Creep Characteristics Of Concrete Used In Long-Span Arch Bridge

Abstract

The reinforced concrete arch bridge with concrete-filled steel tubular stiffened skeleton is extensively used in the mountainous area of southwest China due to their long span and high stability. Beibanjiang Bridge located in Shanghai- Kunming high-speed railway, which had a record span of 445 m, has recently been completed in 2016. However, concrete creep and shrinkage have pronounced effects on the long-term deflection and stress redistribution of this bridge. Several concrete creep and shrinkage specimens in the natural environment were made to predict the long-term behaviour of this bridge accurately. They were used to measure the concrete creep and shrinkage of the core concrete and surrounding concrete used in the arch bridge. The test results were compared to ACI209 R-92 Prediction of Creep, Shrinkage and Temperature Effects in Concrete Structures model, 1990 CEB-FIP Model Code 1990: Design Code model, fib Model Code for Concrete Structures 2010 model and Creep and Shrinkage Prediction Model for Analysis and Design of Concrete Structures-Model B3. Based on the numerical fitting method, the fib Model Code for Concrete Structures 2010 model was modified to suit the concrete creep and shrinkage experimental results. Then, the modified fib Model Code for Concrete Structures 2010 model was used to predict the timedependent behaviour of a concrete arch bridge.

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

“…The results predicted by the models, either overestimate or underestimate the experimental data in some cases (Al-Manaseer & Prado, 2015;Goel, Kumar, & Paul, 2007). Although the comparisons between the predicted results obtained by different shrinkage and creep prediction models and experimental results are explored by Wang, Zhao, Jia, & Liao, (2019). The deflection differences in arch crown calculated by difference shrinkage and creep models are clear if the finite element analysis of concrete arch bridge will be carried out (Yang, Cai, & Chen, 2015).…”

“…The material parameters used in the Finite Element Model are listed in Table 1. The concrete strength and elastic modulus were tested by the concrete prism with the size of 100×100×300 mm at 28 days, as shown in Table 2 from Wang, Zhao, Jia, & Liao (2019). Moreover, the elastic modulus development curves with time are the fitted equation shown in Table 2 of Wang, Zhao, Jia, & Liao (2019).…”

“…The concrete strength and elastic modulus were tested by the concrete prism with the size of 100×100×300 mm at 28 days, as shown in Table 2 from Wang, Zhao, Jia, & Liao (2019). Moreover, the elastic modulus development curves with time are the fitted equation shown in Table 2 of Wang, Zhao, Jia, & Liao (2019). As the authors know that the core concrete was sealed in steel tube without humidity exchanging with the natural environment, so the relative humidity was assumed as 90% for simplicity (Yang, Cai, & Chen, 2015).…”

“…The deflection differences in arch crown calculated by difference shrinkage and creep models are clear if the finite element analysis of concrete arch bridge will be carried out (Yang, Cai, & Chen, 2015). Therefore, this study used the CEB mean deviation method (Al-Manaseer & Prado, 2015) to evaluate the validity of the Modified CEB10 (Wang, Zhao, Jia, & Liao, 2019), ACI209 (ACI209 R-92,1992), CEB90 (CEB, 1993) and CEB10(CEB, 2012) models in predicting the time-dependent behaviour of the concrete arch bridge. The CEB mean deviation M CEB (as shown in Eq.)…”

“…Moreover, the surrounding concrete section is divided into six parts to simulate the construction process. The concrete creep and shrinkage models developed by the experimental study in the previous analysis (Wang, Zhao, Jia, & Liao, 2019) are used in this bridge. The time-dependent behaviour of Beipanjiang Bridge was simulated throughout the construction phase and 100 years after construction by the FEM.…”