×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• Best Of All, It's Free!

*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.

# Minimum allowable frequency of a structure - Eurocode provision?

## Minimum allowable frequency of a structure - Eurocode provision?

(OP)
Hello everyone, i am designing a two storey RC Frame house according to Eurocode. My question is, is there any EC8 provision that sets a minimum for the fundamental frequencies for certain types of structures?

Regards

### RE: Minimum allowable frequency of a structure - Eurocode provision?

I'm not aware of any special provision for the fundamental frequencies in EC8. However, the drift limits will probably govern if the stiffness of your structure is too low.

### RE: Minimum allowable frequency of a structure - Eurocode provision?

(OP)
Hi,

are you referring to the interstorey drift sensitivity coefficient?

EC8-1: 4.4.2.2 (2) Eq. 4.28

θ = (Ptot x dr) / (Vtot x h) ≤ 0.1

### RE: Minimum allowable frequency of a structure - Eurocode provision?

Not exactly. That theta coefficient is used to determine the sensitivity of the structure to global second-order effects and wheter they should be taken into account into the global analysis of the structure or not. It is directly correlated to the building stiffness, and you do need to check it during your analysis.
However, I was talking specifically about the damage limitation requirements that need to be satisfied with the limitation of the interstorey drifts (4.4.3.2). These will probably govern your design if your structure is too flexible.

### RE: Minimum allowable frequency of a structure - Eurocode provision?

(OP)
Ok now i understand what you mean. My values are well below the limit. so it should be fine. Next i will need to check on the elements individually.

#### 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.

#### Resources

Research Report: State of IoT Adoption in Product Development 2019
This research report, based on a survey of 234 product development professionals, examines the current state of Internet of Things (IoT) adoption by product design teams, its perceived importance, and what features and capabilities teams consider important when making decision about adding IoT functionality to their products. Download Now
Research Report: Augmented Reality for Maintenance, Repair and Overhaul (MRO)
The term Industry 4.0 denotes a cluster of technologies thatâ€™s poised to fundamentally reshape manufacturing and bring about a new industrial revolution. These include 3D printing (AM), the Industrial Internet of Things (IIoT), artificial intelligence (AI) and mixed reality technologies, more commonly known as virtual reality (VR) and augmented reality (AR). Download Now

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:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!