Structural response modification factors
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Structural response modification factors

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Published by The Council in Redwood City, Calif .
Written in English

Subjects:

Places:

  • United States.

Subjects:

  • Earthquake engineering -- United States,
  • Earthquake resistant design -- United States

Book details:

Edition Notes

Statementby Applied Technology Council ; principal investigator, Christopher Rojahn.
ContributionsRojahn, Christopher., Whittaker, Andrew Stuart., Hart, Gary C., Bertero, Vitelmo V., Applied Technology Council.
Classifications
LC ClassificationsTA654.6 .S867 1995
The Physical Object
Paginationix, 64 p. :
Number of Pages64
ID Numbers
Open LibraryOL603975M
LC Control Number96198376
OCLC/WorldCa35191642

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Additional Physical Format: Online version: Structural response modification factors. Redwood City, Calif.: The Council, (OCoLC) Document Type. 3. Response Modification Factor In the force-based seismic design procedures, the response modification factor (R) is the one used to reduce the linear elastic response spectra to the inelastic ones. In other words, response modification factor is the ratio of strength required to maintain the structural elasticity.   Hence, classification of Response Modification Factor for various structural systems is extremely important in order to do an evaluation based on demand and capacity of the structure. The Response Modification Factor (R factor) reduces the seismic force to a design level as it is assumed that structures contain reserve strength, an extra energy Cited by: 2. From previous study it is noted that the ‘R’ factor depends on ductility factor (Rµ), strength factor (Rs), structural redundancy (RR) and damping associated with structure. The objective of this work is to evaluate the response modification factor (R) for RC elevated water tanks supported on framing system are considered having staging.

  For additional commentary regarding the Response Modification Factor, FEMA gives the following clarification: "The ratio R, is always larger then ; thus, all structures are designed for forces smaller than those the design ground motion would produce in a structure with completely linear-elastic response. a. Response modification coefficient, R, for use throughout the R reduces forces to a strength level, not an allowable stress level.: b. Deflection amplification factor, C d, for use in Sections , , and of ASCE c. NL = Not Limited and NP = Not Permitted. For metric units use m for ft and use m for ft. overstrength factor of ASCE 7 – § shall be used (i.e., 0 = assumed). Load combinations are a way of considering the maximum (or minimum) forces on a structural element using principles of superposition. The load combinations consider combined effects of . Structural Response Modification Factors by APPLIED TECHNOLOGY COUNCIL Twin Dolphin Drive, Suite Redwood City, California Funded by NATIONAL SCIENCE FOUNDATION Grant No. ECE and NATIONAL CENTER FOR EARTHQUAKE ENGINEERING RESEARCH NCEER Project No. PRINCIPAL INVESTIGATOR Christopher Rojahn PROJECT CONSULTANTS .

  Structural Response Modification Factor Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. If you continue browsing the site, you agree to the use of cookies on this website. R factor values in UBC for moment resisting frames (MRF) 20 Basic value of response factor q 0 in Eurocode 23 Values of kD represent ductility class in Eurocode 24 Values of kR reflecting structural irregularity in elevation in Eurocode 24 Comparison of R factor for EC-8, Japan and Mexico seismic codes Structural engineers practicing in regions of high seismicity have been wrestling with the complexities of designing safe structures to resist seismic activity for years beginning with the rebuilding effort following the San Francisco earthquake.   So, we have to reduce the forces acting on the structure by R Ω factor which accounts for structural over-strength and then design the structure with appropriate material properties and phi factors. Thus, the combination of the two gives us the correct response reduction factors.