Question: A three - storey building has interior columns spaced 8 m apart in two perpendicular directions. Given design loads: Roof: D L = 6 kPaLL

A three-storey building has interior columns spaced 8 m apart in two perpendicular directions.
Given design loads:
Roof: DL=6kPaLL=0
Floor: DL=8kPa (typical each floor)
LL=2.5kPa (3rd floor)
LL=7kPa (2nd floor)
In accordance with NSCP 2015 provision: Sec. 205.6
As an alternate to Equation (205-1), the unit live loads set forth in Table 205-1 may be reduced in accordance with Equation
(205-3) on any member, including flat slabs, having an influence area of 40m2 or more.
L=Lo(0.25+4.57AI2),(205-3)
where L0= unreduced design live load per square meter of area supported by the member
AI= influence area
L= reduced design live load per square meter of area supported by the member
The influence area AI is four times the tributary area for a column, two times the tributary area for a beam, equal to the
panel area for a two-way slab, and equal to the product of the span and the full flange width for a precast T-beam. The
reduced live load shall not be less than 50 percent of the unit live load Lo for members receiving load from one level only,
nor less than 40 percent of the unit live load Lo for other members.
Based on the tributary area of an interior column, what is the total axial load on a column at the second floor due to the
service live load?
A three - storey building has interior columns

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