Mixed Foundation Design Methodology for the Dr. P. Phillips Performing Arts Center, Phase 1

摘要

The use of mixed foundation types has high risk associated with compatibility of foundation performance under load. Unless the mixed systems work together as equivalent springs moving a similar amount, detrimental differential movement could produce structure cracking and possibly serious leakage for basement structures under the water table. The use of mixed foundations in plastic soils would be an even higher risk, and require significantly more assessment effort, as the the time rate of movement would need to be taken into account for clay soils and should be avoided due to excessive risk. This process is more complex than was observed in these sands, which behave elastically, like "springs". Careful consideration of all loads anticipated over the life cycle of the structure is warranted whenever a mixed foundation approach is considered in sand soils. In this particular case where funding was always in need, the owners searched for every way possible to reduce cost of construction. The design would not have been considered by this firm due to the risk element involved unless field performance testing was allowed and performed ahead of the final foundation design, as was the case.