×
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

LONG TERM DEFLECTION

LONG TERM DEFLECTION

LONG TERM DEFLECTION

(OP)
DEAR ALL :
HOW TO CALCULATE SLAB LONG TERM DEFLECTION BY SAFE ?
SND WHAT IS THE ALLOWABLE LONG TERM DEFLECTION VALUES?

RE: LONG TERM DEFLECTION

go in to load cases and add a new case, by choosing long term with cracking on the right. specify the shrinkage and creep coefficients. How accurate safe computes this, I dont know.

As for allowable deflections, there is no hard set rule here. Depends on the sensitivity of the structure to deflections. For instance if there is brittle masonry being supported by the slab then deflections must be tighter than if it was say a stud wall over

RE: LONG TERM DEFLECTION

go to the CSI FAQ (frequently asked questions). you can easily find the way to calculate the long term deflections for slabs.

RE: LONG TERM DEFLECTION

Dear Colleagues This is to share with you my findings regarding this issue:In order to find the long term deflection according to ACI318-08 considering the Creep and Shrinkage effects  the following tips have to be followed using the SAFE v12:  1-    Define Load Patterns for Dead Load (DL), Super Imposed Dead Load (SIDL) and Live Load (LL).  2-    Define Load Cases as following:   i)    Case 1, to be Load Case type: Static, to be initial conditions: Zero Initial Conditions, to be Analysis Type: Nonlinear (Cracked), to be Loads Applied: DL (1) and SIDL (1).   ii)    Case 2, to be Load Case type: Static, to be initial conditions: Zero Initial Conditions, to be Analysis Type: Nonlinear (Cracked), to be Loads Applied: DL (1), SIDL (1) and LL (1).   iii)    Case 3, to be Load Case type: Static, to be initial conditions: Zero Initial Conditions, to be Analysis Type: Nonlinear (Long Term Cracked), to be Loads Applied: DL (1), SIDL (1) and LL (0.25), for example.According to the ACI318-08 (R9.5.2.5) and reference to ACI Committee 435 (2.3.5) ,It is Recommended to use Creep Coefficient as 1.60 and Shrinkage Strain 0.0004.  3-    Define Load Combination (Long Term) Case 3 (+1.0), Case 2 (+1.0) and Case 1 (-1.0).I am looking for your helpful feedback in order to use the right method.

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! Already a Member? Login


Resources

eBook - Integrating the Engineering Ecosystem
Aras Innovator provides multiple options for integrating data between systems, depending on the scenario. Utilizing the right approach to meet specific business requirements is vital. These needs range from authoring tools, federating data from various and dissimilar databases, and triggering processes and workflows. Download Now
Research Report - Simulation-Driven Design for SOLIDWORKS Users
In this engineering.com research report, we discuss the rising role of simulation and the paradigm shift commonly called the democratization of simulation. In particular, we focus on how SOLIDWORKS users can take advantage of simulation-driven design through two analysis tools: SOLIDWORKS Simulation and 3DEXPERIENCE WORKS. Download Now
White Paper - Industry 4.0 and the Future of Engineering Education
With industries becoming more automated, more tech-driven and more complex, engineers need to keep their skills and knowledge up to date in order to stay on top of this wave—and to be prepared for the Industry 4.0 future. The University of Cincinnati offers two online Master of Engineering degree programs designed specifically for practicing engineers. Download Now
eBook - The Design Gridlock Manifesto
In this eBook, you’ll learn 6 ways old CAD technology slows your company down and hear how design teams have put those problems to rest. “The Design Gridlock Manifesto” shares first-hand modern CAD experiences from 15 companies around the world. 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:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close