ASCE describes the means for determining design loads including dead, live, soil, flood, tsunami, snow, rain, atmospheric ice, earthquake, wind, and fire, as well as how to assess load combinations. Significant changes in ASCE include the following: new seismic maps reflecting the updated National Seismic Hazard Maps; new wind speed maps, including new Hawaii maps, that result in reduced wind speeds for much of the United States, clarified special wind study zones, and separate Risk Category IV from Category III; new snow load maps incorporating regional snow data for areas that previously required site-specific case study zones; updated rain duration provisions that align design requirements with International Plumbing Code provisions for drainage; entirely new chapter covering tsunami design provisions, which are important to Alaska, Hawaii, California, Oregon, and Washington; and new appendix provisions for fire design. Standard provisions are accompanied by a detailed commentary with explanatory and supplementary information developed to assist users of the standard, including design practitioners, building code committees, and regulatory authorities. Structural engineers, architects, and those engaged in preparing and administering local building codes will find the structural load requirements essential to their practice.
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Therefore the old provision that used qh as the velocity pressure is not in accord with the physics of the ase. For further questions please contact our TIB customer service. In general, the force components, bending moments, and so forth were found comparable in both exposures, although GC p f values associated with Exposure B terrain would be higher than that for Exposure C terrain because of reduced velocity pressure in Exposure B terrain. Guidelines for Seismic Rehabilitation of Buildings: It does not include allowances for across-wind loading effects, vortex shedding, instability due to galloping or flutter, or dynamic torsional effects. The other had moment-resisting frames in one direction, positioned at the same acse as the roof trusses, and diagonal wind bracing in the other direction. One is for acceleration dependent short period structures the other is for velocity dependent intermediate and long period structures.