Assessment of the load-carrying capacity of the concrete pier subjected to the freeze-thaw cycles

Aiming at the situation that the concrete piers in the northern area and most of the southern area of our country are affected by the damage of the freeze-thaw cycle in varying degrees, this paper has studied the assessment of load-carrying capacity of concrete piers under freeze-thaw condition. In this paper, based on the mechanism of freeze-thaw process, several factors affecting the freeze resistance of concrete were considered, and a regression model considering the interaction of freeze-thaw and loads was established according to experimental data. When the load-carrying capacity of pier after freeze-thaw cycles is analyzed, a whole new concept the effective depth of the freeze-thaw has been introduced into the analyzing, and it also considers of the area of cross section reducing, which results in the stress concentration. It calculates the maximal stress by using the limit state design method, finally judges its rank of damage.