Posted by **Rebecca** on Sunday, June 27, 2010 at 10:49pm.

What is a cross sectional area of a bridge and does it affect the length of a bridge?

- physics -
**MathMate**, Monday, June 28, 2010 at 4:59pm
Generally, first the length of a bridge is determined, and the cross section of the bridge is designed such that it will resist the bending moments, shear forces, and axial forces(if any) exerted on the bridge supporting member.

The longer the span (i.e. length between supports), the higher is the bending moments, so the cross section has to be deeper (taller). To support the increased shear forces or axial forces, the cross sectional area has to be increased.

In addition, the bridge members have to be braced laterally to prevent buckling, a failure that can occur before relatively slender beams are fully stressed.

## Answer this Question

## Related Questions

- Physics - Where do I find the answer of: What affects the length of a bridge, ie...
- MATH - FOUR CYCLISTS A,B,C&D WANTS TO CROSS A BRIDGE BUT DUE TO BAD CONDITION OF...
- maths magic - There are A,B,C,D at one end of the bridge.they have to cross ...
- physics - a train 100m long is to cross a river bridge of length 800m. what time...
- physics - Shyanne (60 kg) has to walk across a single rope bridge to cross a ...
- hw - a train 100m long is to cross a river bridge of length 800m .what time will...
- Writing - How can I end this? ____ The bridge I made a model of is the Sydney ...
- math - The Fred Hartman Bridge allows Texas State Road 146 to cross the Houston ...
- Physics - Train A starts at 4 miles South of a bridge and heads North at a ...
- physics - The roadway bridge over a canal is in the form of an arc of circle of ...