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Proposed Preston River Bridge in Bunbury, WA
- 1. Proposed Bridge over the Preston River in East Bunbury, Western Australia Kyawt Yamin Thwin -700020607 Khant Htut Lwin -700020600 Toe Myint Naing -700020605 Anthony Mak Chao Jun -700014760 Project Background A new bridge is required to replace an existing bridge which crosses over the Preston River in Bunbury, Western Australia. The prosed bridge types is cable-stayed bridge. Key objective and client’s intent • to optimize between the bridge aesthetics and the construction cost and time. • Minimis environmental impact Relevant Standards and Design Specification • AS 3600_2018: Austria Standard Concrete Structure • AS 5100.1_2017: Austria Standard: Bridge Design: Scope and General Principles • AS 5100.2_2017: Austria Standard: Bridge Design: Design Loads • AS 5100.5_2017: Austria Standard: Bridge Design: Concrete Construction method Preliminary Drawing Site preparation 1. Demolition 2. Removing asbestos 3. Site Clearing 4. Site surveying and set out 5. Earthwork Substructure 1. Initiate the caisson system 2. Pump out water 3. Drive piles into the ground according to design 4. Assemble footing according to design. 5. Erect piers to designated level. Superstructure 1. Erect pylons and girder simultaneously fixing it to the piers. 2. Initiate balanced free cantilevering system using derrick cranes 3. Install stay cables stressing it to relieve the bending moments in the girders 4. Install final stay cables Item Detail Justification Bride span 66 meters • Estimated from Google Maps. Bridge type Cable-stayed Bridge • Less steel cable, faster to build n incorporate more precast concrete section • Higher stiffness and display smaller deflections than suspension bridges Pylon 12 m • Optimal Height of pylon that can comply with 0.25 𝑙 • The higher the tower above the road level, the lower the cable forces and the required quantity of cable steel. 2 number • A single tower design cost more and the height of tower need to be higher than that of twin tower. Single tower height of pylon must comply with 1.8 𝑙 20 m from left edge • The side span of the cable stayed bridge shell be about 0.42 time that of the main span. • Pylon was in the between of the main span 46m and the side span 20m. Cable Semi-harp shape cable configuration • The structure’s aesthetics is really pleasing 3 numbers at each tower • to reduce the bending moments of the beam • decrease the individual cable forces to be anchored. 15m c/c on deck • By adjusting the angle of the stay (α) nearer to the pylon, the required stay cables size will decrease, and the height of pylon will increase 1 m c/c on tower • To develop semi-harp shape arrangement of cables • Easy to maintain Footing Pile footing • Drilled pile footing • Pile cap Preliminary design Cable Cable Force (P) No. of stands Cable 1 3153.55 kN 67 nos Cable 2 5256.02 kN 111 nos Cable 3 6713.74 kN 142 nos Construction cost Specifications Total cost Cost per Area Price Index 2020 Cost per Area (Proposed Bridge) Total Cost 2020 ANZAC Bridge (Pyrmontm, New South Wales, Australia) Width: 32m Length: 805m Longest Span: 345m Year of Complete: 1995 AUD 170 million AUD 6,599.38 260% AUD 17,142.16 AUD 18.1 million Eleanor Schonell Bridge (Dutton Park, Queensland, Australia) Width: 20m Length: 390m Longest Span: 183m Year of Complete: 2006 AUD 56 million AUD 7,179.49 142% AUD 10,195.10 AUD 10.8 million Reference: “Design and Analysis of Cable Stayed Bridge” 2017 -Murkute U.T. “Cable Stayed Bridges With Prestressed Concrete”- Fritz Leonhardt Project Timeline