Pacific Earthquake Engineering Research Center Behavior of Reinforced Concrete Bridge Columns Having Varying Aspect Ratios and Varying Lengths of Confinement Anthony J. Calderone KGA Engineers, Inc. Laguna Beach, California Dawn E. Lehman University of Washington, Seattle and Jack P. Moehle University of California, Berkeley A report on a research project funded by the Federal Highway Administration and the California Department of Transportation under grant no. RTA59X517 PEER 2000/08 JAN. 2001