ACTIVITY_CONSTRUCTION WORKSHOP NAME Madeleine Kilpatrick GROUP MEMBERS Group 3
1_DESCRIPTION (length, width, depth, composition and structural properties) AND PHOTO OF ALL MATERIALS PROVIDED -1200 x 3.2 x 90 mm ply x1 -1200 x 35 x 35 mm pine x3 -One out of the three pieces of pine wood had a large knot, causing a weakness in the pine wood. When a load is applied to an area where the knot is located, the wood is likely to split. The other two pieces of pine had no noticeable defects and is therefore likely to be finishing grade. - Plywood is prepared by bonding veneers together through a combination of heat and pressure. The plywood given did not have any defects, and was very flexible. With these properties, plywood is structurally strong on a plain. -Nails and screws were used to combine the pieces of wood together.
Pine and ply wood
ACTIVITY_CONSTRUCTION WORKSHOP 2_PHOTO AND DESCRIPTION OF ALL TOOLS USED -Sliding bevel for measuring angles -Bench hook for sawing to ensure the work table is not damaged -Power drill used to join thicker pieces of wood. In our case, two pieces of pinewood -Hammer used to insert nails into the plywood and pinewood so that the two are connected. -Saw used to cut the pinewood
Bench hook Hammer Sliding bevel
CONSTRUCTING ENVIRONMENTS ACTIVITY_CONSTRUCTION WORKSHOP 3_SKETCH OF YOUR DESIGN AND PHOTOS OF ALL FOUR DESIGNS
Side view of own design Group 1
Bottom of structure
aerial view of structure
ACTIVITY_CONSTRUCTION WORKSHOP 4_PHOTO AND DESCRIPTION OF STRUCTURAL PERFORMANCE AND FAILURE MECHANISM OF ALL FOUR DESIGNS Group 1
Group 1 did not include any form of bracing, and after the load was applied, both the pinewood and plywood snapped fairly soon after the load was applied. The first crack in the wood occurred in the middle section and as more load was applied, the split extended further along both sides of the wood. The bridge essentially snapped in half as the final load was applied.
The plywood being very flexible, after the load was applied, the wood did not snap. The pinewood split in the middle section only, with both ends staying in tact. The bridge required more bracing to withstand the load, as the combined compression and bending stress caused the structure to buckle. Of all three designs, our bridge was the most successful of withstanding the load, as our structure was the only one to include bracing when designing our bridge.
ACTIVITY_CONSTRUCTION WORKSHOP 5_DESCRIPTION/DEFINITION OF THE FOLLOWING KEY CONCEPTS
Span_ The distance between two horizontal supports of a structure
Cross Section_ In drawing a structure, the cross section is an image of the structure being vertically cut.
Strength_ Withstanding loads and stresses
Compression_ Shortening the material
Tension_ Lengthening the material
Flexion_ Describes how much an object is able to withstand bending
Shear_ In forces, shear forces are opposing forces
Deflection_ A form of bending and can be horizontal (beams and slabs) or vertical (walls and columns)
Buckling_ When the combined bending and compression stress is too high on a thin column, the middle section will snap
Published on Aug 23, 2013