Time-dependent Behaviour Analysis of Long-span Concrete Arch Bridge

Abstract

This paper continues the previous study on clarifying the timedependent behaviour of Beipanjiang Bridge -a reinforced concrete arch bridge with concrete-filled steel tubular stiffened skeleton. The obtained prediction models and the Finite Element Models were used to simulate the long-term behaviour and stress redistribution of the concrete arch bridge. Threedimensional beam elements simulated the stiffened skeleton and surrounding concrete. Then, a parameters study was carried out to analyse the timedependent behaviour of the arch bridge influenced by different concrete creep and shrinkage models. The simulation results demonstrate that concrete creep and shrinkage have a significant influence on the time-dependent behaviour of the concrete arch bridge. After the bridge completion, the Comite Euro-International du Beton mean deviation of displacements obtained by 1990 CEB-FIP Model Code: Design Code model and fib Model Code for Concrete Structures 2010 model are 3.4%, 31.9% larger than the results predicted by the modified fib Model Code for Concrete Structures 2010 model. The stresses between the steel and the concrete redistribute with time because of the concrete long-term THE BALTIC JOURNAL OF ROAD AND BRIDGE ENGINEERING 2 0 1 9/ 1 4 ( 2 ) effect. The steel will yield if the fib Model Code for Concrete Structures 2010 model is used in the analysis. The stresses in a different part of the surrounding concrete are non-uniformly distributed.

Evolution Law of Concrete Interface Stress of Rigid-Frame Arch under Construction and Its Impact on Ultimate Load-Bearing Capacity

“…The rigid-frame arch bridge is an advanced structural design featuring a strong steel truss as its backbone, whose concrete is poured into internal tubes and then covered with externally cast concrete in ring-segmented patterns [ 1 ]. Such a structure recently attracted increasing attention owing to its increased load-bearing capacity, attractive appearance, and lower long-term maintenance costs [ 2 , 3 ]. According to data collected, for rigid-frame arch bridges with a main span exceeding 300 m, casting the main arch ring’s external concrete is typically performed in relation to segmented rings, also known as the multi-working planes balanced casting method [ 4 ].…”