This six-story, 487,000-square-foot, parking structure can house 1,602 vehicles on grade. The Type 1B structure consists of relatively small foundations that bear directly on a granite sub base. There are four passenger elevators, three exterior precast stairways, and a 250-foot pedestrian bridge.
The PCL team came across differential settlement concerns and decided that the best approach would be to import fill and raise the grade by three feet. To address these concerns, PCL designed the moment frame on the north side to be rigid enough to significantly minimize any independent movement. At foundation locations where existing granitic rock was within 10 feet below the raised grade after import, the PCL team excavated down to the rock and filled the trench with slurry to the bottom of the foundation. This allowed the northern portion to be designed to 10,000 pounds per square foot, and significantly reduced the grade beam and spread footing sizes. This decision eliminated the need to blast any rock, which reduced the construction schedule by three months and saved the client a significant amount off the budget.
2011 Merit Award - American Society of Civil Engineers (ASCE)
2010 Project of the Year, Midsize Project - American Public Works Association, San Diego and Imperial Counties Chapter
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