Contact US

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!

*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

Ductility requirements for masonry anchors in high seismic areas

Ductility requirements for masonry anchors in high seismic areas

Ductility requirements for masonry anchors in high seismic areas

Are there any code provision that require ductile failure modes for cast-in anchors in CMU in high seismic areas? For example with concrete, ACI appendix D clearly outlines the requirement that ductile failure modes must govern anchorage design in SDC C or higher structures or that you can alternatively increase the loads with the overstrength factor. Are there any such code provisions for applying overstrength factors in the design of anchors in CMU for SDC C or higher structures?

Section of ASCE 7-05 states to add the following to section 3.1.6 of ACI 530/TMS 402: Anchorage assemblies connecting masonry elements that are part of the seismic force-resisting system to diaphragms and chords shall be designed so that the strength of the anchor is governed by steel tensile or shear yielding. Alternatively, the anchorage assembly is permitted to be designed so that it is governed by masonry breakout or anchor pullout provided that the anchorage assembly is designed to resist not less than 2.5 times the factored forced transmitted by the assembly.

I'm confused by this section because section 1613 of IBC 2006 excludes chapter 14 of ASCE 7-05.

RE: Ductility requirements for masonry anchors in high seismic areas

I will suggest you to look ASCE 7-16 and provide more info. regarding your specific case .
Copy and paste of relevant clause for Non bld structures; Anchors in Masonry.

Anchors in masonry used for nonbuilding structure anchorage shall be designed in accordance with TMS 402. Anchors shall be designed to be governed by the tensile or shear strength of a ductile steel element.
EXCEPTION: Anchors shall be permitted to be designed so that either:

a. the attachment that the anchor is connecting to the structure undergoes ductile yielding at a load level corresponding to
anchor forces not greater than the design strength of the anchor, or

b. the anchors shall be designed to resist the load combinations in accordance with Section 12.4.3 including Ω0 as
given in Tables 15.4-1 and 15.4-2.

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


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. 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