×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Seismic Response Modification Factor - 2-story wood home w/daylight basement

Seismic Response Modification Factor - 2-story wood home w/daylight basement

Seismic Response Modification Factor - 2-story wood home w/daylight basement

(OP)
Just out of curiosity, what do most people use for the R-value for the situations where you have (2) stories of wood walls above concrete retaining walls on (3) sides and wood on the front of the daylight basement?

RE: Seismic Response Modification Factor - 2-story wood home w/daylight basement

(OP)
Bump:

I'm debating with a friend over this issue and the argument is whether or not to use R=6.5 or R=4.0. Just want an opinion from this forum as there is usually a lot of help here.

Thanks.

RE: Seismic Response Modification Factor - 2-story wood home w/daylight basement

6.5

Don't penalize the wood. If you really want to, you could do a two stage analysis.

RE: Seismic Response Modification Factor - 2-story wood home w/daylight basement

If you've got a daylight basement, then two of the concrete sides have steeply sloping grades, right? If so, I'd take your seismic base to be the basement floor elevation and treat your building as a three story structure. You're probably already doing this.

Because of the stiffness difference between the wood and concrete shear walls, I'd be concerned that the basement will tend to act as a three sided system. Consequently, I vote for the use of a conservative R value.

The greatest trick that bond stress ever pulled was convincing the world it didn't exist.

RE: Seismic Response Modification Factor - 2-story wood home w/daylight basement

Poured concrete retaining walls with rebar and cross-ties at the two corners?
Or CME that is not strongly linked together at the corners with anything but the mortar?

reason I ask is the " full height" of the front wall and the two side walls are actually two stories, right?

RE: Seismic Response Modification Factor - 2-story wood home w/daylight basement

(OP)
I'm treating it as 3 stories: 2 wood framed stories above a daylight basement. Basement has 3 sides that are full height concrete and the front is wood.

I'm torn between 6.5 and 4 at this point.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources