1. Organized by: Department of Civil Engineering Sponsors: 31 st May to 3 rd June 2010

2. Structural Topic The goal of the project is to design a transformable bridge-like walkway consisting of two half-circles, which can be connected to form both an S-shape and a circle of the walkway. Both configurations will be tested and assessed. The fabricated model must follow the structural design report submitted. Non-compliance with the instructions and use of materials not provided by the organizer will lead to disqualification.

3. Grand Challenge (S-Shape walkway) An example of timber structural model of the bridge walkway.

4. Geometric Requirements Plan view of the S-shape walkway and circle configuration with dimension and clearance requirements. Plan

5. Geometric Requirements Horizontal view of a part of the walkway with dimension and clearance requirements.

6. Geometric Requirements for Loading Horizontal view of the end of the walkway with load application and clearance requirements. Elevation

7. Material and Tools Materials  Balsa wood slat (15 pieces for each team) with dimension of 1mmx75mmx1000mm  Nylon cord (maximum 3 meters for each team) with diameter of 1 mm.  Adhesive (UHU Hart Balsa cement)  Screws (Aluminum, M6) Note: Screws can be used to fix one of the columns and they are not allowed inside the structure. Tools  Ruler, triangle ruler, protractor, compass, pencils, cutter knives, sand papers, scissors. Note: Installation of tools in the structure is not allowed.

8. Structural Requirements The transformable bridge-like walkway has to be fabricated using wood slat, adhesive and, optionally, nylon rope. The structure must consist of two half-circles, which can be connected to both an S-shape and a circle of the walkway. The two parts must be detachable from one another so that both configurations can be tested and assessed.

9. Structural Requirements Maximum three columns are allowed to support the walkway. The type of structure is not specified and not limited but clearance requirement must be satisfied. Only one of the columns will be rigidly connected to the ground. This column will be fixed to the base by two or four adjustable aluminum brackets. The cross-section of the built-in column must be rectangular over the first 50 mm from the ground. The bases of the remaining columns are only provided with supports for only horizontal and compressive forces.

10. Clamped Support Base construction for clamped column. Plan

11. Clamped Support A typical connection at the bottom of the clamped column.

12. Simply Supported Base Base construction for non-clamped columns. Plan

13. Other Requirements The model may be limited to the load- carrying components. The following parts should be properly designed for load application:  The longest free end of the walkway in the S- shape configuration  The sections in the middle of the longest span between the columns in both the S- shape and circular-shape configurations.

14. Load Tests Both the S-shape and the circle configurations of the model are tested. Load testing will include both static and impact loads applied in vertical direction:  The longest free end of the walkway in the S- shape configuration  In the middle of the longest span between the columns in both configurations. The static load tests will be carried out first and those models that pass static tests will be admitted to the impact load tests.

15. Loading Apparatus Loading constructions. Elevation

16. Load Tests Static load test  The model will be loaded incrementally with three masses of 2.0 kg each.  The final mass is 6.0 kg plus the mass of the load-carrying construction.  The displacement limit is l/100 for the load between two columns and l/50 for the load at the end points of the walkway. Where, l is the distance between the load point and the axis of the next column, measured along the axis of the walkway.  The test will be terminated upon collapse of the model. Impact load test  The final mass of 6.0 kg plus the mass of the load-carrying construction remains unchanged.  Then, the upper mass segment of 2.0 kg is lifted to a height of 80 mm above its idle position and suddenly released.  The test will be considered successful if the model does not collapse within the first 10 seconds after application of the impact load.

17. Tentative Schedule for GEM1505C TimeEvent 16 th or 17 th March 2010Submission of the design report 23 rd or 24 th March 2010Fabrication of the S-shape bridge 30 th or 31 st March 2010Fabrication of the S-shape bridge 6 th or 7 th April 2010Testing of structure 13 th or 14 th April 2010Testing of structure 1 st – 4 th June 20106 th Inter-University Invitational Civil Engineering Competition

18. Model appearance  The model appearance is focused on the design idea, innovation, proportion and elegance, realistic layout, and technical elaboration of the construction. Structural behavior  The marks are collected step-by-step during the tests.  The lightest model which satisfy all static load tests will be awarded 25% marks. Load to weight ratios will indicate the rank the larger L/W will get 1% point less consecutively but not less than 13%.  The lightest model to satisfy all impact load tests will be awarded 25% marks. Load to weight ratios will indicate the rank the larger L/W will get 1% point less consecutively but not less than 13%. Those passing the impact load test will receive higher marks than the failed ones. Assessment

19. Grand Challenge (S-Shape walkway) An example of timber structural model of the bridge walkway.