Seismic Mitigation - Hardware & Software
Services provided by Holmes in the field of isolation and energy
dissipation include Seismic Mitigation Software and Hardware:
·
Base isolators
· Dampers
· Performance based analysis
Go to our
Download Design Guide page for
full design guidelines.
Engineering
Services for Isolation and Energy Dissipation
Holmes
can provide a full range of engineering services to implement
both isolation and energy dissipation strategies, from initial
feasibility studies to full design, analysis and documentation.
The company
has developed design and analysis software to ensure effective
and economical implementation of seismic isolation for buildings,
bridges and industrial equipment. Expertise encompasses the areas
of isolation system design, analysis, specifications and performance
evaluation .
System
Design
·
Special purpose spreadsheets and design programs
· British Standards (BS 5400)
· Uniform Building Code (UBC)
· U.S. Bridge Design (AASHTO)
Analysis
Software
·
ETABS Linear and non-linear analysis of buildings
· SAP2000 General purpose linear and non-linear analysis
· DRAIN-2D Two dimensional non-linear analysis
· 3D-BASIS Analysis of base isolated buildings
· ANSR-II Three dimensional non-linear analysis
Specifications
·
Codes
· Materials
· Fabrication
· Tolerances
· Material Tests
· Prototype Tests
· Quality Control Tests
Evaluation
·
Isolation system stiffness
· Isolation system damping
· Effect of variations on performance
We can provide
an independent engineering service to select the optimum devices
for your particular projects. Download a copy of our Base Isolation
Design Guidelines or Damper Design Guidelines for a full description
of our capabilities.
Support
for Base Isolation and Damper Hardware Manufacturers
In addition
to our independent design services, Holmes provide device-specific
technical services to the two New Zealand manufacturers of seismic
mitigation hardware and also an Australian and US manufacturer
of specific devices:
1. Skellerup
Industries Ltd - Lead rubber bearings, high damping rubber
bearings.
2. Robinson
Seismic Ltd - Lead rubber bearings, lead extrusion dampers,
rolling isolators, lead shear dampers.
3. Ludowici
Bearings, Ltd - flat sliding bearings, pot bearings.
4. Fyfe
Co LLC - visco elastic dampers, yielding steel brace dampers.
From these
sources we can assemble the hardware for a competitive isolation
or energy dissipation system for most seismic mitigation projects.
If you have
a project suitable for these mitigation techniques, we can provide
a no cost feasibility assessment. If you wish to take advantage
of this, contact us and we will let you know the information we
require. It will usually consist of vertical and seismic loads.
Performance
Based Design
Isolation and energy dissipation seismic mitigation techniques
by their nature require a performance based assessment of earthquake
performance. Holmes has developed non-linear analysis software
for such assessments. The software is based on the ANSR-II and
ANSR-III computer programs, developed at the University of California,
Berkeley.
All input
for the program is prepared on an Excel spreadsheet with macros
to assemble the input files for the ANSR program. Results are
processed and imported into an output Excel spreadsheet. This
allows engineers to prepare data, and assess results, using familiar
spreadsheet tools.
Because non-linear
analysis is such a complex process, we neither sell the software
nor provide support resources for a large user base. However,
we can provide partnering if you have a project which requires
these tools. We can supply you the spreadsheet to prepare data,
we will tune and debug the model, run the analyses, evaluate the
results and send you the output spreadsheets.
Base isolated
and damped structures require the dynamic time history method
of analysis (NDP) The software is also capable of non-linear pushover
analysis (NSP) for conventional structures and other forms of
seismic strengthening, such as fiber reinforced polymers (composites).
Performance
Based Design : Project List
Example
Project : Greenlane Hospital, Auckland
Example
Project : The Gateway, Salt Lake City, UT
Example
Project : The Beehive, Wellington
Base
Isolation : Project List
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