Effect of seismic loading patterns on reinforced concrete bridge piers.

摘要

This research aims to determine the effect of loading pattern on the damage of areinforced concrete bridge column.In the literature review, some common quasi-static loading patterns used in NewZealand, United States and Japan are summarised, and the standard cyclic loading patternwhich has been used extensively at the University of Canterbury is introduced. The fatiguebased damage model used in this research to estimate the damage of the test specimensis reviewed, and the de§.ign procedure of a reinforced concrete bridge column using thelatest Japanese specification is summarised.Five specimens were made and tested with four different cyclic loading patterns; fourspecimens were identical and one specimen was constructed with low strength concrete.The specimens were scale models of a reinforced concrete bridge column designed usingthe Japanese specification. Three specimens were cyclically loaded in one direction, andthe other two were bi-directionally loaded, all combined with a uniform axial load.From the test result, the plastic hinge zone length was calculated and compared tosome theoretical values. Moment-curvature analyses were carried out and the energydissipated by the specimens was obtained from the test results. The transition of damageindex was also calculated from the loading history of the tests using a fatigue-baseddamage model.From the result of the analysis, a procedure to predict the failure of a reinforcedconcrete column subjected to uni-directionalloading or bi-directionalloading, is proposed.