# Materials Presentation 2006

Urban and Civil

Nov 29, 2013 (4 years and 7 months ago)

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Materials Group

Cait Holcomb

Brian Ervin

Zach Jaime

Blake Presson

Our Group at Nucor

Purpose

Our job was to come up with the main
materials that would be required for some
of the major attractions.

We focused our efforts on the
Rollercoaster and the Waterslide.

Rollercoaster
-

Materials

1018 Steel supports, washer plates, nuts,
and bolts

Concrete footers

Urethane coated wheels

Why 1018 Steel?

This alloy is relatively affordable, and it
has good weldability.

The latter is especially important because
the entire frame is welded together.

The maximum yield for this steel is 53,700
psi.

Roller Coaster Cross
-
Section

Mathematical assumptions

For the rollercoaster, the weight of one car
will be approximately 700 pounds.

There will be four passengers per car
weighing a combined 1000 pounds.

The force (F) on one wheel is half of the
total weight.

The total weight equals 1700 pounds and
the force will equal 850 pounds per wheel.

∑F
Y
=0

R
1
-
F+R
2
=0

F=R
1
+R
2

∑M
A
=0

F(l/2)
-
R
2
(L)=0

FL/2=R
2
L

F/2=R
2

F=2R
2

F=R
1
+R
2

2R
2
=R
1
+R
2

R
1
=2R
2
-
R
2

R
1
=R
2

F=R
1
+R
1

F=2R
1

Formula for Reaction Forces

F

L

R
1

R
2

L/2

L/2

1

2

Stress Calculations for
Rollercoaster Tracks

F=850lbs

L=36”

R
1

R
2

L/2=18”

L/2=18”

1

2

F=2R
1

850lbs=2R
1

R
1
=850lbs/2=425lbs

M
1
=R
1
(L/2)/2

M
1
=R
1
L/4

M
1
=425lbs(36in)/4

M
1
= 3825in
-
lbs

σ
=M
1
(L/2)/I

σ
=3825 in
-
lbs(18 in)/28.1 in
4

σ
=2450.18 lbs/in
2

Concrete

We will be using a fiberglass and rebar
composite concrete for the foundations of
both the Water Slide and the
Rollercoaster.

Concrete is strong in compression, and
the addition of both fiberglass and rebar
improve its tensile strength.

Waterslide

Materials

Epoxy coated Fiberglass for slide

1018 Steel for structure

Concrete foundation

What's with the coating?

The Epoxy coating is needed to prevent
the fiberglass from splintering and harming
anyone.

Fiberglass is a light, sturdy material used
in water slides for its ability to be molded
to just about any shape and for its
durability.

Special Thanks to…

Dimos Triantafillu (T.A.)

Daniel Yu (Nucor)

Questions?

(come on, I know you didn’t understand a
single word of that!)