Structural Definition and 215 Threads

(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...

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...

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?

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...

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...

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.

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)...

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...

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

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...

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.

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

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...

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...

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...

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

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...

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...

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...

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...

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...

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...

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...

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)...

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.

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...

[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...

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...

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...

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...

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...

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...

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...

Given: Draw structural formulas for all the alcohols that have the molecular formula C5H11OH. Name each one and classify them as primary, secondary, or tertiary alcohols. Describe how they are formed and give two uses for this type of alcohol. Solution: I am still at the naming portion but...

Structural integrity in my head means an object's uncompromised ability to safely resist required loads. Now is static friction related any way to it since the way to break structural integrity is to overcome the object's max load limit? Also how can you walk across the floor without you or...

I know annealing makes a material more ductile, but what are the differences in the structuer of the material? I have a picture I took of 1018 and 1040 untreated... if you know the difference, think you can point them out? I'm not looking for differences in any specific material I just have...

Homework Statement http://antishift.org/image.php?id=16122&size=medium Homework Equations Static Equilibrium equations: since most of the supports are rollers, only y-forces are considered as well as moment equations. I'm pretty sure E and F are hinges so there are no moments around E and F.The...

Homework Statement See Attachment Homework Equations The Attempt at a Solution Im not really sure how to get started. I understand the method of Joints, and all the solved examples I can follow. I started by analyzing the support reactions, and I am stuck already. There is...

i need help with this, i got lost in my chemistry lab, i know how to name the structures of molecules, but features such as flat area, troughs etc.

Hi I was wondering how heat effects the tensile strength of steel. Since there are various alloys under the banner of 'steel', I was hoping for simply a general idea of the effect, if possible. Here is a quick quote to steer us in a good direction:Most steel has other metals added to tune...

An extremely useful set of lecture notes for anyone who wants to investigate statics of indeterminate structures (i.e. the force and displacement methods). Influence lines are included too. http://www.ecf.utoronto.ca/apsc/courses/civ214/Lecture%20notes.html"

Does anyone have a site or link where I can get a proper full Lewis structural diagram of Quinine? And if possible, the Dipole forces drawn on the diagram to indicate polarity. Thanks a ton. Oh yes, and one more question. How do I determine the polarity of the whole molecule? The molecule being...

I don't know what I am doing wrong, please help. 2) How many different structual formulas can be written for C6H14 Include straight chain and branched chain compounds. Enter an integer as an answer. (I put in 5 but it say that I am wrong) 3) Which of the following...

What is the difference between structural isomerism and geometric isomerism?? Yea. The thread title explains it.

Scyllo-inositol should be more stable than myo-inositol, right? (unless I'm missing a certain detail) But in nearly all literature on inositols, it is always myo-inositol that is primarily focused on. Scyllo-inositol is said to exist in "trace amounts" along with other inositols, while...

hi there any 1 know how to work out shear force ona cut beam ? i got the str3 web page problems!

Need help with interpreting the UBC! :biggrin:

Can someone please help me start this question, I missed some vital notes in class and don't know how to do it. I just need to know the method so I can go on to do it myself Thanks :) http://img408.imageshack.us/img408/3743/question70yu.th.jpg

Can anyone tell me if the structural diagarm of Bismuth(III) Sulphide looks like this: S-S-S l l Bi = Bi

wut would be the best material for a nuclear bomb shelter (like metal wise and concrete wise).