Design of 38m Span Post-tensioned Ultra High Performance Fiber-Reinforced Concrete (UHPFRC) Composite Bridge

摘要

Although ultra-high-performance fibre reinforced concrete (UHPFRC) has become commercially available in many countries, there are still limited design standards for UHPFRC structures. In 2016, the French Standard Institute has published the world first design standard for UHPFRC structures (NF P18-710) which is read conjunction with the UHPFRC material specification code (NF P18-470). This standard is the national complement to Eurocode 2 for the design of UHPFRC structures. To date, there have several UHPFRC bridges been designed by using this French Standard. The aim of this paper is to demonstrate working example on the design calculation of 38m span post-tensioned UHPFRC composite bridge using DURA~R Grade 140 which was recently constructed in Kuala Terengganu. The working example mainly focus on (i) the material properties input in the structural analysis software - Midas Civil; (ii) the output results on the design forces at the critical sections (mainly the design moment effect, M_(Ed), and design shear force effect, V_(Ed)); (iii) the stresses of the post-tensioned UHPFRC U-girder at transfer, at different construction load history and at service stage (iv) the design moment resistance (M_(Rd)) and design shear resistance (V_(Rd)) of the composite section.