# How strong should a bridge be?

## How strong should a bridge be?

The prototypical bridge is quite simple—two supports holding up a beam—yet the engineering problems that must be overcome even in this simple form are inherent in every bridge: the supports must be strong enough to hold the structure up, and the span between supports must be strong enough to carry the loads.

What type of bridges can hold the most weight?

The arch bridge can hold the most weight of the three, the deck truss bridge can hold an average amount of weight, and the beam bridge could hold the least amount of weight. This experiment tested the arch, deck truss, and beam bridges to see which could hold the heaviest amount of weight.

### How do you make a strong bridge out of straws?

Place a straw along the bottom of the four triangles and secure it by placing a piece of tape around the straw and the center of each triangle. Repeat for the other set of four triangles. Tape together two straws if one is not long enough and trim away the extra length on the ends.

How do bridges stay up?

They do it by carefully balancing two main kinds of forces called compression (a pushing or squeezing force, acting inward) and tension (a pulling or stretching force, acting outward), channeling the load (the total weight of the bridge and the things it carries) onto abutments (the supports at either side) and piers ( …

#### What makes a bridge stronger?

Suspension bridges work by using a force called tension. Tension is just pulling something tight. Suspension bridges are strong because the force on the bridge gets spread out. The weight of the cars or trains or horses, whatever’s traveling across it, pulls on the cables, creating tension.

What is the simplest bridge to build?

Beam Bridge
Beam Bridge A beam or “girder” bridge is the simplest and most inexpensive kind of bridge. According to Craig Finley of Finley/McNary Engineering, “they’re basically the vanillas of the bridge world.” In its most basic form, a beam bridge consists of a horizontal beam that is supported at each end by piers.

## What bridge designs are the strongest?

Even though the truss bridge design has been around for literally centuries it is widely regarded as the strongest type of bridge.

What kind of bridge is the strongest?

An arch bridge is stronger than a beam bridge, simply because the beam has a weak point in the center where there is no vertical support while arches press the weight outward toward the support.

### How do you make a bridge out of paper clips and straws?

Try It Out

1. Cut two short pieces of straw, each 3 centimeters (about 1.25 in.)
2. Tape one tower to the edge of a desk or chair.
3. Place another straw between the towers so its ends rest on the short pieces.
4. Make a load tester by unbending a large paper clip into a V-shape.
5. Now change the beam bridge into a suspension bridge.

What makes a bridge strong?

#### What part of a bridge has to be the strongest?

Strength. An arch bridge is stronger than a beam bridge, simply because the beam has a weak point in the center where there is no vertical support while arches press the weight outward toward the support.

How do you count pennies on a Paper Bridge?

After kids make some guesses, lay the sheet of paper flat across two books placed 20 cm (about 8 in.) apart. With the kids keeping count, place pennies on the bridge, near the middle, until the bridge fails. (It will hold only a few.)

## How can I increase the amount of pennies a bridge can hold?

Try changing the geometry of your bridges, adjusting, for example, the width of the bottom or the height of the walls or the number of times you fold each sheet in half. How does changing the shape affect how many pennies the bridge can hold? You probably found that paper made the strongest bridge.

How much does a 50 Penny Bridge weigh?

Here are the results of the file-card bridges that the Science-at-Home Team built. A roll of 50 pennies weighs 132 grams-that’s a little more than 41/2 ounces. How many kinds of bridges are there?

### How do you make paper strong enough to hold pennies?

Folding the paper in half may have made it strong enough to support a few pennies. The more times you folded the paper in half, the stronger it got. Changing the shape of the bridge to give it vertical “walls” made it significantly stronger, and it could probably hold dozens of pennies.