AECT360-Lecture 27.pdf - Lecture 27 – Seismic Loads per IBC Analysis of earthquake induced strong ground motion is a multi-discipline study of geology

AECT360-Lecture 27.pdf - Lecture 27 – Seismic Loads per...

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Lecture 27 - Page 1 of 11 Lecture 27 – Seismic Loads per IBC Analysis of earthquake induced strong ground motion is a multi-discipline study of geology, soil mechanics, seismology, structural dynamics, mechanical vibration, probability, and statistics. It is an evolving science. Great research efforts are undertaken annually through the federal, state and private sectors to develop accurate methods of prediction, analysis, design and retrofit to lessen the impact of potentially catastrophic earthquakes. The seismic structural design portion of the IBC greatly simplifies the underlying science of strong ground motion and is incorporated into Sections 1613. Section 1613 – Earthquake Loads List of seismically-related definitions used throughout the remainder of the Code. Section 1613.1 – Scope “Every structure and portion thereof, including nonstructural components that are permanently attached to structures and their supports and attachments, shall be designed and constructed to resist the effects of earthquake motions in accordance with ASCE 7, excluding Chapter 14 and Appendix 11A.” Exceptions (earthquake analysis not required) : 1. Detached one- and two-family dwellings in Seismic Design Categories A, B or C. 2. Seismic-force-resisting wood-framed structures complying with IBC Section 2308. 3. Agricultural buildings with no human occupancy. Section 1613.5.3 – Site Coefficients and adjusted maximum considered earthquake spectral response acceleration parameters Ground motion accelerations are determined from IBC Figure 1613.5. These include: S s = Earthquake spectral response acceleration at short (0.2 sec.) periods.
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