APPLICATION OF DISPLACEMENT ASSURANCE CRITERION USING DISPLACEMENT DATA FOR ASR-DETERIORATED GIRDER

This study focused on displacement data and proposed a displacement reliability evaluation index, DAC (Displacement Assurance Criterion), for assessing the overall rigidity of a structure. The DAC evaluation was applied to the results of the bending load tests of two prestressed concrete (PC) girders. One of the PC girders was affected by the alkali-silica reaction (ASR). In contrast, the other girder was kept at an inactive state by suppressing the ASR’s acceleration using fly ash concrete. The results show that the DAC index can express the difference between two displacement shapes with a single numerical value. Moreover, there is a correlation between the DAC index and the change in rigidity during the fracture process of each PC girder. Using the DAC value obtained by the loading test as a control value for displacement monitoring due to temperature change, DAC may be a method that can easily find abnormal values.