foundation system of burj al arab

Site Classification for Earthquake Design, IBC (Part-1)

Dear reader, here we will discuss about site classification according to international building codes. This term is usually related to earthquake design. In our few upcoming posts, we will try to introduce IBC requirements in designing foundation in relation to earthquake perspective.


Depending on soil properties of construction site, sites are classified as

• Class A
• Class B
• Class C
• Class D
• Class E
• Class F


Dear reader in following table we will define site classification:
Site Classification for Earthquake Design

Site class F:


If any profile of soils have any of following or combination of following characteristics:


1. Soils susceptible to potential collapse or failure under earthquake loading like liquefiable soils, clay having high sensitive and quick clay, collapsible loosely cemented soils.


2. Clays having high organic content and or peats having thickness of layer more than10 feet


3. Clays having very high (PI>75) plasticity; layer thickness more than 25 feet.


4. Stiff clays (soft to medium) of very thick (greater than 120 feet).

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