Concrete Creep Analysis Method Based on a Long‐Term Test of Prestressed Concrete Beam

Abstract

Concrete creep plays a significant role in the long-term performance of the prestressed concrete structure. However, most of the existing prediction models cannot accurately reflect the in-site concrete creep in a bridge construction environment. To improve the prediction accuracy of creep effects in concrete structures, an innovative creep analysis method is developed in this study. Parameters in the creep model in fib MC 2010 have been calibrated with respect to the long-term loading test results of the prestressed concrete beam. The measured strains of concrete and the midspan deflections of the test beam are compared with the predicted results using the creep model in fib MC 2010. It indicates that the results predicted by the calibrated creep model are in good agreement with the test results. However, the results predicted by the creep model in fib MC 2010 significantly deviate from the test results. This proposed creep analysis method can provide a new thought to improve the predicted effect of the creep effects on creep-sensitive structures.

Long-term deformation assessment of a long-span concrete bridge built by the cantilever erection method

“…Therefore, Cao et al (2018) conducted experiments with prestressed concrete box beams under sustained uniform load for 470 days showing that concrete cracks reduce the stiffness of the box beams and therefore decrease the creep effect by releasing concrete stress. Yang et al (2020) conducted experimental work similar to Cao et al (2018) but using prestressed concrete T-section beams with the four-point bending strategy loaded for 1,400 days. Yang et al (2020) experimentally proved that the MC 2010 model underestimated midspan deflections and proposed an improved method to predict the creep of prestressed concrete structures.…”

“…Yang et al (2020) conducted experimental work similar to Cao et al (2018) but using prestressed concrete T-section beams with the four-point bending strategy loaded for 1,400 days. Yang et al (2020) experimentally proved that the MC 2010 model underestimated midspan deflections and proposed an improved method to predict the creep of prestressed concrete structures. The above facts show that existing creep model prediction models still need further development.…”

Flexural creep in plain concrete: State of the Art

“…This paper provides a concise review of the concrete creep studies in compression, tension and flexure of plain concrete reported in literature. Studies on plain concrete subject to bending in literature are limited as most of the recent research is focussed on bending creep in reinforced concrete [1][2][3] and prestressed concrete [4][5][6].…”