CE 243A Behavior & design of RC Elements Prof. J. W. Wallace Fall 04 2 CE243A 3 1971 San Fernando Earthquake … Three building heights of 17 m, 41 m Earthquake Faults are: Types A, B and C. (Type A has the highest risk). Sb - Rock . The New Madrid seismic zone in Central U.S. endstream endobj startxref The ground accelerations associated with the Zones were probabilistic based and correlated to prescribed levels of ground accelerations with Zone 4 being the highest and 0 being negligible. Zone 1 has a low likelihood of seismic activity, and Zones 2A and 2B have moderate levels. The earthquake catalogue indicates that the occurrence of earthquake swarms is not infrequent. Zones 3 and 4 have the most potential for catastrophic destruction. SeismicZone gives G&G buyers and sellers access to quality assured seismic data via a virtual seismic data brokerage. �0? Example: "The New Madrid Seismic Zone." areas near an active fault line). This may mean that seismic activity is incredibly rare, or that it is extremely common. A seismic zone is an area of seismicity probably sharing a common cause. The circular stipulates two zone categories in its seismic code. After ICBO, 1994 (This map was redrawn from the original source, if differences occur, the original source should be used). �����YL����8g0�1�0`�?��`�ajahe�^�Ŀ6��)�Q��I� �D!Sf��Lw�f�0y5AD� �"� This resource page provides an introduction to the concepts and principles of seismic design, including strategies for designing earthquake-resistant buildings to ensure the health, safety, and security of building occupants and assets.The essence of successful seismic design is three-fold. Nowhere really, they like much of engineering have just evolved into ever increasing sophistication and refinement. Celebrating 100 Years of Structural Engineering, The LARK Hotel’s 4-Story Addition, a New CLT Building in Bozeman, CLT or Cross-Laminated Timber Construction, Academy Square on Vine reaches back up to grade, Two Nishkian Menninger Projects Win 2018 ENR Regional Best Projects Awards. The large zones have been replaced by more detailed contour maps that provide a more refined representation of potential seismic ground shaking in a given location with a consistent return period. The maps evolved over time including the addition of a Seismic Zone 4 in 1976 and the division of Zone 2 into 2A and 2B in 1988. Zone = 2A, seismic zone coefficient Z = 0.15 . Soil: Sa - Hard rock . Seismic Zones Zone 0 = 0 g Zone 1 = 0.075 g Zone 2A = 0.15 g Zone 2B = 0.20 g Zone 3 = 0.3 g Zone 4 = 0.4 g Source: 1997 Uniform Building Code, Copyright 1997. Associate Professor University of California, Los Angeles CE243A 2 1971 San Fernando, California Earthquake. endstream endobj 13 0 obj <>/OCGs[34 0 R]>>/Pages 10 0 R/Type/Catalog>> endobj 14 0 obj <>/Font<>/ProcSet[/PDF/Text/ImageB/ImageC]/XObject<>>>/Rotate 0/TrimBox[0.000015 0.0 1080.0 1800.0]/Type/Page>> endobj 15 0 obj <>stream 47 0 obj <>stream Thus, as … Each zone also has specific structural detailing requirements. The estimate is expressed as a percentage of the replacement value with regard to earthquake damage to improvements likely to occur during a seismic event. Seismic zone factors are assigned to each zone; Zone 0 = 0, Zone 1 = 0.075, Zone 2A = 0.15, Zone 2B = 0.20, Zone 3 = 0.3, and Zone 4 = 0.4. Se - … Seismic Zones are a vestige of the Uniform Building Code or UBC and were introduced in the 1949 edition when the USA seismic hazard map, published in 1948 by the US Coast and Geodetic Survey was adopted into the UBC. %%EOF endstream endobj 16 0 obj <>stream The mixed-use development project at 1341 Vine Street in Los Angeles, CA has nearly completed the below-grade parking structure, and is... On October 9, 2018, Engineering News-Record (ENR) honored two Nishkian Menninger projects in its 2018 ENR Regional Best Projects Awards.... Seismic Zones are a vestige of the Uniform Building Code or UBC and were introduced in the 1949 edition when the USA seismic hazard map, published in 1948 by the US Coast and Geodetic Survey was adopted into the UBC. Facebook Twitter Google Email Earthquakes Hazards Data Education Monitoring Research. Questions or comments? The maps will continue to evolve and future versions will map based on a measure of consistent risk for damage to new structures rather than seismic return periods. The 1949 maps were intended to be a better representation of the potential seismic accelerations of various regions or Zones throughout the US and ranged from 0 to 3. When in Seismic Zone 4, near a type A fault, we need to know the Jobsite address or the distance of the jobsite from the fault, if less than 10km. October 6, 2004 17:23 WSPC/124-JEE 00177. This indicates that all components in buildings constructed in seismic zones 2 and higher must be designed. Uniform Building Code (UBC); however, was published in 1927 by the Pacific Coast Building Officials (PCBO), contained an optional seismic appendix, that used a coefficient C’ which ranged from 7.5% to 10% g (% of gravity applied as a lateral inertial load). This program can be used to obtain the earthquake ground motion parameters needed to design structures for specific geographic locations in accordance with the latest building code reference documents. Seismic Code Requirements John W. Wallace, Ph.D., P.E. ����˦����)���x�l0���� ����beti�ݛǙ�=q�x/>uzg(7�������b����sǛ���M�{#����w[t���X����݋{,�`��T ���u�R�������OlZ��H�b^$)h!be��ԫ���n�����v^�*��`�{�`��eȻ��~ES���3^ ţ�Z{�V�>)��r�;C��|��b��a���s�����)/n���u&�fg��}���ͳ�a'�����E�0TvZ ����ێy@�N Seismic Zone classifications are: 4, 3, 2a, 2b and 1. Leave a Comment. h��Vmo�6�+�1�QE� E NJ� k3��2,��b�dH������Dʲ�t�0`Τ�{��!%)! According to the present zoning map, Zone 5 expects the highest level of seismicity whereas Zone 2 is associated with the lowest level of seismicity. There are 4 zones, with Zone 1 being the least threatened by seismic activity, and Zone 4 being the most threatened (ie. 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