Abstract
The sectional area of urban-type elevated RC bridge piers is generally made small because of restricted conditions around the piers. For this reason, main reinforcements are usually multi-layers. In order to evaluate their influence quantatively, reversed cyclic loading tests were conducted on a large-size model (1/3 scale) that adopted the reinforcement arrangement of actual piers and a small-size model (1/10 scale). Accroding to the experimental results, a large size model showed no serious decline in ductility, of which ductility factor was nearly equal to that of a small model. However, reinforcement pull-out of a large size model was three times larger than that of a small model due to multi-layered reinforcement arrangements, which implies that reinforcement pull-out may give a considerable effect on the behavior of actual bridges. Next, on the basis of the relationship between the moment-rotation angle derived from reinforcement pull-out analysis of reversed cyclic loading tests, RC non-linear analysis was conducted, taking the reinforcement pull-out as a rotational spring. From the test results, it was found that actual load-displacement behavior is well simulated.
