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SDM Vol. 1 Example 44 - Beam tie

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Hi,
 
In the design example(p. 138), the minimum tie force Eh between two beams is 0.5CaI times the dead load plus live load supported on the beams per Section 1633.2.5.
 
Can someone explain it to me if the live load includes roof live load or just the floor live load? If we have to include the roof live load, what is the reason behind it?
 
Thanks!
 
Julian Chu
Newport Beach, CA