Seismic resilience #1 - Performance of irregular seismic bracing in light timber-framed buildings

Abbreviation
BRANZ Research Now - Seismic resilience #1
Valid from
1/09/2020

Information provider
BRANZ Limited
Information type
Research report
Format
PDF

Description

BRANZ research has found that the current requirements for the distribution of seismic bracing elements in NZS 3604:2011 Timber-framed buildings are too lenient. Full-scale experiments and three-dimensional modelling suggest that some parts of irregular light timber-framed (LTF) buildings could be unacceptably flexible during earthquakes, with lateral deflections up to five times greater than for regular LTF buildings. This would result in Code-compliant buildings experiencing damage during earthquakes that is uneconomical to repair.

New Zealand is unique internationally in considering plasterboard wall and ceiling linings to be structural elements of timber-framed buildings. These elements are also relied on as bracing to provide resistance against movement during seismic events.

Scope

In this report:

  • International literature review on the seismic behaviour of irregular buildings
  • New Zealand standard for seismic bracing in LTF buildings
  • Modelling plasterboard wall performance
  • Rigidity study of ceiling diaphragms
  • Design of test buildings for three-dimensional seismic analyses
  • Structural modelling and seismic analyses
  • Key findings
  • Recommendations
  • Future work
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For assistance with locating previous versions, please contact the information provider.
This resource is not cited by any other resources.

Seismic resilience #1 - Performance of irregular seismic bracing in light timber-framed buildings

This document is not CITED BY any other resources:

Seismic resilience #1 - Performance of irregular seismic bracing in light timber-framed buildings

Description

BRANZ research has found that the current requirements for the distribution of seismic bracing elements in NZS 3604:2011 Timber-framed buildings are too lenient. Full-scale experiments and three-dimensional modelling suggest that some parts of irregular light timber-framed (LTF) buildings could be unacceptably flexible during earthquakes, with lateral deflections up to five times greater than for regular LTF buildings. This would result in Code-compliant buildings experiencing damage during earthquakes that is uneconomical to repair.

New Zealand is unique internationally in considering plasterboard wall and ceiling linings to be structural elements of timber-framed buildings. These elements are also relied on as bracing to provide resistance against movement during seismic events.

View on Information Provider website Download this resource (PDF, 849KB)
Seismic resilience #1 - Performance of irregular seismic bracing in light timber-framed buildings
Description

BRANZ research has found that the current requirements for the distribution of seismic bracing elements in NZS 3604:2011 Timber-framed buildings are too lenient. Full-scale experiments and three-dimensional modelling suggest that some parts of irregular light timber-framed (LTF) buildings could be unacceptably flexible during earthquakes, with lateral deflections up to five times greater than for regular LTF buildings. This would result in Code-compliant buildings experiencing damage during earthquakes that is uneconomical to repair.

New Zealand is unique internationally in considering plasterboard wall and ceiling linings to be structural elements of timber-framed buildings. These elements are also relied on as bracing to provide resistance against movement during seismic events.

View on Information Provider website Download this resource (PDF, 849KB)
This resource does not cite any other resources.

Seismic resilience #1 - Performance of irregular seismic bracing in light timber-framed buildings

This resource does not CITE any other resources.
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