Unreinforced Masonry Seismic Retrofit Project
Portland City Council seeks to reduce the risk posed by Unreinforced Masonry (URM) buildings. Three advisory committees have been formed over the last 2 years to provide input and guidance in the development of staff recommendations that will be presented to City Council.
Project description, committee documents and updates can be found here: https://www.portlandoregon.gov/pbem/66306
The URM database lists Portland buildings that include at least 1 URM load bearing wall. Some PPS schools are primarily lightly reinforced concrete or wood framed but may include URM walls as a secondary construction type. Note that some PPS schools include interior non-load bearing hollow clay tile walls, which would not be included on the database.
The summer bond work includes incremental (or phased) seismic improvements. It is typically not possible to completely retrofit an entire PPS school to current code in a summer break. Until the school is completely upgraded and retrofit to meet ASCE 41-13, it will remain on the URM database, which is maintained by the City's structural engineers at the Bureau of Development Services. PPS has been working with City's engineers on confirming the accuracy of the URM database. http://www.portlandoregon.gov/bds/70766
Oregon Schools Seismic Status Report
SB 1566 (2012) amended ORS 329.105 to require all school districts and education service districts to notice the Oregon Department of Geology and Mineral Industries of any construction of new school buildings or modification of an existing school building in a manner that may affect the seismic risk catergory of a school. View status reports here.
Expected Performance Ratings
2012 Expected Seismic Performance (EPR) Ratings were compiled by James G. Pierson, Inc. Consulting Structural Engineers in spring 2012 and are modeled on the University of California at Berkeley classification system. These classified Portland Public School facilities, by campus, into general groupings to describe their expected performance in an earthquake, using Good, Fair, and Poor. Click here for 2012 Expected Seismic Performance Ratings. The ratings were used in 2012 bond development and planning as a general seismic guide for expected performance and prioritization. All Poor EPR schools in operation during bond planning were scheduled to receive seismic improvements as part of the 2012 school construction bond.
The performance rating system takes into account seismic risk score, previous seismic improvement work, the building class, age of construction, vertical and horzontal irregularities, building site, numver of stories and any documented condition of the structural materials. it should be noted that school facilities are often a combination of additions and different building types that have been constructed over many years. Many schools have more than one building class/construction type.
Seismic Rehabilitation Grant Program (SRGP)
The Seismic Rehabilitation Grant Program (SRGP) is a state of Oregon competitive grant program that provides funding for the seismic rehabilitation of critical public buildings, particularly public schools and emergency services facilities. PPS has received (3) SRGP grant awards to date.
SRGP applications are evaluated and ranked on numerous factors, including: the Benefit Cost Analysis (BCA score), project readiness, seismic deficiencies, and scope of work. The maximum project award is $1.5 million and ASCE 41-13 evaluation method must be used to design to Life Safety performance level.
2009 PPS Seismic Study
In the summer of 2009, the District hired KPFF Consulting Engineers (KPFF) to conduct a seismic study of PPS school buildings. KPFF examined twelve school campuses as a representative sample of building construction types. Results were extrapolated across all schools. The conceptual designs were developed using ASCE 31-03 for evaluation and ASCE 41-06 for strengthening.
KPFF evaluated these representative buildings to:
- Identify seismic deficiencies.
- Develop preliminary rehabilitation options.
- Develop construction cost estimates for these options on a per-square-foot basis.
2009 Re-Roofing Projects
In 2009, PPS incorporated roof level seismic strengthening at eight schools as part of solar re-roofing projects.
2006 DOGAMI Statewide Needs Assessment
The 2006 Department of Geology and Mineral Industries (DOGAMI) Statewide Seismic Needs Assessment was an important step to raise awareness of the statewide needs for seismically improving buildings and securing funding for the Seismic Rehabilitation Grant Program (SRGP).
The assessment by DOGAMI was a "rapid visual screenings (RVS)," not a comprehensive structural assessment. The evaluation may not have captured all local steps taken in recent years to upgrade older facilities based upon seismic needs. To determine the true seismic safety of any given building, a much more detailed, site specific geotechnical and/or engineering survey is needed.
For more information, visit the DOGAMI FAQ page and in particular Question #7 "How do you define 'collapse' in this report?" and Question #10 "Is my child safe in a high risk school?"
2002 Comprehensive Seismic Studies
In 2001, the District hired James G. Pierson Consulting Structural engineers to perform a comprehensive study of the lateral upgrade status of the Portland Public Schools facilities. The report narratives descrive the building, construction types, improvements completed to date and revised Hazard Index scores.
2001 Board Policy
The PPS School Board adopted the Lateral Force Upgrade Policy to Govern Seismic Renovations to Existing Buildings on May 21, 2001. This policy specified collapse prevention and preserving routes of egress as the highest priority of seismic improvements.
1995 Capital School Construction Bond
At the start of the 1995 Capital Improvement Program (Bond) all schools were evaluated for resistance to lateral (seismic) forces in accordance with recognized national standards, FEMA 178. Numerical scores were computed to evaluate school buildings and quantify the risk associated with deficiencies found. These hazard scores were used as a basis for the decisions prioritizing the lateral improvements undertaken.
The 1995 Facilities Capital Improvements (Bond) Program included $47 million for seismic improvements. Seismic improvements were completed at 53 schools, two other facilities and as part of re-roofing at 15 schools.