Design of Mat Foundation for Egg Shape Digesters

by S. S. Ibrahim, Black & Veatch, Los Angeles, United States,
M. R. Graves, Black & Veatch, Los Angeles, United States,

Document Type: Proceeding Paper

Part of: Structures Congress XII


Two levels of ground motion, the Maximum Probable Earthquake and the Maximum Credible Earthquake, were considered in designing the 2.5 million gallon egg shape digesters and their combined mat foundation. A 3-D finite-element model including the effects of soil-structure interaction was used with a site-specific response spectrum for each ground motion to determine seismic forces. The influence of different values for the dynamic shear modulus and depth of foundation embedment on the soil-structure interaction outcome were investigated. Reactions from digesters moving in different modes were examined in the mat foundation design. Shear reinforcement in the mat foundation was used to minimize mat thickness for economy and ease of construction.

Subject Headings: Foundation design | Mat foundations | Soil modulus | Shear modulus | Seismic design | Materials engineering | Ground motion

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