ASME TR A17.1-8.4–2020 pdf download.Guide for Elevator Seismic Design.
1-2 INTRODUCTION Formanyyears,U.S.andCanadianmodelbuildingcodes such as the Uniform Building Code (UBC), Standard (Southern) Building Code (SBC), and National Building Code of Canada (NBCC) differentiated the force levels expected during seismic activity by zones. For example, a building in a zone 1 location was expected to see lower seismic forces than a building in a zone 2 location. A United States Geological Survey (USGS) map of the U.S. (see Figure 1-2-1), published in the various building codes, indicated the appropriate zone for any part of the country. Seismic requirements were first specified in ANSI/ ASME A17.1-1981, Appendix F. They were based on ANSI A58.1, the American National Standard Building Code Requirements for Minimum Design Loads in Build- ings and Other Structures. Seismic force levels that the elevator must withstand would vary based on whether the subject building was in a zone 2 or zone 3 location. Zone 1 locations did not have elevator seismic require- ments. Therefore, to determine elevator seismic forces for any part ofthe country, one would review the appro- priate adopted building code for that particular location, determinethe zoneforthatlocation fromthe seismiczone map used by that building code, and then reference the appropriate elevator forces for that zone in ANSI/ASME A17.1.
1-4 ð20Þ USING IBC/ASCE 7 FOR ELEVATOR SEISMIC DESIGN (QUICK REFERENCE) Byobtainingthe followingIBC parameters, the need for elevator seismic design and required seismic force levels can be determined: (a) Seismic Design Category (SDC) (b) I p (c) S DS (d) location of the base of the building (e) average roof height of the building For quick reference, Table 1-4-1 compares the hori- zontal force generated by the IBC parameters (at the worst-case height ratio) and the equivalent seismic zone(s) force(s).
1-5 SUMMARY Whileattimesrequiringslightlyincreasedseismicforce levels in the upper halfofthe building, particularly in the area ofrail bracket selection and spacing, adoption ofthe IBC/NBCC seismic force levels might result in less-strin- gent seismic forces in the lower half of the building than arecurrentlyrequiredbyASMEA17.1/CSAB44.UseofIBC contour maps and the NBCC seismic data chartmayintro- duce seismic requirements in areas that had been tradi- tionallynonseismic. Regardless ofthe changes these force levelswilldictate,thebenefitsofclarityinthecodeanduse of the latest and most accurate information in seismic force protection are warranted.ASME TR A17.1-8.4 pdf download.