EXPERIMENTAL STUDY AND ANALYSIS ON ASEISMIC PERFORMANCE OF HIGH STRENGTH REINFORCEMENT CONCRETE BRIDGE PIERS

Aseismic performance of high-strength steel-bar-concrete-bridge piers designed is verified by quasi-static test. The damage characteristic of bridge piers was analyzed. The hysteretic characteristic, bearing capacity, ductility performance and energy dissipation were investigated. The effect of different improvement measures on aseismic behavior in terms of axial compression ratio, shear span ratio, stirrup space and reinforcement strength grade were analyzed. The results show that the damage behavior of concrete bridge piers with high strength reinforcement are similar to those with conventional stirrup. With a finite deformation, the small shear-span-ratio bridge-piers suffered flexural-shear failure models while the large shear-span-ratio one suffered flexural failure models and possessed large deformations. The bearing capacity of bridge piers is enhanced while the other aseismic index performance become low with the increased of axial compression ratio, which is disadvantage of aseismic performance of bridge piers. The more the reinforcement strength grade and stirrup ratio are, the better the aseismic performance is. Therefore, it is better for aseismic performance of bridge piers.