Purpose
Because of the rigidity of a truss shape, it is not difficult to find the familiar triangles in many structures. Designers must accurately determine how much force occurs at locations of a truss design. The designer may change the material, the amount of material, or the number of members in a truss in order to make a design safer or more efficient. The calculations for determining truss forces are also a good basis for calculating forces for many other systems.

Equipment
Straight edge
Calculator

Procedure
In this activity you will make changes to given trusses to make them statically determinate. You will then solve for the outside forces and forces at each pinned connection of trusses.

Static Determinacy
It is important to know that a truss is statically determinate before attempting to solve for the internal forces. If the truss is statically indeterminate, then you will not be able to solve for all of the forces.

The trusses 1, 2, and 3 are statically indeterminate based on the formula 2J = M + R. Use the formula to demonstrate that each truss is statically indeterminate, then sketch a solution that would result in the truss being statically determinate. Remember when you sketch solutions that each should retain triangular shapes in order to remain rigid. J = Number of joints | |

M = Number of members| |
R = Number of reactions within a support| 0r |

*
*
| 2J=M+R(2*40=(5+4)8≠9|

| 2J+ M + R(2*4)=(3+4)8≠7|

| 2J=M+R(2*4)=(5+4)8≠9|

Solving Statically Determinate Trusses
Use the method below to calculate the forces occurring at each pinned connection.

Draw a free body diagram of the entire truss. Label applied forces, known dimensions, and replace supports with labeled reaction forces. Sum the moments occurring about one or more pinned support(s) to solve for reaction forces at supports. There may be occasions when this will not solve any...

...Objective
The objective of the project is to build a truss that would be able to take a specific amount of downward force remarkably with respect to the weight of the truss itself, i.e. to construct a truss that would hold a relatively high efficiency score. And construct the bridge in such a way to as to keep the deflection of the structure at minimal.
Introduction
First of all, what is a truss? In an engineering view, a...

...Institute of Technology |
Planar Truss |
Project 1 |
Engineering Design III – E 231 – Section D – Group 7 | |
11/9/2010 |
“I pledge my honor that I have abided by the Stevens Honor System.” |
Abstract
The planar truss was constructed according to the requirements of the E231 by attempting to support a large load. Three designs were constructed to fit the necessary requirements. The design with the largest...

...Roof Truss Essay
If I was building a 10 pitch roof I would use a roof truss rather than using a rafter. A roof truss is a rigid, strong frame work made up of wood members, such as 2” X 4”s, fastened and held together by metal connector plates. A roof truss consists of one or more triangular units constructed of straight pieces that are connected at the ends by joints. Personally roof trusses are superior due to its number of...

...Truss Bridge
Physics 141
Robin Hoffmeister
There is many reason that we need bridges in every day of our life, from sufficient means to pass over a roadway, waterway, railway, or other structure. You don’t even think about them because it takes no effort to get over them and they are just there for your use. So if you don’t think of them for everyday use I highly doubt that you would think of the physics that is involved in putting one together or the kind of force the...

...HSC ENGINEERING STUDIES
CONSTRUCTION TASK
TRUSS BRIDGE
[pic]
BY RICHY R. THURUTHIYIL
CONTENTS
Common types of Trusses
1- Warren Truss
[pic]
A warren truss consists of alternatively inverted equilateral triangles which are...

...with a simple truss subjected to a loading at its bottom end as would be the case if a constructed bridge was subjected to loadings by cars, trucks, trailers, pedestrians, etc. The set up contained an instrumented truss mounted in a test frame with strain gauges attached to the center of each truss member and a linear potentiometer displacement transducer (LPDT) placed underneath the truss assembly to measure displacement. Experimental...

...x 8 9.81 x 5 9.81 x 4 Load Equivalent(N) 78.48 49.05 39.24
Figure1.1: Finite element Truss Model 1
Figure 1.2: Meshed FE Model
Figure1.3: Meshed FE Model with Load Constraints
2
DISCUSSION Element Type Chosen for Meshing (Link 2D Spar 1): The element used for the analysis of the FE model is the 2D spar 1 of the Link 1 element type. 2D Spar 1 can be used extensively in 2Dimensional and one dimensional truss analysis, link analysis, etc. The Link 2D Spar 1...

...Part 1 – Structural Failure
Cm 220 – Introduction to Structural Design
Due Date 10/03/05
On January 18, 1978, just four years after completion, the space frame roof of the Hartford Civic Center came crashing down 83 feet to the floor after a snowstorm. The majority of the blame for this disaster was placed squarely on the shoulders of the design engineers and architects who overlooked vital miscalculations and failed to fix design flaws when...