PPD | Understanding Structural Systems and Seismic Impact of Design [Exercise B]

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Property 1=PPD Understanding Structural Systems and Seismic Impact of Design [Exercise B]

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Hello, can I get a more detailed explanation of how to solve question 9: “Within the program, the client specifies a 80’x50’ rectangular assembly space with movable chairs. The footing on the perimeter of the foundation wall is designed to be 1’ wide within silty clay. Which of the following statements are accurate?”

I understand how to get the vertical foundation pressure from IBC Table 1806.2, but not sure the logic behind how to calculate footing size required to support live load.

Thank you in advance!