Force distribution on a K-Truss

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Discussion Overview

The discussion revolves around the design of a K-truss bridge for a physics project, specifically focusing on force distribution when loaded from the center. Participants explore various resources and methods for analyzing the forces acting on the truss members, including software recommendations and manual calculations.

Discussion Character

  • Exploratory
  • Technical explanation
  • Homework-related

Main Points Raised

  • One participant seeks diagrams or software to visualize force distribution in a K-truss bridge loaded from the center.
  • Another participant suggests using the Johns Hopkins Bridge Designer page as a resource for force distribution analysis.
  • A different participant proposes creating a drawing of the truss and performing manual calculations to determine force distribution.
  • One participant mentions a website that offers jigs for building trusses out of toothpicks, which could be useful for practical experimentation.
  • Another participant discusses the benefits of using a K-truss design, noting its ability to provide resistance at mid-span where maximum bending moment occurs.

Areas of Agreement / Disagreement

Participants generally agree on the utility of K-truss designs for distributing forces effectively, but there are multiple suggestions regarding resources and methods for analyzing the force distribution, indicating no consensus on a single approach.

Contextual Notes

Some limitations include the lack of specific details on the materials being used for the bridge and the absence of established force diagrams for the K-truss under the specified loading conditions.

Who May Find This Useful

This discussion may be useful for students or hobbyists interested in bridge design, particularly those exploring truss structures and force distribution analysis in physics projects.

OpenLaszlo
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Im working on a design for a physics project where I have to build a bridge to span a length of about 50 cm. I've looked at some different truss designs and I've decided that I want to do a K truss- I've read that it distributes force more evenly when loaded from the center (which is where mine will be loaded from), however, I haven't been able to find any type of force diagrams detailing exactly which members will be undergoing compression or tension. Does anyone know of any software or diagrams which can show me where the force distribution on the bridge would be if loaded from the top center?

By the way, sorry if this is in the wrong section of the forum
 
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Johns Hopkins has a Bridge Designer page (sorry, don't know the URL) that will give you exactly what you need.
 
You could always do a drawing of the truss with the desired dimensions and the location of the load, and do the calculations yourself. If not, there are applicatiosn such as Risas which can help you calculate it.
 
I'm not sure what you are building the bridge out of but you should check out www.twigjig.com.

The site has jigs that you use to make trusses out of toothpicks. You are able to make several different truss patterns. Very cool stuff
 
heyy dude good goin with the selection for K-Truss since if u consider a SSB(Simply Supported Beam) for the bridge span Because at mid-span there occurs maximum bending moment. if considered W is the weight acting at mid span so B-M is (WL/4) where L is ur Span of the bridge which is 50 cm so selecting a K-truss helps you to offer more resistance at mid-span so as making your bridge sustainable and increasing ur load carrying capacity.
Any more Query send me ur Questions to raul_o_conner@yahoo.com
 

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