An Overview of the Structural Changes to the 2024 IBC
As is well known by now, changes in a new edition of the IBC result primarily from changes in the referenced standards adopted by the IBC. The primary reference standards that have changed from the 2021 to the 2024 IBC are: ASCE 7-22 replacing ASCE 7-16 (including Supplement 1); TMS 402/602-2022, in place of TMS 402/602-2016; AISC 360-22 and 341-22 instead of AISC 360-16 and 341-16; and NDS-2024 in place of NDS- 2018. The concrete standard remains unchanged at ACI 318-19.
In this seminar, we discuss changes in IBC Chapter 1, Scope and Administration; Chapter 2, Definitions; Chapter 16, Structural Design (changes that are not the result of the switch from ASCE 7-16 to ASCE 7-22); Chapter 17, Special Inspections and Tests; Chapter 18,Soils and Foundations; Chapter 19, Concrete; Chapter 21, Masonry; Chapter 22, Steel; and Section 3103, Temporary Structures (these changes are extensive and highly significant).
Seismic Design Provisions of ASCE 7-22
ASCE 7-22 is adopted by the 2024 IBC and the 2025 CBC. The 2025 Oregon Structural Specialty Code (OSSC) became effective on October 1, 2025 and will become mandatory on April 1, 2026 upon the expiry of a six-month grace period. It is based on the 2024 IBC and adopts ASCE 7-22. The changes from ASCE 7-16 to ASCE 7-22 are numerous and substantive. The chapter on flood loads is the only chapter that has escaped any change. There are huge changes in snow load, ice load, and tsunami load provisions. There is a whole new chapter (32) on tornado loads. Luckily, Oregon is free of tornadoes and the chapter does not apply. The changes in Chapters 11-23 on earthquake loads and Chapters 26-31 on wind loads are many and many of the seismic changes mark significant departures from past practice. ASCE 7-22 load combinations and importance factors are also quite different because of changes in the load chapters.
The changes in Chapter 11, Seismic Design Criteria, which interfaces with Chapter 21, Site-Specific Ground Motin Procedures for Seismic Design, are profound, have far-reaching consequences, and must be understood clearly, if safe seismic design is to continue. The second part of this seminar focuses on Chapter 11 and Chapter 12, Seismic Design Requirements for Building Structures, which has undergone many important changes. It also provides a brief overview of important changes in Chapter 13, Seismic Design Requirements for Nonstructural Components.
About S.K. Ghosh
S. K. Ghosh, Ph.D. heads the consulting practice, S. K. Ghosh Associates LLC, Palatine, Illinois, now a subsidiary of the International Code Council. Dr. Ghosh is active on many national technical committees, is an Honorary Member of ACI, and is a Fellow of ASCE, SEI, and PCI. He is a Consulting Member of ACI Committee 318, Standard Building Code as well as ACI-PCI Committee 319, Structural Precast Concrete – Code Requirements and Commentary. He is an Emeritus Member of the ASCE 7 Standard Committee (Minimum Design Loads for Buildings and Other Structures). He is a former member of the Boards of Direction of ACI, the Earthquake Engineering Research Institute and the Building Seismic Safety Council. He is a former member of the Board of Governors of ASCE’s Structural Engineering Institute.
Dr. Ghosh has influenced seismic design provisions in the United States for many years. In addition to authoring many publications in the area of structural design, Dr. Ghosh has investigated and reported on structural performance in most recent earthquakes. He recently led a World Bank project on building code enforcement in Dhaka, Bangladesh.
About Kelly Cobeen
Kelly Cobeen, S. E. is a Principal with Wiss Janney Elstner Associates in their San Francisco area office and is a registered Civil and Structural Engineer with more than 30 years of experience. Her work includes a wide range of project types, sizes and construction materials, with a special interest in wood and light-frame construction. She has been involved in numerous code development, research and educational activities; including serving on the Provisions Update Committee for the NEHRP Provisions, the ASCE/SEI-7 Seismic Subcommittee, the AWC Wood Design Standards Committee, participating in code-development hearings, and involvement in a number of BSSC and ATC seismic-related projects. Kelly is a past President of the Structural Engineers Association of California (SEAOC) and the immediate past Chairperson of the Board of the Applied Technology Council (ATC).