| 研究実績の概要 |
This research is mainly to develop a mesoscale analyzing system for the frost damage problems of concrete structures, together with the combining effects by external loads. Till now, the comprehensive physical and mechanical model, as well as the numerical method are still absent, which are the main purposes of this research project.
The original research plan has been accomplished well. Two journal papers for the physical model and numerical simulation of pure frost damage; one paper (under review) for the modeling and simulation of combined frost action and static loads; another one (under writing) for the combined frost effect with fatigue loading. Several conference papers are also published. The details of outcomes are as follows:
(1) The theoretical physical model has been developed to calculate the pore pressures generated inside the concrete material under variation of temperatures and moist conditions. (2) The mesoscale simulation model has been developed based on Rigid Body Spring Model (RSBM), and using the pore pressure model developed above, the material deformation can be simulated. (3) Based on the multi-phase composite theory, the expression of effective elastic modulus and strength of concrete with different amount of ice, liquid water and air is developed and simulated by RBSM. (4) The constitutive model for RBSM under fatigue loading is modified, and combining with frost damage caused by internal pressures. The S-N curve for FTC undamaged and damaged concrete are simulated.
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