SR99 Bored Tunnel-Assessment of Settlement Impacts ... - SCATnow

2.0 B&C Damage ClassificationsTable D-1. Classification of Visible DamageClass ofDamageDescription of Damage aUpperBoundPrincipalStrainApproximateWidth b ofCracks, mmNegligible Hairline cracks. 0.00050 < 0.1VerySlightFine cracks easily treated during normal redecoration.Perhaps isolated slight fracture in building. Cracks inexterior brickwork visible upon close inspection.0.00075 < 1SlightCracks easily filled. Redecoration probably required.Several slight fractures inside building. Exterior cracksvisible, some re-pointing may be required for weathertightness.Doors and windows may stick slightly.0.00150 < 5ModerateCracks may require cutting out and re-patching. Recurrentcracks can be masked by suitable linings. Tuck-pointingand possibly replacement of a small amount of exteriorbrickwork may be required. Doors and windows sticking.Utility service may be interrupted. Weather-tightnessoften impaired.(Moderateand Severecategoriesoftencombined.)5 to 15 orseveralcracks > 3mmSevereExtensive repair involving removal and replacement ofsections of walls, especially over doors and windows,required. Windows and door frames distorted, floorslopes noticeably. Walls lean, doors bulge noticeably,some loss of bearing in beams. Utility service disrupted.0.00300 15 to 25, alsodepends onnumber ofcracks.VerySevereMajor repair required involving partial or complete reconstruction.Beams lose bearing; walls lean badly andrequire shoring. Windows broken by distortion. Dangerof instability.>0.00300 Usually > 25mm,depends onnumber ofcracks.a Location of damage in the building or structure must be considered when classifying the degree ofdamage.b Crack width is only one aspect of damage and should not be used alone as a direct measure of it.Note: Modified from Burland et al. [1977]The Alaskan Way Viaduct & Seawall Replacement Program March 2010Proposed SR 99 Bored Tunnel - Assessment of Settlement Impacts to Buildings D-9Public Disclosure Request 11-0123 for Elizabeth Campbell - 2nd installment