Bridges - bearcubscience

Urban and Civil

Nov 29, 2013 (4 years and 5 months ago)

91 views

Problem:

Which popsicle sticks Bridge Design is
stronger and hold the most weight?

Introduction

When I was younger I went to a bridge
class and we built truss bridges and
learned about lots of other types of
We used popsicle stick and hot glue, and
after words we went out and tested them.
It turned out that mine had held the most
weight. I was wondering if it would do it
again and why. We also got fore extra
sticks to put anywhere we wanted.

Background Information:

A bridge is a structure built to span over a valley, road, water or
other physical obstacle, for the purpose of providing passage
over water

Three types of bridges are: beam bridges, cables
-
stayed bridges
and truss bridges.

There is tension and compression on a bridge.

Compression
-
The act or process of compression

Tension
-
The act or process of stretching something tight
Caisson
-
a watertight, dry chamber in which people can work
underwater

Cable
-

a structural element formed from steel wire bound in
strands

Beam Bridge
-

a simple type of bridge made of horizontal beams
supported by vertical posts

Pier
-

a vertical supporting structure such as a pillar

Cantilever
-

a projecting structure supported only at one end
bending

Longest suspension bridge in the world is the Akashi Kaikyo
Bridge

Hypothesis:

I predict that the bridge with the six extra
sticks will hold more weight than the one
without the six extra sticks because the
one with the six extra sticks distributes the
weight better.

Materials

Paper

Popsicle sticks

Hot glue gun

Weights

Dog leash

Saw horses

Rocks

Procedure

1. Gather all materials.

2. Make the two different bridge designs; Truss
bridges

3. Test the two different types of bridge
designs.

4. Use saw horses to put the bridge on.

5. Put a lease on the bridge to hold the bucket.

6. Put white rocks in and see how much it hold
until it breaks.

7. Record the results and how much they held.

8. Clean the mess up.

Independent Variable

Which bridge designs is better? Two
types of trusses (one with more sticks
than the other in the design)

Dependent Variable

How much weight each bridge will hold?

Controlled Variable

I will make the two bridges out of the
same materials, same glue and test
them both the same.

Results

Test Bridge: 6.8 pounds

Bridge with extra sticks held: 16.6 pounds

Bridge with no extra sticks held 9.8 pounds

I found that the bridge with extra sticks held
more weight then the other. It also broke in more
spots then the other bridges. I think why it broke
in more spots was because the weight was
distributed better and used more of the sticks to
hold the weight.

Conclusion

Next time when I do a test on other types
of bridges I will use the same amount of
sticks and try harder on getting the glue
the same amount on each bridge.

Major Observations

I really observed that when it started to
crack and break, they all twisted in the
middle but none of the sticks broke.

Possible Applicants

This could help people who design
bridges. They could see where a bridge
needs to be stronger. Like on my bridges
they both could be stronger in the middle
and with more glue.

Possible Causes of Error

I did not build them on the same day and my
mom helped me build some of them.

Sticks not in the same area.

Glued in different spots and not the same
amount of glue.

Some of the sticks were not stick were not glued
securely.

The rock piled differently each time.

The way the bridges were placed on the saw
horses.

Further Research

In the future I think it would be fun to test
different types of bridges and with different
materials.

Time Spent

Sept.3=45

Sept.4=45

Sept.14=45

Sept.15=45

Oct.28=45

Oct.29=45

Oct.1=45

Oct.2=45

Oct.13=45

Nov.9=35

Nov.10=45

Nov.11=10

Nov.12=5

Jan.4=45

Acknowledgements

I want to think my mom for helping me
build my bridges and for getting the bridge
book so I could build the bridges.