- #1

mathsgeek

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**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 forces and need to determine if it is statically determinate using the equation 2J=M+R but the thing is that we will just place the bridge (won't be fixed to it) on blocks at each end and the rest will be resting on nothing. Will that mean R = 2 because of only 2 reactions forces being vertically upwards? if it is, that means 40 = 39 which means it is statically indeterminate and where do i go from there? Also, do i use the method of joints or sections to calculate the forces in each member as i don't know which is better/easier to use/best for a structure that is structurally determinate etc? Thank you (Please answer asap as urgent)