SR99 Bored Tunnel-Assessment of Settlement Impacts ... - SCATnow
SR99 Bored Tunnel-Assessment of Settlement Impacts ... - SCATnow
SR99 Bored Tunnel-Assessment of Settlement Impacts ... - SCATnow
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3.0 E/G RatioE/G is based upon Table D-2 for all buildings. Note that E/G is used in thecalculation <strong>of</strong> angular distortion. E/G is not used in the calculation <strong>of</strong>horizontal ground strain ε h .Table D-2. Building E/GBuilding LateralStiffnessE/GNotesStiff 2.6S<strong>of</strong>t 12.0Shear wall or similar lateralsystem.Frame lateral system orcentral core with gravityframe perimeter.As shown in Figure D-7 the sensitivity <strong>of</strong> the predicted angular distortion valuevaries with E/G. A lower value <strong>of</strong> E/G produces a larger predicted angulardistortion value. Separate E/G ratios are utilized when checking predicteddamage <strong>of</strong> the basement or secondary portions <strong>of</strong> the structure as discussed inthe following “Building Height” section.The Alaskan Way Viaduct & Seawall Replacement Program March 2010Proposed SR 99 <strong>Bored</strong> <strong>Tunnel</strong> - <strong>Assessment</strong> <strong>of</strong> <strong>Settlement</strong> <strong>Impacts</strong> to Buildings D-11Public Disclosure Request 11-0123 for Elizabeth Campbell - 2nd installment
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