how to calculate the seismic load of CMU screen wall

[dcceecy]

I have a 12" CMU wall (solid grouted) with 13.3' high. it is a screen wall. the verical reinforcement is #6 @ 18" OC

I have calcualted the SDs=0.61, SD1=0.58 (design spectral response).

How to calculate lateral seismic load?

Thanks

 

[msquared48]

Are you sure of the reinforcing? Usually CMU reinforcing is on an 8" module. I would expect 16" on center.

Just use the pertinent IBC equations for the lateral seismic forces.

Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask

 

[lsmfse]

Agree with Mike on the spacing-See ASCE 13.3

 

[WillisV]

See 12.11.1 of ASCE 7-05. Apply force indicated as a lateral force at center of wall mass (0.4SdsI).

 

[dcceecy]

yes. it is 16" OC.

in the formula 0.4SDsI, is that I can be same as the adjacent building.

Thanks.

 

[vandede427]

When I do seismic calcs on a cantilevered fire wall or screen wall, I break the wall into 4 quadrants of height and run the numbers as a 4 story building. I beleive this is conservative but it helps in the p-delta calc and the top heavy nature of a tall cantilevered wall.