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This report provides a comprehensive evaluation of bridge approach damages observed after the Northridge earthquake. It categorizes damage severity from minor to severe, including conditions such as cracking of concrete barriers, settlement issues at abutments, and deck collapse instances. Figures illustrate specific damage types, including flexural cracking of girders and bearing failures. Key observations indicate the impact of soil settlement and thermal loads, emphasizing the need for meticulous assessment of structural integrity in the aftermath of significant seismic events.
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Figure 14: Moderate Damage - Approach Slab Settlement at the Abutment. Note the cracking of the concrete barrier as well.
Figure 15: Moderate to Major Damage - Approach Settlement After Northridge
Figure 16: Moderate to Major Damage – Settlement of Bridge Approach
Figure 56: Settlement at the bridge approach, likely caused by soil settlement around the abutment (Northridge EQ)
Figure 60: Moderate Damage: Transverse Movement of the Abutment Wingwall
Minor cracking of curb 100_8779
Serious erosion behind wingwall 100_8783
Figure 58: Misalignment of curb line and bowing of railing. Notice that the white edge line is slightly shifted at the joint.
Figure 18 and 19: Severe Damage: Deck Collapse (I-10 and SR 118 Damage from Northridge EQ http://itsdocs.fhwa.dot.gov/jpodocs/repts_te/13775.html)
Figure 24: Moderate Damage – Flexural Cracking of Concrete Girder (KTC)
Figure 28: Moderate Damage: Crack in web of steel girder. Flag condition.
Figure 27: Minor Damage - Web stiffener damage. Note paint chipping.
Joint – Minor Cracking, Separation 100_8746
Figure 16: Moderate Damage - Vertical and horizontal movement at joint indicates possible bearing or girder displacement and damage
Figure 16: Moderate Damage - Vertical and horizontal movement at joint indicates possible bearing or girder displacement and damage 100_8561
Figure 21: Minor Damage: Transverse Movement Along the Centerline (Check for bearing damage.)
Figure 22: Moderate Damage: Differential Settlement and Expansion Joint Damage
Figure 49: No Damage: Tilted Rocker Bearings. Movement due to Thermal Loads (INDOT)
Figure 54: Severe Damage. Missing Abutment Bearing After Northridge After Northridge
Figure 31: Moderate Damage - Fracture of lower lateral bracing.
Figure 33: Ground movement indicating possible foundation problem
Tilted pier wall 100_8761
