# MYSTERY ARCHITECTURE

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1 Science Olympiad Summer Institute MYSTERY ARCHITECTURE Sample List of Materials This list of Materials 20 - #32 Rubber Bands, Brown 20 Small Rubber Bands, assorted size/colors 1 - Roll Scotch Tape 4 5 oz. Plastic Cups 20 Pipe Cleaners, assorted colors inch Bamboo Skewers inch Bamboo Skewers 20 Drinking Straws 5-5 x 8 index cards By Ervin E. Zimmerman Page 1

2 Object To build a device that can be tested in performing a given task. Example Devices Tower Support a given load at the greatest possible height above its base. Bridge Support a given load between two supports the greatest possible Distance (span) apart.. Cantilever Support a given load the greatest possible distance beyond a support. Testing Support a load for the specified time If a load is required it will be available to each contestant while building the device. The load may consist of only the mass of the device. (No load supplied) This is a Pass / Fail measurement. All devices that support the load will be ranked above those that do not. Measurement of device Primary Dimension Used to determine score as specified in task definition. Devices with larger dimension are ranked above those with smaller dimension. Secondary Dimension Used to break ties if two devices have the same Pertinent Dimension. Smallest dimension wins tie. Page 2

3 Simple Structures Square Use 4 pipe cleaners and 4 drinking straws to form a square. Insert the pipe cleaners through the straws and twist them together at the corners. Stand the square on edge and apply a downward force to the top of it. The square deforms easily due to the weakness (in rotation) of the corner joints. Triangle Make a triangle in the same manner using 3 pipe cleaners and straws and test it as you did the square. The triangle won t change shape unless you push hard enough for either a joint or one of the straws to break. Fortunately a 4-sided figure can be changed into 2 triangles by connecting 2 opposite corners together. Add a rigid cross brace to the square and test it again. Now it is much stronger. Remove the rigid cross brace and replace it with a piece of string. Now you can deform the square in one direction easily but not the other. If you connect the remaining 2 corners with another string the square will be rigid in both directions again. By using these principles you can build a larger structure that is strong and rigid. Page 3

4 Analysis of Structures Definitions Joint The place where 2 or more members are connected together. Member A part of a structure that connects 2 joints. Strain The deformation or change of shape that is the result of applied stress. Stress The force applied to an object that tries to change its shape. There are 5 different forms of stress. Bending Stress that tends to deform an object from a straight line. Compression Stress that tends to compress an object together. Shear Stress that tends to make two parts of an object slide past each other. Tension Stress that tends to pull an object apart. Torsion Stress that tends to twist an object around an axis. For our simplified analysis we will only consider bending, compression, and tension. Page 4

5 Towers The object is to support a load at some height above the base. A tower is made up of: Legs or Columns Vertical members Extend from the base to the top of the tower Support the load Need to be strong in compression. Bend easily because they are long and slender. Cross Braces Horizontal/Diagonal members Connect one leg to another Break the legs up into shorter/stiffer members Prevent the legs from bending May be under compression or tension Have very little stress as long as the legs remain straight. Load Cross braces Legs/Columns Page 5

6 Bridges The object is to support a load between two supports. T = Tension C = Compression C C T Load T C T Support Flange Web Support A Bridge is usually made up of two or more trusses which contain: Flanges Horizontal /Diagonal members Transfer the force generated by the load to the supports Top flange is under compression The bottom flange is under tension Need to be strong in compression/tension Bend easily because they are long and slender Web Vertical/Diagonal members Help carry the load to the supports Hold the flanges apart Need to be strong in compression/tension Break the flanges into shorter/stiffer members Keep the flanges from bending Cross Bracing Connects the trusses together Keep the trusses from bending sideways (laterally) Have very little stress as long as the flanges are straight Page 6

7 Cantilever The object is to support a load at a horizontal distance from a support. A Cantilever is similar to a bridge except: The support is in the center of the lever. The is a load at one end of the lever The counterbalance is at the other end of the cantilever The top flange is in tension The bottom flange is in compression Support Counterbalance Load Page 7

8 Joints A joint is where 2 or more members are joined together Butt Joint pieces are joined end to end Butt Joint Lap Joint Pieces are overlapped Lap Joint Pinned/Hinge Joint Pieces joined by a pin Pinned Joint The strength depends on the type of joint and material used to hold it together. You can use Tape to hold butt and lap joints together. When you wrap a butt joint with tape it technically becomes a lap joint. A lap joint can be held together with string or tape used as glue. Strength of Joints Butt Joint Compression Strong Tension Weak Lap Joint Bending Strong Compression Medium Tension Medium Pinned Joint Compression Medium Tension Medium Page 8

9 Materials Before you start building, inspect the materials provided. Try to match their properties to those required where it will be used. Properties Drinking Straws Bending Strong Compression Medium Tension Strong Bamboo Skewers Bending Strong Compression Strong Tension Strong Index cards Compression Weak Tension Strong String Compression Weak Tension Strong Tape Its stickiness is good for holding joints together. Compression Weak Tension Medium Rubber Bands Elasticity makes them useful for holding joints together Compression Weak Tension Elastic Sources of information Great Buildings of the World - Bridges, Derrick Beckett, 1969, Hamlin Publishing Group Ltd., SBN Engineering For Young Scientists, Peter H. Goodwin, 1987, Peter H. Goodwin, ISBN Messing Around With Drinking Straw Construction, Bernie Zubrowski Structures, The Way Things Are Built, Nigel Hawkes Page 9

10 MYSTERY ARCHITECTURE Team #: School: District: Name: Name: Scheduled Time: Do Not Write Below this line Start Time: Stop Time: Primary Dimension: Secondary Dimension: Place: Points: Page 10

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