Time-Dependent Structural Analysis Considering Mass Transfer to Evaluate Deterioration Process of RC Structures

Abstract

A time-dependent structural analysis method under multi actions in consideration of drying shrinkage due to moisture transfer and rebar corrosion due to chloride ions penetration as well as external load actions was developed. The Rigid-Body-Spring Networks (RBSN) model and the truss networks model were used for structural analysis and mass transfer analysis, respectively. In addition, mass transfer through bulk concrete and mass transfer through cracks by setting truss networks on the boundaries of Voronoi particles, was also considered. The developed method was confirmed to simulate well the deterioration process due to mass transfer for initial cracking behavior and ultimate behavior of concrete structures.

Analysis of Crack Propagation due to Thermal Stress in Concrete Considering Solidified Constitutive Model

“…To simulate cracking behaviors of early age concrete, the fundamental constitutive model was based on a solidification concept that is different from the one presented by Bazant et al (1989) in that the solidified constitutive model can consider the nonlinear stress-strain relation easily and stress increments in each solidified element can be calculated. Moreover, to evaluate cracks in early concrete structures, the unified numerical model (Nakamura et al 2006) consisting of the Rigid-Body-Spring Networks (RBSN) model and the truss network model was used with Voronoi random mesh.…”

“…For the structural analysis model, the unified numerical model (Nakamura et al 2006) consisting of the Rigid-Body-Spring Networks (RBSN) model (Kawai 1978) as the basis for a structural model and a truss network model as a basis for a mass transfer model (Bolander and Berton 2004) was used because it can clearly display the initial cracks and crack propagations without having to define the position of cracks before analysis. Moreover, random geometry was introduced using Voronoi diagrams in order to reduce mesh bias on crack propagation (Bolander and Saito 1998).…”

Feedback System of Ion Transfer through Cracks During Deterioration of Mortar Due to Sulfate Attack Evaluated by RBSM-Truss Network Model

“…Diffusion-reaction model for sulfate attack and RBSM can be coupled by Truss Network Model as proposed by Nakamura et al (2006). In this model, one-dimensional pipe elements, which cannot be influenced mechanically, are set between the center of element and the center of boundary surface (E p1 ), and between the center of boundary surface and the center of line constructing boundary surface (E p2 ).…”

“…The authors have developed a three-dimensional crack propagation analysis named Rigid-Body-Spring-Model (RBSM). Moreover, mass transfer through the cracks such as moisture transport and chloride ion penetration can be evaluated by means of coupling RBSM with Truss Network Model (Nakamura et al 2006). Using RBSM-Truss Network Model, we have conducted several attempts to reconstruct transformation of solid phase, macroscopic expansion rate and expansion cracking behavior (Miura et al 2016).…”

Evaluation Method of Tensile Behavior of Corroded Reinforcing Bars Considering Radius Loss

“…Hence a truss network (Nakamura et al 2006) is combined with RBSM to cope with the analysis implemented here. The rigid particle elements are linked by truss elements with a node at each nucleus and at intermediate points on each particle boundary, as shown in Fig.…”