Analytical and Experimental Investigations of the Effect of Vertical Ground Motion on RC Bridge Piers

Abstract eng:
A research program aimed at investigating the effect of vertical earthquake motion on the behavior of reinforced concrete piers is described. For the analytical investigation, a parametric study was conducted considering various ratios of peak vertical-to-horizontal ground accelerations (V/H) and results are compared to the case of horizontal excitation on its own. The time lag between the arrival of the peak horizontal and vertical accelerations was also studied. In the experimental investigation, hybrid simulation was employed using the Multi-Axial Full-Scale Sub-Structured Testing and Simulation (MUST-SIM) facility at the University of Illinois. In the hybrid simulations, a large scale pier was tested with an analytical module of a bridge structure. It is concluded that vertical ground motion can significantly impact RC pier behavior.

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