1 PRESTRESSED CONCRETE Bridge Assignment 2016 1. PROJECT EXTENT Design and draw the specified structural elements as listed below for a new bridge over Sturt Creek, Mawson Lakes. The bridge will be formed from prestressed concrete using Super T profile beams and a reinforced concrete deck slab. This project is worth 20 % of the final course assessment. You are required to work in the same groups as you did for the design project. Please note the initials of the student responsible for particular calculations on each page or include a summary of how you distributed the work between the students in your group in your final report. 2. BUILDING CONSTRUCTION a. Bridge Deck: The bridge deck will be constructed of reinforced concrete with NO post tensioning. The deck will support the following dead loads - 150mm (minimum) bitumen for the lanes - 200 mm of pavers and base course for the pedestrian path b. Bridge Span: The bridge will be used in various locations around Mawson Lakes so the bridge needs to be designed for various spans and vehicle speeds. Each group will design a different span and vehicle speed. See the table below for which span you will be designing. c. Other Loads: You will need to design the bridge for vertical loads only. In practice, you will need to consider the lateral loads arising from wind and earthquake loads plus other loads such as braking and impact loads. We will NOT be designing for these additional loads cases ie design for vertical loads only. 3. CODES Loads AS 5100 – Bridge Design Design AS 3600 - 2009, Concrete Structures AS 5100 – Bridge Design Reinforcement Handbook – ARC Structural Systems – Prestressing Technology book 4. DESIGN METHOD You will be using SpaceGass to model and to analyse the loads on the bridge. However, you will need to determine an approximate slab and Super T beam as a starting input into SpaceGass. This will be completed by preliminary hand calculations. Using the maximum bending moments and shear force diagrams from your SpaceGass model for the critical Super T beam, you will undertake hand calculations to design the ultimate design capacity of the slab and bridge beams and also undertake hand calculations for the short term deflection of the bridge. 2 5. ADDITIONAL DESIGN INFORMATION You will need to determine the maximum loading on your bridge. Use AS5100 to determine the maximum vehicle on the bridge and a time interval between vehicles of 1 second. As a starting point, you can assume that under each lane we will position one Super T beam. This can be changed to suit your particular span and loading. The lanes will be 3.2m wide with the RC deck slab spanning on top of the Super T beams. The concrete deck slab will be a minimum of 200mm thick to allow for fixing of the handrails, crash barriers etc. Use the following information to select a concrete strength and determine the cover requirements for your bridge: - The bridge must have a design life of 50 years. - The bridge will have no coatings to the underside of the bridge and ONLY the bitumen to the top surface. - The bridge will be supported on bridge bearings at each end which will result in zero bending moment being transferred to the foundations. Assume a concrete density of 24kN/m3 and a bitumen density of 20kN/m3. A handrail will be placed at the edges of the bridge. The self-weight for this will be 0.5kN/m. Although the Super T beams and the bridge deck will be horizontal, the road will have a dual cross fall of 3% to the kerb and gutter on each side of the bridge i.e. ridge in the middle falling to outside on both sides. 5. DRAWINGS The drawings should summarise your design, but remember they are design drawings not reinforcement scheduling drawings, hence only critical member dimensions, bar sizes, numbers, ligature spacing etc are required. However, you should follow the conventions for reinforced concrete detailing (see reference) and show strand details i.e. layout and other conventional reinforcement etc. 6. REFERENCES Warner RF, Faulkes K and Foster S, Prestessed Concrete, 3rd edition, Pearson Education Australia, 2013 Concrete Institute of Australia (2010), Reinforcement detailing handbook for reinforced and prestressed concrete: based upon the Australian Concrete Structures Standard AS 3600-2009 7. PLAGIARISM AND PROJECTS Plagiarism is a specific form of academic misconduct and deliberate plagiarism is regarded as a serious act of academic misconduct. For a more detailed explanation of plagiarism and how to avoid it, please refer to http://www.unisanet.unisa.edu.au/plagiarism/ With regard to this design project, and any other group assignments, plagiarism can be difficult to define. Within the profession of engineering, working in teams is the normal means of operating, and group projects and assignments are partially designed to give students experience in this process before they enter the workforce. When undertaking the design project, you are encouraged to work very closely with your group members, and also to discuss issues with other groups working on the project. However, each project submission must be the independent work of that group. Hence, plagiarism in projects is quite easy to detect, and any such submissions in this course will be penalised in assessment in accordance with the academic misconduct policies of the university. 3 8. PROJECT PRESENTATION The project shall be presented fixed inside a folder (not plastic sleeve display folder) or binder with your names on the front cover and shall consist of:  Disclaimer that project is your own work (i.e. all group members)  Index  Calculations  Drawings on A3 or A4 sheets. 9. PEER ASSESSMENT At the end of each submission, you are required to assess yourself and your group member using the online peer assessment tool SPARK. You are required to answer each of the criteria questions and provide written feedback of at least 10 words for each group member for each submission stage of the design project. The RPF score from SPARK will be used to modify your groups mark to give you an individual mark for each submission stage of the design project. Please note that marks have been allocated for the group to successfully complete this peer assessment. If any of your group members fail to complete this peer assessment fully within the allocated time frame, your group will receive zero marks for this part of the assessment. 10. COMPLETION DATES The Bridge Assignment shall be handed in completed or otherwise, by: 4.00pm on Friday, 10th June 2016. Projects will not be accepted after the due dates unless some acceptable extenuating reason is produced, e.g. sickness (supported by a medical certificate). MARK ELLIS 4 Group Number Group Members Bridge Span (m) Vehicle Speed (km/hr) 1 Stamatis Hayden Luke 15 60 2 Mustafa Tim Nick 15 80 3 Xavier Ernie Jacob 15 100 4 Xian Tian Chun Yin Darcy 16 60 5 James Ben Scott 16 80 6 Ting Long Ho Kei Yat To 16 100 7 Daniel Luke Chiu 17 60 8 Xing Yuan Zicheng Longquan 17 80 9 Mohammad Chelsea Mikey 17 100 10 Kieren Trent Nathan 18 60 11 Daniel Marko Najibullah 18 80 12 Mustafa Brodie Michael 18 100 13 Will Tyson Jordan 19 60 14 Joynal Dang Renyu 19 80 15 Catherine Justin Boon 19 100 16 Ali Naga Praveen Hassan 20 60 17 Mossy Adrian Mortadha 20 80 18 Jiawen Haiyang Molyvan 20 100 19 Cameron Kazim Michael 21 60 5 BRIDGE ASSIGNMENT - due 10th June 2016 Item Allocated marks SpaceGass - Input  Determine required concrete strength and minimum cover  Coversheet for the SpaceGass model  Model the bridge in SpaceGass  Nodes and Member input  Preliminary deck thickness and Super T depth  Load input – Dead Loads / Live Loads  Load Input – Moving loads  Load combinations from AS5100 2 3 4 4 4 4 4 SpaceGass – Output  Maximum Bending Moments for the slab deck  Maximum Shear Forces for the slab deck  Maximum Bending Moment for the critical Super T Beam  Maximum Shear Force for the critical Super T beam 4 4 4 4 Slab Deck Design  Hand Calculations for  Bending Moment Design (Positive and Negative)  Shear Force Design 6 4 Super T Beam Deck Design  Hand Calculations for  Bending Moment Design  Shear Force Design  Short Term Deflection under the worst case loading 12 10 8 Drawings  Bridge Plan View showing the Super T layout and other important dimensions ie lane widths, span etc  Typical Super T beam / slab cross section showing : o Strand Layout inc dimensions o All Reinforcement including slab reinforcement, Super T reinforcement and any ligatures 7 9 Spark Assessment 3 Total 100 x 20% = 20 6