1. How to Handle the Stress part 1
When you add a load or weight to a structure it creates stress on the materials that weaken or even break it apart.
There are 5 types of stress you must plan for when building a structure:
1. Compression Tension Bending Torsion Shearing

2. Compression will create the greatest stress on the middle of the beam
Compression will create the greatest stress on the middle of the beam. The steel cables are under tension stress from the weight of the road and cars pulling on the cables. If shearing occurs on the edge of the bridge the road will tear away from the land it is attached to.
bending

3. How to Handle the Stress part 2
Trusses have been used for centuries to help construct things like bridges homes and large buildings. Trusses or cross braces are strong and lightweight shapes. It offers strength to handle stress from tension, compression, bending and shearing. Trusses have solved many construction challenges.
A single beam can easily bend. However, if beams are joined together they are much stronger. The strongest frames form triangles. This is called a truss or a cross brace. A triangle is the hardest shape to twist or bend. Today, trusses are still used in a wide variety of buildings. They are used in tall skyscrapers and hold up most of the roofs in our houses, stores, offices, and schools.

4. How to Handle the Stress part 3