procedures following observed damage (structural and non
TRANSCRIPT
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Procedures Following Observed Damage (Structural and Non‐Structural)
Arne P. Johnson, PE (IL, IA, WI, OH, MO, IN, MN)Iowa DOT Workshop, October 29, 2015
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SOLUTIONS FOR THE BUILT WORLD
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1. Clarify contractor responsibility for damage2. Contractor should change methods to lower energy methods!3. Inspection by experienced structural engineer4. Confirm and categorize the damage
Threshold damage Minor damage Major damage
5. For non‐structural damage (threshold, some minor), contractor required to repair to pre‐event condition
6. For structural damage (some minor, major), structural engineer to develop repair procedures and repair specifications/drawings
Procedures Following Observed Damage
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Threshold Damage:Opening of old cracks and formation of new plaster cracks, dislodging of loose objects (e.g., loose bricks in chimneys)
Minor Damage:Superficial, not affecting the strength of the structures (e.g., broken windows, loosened or fallen plaster), hairline cracks in masonry
Major Damage:Resulting in serious weakening of the structure (e.g., large cracks or shifting of foundations or bearing walls, major settlement resulting in distortion or weakening of the superstructure – walls out of plumb)
Categorizing Damage*
* Dowding, Charles, Construction Vibrations, 2000, p. 110‐111.
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Determine if temporary shoring or stabilization measures are needed for public safety or to prevent additional damage
Investigate extent and structural significance of damage Is damage “direct” only, or might damage manifest in future? Develop permanent repair – typically drawings and specs:
Effective (to restore structure to pre‐event condition) Practical, constructable Impact on construction schedule Contractor submittals and approvals in advance of work Coordinate with property owner (their agreement)
If Structural Damage
Structural Engineering Tasks:
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Examples – The Pierre, Chicago, IL
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Examples ‐ Iowa
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The Robie House (Frank Lloyd Wright)
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Vibration Limits:Building: 0.20 in/sec*Building roof: 0.50 in/sec** frequency dependent
The Robie House (Frank Lloyd Wright)
Heavy truck traffic (40 ft) Excavation and sheeting (70 ft) Demolition on building wall (110 ft)
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Preconstruction Survey, 9/27/2012
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Preconstruction Survey, 9/27/2012
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CM1
CM2
CM8
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Interim Survey, 4/19/2013 / Post‐construction Survey, 7/8/2014
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Interim Survey, 4/19/2013 / Post‐construction Survey, 7/8/2014
CM1: 0.040 to 0.090”
CM2: 0.030 to 0.050”
CM8: 0.050 to 0.075”
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1. Clarify contractor responsibility for damage2. Contractor should change methods!3. Inspection by structural engineer (retained by Engineer or
contractor)4. Confirm and categorize the damage
Threshold damage Minor damage Major damage
5. For non‐structural damage (threshold, some minor), contractor required to repair to pre‐event condition
6. For structural damage (some minor, major), structural engineer to develop repair procedures and repair specifications/drawings
Procedures Following Observed Damage
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Questions / Discussion