figure out how much insulation (for summer conditions) and possible heat tracing (for winter conditions) would be required to maintain minimum and maximum temperatures. I know I need to use the...
  30. W

    How do folding wings maintain structural integrity? Removable wings?

    Without a single full lengthed spar going through the whole length, how do folding wings and removable wings be designed such that they maintain structural integrity in flight and other motions involving declarations and accelerations? For example, this is the folding wing of a Sonex Onex...
  31. R

    Structural Differences Between Red, Blue and Green Xenon Lamps

    What are the structural differences btwn red, blue, and green xenon lamps. What are the different dopants/gases used in the lamps?
  32. medeek

    Residential Structural Engineering: Beam Calculator for Sawn Lumber

    I've recently started doing a lot more residential structural engineering for local clients and the first thing that I realized was that I was lacking a good beam calculator. I do have a number of spreadsheet calculators but I've found them hard to program and once I do have them programmed...
  33. P

    COMSOL - Structural Mechanics - Membrane - vibration without input?

    I've just got a quick question that hopefully someone can answer. My question is - why does the membrane in COMSOL vibrate without you telling it to? Here are some specifics if required... In COMSOL here are my setup details: - Physics: (3D) Structural mechanics - Membrane Study...
  34. K

    Engineering Structural engineer - vehicle structures after civil degree?

    Hi, I'm an engineering student in Civil/Structural engineering and am interested in structures. As well as fixed structures I am also interested in mobile structures like ships. Can I get a job designing vehicle structures after graduating from a degree focused on civil structures? Would the...
  35. H

    Structural Dynamics Analysis - Modal method or time integration?

    Hi all, I need help with numerical solution of motion equation. From the numerical point of view and in the real of the finite element method, which method is recommended for the solution of damped ( proportional damping) linear motion equation? I have been trying three common methods; Modal...
  36. M

    Computing geodesic distances from structural data

    Greetings, I am attempting to compute geodesic distances on manifolds where structural data have been sparsely sampled. First, off I am not well versed in the mathematics of differential geometry but I do have some knowledge (from an introductory differential geometry class in my...
  37. J

    Structural Mechanics. bending moment and bending stress

    [b]1. Homework Statement [b/] A timber beam, with rectangular cross section (h × b) is reinforced with additional full width (b) steel plates. There is a plate of thickness t securely connected on the bottom and a plate of thickness 2t on the top of the timber to ensure composite action in...
  38. D

    Structural Weld Analysis Techniques for Aluminum Welding - Ask Here!

    Hey folks great forum here! Anyone here have a good reference for structural weld analysis technique? I am not looking for code requirements but a general techniques and knockdown factors for aluminum welding. thanks Dan
  39. W

    How do i simulate this situation in catia Structural analysis?

    I have a rotor spinning perpendicular to the direction of travel of a car. Its supported at either end of its axle by bearings. The car crashes and I've calculated the force of the crash to be approximately 672kN. How would i simulate this on the rotor as a shock load? I could do it as a static...
  40. T

    Calculating Torque using Steiner Theorem?

    I am going to do some structural analysis of the wing. The upward shear force, or lift, is acting at the aerodynamic center. There is also a moment about the a.c. I am just wondering if I need to take the moment relative to the aerodynamic center into account when I calculate the torque about...
  41. C

    Exploring the Effects of Scale Analysis on Structural Mechanics Problems

    Hi there, I am trying to solve a structural mechanics problem. I am doing so by two methods. On one hand, I am using a F.E.A software (ANSYS) to get me the solutions. At the same time I am solving the problem analytically. The issue is that ANSYS is solving the problem using a diferent theory...
  42. N

    Structural Engineering Analysis: Intermodal Shipping Container

    Hello, For a structural analysis term project I'm currently working on, my team has come across a problem. Here's the setup: Intermodal shipping containers (dimensions 8ft height, 8ft width, 40 ft length) can (according to company sources) be filled to a max load that grossly weighs 66...
  43. J

    Analogies for magazine article related to structural engineering

    Homework Statement Hi all, I'm writing an article for a scouting magazine. It is a short column to inform people about the danger of using long -badly supported - horizontal poles. I'd like to compare the situation of using a short beam and a long beam, and then able to tell a rough percentage...
  44. E

    Mathematical help with structural analysis.

    In the attached equation from structural analysis, I don't understand the transition between the second and third equal signs. I think that u_{j,l}da_l = u_{j,1}da_1+u_{j,2}da_2+u_{j,3}da_3 , so doesn't equating da_j\delta_{lj} = da_l assume that l=j . can anyone help me see why this...
  45. N

    Comparing structural bending strength

    Hello, Not sure how to go about solving this problem: What outer diameter must a 2mm thick hollow rod have in order to have the same structural bending strength as a solid rod with diameter of 7mm? Also compare the weight per unit length of the two rods. Assume that material is stainless...
  46. R

    Help with Structural Engineering Problem: Summation of Forces/Moments

    Hi there, i hope someone can help me. I am just unsure how to proceed with this problem. Homework Statement The question and diagram can be found in the attached image. I am looking for assistance on part (ii) Homework Equations 1. Summation of Moment = 0 2. Summation of forces along x -...
  47. 0

    Structural Engineering Stress Question

    Homework Statement Piano wire weighs 77kN/m^3 and breaks at a stress of 3000MPa. Calculate the length of piano wire that can be lowered down a very deep mine before it breaks. Homework Equations stress = force/area The Attempt at a Solution Piano wire = 77 000N/m^3 stress = 3000...
  48. M

    Calculating Mass of a Structural I-beam

    Homework Statement A structural I-beam is made of steel. L = 12.1 cm, H = 32.0 cm and the width of the beam is W = 1.11 cm. What is the mass of a section 1.75 m long? The density of steel is 7.56E+3 kg/m3. Homework Equations d=m/v The Attempt at a Solution I can't copy the...
  49. J

    Structural Design Philosophies?

    Good day! I don't know if they are called Structural design philosophy but, can anyone enumerate(if the list is incomplete) and differentiate the : 1. Ultimate Strength Design 2. Working Stress Design 3. Limit State Design 4. Allowable Stress Design 5. Others (If there are) Help...
  50. S

    Thermo Camera and iridescence, a structural colours

    Dear PF, I am hoping you can help. I am trying to test the the speed that a beetle heats up under standardized conditions. I have buried a small container in crushed ice and place a beetle and thermometer inside. I wait until the thermometer and has reached 0°C, the idea then is to increase...
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