Long-Term Differential and Averaged Deformation of Box-Type Pre-stressed Concrete Exposed to Natural Environment

Abstract

Middle-scale box-sectional hollow PC ducts, which consist of heterogeneous concrete with different mix proportions, were exposed to natural environments for about three years, and the long-term curvature and axial mean deformation, which have much to do with deflection of long span bridge viaducts, was gaged for verification of coupled thermo-hygral and multi-scale models. The associated internal moisture and the local climate inside micro-pores were measured and the effect of precipitation was quantified over yearly four seasons. The moisture migration linked with concrete multi-scale mechanics was analyzed and the simulation results are compared with the field exposure tests. The reliability of the thermo-hygral analysis, which has been used for estimating the long-term serviceability of bridges, was made firmer.

A simplified approach to evaluate cyclic response and seismic fragility of corrosion damaged RC bridge piers

“…Finite element software package COM 3 was used to perform reversed cyclic loading of the corroded specimens using the proposed simplified model. The reliability of this software tool can be found elsewhere Maekawa, 2015a, 2015b;Uno et al, 2017;Kurihara et al, 2017;Chijiwa et al, 2018;Yamada et al, 2017). Modelling of the foundation part of the RC bridge pier was omitted (see Fig.…”

Modeling Long-term Delayed Strains of Prestressed Concrete with Real Temperature and Relative Humidity History

“…More realistic simulation of temperature and relative humidity, including rainfall based on meteorological data acquisition were considered in other studies (Shimomura 2015;Watanabe and Ohno 2015). As for structural level, Ozaki et al (1995) and Chijiwa et al (2018) simulated long-term behavior of prestressed concrete containers vessels while considering variable temperature and relative humidity. In the above mentioned literature, the concept of equivalent time was used considering thermal activation of water viscosity.…”