×
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

IBC 2000/2003 Response Modification Factor R for dual systems

IBC 2000/2003 Response Modification Factor R for dual systems

IBC 2000/2003 Response Modification Factor R for dual systems

(OP)
IBC 2000 / IBC 2003 Table 1617.6.2 shows a building response modification factor "R" for a dual system of IMRF (I assume it could be of either steel or concrete
material) with Ordinary Reinforced Concrete Shear Wall as 5.5.

In the same table it shows, R = 5.0 for an Ordinary Reinforced Concrete Shear Wall, R = 5.0 for a concrete IMRF and R = 4.5 for a steel IMRF.

Why is that the R value of the dual system higher than those of the individual systems?

Thanks

RE: IBC 2000/2003 Response Modification Factor R for dual systems

Dual systems have more redundancy built in - the moment frames are required to carry a minimum of 25% of the story shear even if their actuall stiffness does not attract that much.

See:  thread507-162685

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