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Earthquake Safety Guidelines for Educational Facilities

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Earthquake Safety Guidelines for Educational Facilities Earthquake Safety Guidelines for require an increased earthquake awareness Educational Facilities for parents, educators, school boards and students. Such an increase in awareness has By Rob Jackson, P. E. been a focus of the Earthquake Engineering Research Institute’s (EERI) Seismic Safety Every child has the right to attend school in of Schools Committee (EERI, 2012). safe buildings. The United States has been relatively lucky so far regarding school children and the occurrence of earthquakes. However, the United States cannot rely on such continued good fortune in the future. Governmental and educational leaders must fulfill their responsibilities for the safety of school children by implementing school safety programs that include the design and construction of seismically safe buildings. Such programs must emphasize seismic resistance and overall earthquake hazard resilience. Earthquake hazard mitigation is A typical unreinforced masonry high school in most readily accomplished through the the United States. (Wang, Y., EERI, 2012a) improved seismic design and construction of Similar advocacy efforts have impacted buildings, since “earthquakes don’t kill people, unsafe buildings do.” Earthquake policy across the United States. In California, hazard mitigation requires an increase in the positive steps have been taken to increase the prioritization and perceived value of seismic seismic safety of schools. The 1933 Long design within the project delivery systems of Beach earthquake resulted in passage of the the owners, construction managers, architects Field and Riley Acts. In California, no school and engineers who operate, design and child has been killed or seriously injured construct educational facilities in the United since 1933. However, no major California States. earthquakes since 1925 have occurred during school hours. The Field Act required all Over the past year, the United States public school buildings to be designed by a Geological Survey (USDI, USGS, 2012) California licensed structural engineer and recorded an average of nearly 1,500 also implemented increased review and earthquakes of magnitude 5 or greater inspection requirements. The Riley Act worldwide. Damaging earthquakes may be required specific lateral force requirements infrequent when compared to seasonal for design, and effectively outlawed natural hazards. However, earthquakes can unreinforced masonry buildings. School be very high consequence events. For buildings constructed of unreinforced schools, the consequences could be masonry present a significant danger to catastrophic for children in seismically students and teachers, but earthquakes will vulnerable school buildings should an also find the weak areas in otherwise well earthquake occur during school hours. designed and constructed buildings. Society is learning and acknowledging the need to provide “punctuated resilience to Even though United States schools have not protect against what is possible, beyond what yet experienced catastrophic damage and loss is probable" (O’Rourke, 2012). To do so will of life, major earthquakes in the rest of the The contents of this document were developed under a grant from the Department of Education. However, such contents do not necessarily represent the policy of the Department of Education, and should not assume endorsement by the Federal Government. world have taken a severe toll on schools. In New schools to be used as shelters should the 2008 Wenchuan, China earthquake an require an “immediate occupancy” or estimated 19,000 died in 7,000 schools. “operational” performance level of seismic Also, 19,000 children died while attending resistance. As a minimum, schools should be school during the 2005 Pakistan earthquake safe and usable during repair. Schools should (Maqsood & Schwarz, 2008). In 2010, be able to be occupied without restriction Haiti’s magnitude 7.0 earthquake destroyed (e.g., receive an official “green tag” by or damaged nearly 4,000 schools inspectors) after the expected earthquake (UNOCHA, 2011). 4,000 schools were badly (Maffei, 2009). damaged or destroyed in the 2010 Chile earthquake (Dillard & Leon, 2010). The 2011 Priorities for Earthquake Hazard earthquake in Christchurch, New Zealand, Mitigation in Educational Facilities resulted in 153 schools damaged, 11 seriously. 1) Establish the project management approach for the design and construction of the school including seismic resilience as a necessary measure of quality. A successful project must meet the requirements for quality, budget, and schedule. If budget and schedule are prioritized over quality, the long term success of the project is at risk. Quality cannot be judged only on operational efficiencies and aesthetic aspects. Form follows function. What is behind the walls and beneath the building This Japanese school is in session after the 2011 can ultimately determine whether the Tohoku earthquake. Notice the evidence of school meets all its intended purposes for liquefaction and settlement around the building. The building used pile foundations and was built use and occupancy over the life of the for seismic conditions. (Wang, Y., EERI, 2012b) building. a) Prepare estimates considering life- The occurrence of earthquakes cannot be cycle costs. Consider the embodied accurately predicted. Therefore policy must energy (the initial energy provided be proactive even in the least earthquake from all materials and construction in prone areas. The 2011 Virginia earthquake building the school) and include the resulted in $30 million in damage to schools benefits of seismic resistance over the in an area that had not experienced a major life of the school building. earthquake since 1875 (EERI, 2011). b) Include all Special Inspection Earthquake preparedness requires awareness requirements in the contracting training for teachers and students. School process. It is important that the children are required to temporarily stay at various roles and responsibilities the schools and essentially "shelter in place" required to implement Special during an earthquake; thus the need for Inspections are identified and the “drop, cover, and hold” drills. In addition, scopes of work included in the the local government and school board appropriate contracts early on in the should establish whether the school is to be contracting process. The Owner is used as a post-earthquake community shelter. responsible for ensuring that Special cladding, and ceilings. Although Inspections are performed and bracing and anchorage should always documented to the code authority. be provided where necessary, the 2) Hire a structural engineer with seismic code design requirements for seismic design experience. anchorage and equipment 3) For new schools, the site selection performance are also a function of the process must include geological Risk Category and Seismic Design considerations up front including Category. The building code may obtaining a Geological Survey review. exempt these requirements in lower 4) Design and construction of all schools, seismic hazard areas. at a minimum, should be in full 5) The challenge of existing buildings is compliance with the provisions of initially one of risk assessment. The appropriate building codes (ASCE, seismic risk is a function of the level of 2010; FEMA, 1998; ICC, 2012a) even if, earthquake hazard vs. the vulnerability of for whatever reason, building codes have the building. With the help of structural not been adopted in their locale. engineers, develop vulnerability a) Require a thorough geotechnical assessments of the existing buildings by report that addresses all the building screening the buildings for seismic code requirements and includes deficiencies. Utilize the “Rapid foundation recommendations and all Observation of Vulnerability and seismic design parameters such as the Estimation of Risk” software (ROVER, liquefaction potential at the site. The FEMA P-154) (FEMA, 2002; FEMA, Site (soil) Class should be determined 2011) or seismic safety checklists such as based on the shear wave velocity (vs) are included in ASCE 31 (ASCE, 2003) in the upper 30m (100 ft). and ASCE 41 (ASCE, 2006) b) Establish the Seismic Design a) Prioritize the assessment of existing Category (SDC) based on the hazard buildings that were not designed to maps, the Risk Category and the Site modern building codes, generally Class. The Risk Category is a considered to be 1976 and later. In function of the occupancy group of some places, such as Oregon and the building. Schools are normally parts of the central US, modern considered Risk Category III, but if seismic codes were not adopted until used as shelters they should be decades later. Changes in the hazard considered to be Risk Category IV. maps and/or the “zones” of the older The SDC ranges from A (virtually no codes should also be considered in seismic design is performed) to SDC determining to what extent a building F. SDC D is the default if soils meets current seismic design information is inadequate to properly requirements. establish the shear wave velocity. b) Prioritize the identification of and c) Non-structural elements require risk reduction for unreinforced anchorage to the primary seismic masonry buildings (FEMA, 2009). force resisting structural system of c) Prioritize the identification of and the building. These components of risk reduction for non-ductile the school building include concrete buildings, multi-story mechanical, electrical and plumbing schools with weak stories, and those systems, equipment,
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