Truss Definition and 240 Threads

Hi, I am a PhD student in math and in my current research I'm faced with the problem of analyzing the rigidity of a structure of rigid beams in 3D, that is if the structure can move. In particular, something like this: http://img525.imageshack.us/img525/1545/98322092.th.jpg where all...

Homework Statement Hi guys, Below is a picture of what I am given. I need to calculate the support reaction forces and the stress in each truss. Having problems resolving the offset weight. Homework Equations All the supports are pin supports. Any ideas how to get started? The...

Ok, I've had a shot at this problem we've been given in MATLAB. Though I'm very new to physics forums. I've attached the actual problem and also a few of my equilibrium equations. I've written out the matrice in MATLAB but I'm guessing its incorrect as the answer I'm getting in Matlab...

Hi all, I've been looking at a few trusses lately and was wondering what the main factors are that influence the overall strength of a truss bridge? I have an idea that the more members taking loads, the stronger the truss, hence members should be at sharper angles. Of course i could be dead...

simple truss question...driving me crazy! =/ Homework Statement the question wants the forces in all the members of the truss. i have found that members bc and ef are zero force members...i cannot find the others. I am at a loss because I've tried all the methods i have been taught and the...

All things considered equal, would one of these truss structures be stronger than the other? Consider all heights equal, load equal, arms dimensionally equal, etc.. Just going off the angle difference of the triangles. Oh... if there is a difference in strength, how can you calculate that? Is...

Truss urgent Help Homework Statement We must design a truss bridge that we will then build from spaghetti. The chosen design is a warren with vertical supports. It has 20 Joints and 37 members. (Bridge is 64.8cm long and 10.2cm high) Homework Equations I am trying to calculate the...

Homework Statement http://g.imagehost.org/0110/nub.jpg Total tank weight (with liquid) is around 3.1kips Lateral load on wall is defined as 6kips[1-(Faxial/6kips)]^2 Faxial is defined as the axial force along a wall -- maximum allowable is 6kips Maximum allowable force in any truss member is...

Hello, I have a test after 4 hours and I really need to know how to solve this :S I tried my best and threw 4 pages of scratch papers already ! Please help me... I know I am doing it wrong, I tried and tried but it did not work .. I am really frustrated I feel like I am going to fail the test...

Pratt Truss Analysis :( Homework Statement Hello, first post here. Been given an engineering assignment for school but not quite understanding how to answer all these questions. Homework Equations Was told to use Method of Joints for the reactions on left and right. And Method of Sections on...

Homework Statement Determine the forces in each member of the truss shown. Also find the values for any reactant forces http://img201.imageshack.us/img201/6853/trussnu9.jpg Homework Equations Fx= 0 Fy= 0 The Attempt at a Solution I set θ in the corner of J1 tan θ=12/16 θ =...

Hi there! Can anyone take me through the method of joints procedure for this truss? I am having trouble working out the reaction forces at the pin at joint A. Is there supposed to be a vertical component to the reaction force as well a a horizontal (seeing as it is a pin)? And if so where...

Homework Statement The symmetrical scissors truss is supported at point A and D. The support at D is a rocker bearing and does not produce a horizontal reaction. A, B, C, D, E, & F are pin joints. The members of the truss are not joined to each other where they cross. At A, the angle...

The space truss showin has compression and tension forces acting in the members as shown. Force F is 10kN, determine the three unknown forces (F1, F2 and F3). I know that it should be the summation of Fx, Fy and Fz, however for F1, there is no reaction force, so I don't know what to...

Homework Statement member AD of the timber truss shown (attached) is framed into the 100 X 50 -mm bottom chord ABC as shown (attached - detailed view). determine the dimension 'a' that must be used if the average shearing stress parallel to the grain at the ends of the chord ABC is not to...

[PLEASE HELP!] Forces in members of a truss Homework Statement A barrel vault truss is loaded as shown. Knowing that the length of the bottom chords DF, FH, ..., and QS is 3 ft, determine the force is members IK, JL, and JM. http://img68.imageshack.us/img68/4817/fyjfhjfgjhfghgx8.jpg...

Im doing this problem as a part of the experiment for a Basic Roof Truss. I first started off measuring the deflection for each member of the roof truss (member dismantled from the roof structure) by applying certain amounts of weights. Next I put all the members up into a roof structure as...

Hello all, first post. I have a mechanics test coming up and a the lecturer gave a very strong hint that a question like this with a scissor truss will be on the exam so how would you go about solving a question like this (finding force in all members). I worked out the reaction forces as...

Homework Statement A 4000lb uniformly weighted crate is attached by light inextensible cables to the trus show below. Simply determine the reaction at A and E of the truss show below Figure 1 attachment Homework Equations I used the Moment arm equation of M = F*Distance The Attempt...

Homework Statement Determine the force in each member of the truss shown. Homework Equations \SigmaFx = 0 \SigmaFy = 0 \SigmaM = 0 The Attempt at a Solution I divided up the truss into different systems, the whole truss, and then a system for each pin. I must be doing something...

Homework Statement I spent a few hours trying out this question, so I probably need help. This is a seven pin-jointed structure mounted on the wall, with the following information given: 1) S1 and S2 are wall supports, but S2 is assumed to have no friction with the wall i.e. no vertical...

Homework Statement please find it attached as pdf. Homework Equations joint method was conducted. The Attempt at a Solution please find it attached. i spent so much time on this and i took statics like 1.5 years ago. can you help me find my mistake? i can't seem to find why...

Homework Statement Hi, I have to build a Popsicle Stick bridge for Physics class. I really don't have much knowledge on bridges as most of this was to be researched. I did a lot of research but I'm having trouble deciding between these two trusses. Restrictions/Requirements: Length: 55 cm...

Homework Statement Determine all the member forces in the truss shown below, and identify tension/compression for each member. I know there was more to what I was supposed to put here, but I really only have a terminology question. I know that I have to determine all of the reactions...

Homework Statement Help required please. Method to be used is resolution of forces. thanks, sharifullah. Homework Equations The Attempt at a Solution

I mainly am having trouble accurately calculating the force on members in a truss. The reason being is sort of common, my teacher skimmed through the lecture on these calculations, and left the entire class in a fog. I've made my best attempts at researching on the Internet, but so far no real...

How will I calculate the forces involved in a truss and suspension bridge, my teacher did not explain this fully and I'm confused as hell.

Homework Statement Ok, you'll have to wait for my picture. Basically we are doing trusses, and I'm not sure where I'm going wrong here. We are to find the tension/compression in each member(line) of the truss. Ok, from my picture. F1 is directly at B(in neg y direction), and is...

How would you begin to analyze a truss of this style? The picture I posted is the situation given. Say you want the force in the green member and the pink members given loads 1,2,3. If the pink members can only act in tension, where you begin? For those who may not know, the support on the...

I need to find all the zero force members, and solve for the other members. I am at school right now but I can definantly tell AB and AC are zero force members. When I get home I will see what else I can come up with. Also I cannot remember how to get the angled trusses Also All 3 downward...

Hi Guys, I am having trouble determining the zero force members in the truss below. I am planing to use the method of joints to solve for the forces in the beams. So if I knew the zero force members it would be easy.

Okay, I have uploaded the question to imageshack because it would be to difficult to understand the question without the diagram. Basically, I've done a lot of work on it and know I'm on the right track. If someone could point out where I have made a mechanical error it would be greatly...

fig 6-12) Members AB and BC can support a max compressive force of 800 lb. and members AD,DC and BD can support a max tensile force of 1500 lb. If a=10 ft determine the greatest load "P" the truss can support. My dear friends! the above truss question has become a headache for me. I...

Hello, I'm having trouble with a truss analysis problem. We are supposed to use the method of joints & the method of sections. We have to find all the external reaction forces and internal member forces. The method of joints is not problem, and I THINK I'm doing the method of sections...

truss problem, urgent help! Hey guys i need help with setting up this truss problem 6.30 which can be seen here, http://www.mustangmods.com/data/16002/study1.jpg I know the stress in bc is 10.4ksi (tension) and that the safety facotr for it from 1020 steel is 4.038, I just need help...

Gday guys, Im having trouble finding the forces in this truss. I feel really stupid, I should be able to do this. Can you guys give me a hand starting off? Cheers. :blushing:

The question is stated below. I found out an answer but it doesn't seems to be correct to me. I made a few sketches to clear things up a bit, sorry for bad quality, too much compression. The simple truss of Prob. 4/2 is modified as shown in the figure, in that the angle of the support surface...

I'm having problems with truss. Is there like a simulation or animation which shows me how the forces are being transfered. I need to mentally visualize what's going on before i start to calculate. I'm doing really bad.. need help~ i'm going over truss by cutting and by piece or frame ..

The diagram for this quesion is at http://www.drewtemp.com/helios/physics.gif The first thing that i did was that i made the free body diagram. From my knowledge i would say that AB and BC are in compression and AC is in tension (i think that is correct). Now the question asked to take...

The diagram for this quesion is at http://www.drewtemp.com/helios/physics.gif The first thing that i did was that i made the free body diagram. From my knowledge i would say that AB and BC are in compression and AC is in tension (i think that is correct). Now the question asked to take...