Statics Lesson 51 | How to Solve Trusses Faster: Method of Sections Tips and Tricks

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Physics

Ready to solve truss problems in half the time? In Lesson 51 of engineering mechanics, we are looking at pro truss tips and tricks for the Method of Sections! I am sharing three ultimate game-changing hacks that will save you precious minutes on your next exam.

First, I’ll show you how to completely SKIP calculating global equilibrium and support reactions by strategically picking the unsupported side of a wall-mounted truss. Next, you’ll learn the expert trick of taking a moment off the Free Body Diagram (FBD) at a virtual point. Finally, we will use the equation system solver on our calculator to solve dual equilibrium equations ($\Sigma F_x=0, \Sigma F_y=0$) instantly without manual algebra. Think with your brain and master these statics shortcuts!

Timestamps:

00:14 – Introduction to advanced truss tips and tricks

00:24 – Analyzing a wall-mounted cantilever truss problem

01:41 – Trick 1: How to SKIP global equilibrium to save time

02:37 – Calculating FBD member angles ($45^\circ$ and $18.42^\circ$)

05:02 – Trick 2: Taking a moment off the FBD at a virtual point

06:28 – Solving for member BC using the moment trick ($\Sigma M_E = 0$)

07:44 – Setting up the X and Y direction equilibrium equations

10:19 – Trick 3: Using the Calculator System Solver for fast answers

11:07 – Final answers for members BE and FE (Tension vs. Compression)

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