What ASCE 7 Covers
ASCE 7, Minimum Design Loads and Associated Criteria for Buildings and Other Structures, is published by the American Society of Civil Engineers. The current edition is ASCE 7-22. It is adopted by reference in the International Building Code (IBC) and the Florida Building Code (FBC), and is referenced by the Saudi Building Code (SBC) and other international standards. Any structural engineer working on US projects must know ASCE 7 in depth; any engineer working internationally encounters it regularly as a baseline reference.
Wind Loads — Chapters 26–31
Wind load determination in ASCE 7-22 begins with the basic wind speed (V), taken from the ASCE 7-22 wind speed maps for Risk Categories I through IV. The ultimate design wind speeds range from approximately 85 mph in sheltered interior locations to over 185 mph in Florida's High-Velocity Hurricane Zone. From the basic wind speed, the velocity pressure is derived: q = 0.00256 × Kz × Kzt × Kd × Ke × V². Exposure category (B, C, D), topographic factor, directionality factor, and ground elevation factor all modify the reference pressure. ASCE 7 Chapter 27 covers the Envelope Procedure for enclosed buildings; Chapter 28 covers the Simplified Method; Chapters 29–31 cover other structures including open signs, chimneys, and towers — directly applicable to our entertainment tower projects.
Seismic Loads — Chapters 11–23
ASCE 7-22 seismic provisions define the seismic design requirements for all US buildings. Site class determination (from geotechnical data) modifies mapped spectral accelerations Ss and S1 using site coefficients Fa and Fv to produce design spectral accelerations SDS and SD1. From these, the Seismic Design Category (SDC) is determined — SDC A through F, with SDC D, E, and F triggering the most stringent AISC 341 seismic detailing requirements. The equivalent lateral force procedure of Chapter 12 applies to most structures; response spectrum analysis (Chapter 12) or time-history analysis (Chapter 16) is required for irregular or complex structures.
Snow, Rain, and Other Loads
ASCE 7-22 Chapter 7 covers snow loads, including balanced snow, unbalanced (drift) snow at parapets and higher roofs, sliding snow, and rain-on-snow surcharge. Chapter 8 covers rain loads and ponding. Chapters 4–6 cover dead loads, live loads, and soil/hydrostatic loads. The load combination tables of Chapter 2 assemble all load types into the factored combinations used for LRFD design and the allowable stress combinations used for ASD design.
How We Apply ASCE 7
We apply ASCE 7-22 on all US projects and as a reference methodology on international projects where the local code (SBC, for example) references ASCE 7 with national modifications. For every project, we document the wind speed, exposure category, topographic factors, and all parameters used in the wind pressure derivation explicitly in the design report — allowing any reviewer to verify the load determination independently without recalculating from first principles.