bridge design project Quentin Rahimi Period 5

All types of bridges Beam bridge Arch bridge Truss bridge Suspension bridge

Beam bridge This would be an example of a beam bridge. For this kind of bridge its compression at the tip and tension at the bottom to level or even it out.

Arch bridge This would be an example of an arch bridge. For this kind of bridge, weight at the top goes and runs off to the sides, for example if it was made of stone it would have great compressive strength because it compresses at the ends where the weight runs off.

Truss bridge Here would be an example of a truss bridge. For this kind of bridge compression starts from he top and the other bars on the sides cause tension on the compressed bars on the top and tension at the bottom of the bridge with gravity pulling it down.

Suspension bridge Here is an example of a suspension bridge. This kind of bridge works because the suspenders are under tension, cables are under tension, towers are under tension, causing the anchorages under tension.

The 4 forces a bridge must withstand One of the forces a bridge must withstand is Compression. Compression is a pushing kind of force. For example if you have a small piece of wood it can hold more than the longer piece of wood. Because the shorter piece can hold more compression than the longer piece. Another force a bridge must withstand is tension tension is a pulling kind of force. It would be hard to pull a popsicle stick from both ends because of tension is strong.

The 4 forces a bridge must withstand Another force a bridge must withstand is torsion. Torsion is a twisting force. For example if you take a pretzel stick and twist it, it will break. But if you take licorice it wont break as easy because it has more capability of standing against torsion.

The 4 forces a bridge must withstand The last force a bridge must withstand is shear. Shear happens when two opposite forces act in the same point. For example if you take a popsicle stick and push up with one hand and down with another that’s shear.

7 loads bridges must be able to withstand : Dead loads : Imposed/live loads : snow,rain,ice loads : Wind loads : Seismic loads : Corrosion loads : Transient loads

Dead loads and live loads A dead load is the weight of a vehicle or structure excluding the weight of passengers or goods. Live load The weight of people or goods in a vehicle or building.

Snow,rain,ice loads Wind loads The amount or kind of weather on a vehicle or something The wind resistance causes a load

Seismic loads Is a basic concept of an earthquake generated agitation to a structure

Corrosion loads The deterioration of a material and as it reacts with it environment and if it can withstand it.

Transient loads Are only applied to the pipe for short times