Banner for LabNotes
From Lab Notes
Contact Information
Forest Products Laboratory
One Gifford Pinchot Drive
Madison, WI 53726-2398
Phone: (608) 231-9200
Fax: (608) 231-9592
Email

 

You are here: FPL Home  / Information Products & Services  / Publications

Requested Product

Title: Shaping cross-laminated timber panels to rock and roll as seismic pendulum isolators

Source: In: Proceedings, WCTE 2018-2018 World Conference on Timber Engineering. Seoul, Republic of Korea: Korean Institute of Forest Science. 10 p.

Author(s)Lo Ricco, Marco ; Ghorbanpoor, Al ; Rammer, Douglas ; Pei, Shiling

Publication Year: 2018  View PDF »

Category: Conference Proceedings

Abstract: While research of Cross-Laminated Timber (CLT) structures prioritizes force-based design for earthquake hazards, this project navigates a complementary displacement-based route—charted by United States building code provisions for seismic isolation. Curvilinear cuts to the load-bearing edges of stock CLT panels enable walls to roll through pendulum motion. Elliptical geometry provides the mechanism to lift supported storeys, passively self-centre through oscillatory damping, and avert damage to the panel corners. Wider elliptical profiles reliably negate residual displacements, as a consequence of greater eccentricity between the contact forces. Panels shaped to lesser elliptical eccentricities, however, isolate superstructures more effectively by lengthening the rocking period as much as 1.5 seconds and adding greater than a metre of lateral displacement capacity. Physical models at 1/12th scale, computer simulations, and tests of the contact behaviour between CLT panel edges and boundary materials, answer practical questions about how connections and friction profoundly alter the rocking kinematics. Full-scale prototypes of 5-Layer CLT panels—respectively measuring 2.44 by 3.66 by 0.17 metres in width, height, and thickness—compare 3 rocking versions of rolling isolation. This paper presents the strategy and initial data qualifying CLT for versatile use as soft-storey isolation within multi-storey schemes—to achieve earthquake-resilient performance.

Keywords: Cross-laminated timber; rocking wall systems; rolling seismic isolation; earthquake resiliency

Publication Review Process: Informally Refereed (Peer-Reviewed)

File size: 817 kb(s)

Date posted: 11/23/2020

This publication is also viewable on Treesearch:  view
RITS Product ID: 10067
Current FPL Scientist associated with this product
Rammer, Douglas R.
Research General Engineer
  

Additional items that might interest you
View the video celebrating FPL's 100 years of public service in 2010, from the producers of the Greatest Good....view

Research Highlights from FPL....view

Termite Eradication: A search for the Holy Grail.... view

Moisture Management in Residential Construction Series videos...view

Wood Floor Systems in Residential Construction Series videos....view
- FPL's Mission and Strategic Plan -

FPL's mission is to identify and conduct innovative wood and fiber utilization research that contributes to conservation and productivity of the forest resource, thereby sustaining forests, the economy, and quality of life. ... ..more »

- FPL Research Emphasis Areas -
Advanced Composites

As an integral part of the FPL mission, we improve the long-term sustainability of our Nation's forests by creating valuable composite products from biobased materials ... ..more »


Advanced Structures

The FPL has been in the forefront of wood-frame housing research since 1910 and has long been recognized as a world leader in such housing-related areas as engineered wood ... ..more »


Forest Biorefinery

We all know the compelling reasons that the United States needs to reduce its dependence on fossil fuels. Historically, the greatest increases in energy demand have been for transportation fuels ... ..more »


Nanotechnology

A leader in wood products research for over a century, the FPL is positioning itself to become the lead Federal research facility for the application of nanotechnology in forest products ... more »


Woody Biomass Utilization

Forests in the United States contain a substantial amount of small-diameter, overstocked, and underutilized material.FPL research projects are exploring the potential of the small-diameter ... ..more »