Building Code Glossary
Seismic-force-resisting System: Building Code Definition
How the IBC 2009 define seismic-force-resisting system, where the wording differs, and which chapters depend on the term.
On this page
Last updated September 7, 2026 · Definitions quoted from the 2009 International Codes as transcribed in this site's building-codes collection, with the source chapter linked for each quotation. Usage counts are computed over the chapters hosted here, one copy per code. The [ICC code library](https://codes.iccsafe.org/codes) publishes the current model text and the [ICC adoption maps](https://www.iccsafe.org/advocacy/code-adoption-maps/) show which edition a jurisdiction has adopted; those sources control.
Direct answer
Seismic-force-resisting system is a defined term in the International Building Code (IBC) 2009, in Structural Design. The code's own words are: “That part of the structural system that has been considered in the design to provide the required resistance to the prescribed seismic forces.” No other I-Code in this corpus defines it, so the IBC 2009 definition is the one to work from. The term is used in 4 chapters of this corpus, most often in Structural Tests and Special Inspections (IBC 2009), Structural Design (IBC 2009), Concrete (IBC 2009). These pages transcribe the 2009 model text; verify the definition against the edition and amendments your authority having jurisdiction has adopted. Record the jurisdiction, the adopted edition, the application date and any local amendment that rewrites the definition before you use it on a live project, because a term redefined by amendment changes every requirement that depends on it.
Content and cited inputs reviewed by Scott Barrington, Harth founder and architectural technology specialist · Published 2026-09-07 · Updated 2026-09-07.
What does this term mean?
Seismic-force-resisting System — IBC 2009, Structural Design:
That part of the structural system that has been considered in the design to provide the required resistance to the prescribed seismic forces.
What must be verified before using this guidance?
Seismic-force-resisting System is defined once in this corpus, in the Structural Design chapter of the International Building Code (IBC) 2009:
That part of the structural system that has been considered in the design to provide the required resistance to the prescribed seismic forces.
Where seismic-force-resisting system is used in the code
The term appears in 4 chapters of the 2009 I-Codes hosted here. The chapters that lean on it hardest are the ones to read next.
| Chapter | Code | Mentions |
|---|---|---|
| Structural Tests and Special Inspections | IBC 2009 | 11 |
| Structural Design | IBC 2009 | 8 |
| Concrete | IBC 2009 | 3 |
| Definitions | IBC 2009 | 1 |
The term in use
How the code actually writes about seismic-force-resisting system, quoted from the 2009 text hosted here:
Each contractor responsible for the construction of a main wind-or seismic-force-resisting system, designated seismic system or a wind- or seismic-resisting component listed in the statement of special inspections shall submit a written statement of responsibility to the bUilding official and the owner prior to the commencement of work on the system or component.
- Structural systems designated as part of the seismic-force-resisting system shall be restricted to those permitted by ASCE 7.
The terms seismic-force-resisting system is built out of
The definition above leans on 1 other defined term. Each carries its own code definition, and a local amendment to any of them changes what seismic-force-resisting system covers:
- System — IFC 2009: An assembly of equipment consisting of a tank, container or containers, appurtenances, pumps, compressors and connecting piping.
Seismic-force-resisting System: what to open, and in what order
Every row is a document this term depends on. The ICC code library and the ICC adoption maps cover the middle rows.
| Check | Where | Confirmed |
|---|---|---|
| Read the definition in the adopted IBC | Structural Design | |
| Re-check the requirement that uses it | Structural Tests and Special Inspections (IBC 2009) | |
| Re-check the requirement that uses it | Structural Design (IBC 2009) | |
| Re-check the requirement that uses it | Concrete (IBC 2009) | |
| Re-check the requirement that uses it | Definitions (IBC 2009) | |
| Confirm the dependent definition | System | |
| Local amendment to any of the above | Jurisdiction's amendment list |
A research aid, not a code determination. The authority having jurisdiction decides which edition and which amendments apply.
Where can you explore related guidance?
- Explore all glossary guidance
- System: Building Code Definition
- Design Flood Elevation: Building Code Definition
- Loads: Building Code Definition
- Seismic Design Category: Building Code Definition
Sources and method
Definitions quoted from the 2009 International Codes as transcribed in this site's building-codes collection, with the source chapter linked for each quotation. Usage counts are computed over the chapters hosted here, one copy per code. The ICC code library publishes the current model text and the ICC adoption maps show which edition a jurisdiction has adopted; those sources control.
Source links
Frequently asked questions
What is the code definition of seismic-force-resisting system?
The International Building Code (IBC) 2009 defines it in Structural Design as: “That part of the structural system that has been considered in the design to provide the required resistance to the prescribed seismic forces.” The 2009 model text is reproduced here; the definition that binds your project is the one in the edition your jurisdiction has adopted, as amended locally.
Which parts of the code depend on seismic-force-resisting system?
In this corpus the term is used across 4 chapters, led by Structural Tests and Special Inspections in the IBC 2009. Those are the sections whose scope moves if the definition is amended locally, so read them together with Chapter 2 rather than on their own.
What are seismic building codes?
Building is a separate defined term. The IBC 2009 defines it as: “Any structure used or intended for supporting or sheltering any use or occupancy.” That is not the same as seismic-force-resisting system, which the IBC 2009 defines as “That part of the structural system that has been considered in the design to provide the required resistance to the prescribed seismic forces.” — read both before applying either, and confirm the wording in the edition your jurisdiction has adopted.
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