Truss Definition and 225 Threads

Homework Statement Hi so I have the following truss: http://screencast.com/t/BIdagRt5abg and I need to calculate the forces in every member by method of joints The Attempt at a Solution So I got the Reaction forces: F(BG) = 25N and F(AC) = 35N Now I'm not exactually sure what to do...

hi all, im having trouble working out the internal forces in this question, i tried before and got stuck working out the forces at joint C. i have been to see my tutor however he is on holiday till after the deadline for this assignment. handy... i was working out the forces by the...

I've had to conduct an experiment with strain gauges attached to each member and when I've calculated the forces in the members I've come out with really large forces in comparison to the applied force.. how does this work out?

I have a little bit of an issue. I am trying to find the reactions on this truss. I know there are x and y at the first and y at the 2nd on the truss. But when I create my moment, do it take the 2500 lb into effect for the rope across the top and side as well? or do i omit those? My...

I've attached the question. I'm not looking for solution just general guidance on how to tackle the question. Do I calculate the internal forces? Where do I put the live load, at node 3 or the midspan of 2 and 3?

Hey. I am currently in an engineering class designing a truss bridge and had a couple questions. (Note all truss members are considered to be two-force members) 1) Suppose the truss is symmetric and a force is applied through the middle of it. Is it normal in industry for any individual...

Homework Statement See attachment. Homework Equations Sum of Fx, Fy, and Moments=0 The Attempt at a Solution A and B are pins, so there is a x and y component at each of these points. Cable has same tension on either side, 1200. Take the moment at A to be zero...

Homework Statement A bridge truss extends x = 214 m across a river (Fig. P12.68) where θ = 35°. The structure is free to slide horizontally to permit thermal expansion. The structural components are connected by pin joints, and the masses of the bars are small compared with the mass of a 1270...

Hi for my design project at uni I am to design a truss crane to a certain spec. I can easily calculate the forces in a truss without the pulley systems. However when I have the pulleys I'm not sure how this affects the forces in the truss. I have the load attached via a 4 cable pulley at the...

Homework Statement Find the Force exerted on member ABCD by the pin at B in figure P4.162 (figure is attached) The Attempt at a Solution This is also attached. As you can see I solved for everything I could. If I could solve for just one more unknown, I could solve the problem. I just...

1. I am an architecture student and the assignment is to design a truss, set up the problem and solve it using graphic statics. I think I did it correctly using the graphical method but I am interested in solving it mathematically. Did I set the problem up correctly in my diagram and if so...

Homework Statement See attachment. Edit: Point A is a pinned connection (has a reactionary force in X and Y direction). Point B is a roller connection (only has reactionary force in Y direction) Homework Equations Sum Fx=0 Sum Fy=0 Sum of Moments=0 The Attempt at a Solution...

Hi I have found out which truss member that have compressive stress, and which have tensile. Now I have to select the metal for each member, I know how to find it when it is simple tensile stress (Sigma=Force/Area) But I think there is another equation when it is compressive stress, or...

Homework Statement Given the weight of a CL-625 design truck (625 kN) on a truss bridge of span 50m, divided into 8 sections (each 6.25 m) with a height of 6.25m making 45deg angles and a width of 6m, what are the tension and compression forces of the members? Homework Equations Mb =...

First time poster, long time reader... Consider the truss bridge as shown in the attached diagram (Each member is the same length) A force of 1000N is applied 3/4 of the way across the bridge. We get: R1 = 250 N R2 = 750 N Resolving from the left we get: T1 = 250 / sin 60 T1 sin 60...

Homework Statement hi all, I've got a simple truss question. Which asks to solve for the member forces. I've learned the stuff in class, but from what I see here, I don't know which joint to start with. With the provided image below, can someone please direct me to which joint I should start...

please see the attached image, I'm supposed to find the internal force in each member of the truss. I used moments to find My=40 and Gy=120, I then moved on to FBD of joint G where I found Fgh=30kN in tension, and Fga=50kN in compression, next I did joint A to find Fab=30kN in tension...

ok this is a basic truss problem and I have to solve every member in the truss(see picture) Basically I started off solving my reaction forces...For the bottom left Pin, i got 8kips goin left, and 9kips acting down...for the bottom right roller I got 9kips acting up. So after working my...

Homework Statement A simple pin-connected truss is loaded and supported as shown in the figure. All members of the truss are aluminum pipes that have an outside diameter of 4 in and a wall thickness of .226. Determine the normal stress in each truss member. Homework Equations Normal...

Homework Statement The problem requires to determine which of the 2 bars has zero axial forces without any computation. Homework Equations The Attempt at a Solution I can't tell which bar has zero axial forces.

Homework Statement The bars in the truss each have a cross sectional area of 1.2in^2. If the maximum axial stress in any bar is not to exceed 25ksi, determine the maximum magnitude of P of the loads that can be applied to the truss. Determine the elongation of each member. E=29,000 ksi...

[PLAIN]http://img109.imageshack.us/img109/3825/truss3.jpg I am having some problems with this one. Can I section the truss through members AB, BE and EF to solve for the force in AB, thus disregarding the fixed connections at left? I suppose I could go join by join, but I would like to...

Can anyone suggest the method to use for solving for the force in member GI in the attached diagram? Is there a way to section the truss?

cannot understand something about this. here are the equations: -T1-T3-T2cos(60)=0 x direction 2T2sin(60)-981N=0 y directionI don't understand why the sin(60) term is doubled in the y direction equation. Can anyone explain?

Hi, I have to design a steel structured truss footbridge. Im using beam anology to determine the correct member sizes. Having trouble determining the maximum design moment (M*) Here's what I have calculated thus far: Q=6kN/m G=1kN/m 50m long, 3m depth, 3.125m spacing Self Weight...

Hi, I have to design a steel structured truss footbridge. Im using beam anology to determine the correct member sizes. Having trouble determining the maximum design moment (M*) Here's what I have calculated thus far: Q=6kN/m G=1kN/m 50m long, 3m depth, 3.125m spacing Self Weight...

Hello all. I am give a pin jointed truss structure. (Look at attached jpeg image) I have a worked solution of: F2*4 + F1*3-Av*6=0 Av=1/6(3F1+4F2)=600kN Ch=F2=600kN Cv=Av-F1=200kN Member forces: S1=-5/4 Av = -750kN S2=-CH=-600kN S5=3/4 Av=450kN S3=-5/4 s4=250kN...

Homework Statement The truss shown is part of an airplane’s internal structure. Determine the axial forces in members BC, BD, and BE. Homework Equations The Attempt at a Solution Ok I am trying to figure out how or where to divide this truss up and forces to draw when I do. I...

I honestly don't know how to approach this problem. I am to find the reactions at C and E. Since E is a roller, it will have moment, but since C is a pin, it won't have moment? What exactly do I need to figure out before attempting to write the equations for the reactions? Do I need to find the...

Homework Statement See figure Homework Equations \sum F_{x} = 0 \sum F_{y} = 0 \sum M = 0 The Attempt at a Solution See other figure. is the FBD for my truss correct?

Hi all, been here several times and found good help for several questions, but this time I'm out of luck, so here I go. Homework Statement By taking a section through the pin-jointed frame as shown, and considering the quilibrium of the structure to either the left or right of the section...

Truss Analysis :( Homework Statement Find the force on each of the members and tell if it is tension of compression. Homework Equations M = fd \sumFx and Fy = 0 The Attempt at a Solution Well, my professor said to us that the first thing to do is to compute for the...

Homework Statement I have a simple truss to analyze using excel. I have done this and know how to do it on pen and paper using one equation to eliminate variables in another until down the line an answer pops out and I go back in and solve for all the other variables. However, this...

In general, in a truss diagram the forces like load, reaction force are act on joints but in this case the load is in the middle of two joints. How can I find forces on members in this case? Your help is really appreciated. Thank you for reading

Homework Statement The attached solution was given as an answer to a simple truss problem in my sophomore level Statics class. We were to solve for the forces in each member of the truss, using the method of sections for FE and BC, and by joints for the rest. The Hibbeler 12th edition we...

Homework Statement This is for a bridge design project. We went for an arch bridge over the roughly parabolic valley. The arch is parabolic and rises 1.3 meters above the deck of the bridge. The deck is divided in 20 sections and supported by both vertical and diagonal members (hollow...

Homework Statement http://itsyourpc.org/sue/files/statics.jpeg Homework Equations please show me the equations. The Attempt at a Solution I am having a very hard time with this.

Homework Statement "Design a bridge over a valley 300m wide. Road surface is supported by a truss underneath." My problem: With calculations Now calculation for buckling says i need to design the truss for compression such that I > (P. L^2) / (pi^2 x E ) or Pcr > P where I = reduction value...

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...

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...

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...