ARCE 226 – Guyader
HW
Structural Systems for Engineers
HW 7
For the building shown below:
se a wind pressure of 17psf from 0 to 15ft.
se a wind pressure of 20psf from 15ft to 25ft. Do not use a conservative approximation – use the exact pressures as stated.
oof DL= 20psf
loor DL = 30psf
xternal Wall weight = 13psf
= (0.175 ? W ) (Base Shear equation)
t )Wx hx
x = (VP?F
(distribution of base shear over height of bldg.) In this case
n
Wh
Ft = 0.
Fall 2022
i=1
i i
1
ARCE 226 – Guyader
HW
Structural Systems for Engineers
1. Find the governing lateral load in both directions – wind or seismic and at both
levels.
Using the governing load in the N/S direction:
2. Find the drag forces in the roof along grid line 1,2 and 3 and in the first floor
diaphragm along along grid line 1 and 3. (draw the axial force diagram) and find
the max drag force.
Fall 2022
2
ARCE 226 – Guyader
HW
Structural Systems for Engineers
3. Find the maximum chord forces in all diaphragms. Note that the discontinuous
shear wall on the 2nd floor will deliver a load to the diaphragm below which will
affect the shear and moment diagram of that diaphragm.
4. Find the hold-down forces at the bottom of both shear walls on the first floor. To
do this, assume the tributary width to each wall is 12ft.
Fall 2022
3

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