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| Residential Seismic Strengthening
Earthquakes are a natural occurrence caused by the constant motion of the Earth's crust. This motion creates the buildup of pressure along faults which is released in the form of an earthquake. Earthquakes are sudden and without warning. Strong ground shaking can cause severe damage to buildings, cracking walls, toppling chimneys or even shifting buildings off their foundation. Older buildings and homes are especially at risk because they often lack adequate anchorage to their foundation and were not designed to resist the shaking and movement expected from earthquakes today. Identifying potential hazards ahead of time, strengthening homes, buildings and utilities can reduce damage and the dangers of serious injury or loss of life from an earthquake. Modified from www.oregongeology.org/sub/earthquakes/EQs.htm.
The City of Portland, Bureau of Development Services has a program to help you make your home more secure in our next earthquake. See brochure #12 - Residential Seismic Strengthening - Methods to Reduce Potential Earthquake Damage for more details.
General Structure Notes, Sample Plan & Details Residential Seismic Strengthening GENERAL STRUCTURE NOTES (PDF Document, 26kb)
Summary of Minimum Prescriptive Requirements (PDF Document, 371kb) Sample Plan and Note (PDF Document, 137kb) 2a. Cripple Wall Section - Parallel Joists (PDF Document, 111kb) 2b. Cripple Wall Section - Parrallel Joists (PDF Document, 132kb) 3. Cripple Wall Section - Perpendicular Joists (PDF Document, 124kb) 4. Cripple Wall Bracing - Opening Reinforcement (PDF Document, 26kb) 5. Blocking / Framing Anchor (PDF Document, 28kb) 6. Sill Plate Bolting - No Cripple Wall Parallel or Perpendicular Joist (PDF Document, 27kb) 7. Sill Plate Bolting - Trapezoidal Footing (PDF Document, 22kb) 8. Sill Plate Bolting - No Floor Joists Paralled or Perpendicular Joist (PDF Document, 24kb) 9. Cripple Wall Bracing - Interior Elevation (PDF Document, 33kb) 10a. Joist Perpendicular to Cripple Wall - Anchorage for Joists Supported on Concrete (PDF Document, 29kb) 10b. Joist Parallel to Cripple Wall - Anchorage for Joists Supported on Concrete (PDF Document, 21kb) 11. Cripple Wall Bracing with Plywood on Exterior Face of Cripple Studs (PDF Document, 29kb) 12. Single Top Plate Splice (PDF Document, 21kb)
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