Structural Definition and 235 Threads

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...

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...

Static structural simulation with rigidity and strength criterias I have a 10 mm imbus key which is constrained on the shorter end, while there's a force on the longer end simulating ccw rotation (i.e. "unscrewing"). I have no problem setting the force and simulating deformation and...

Homework Statement I am doing my internship at Saint Gobain Glass India, Chennai . I have been allotted a project to work in my time at the company . The problem is related to failure of an Mild Steel beam supporting graphite structure in the process line . As such this beam is exposed to...

Hi all, I am trying to designing a structural pipeline support. The pipeline is at a 60 degree angle and is connected to a riser pipeline - I have the transferred loads that the pipeline will experience from the riser and have created an FBD. I initially thought the load that the support...

I have several questions that are related to something I am designing. I am having a hard time finding the correct formulas I need, so I am here :D Anything will be helpful, from general topics/ideas to get me in the right direction, to specific formulas. I do not mind abstract ideas, this is a...

Homework Statement A viscously damped system has a total weight of 250 N, a spring stiffness k = 8 kN/m, and a damping coefficient c = 0.08 kN-sec/m. Determine the displacement, velocity, and acceleration of the mass as a function of time if it is disturbed from its equilibrium position...

Hello. I am currently a mechanical engineering junior at the University of Kentucky. I am beginning to consider graduate school. I know I want to study applied mechanics, but am unsure of whether I should study CM as a ME grad student or SE as a CE grad student. What is the difference between...

Show all possible structural diagrams for HCN. Isn't there just one? H (single bond) C (triple bond) N I can't draw a resonant structure because there is none (resonant means only moving of the bonds not the atoms, no?). I don't understand.

So I need to find the structural orientation of CO32- The answer is that its trigonal planar, forming a double bond with one of the oxygen atoms. However, why is this so? Why does one of the oxygen atoms form a double bond instead of a single bond as the other atoms do? See...

Hi guys, Please suggest a good introductory books for Structural Geology and Optical mineralogy, thanks :)

Hello, I am currently doing a project and have ran into a problem. I have a structural fitting (clamp-on tee) that fits around a fixed structure. I am trying to fit an aluminum pipe into it, but the pipe's outer diameter is much smaller than the clamp-on fitting. I'm attach 2 images that show...

Homework Statement The simply supported timber foot bridge shown in figure 5 spans 7 metres and, as shown, is carried by two Engineering grade Douglas Fir beams. The uniformly distributed load due to the self weight of the foot bridge and beams is 96 kg/m. The bridge is required to carry a...

See the pdf here: www.ellipticinc.com/table.pdf Will this table must be able to hold a 1500 lb axle? Just help me a bit and get me started. I have no idea where to begin.

Hey all, First off, I'd like to mention that I am completely unfamiliar with this ANSYS and have been fighting with this program for last 2 and half weeks. Any feedback and help is greatly appreciated! Please refer to the photos attached for referral. My project currently involves analyzing...

structural question please HELP! Hi all, new to this physics forum business. I am wondering if anyone can tell me how to find reaction forces in a structure where there is more than two supports. I am familiar with the conventional method of taking the moment about a point to find one...

While programming to find the largest prime factor for a composite number i came across a problem that if the number taken as input exceeds a certain limit, the loop time turns out to be a very long one and some times even resembling the time taken by an infinite loop.The method used for finding...

Structural Analysis-Writing Finite Element Code, Dear all, I have written a code ( in fact it is a software) for 3D finite element structural analysis. While developing the code I found that assembling global stiffness matrix is quite complicated. The complication is even more when we...

I have 2 years left in my Civil BS. I plan to do my emphasis in structural engineering. I am currently enrolled in my schools co-op program and have completed the first of my 3 terms. The office I am working in does environmental work. I am learning allot about project management, communication...

hi community, In general I would like to know the what's the general way of solving the moderate or large-scale eigenvalue or algorithms in structural dynmics. The simple motion equation is as follow. M*d2X(t)/dt2+C*dX(t)/dt+K*X(t) = F(t). The bolded expressions are known before the...

What is the difference between civil and Structural engineering? Some employeers ask for civil eng, but other only request Structural Engineers? I've been told that Civil engineers deal with soil mechanics, geotechnia, surveying and the set up for bridges, roads, etc. But arent they fully...

Structural Analysis-"small deformation" Hi all, Assume a cantilever beam fixed to a wall. We let the beam bend under its own weight. In practice the bending could be significant and as the bar bends, the distance between the tip of the bar and the wall decreases. Now my question are...

Hi all, I need to do a dynamic structural analysis using finite element method and I have a question about the mass matrix. Question: I have the force per nodes and I need to calculate the displacement of each node at a given time. For this purpose, it seems that I need to distribute the...

Hello everyone Just a quick question, hopefully someone could shed some light upon what I'm doing wrong here? I'm using ANSYS Workbench to apply a force to what is effectively a cantilever beam, fixed at one end, with a load applied at the other. To be more specific it is a spring strut of...

Consider the set S defined recursively as follows: • 3 ∈ S, • if x,y ∈ S,then x−y∈S, • if x∈S, then 2x ∈ S, • S contains no other element. Use Structural Induction to write a detailed, carefully structured proof that ∀ x ∈ S, ∃ n ∈ Z, x = 3n. What I've got is since 3 is in the set...

Consider the set T defined recursively as follows: • 2∈T, • if x∈T and x>1,then x/2 ∈T, • if x∈T and x>1,then x^2 ∈T, • T contains no other element. Use Structural Induction to write a detailed, carefully structured proof that ∀ x ∈ T, ∃ n ∈ N, x = 2n. I'm not sure how to...

Hey All, I am familiar with some of the practices of bolted connections between steel plates, or steel beams etc. I am currently facing a design problem at work dealing with a composite metal panel being screwed to a hallow PVC beam. The PVC beam is screwed into a hallow aluminum beam...

200 series aluminum for structural purposes?? Hi Folks, I am sourcing HEX spacers for a strcutural PCB tower. The only alumium spacers I can find that fit the heights I am looking for, are made from 200-T3 aluminum. Previously I went by the rule that aluminum could only be used for...

I just don't get it... still... I don't get it at all... it makes no sense to me... Where can I learn how to read these ? does anyone have any insight as to a guide how to read these or can you explain ? I don't get how structural formula is read...

Homework Statement Several beams of 533 x 210 x 92 kg/m UB section in grade 5275 steel are used to support a composite floor slab. Each beam is simply supported with an effective span of L=6.50 m. (a) During construction, before the floor slab is cast, a temporary concentrated load P kN...

I have a problem in understanding the very basic concept of Structural Analysis. Ironically, I can do the calculations swiftly! But when it comes to theories, I haven't got a clue. So, what is transverse stress, poisson ratio and all that? I know that many people would ask me to go and Google it...

Can you suggest a good book for Structural Analysis that can assist me in my self-study? Thanks a lot.

Hi! I'm looking for information on how one would size a wide-flange beam knowing the live/dead loads and the span required i can't seem to find any calculations for this sort of thing! beam is not composite with floor

ANYS Static Structural, How to simulate 'ground"? Hello all, first post. I'm having trouble simulating a fixed support in only ONE direction. For example, imagine a gigantic frame laid on the ground and you wanted to see the forces deflect from pulling up on one corner, (the ground...

At the moment, I am a first year at BS maths & Physics student. I chose this because i really like Maths and Physics however recently I've been thinking about where i can go with this course. There arent many job prospects, and the jobs do not rly include very high salary. So it looks like I am...

Structural Engineering OR BSc physics&maths!?? i am currently a first year student in BSc Maths and Physics at the university of malta. I've alwyas loved maths and physics, and always have done really well in them. However my main problem is job opportunities i can have BESIDES teaching. can...

20 How many structural and cis-trans isomers are there for dichloropropene, C3H4Cl2. I could find a total of 4, with 2 structural and 2 cis trans. But the answer sheet says 7! can someone tell me all the isomers it can form?

1. demonstrate with a series of sketches that the truss is simple. Find the force in member BE 2. the blurry dimensions: lower lengths left to right: 2 ft, 1 ft, 1ft, 2ft vertical lengths: bottom to top: 2 ft, 1.5 ft, 1.5 ft top length both 3 ft load is 300 lb/ft 3. started by simple inspection...

Tapered cantilever beam with varying depth structural mechanics question help pleas?? [b]1. A tapered cantilevered beam of length 1000mm is fixed at the left end and carries both an upward load 400N and a positive moment (M) at the free right end. The out of plane thickness of the beam is...

Hey, I am currently a sophomore Civil Engineering student, however I'm not sure whether I should be studying civil or mechanical (based off what I want to get into). Basically, I want to specialize at some point in the structural aspect, however, I know each field branches off into this...

http://www.flickr.com/photos/53948823@N08/6193375731/ I need to solve this problem but with member 2 as L+e instead of L, and omit the load.. Since I only see one degree of freedom, i don't know how to set up the matrix to solve for the 3 forces. I have K11 = EA/L + (EA/(L+e))cos2(30) +...

Homework Statement A mild steel beam has a solid square cross section of 100mm and is simply supported by two supports 3m apart. calculate the dead load that can be safely supported when applied to the middle of the beam? Homework Equations The Attempt at a Solution given data...

Homework Statement The Attempt at a Solution for part 1: i figured that this structure is not in static equilibrium. once load "P" is applied, the roller at "D" will function as a fulcrum and ABC will lift (make an angle with the horizontal). is that assumption correct...

Im a junior majoring in civil engineering, and I am considering going to grad school to get a MS in structural engineering. i see that my school requires 36 credit hours for a MS in structural, which is about 12 classes. assuming that i took 2 classes over the summer, could i finish a MS in 2...

C3H6Br2 There are 4 structural isomers possible to draw... which I'd like to do :) The carbon skeleton isn't of much importance here, as we only have three carbon atoms. The two halides, however, are a pain, I've found. The linear sigma bonds may rotate around its axis, meaning that...

to figure out the Ay and Ma reactions, i tried to find the effect of the 9kn/m force. i did this by integrating: integral from 0 to 8: 9x i found this to be 288kn for the moment caused by the 9kn/m force: integral from 0 to 8: 9(x^2) i found this to be 1,535kn*m clockwise i then added this...

I am and have been trying to do a specific simulation for the last several weeks. It seems like I take one step forward two steps back. See below: See the attached files. I'm on Ansys Workbench 13. [PLAIN]www.plastics-consulting.com/rod.stp[/URL]...

There are quite a few canalised streams in my area and I was watching one riparian owner's contractor rebuilding his stream retaining walls. The top 2 metres of these walls were being constructed in 225 (9") dense concrete blockwork, three leaves thick making a total wall thickness of 675...

Is it valid to express KOH in this way (see attached image)? I wasn't sure if structural formulae are applicable to ions. The single bond to me denotes a covalent bond, which isn't applicable to the ionic compound KOH, is it?

Hello, First let me tell you that I'm not so experienced in SAS. I was given a task to find a structural break in labor productivity using the following regression model: Labor_Productivity = Unemployment Oil_Prices Real_Interest_Rates. When I use growth rates, which I was...