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

Related Articles


Modal response spectrum analysis

Modal response spectrum analysis

Modal response spectrum analysis

Dear experts

Regarding to the calculation of the response spectrum parameter as per UBC-97 item 1631.2 and 1631.5.4 the elastic response spectrum should be divided by (R/g) but in ASCE-05 item 12.9.2 the elastic response spectrum should be divided BY (R/I),and the different between two values is very high for example
UBC value =4.5/9.81 =0.459
ASCE value =4.5/1.2 =3.75
My question is there any item in ASCE code mentioned that we should take the effect of the (g) acceleration in the calculation of the response spectrum.

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!


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close