Modelling of solid and hollow voussoir FlexiArch systems

Abstract

This paper investigates the use of solid and hollow core voussoir blocks in an innovative FlexiArch bridge system. The system is formed from precast concrete voussoirs connected by a polymeric reinforcement, enabling the arch to be built and transported as a flat pack and lifted into shape after delivery to site, thus avoiding the use of centring for construction. This research is novel in that it trials and compares the use of hollow core and solid FlexiArch rings in third-scale models with granular backfill. The use of hollow core voussoirs reduces the loading on the polymeric reinforcement during construction and should allow for increased spans. This paper presents the test results of two similar third-scale 5 m 6 2 m (span 6 rise) arch systems, using both solid and hollow construction. The use of hollow core voussoir blocks reduces the weight of the system. Non-linear finite-element analysis (NLFEA) has been used to further compare arch behaviour and the thrustline position. Notation c intrados joint opening at equivalent EU SV196 axle load d deflection at equivalent EU SV196 axle load f ckcube concrete cube compressive stress f r polymeric reinforcement rupture stress L arch clear span P CFEA peak load predicted by continuous NLFEA model P DFEA peak load predicted by discrete NLFEA model P t peak load in laboratory model R arch rise Q friction angle (phi)

Editorial

“…The river is an important transport route and the need to minimise navigation restrictions was a governing consideration for the erection sequence of the steel box-girder spans. The authors discuss alignment control during closure of the spans and for locking of the moving bridge.The final paper in this issue by Bourke et al (2014) presents ongoing research to further develop the FlexiArch system (Long et al 2013). The system is formed of precast concrete voussoirs connected by polymeric reinforcement and combines the long-term durability advantages of unreinforced masonry…”

“…The final paper in this issue by Bourke et al (2014) presents ongoing research to further develop the FlexiArch system (Long et al 2013). The system is formed of precast concrete voussoirs connected by polymeric reinforcement and combines the long-term durability advantages of unreinforced masonry /dx.doi.org/10.1680/bren.2014.167.1.1 ice | proceedings ICE Publishing: All rights reserved with the constructability advantages of precast concrete.…”