2020 NEHRP Recommended Seismic Provisions for New Buildings and Other Structures: Volume I, Parts 1 and 2 (FEMA P-2082-1)

The 2020 NEHRP Recommended Seismic Provisions for New Buildings and Other Structures provides detailed regulations and standards for nonbuilding structures regarding seismic forces. It offers guidance on seismic design ground motions, provisions for boilers, pressure vessels, and liquid storage tanks, and consensus standards for various structures. The document emphasizes the importance of seismic analysis, including linear analysis as a prerequisite for nonlinear response history analysis, and the use of conditional mean spectra for target response spectrum selection. Ground motions are selected based on source mechanisms, magnitude, site soil conditions, usable frequency, and site-to-source distance, with spectral shape being a primary consideration. Ground motion modification techniques such as amplitude scaling and spectral matching are discussed to ensure compatibility with the target spectrum.