Vibration Control and Seismic Isolation Devices
We offer ingenious anti-seismic products and technologies that deliver economic, reliable, and performative solutions in earthquake-prone regions.
Our products have been applied to a large number of structures throughout the world including bridges and other infrastructure.
NS-UBB™ (Unbonded Brace)
NS-UBBs™ are buckling-restrained braces consisting of steel core plates encased in mortar-filled steel-tube restrainers.
A membrane called the unbonding material separates the core and restrainer, preventing axial forces from being transmitted while laterally restraining the core plate. This ingenious design produces a stable and symmetric hysteresis, dissipating energy through highly-efficient axial yielding of the steel core, while displaying essentially no externally-visible damage.
NS-UBBs™ are regularly tested through sequential protocols of greater-than-design-level earthquakes, and were proven in real-lire during the M9.0 2011 Great East Japan Earthquake.
NS-UBB™ Performance
Hysteresis loops have nearly symmetric strength and stiffness in both the pre- and post-yield ranges.
1) Identical elastic stiffness and yield strength in tension and compression
2) Nearly-identical post-yield strength and stiffness in tension and compression
3) Stable and symmetric behavior in tension and compression
Satisfies both the Japanese and American (AISC) standards
NS-UBB™ has conducted a number of loading tests that satisfy the American Instititue of Steel Construction (AISC) specifications.
NS-UBBs™ are the most rigorously qualified buckling-restrained braces in the world, having been extensively tested to the American Institute of Steel Construction’s AISC 341 standard and pre-qualified in Japan.
NS-UBB™s have been applied in more than 2,200 projects around the world.
Completed Projects in the Philippines
NAIA Terminal 1 Retrofit Project, 2014
Project Owner: NAIA
Axial yield force: 2,500kN
Connection: Weld and pin
Imperium Project 2017
Project Owner: Ortigas Land, Inc.
Axial yield force: 4,500 to 6,000kN
Connection: Pinned Connection
Sonata Premiere Residences Project 2017
Project Owner: Robinsons Land Corporation
Axial yield force: 11,000kN
Connection: Welded
Other NS-UBB Sample Projects all over the world
OTHER NS-UBB™ SAMPLE APPLICATIONS
NS Steel Panel™
NS Steel Panel™ is composed of all steel materials. Steel Panel is stiffened by steel tubes to prevent overall buckling. During earthquakes, stable performance is achieved through overall yielding.
Features
1) High Performance of Seismic Damping
- Stable hysteresis loops are shown on tests
- High energy absorption
- High resistance to cyclic loading
2) Simple Construction
- Easy on-site installation similar to ordinary steel member
Benefits of Application of NS Steel Panel™
1) Low maintenance
- Uses steel only
2) Reasonable Price
- Compared to other devices, NS Steel Panel™ is economic due to its simple composition
- The application of NS Steel Panel™ can reduce concrete and rebar volume
3) Flexibility of Allocation
- Compact shape does not interfere with floor plan
- Easily accommodates openings
4) Asset Value
- Enhances the building asset value by applying a seismic protective device
5) Multi-Purpose Usage
- Not only for new building but also for retrofitting
Configuration of NS Steel Panel™
NS Steel Panel™ Sample Projects
Other Vibration Control Devices Projects in the Philippines
Parklinks North and South Towers by Ayala Land Premier
Project Owner: ALI ETON PROPERTY DEVELOPMENT CORPORATION
Location: Libis, Quezon City
Scale: 96 devices
Park Central Towers
Project Owner: Ayala Land Premier
Location: Makati City
Scale: 128 devices
The Connor at Greenhills
Project Owner: Ortigas Land, Inc.
Location: Greenhills Shopping Center
Scale: 48 devices
The Seasons Residences
Project Owner: Federal Land, Inc.,
Nomura Real Estate and Isetan Mitsukoshi Holdings
Location: 8th Avenue Veritown
Fort Bonifacio Global City
Scale: 232 devices
NS-SSB™ (Spherical Sliding Bearing)
Features
1) Pendulum principle ---------------------------------------------------------------------------->
2) Virtually no mass/ stiffness eccentricity* ------------------------------------------------>
3) By using steel, the bearing stress is approximately tripled ------------------------>
compared to laminated rubber bearings
4) Natural period (post-slip tangent period) is defined by the --------------------->
bearing’s radius of curvature
5) Experimentally-verified cumulative sliding distance of about 120m --------->
(for both the medium and low friction types)
6) Offers designers flexibility, with the vertical load-bearing and ----------------->
horizontal displacement capacity selected separately
7) Excellent manufacturing accuracy ------------------------------------------------------>
*Eccentricity may occur when medium- and low-friction types are combined.
Isolation period is independent of the building weight
Negligible torsional response of the isolated superstructure
Compact isolation bearing
Long isolated period possible with no need for other
isolation bearings nor dampers
Excellent durability
Easy design selection
Negligible variation of device properties
Configuration
Allocation
Installation Image
Performance Image
NS-SSB™ Projects
NS-U™ (U-shaped Steel Damper)
Dynamic loading test simulating a design-level earthquake
Examples of NS-U™ Applications
