PNS AStech

Response Control and Seismic Isolation Devices

We offer ingenious anti seismic technologies and products as economical, reliable and secure solutions.

In earthquake prone regions worldwide, our products have been applied to a large number of structures including buildings, bridges and other various types of infrastructure for many years.

UBB™ (Unbonded Brace)

UBB™ is a structural brace element consisting of a steel core plate which is restrained by mortar and steel tube.

A membrane called the unbonding material, between the mortar and the core plate, ensures that axial forces in the core plate do not transfer to the mortar and the steel tube.

This ingenious combination of components produces stable and symmetric tension-compression hysteretic behavior.

UBB™ Performance

Hysteresis loops in tension and compression have equal strength and stiffness, in the pre- and post-yield ranges.

1) Same stiffness in tension and compression

2) Same strength in tension and compression

3) Stable and symmetric behavior in tension and compression



Satisfaction of seismic manual issued by AISC

UBB™ has been conducted a number of loading tests which satisfy design requirement of seismic design manual issued by American Institute of Steel Construction (AISC).


UBB™s are adopted more than 800 projects in the world.

UBB™ SAMPLE APPLICATION

NAIA Terminal 1 Retrofit Project, 2014

Project Owner: NAIA
Axial force: 2500 kN
Connection: Weld and pin


Imperium Project 2017

Project Owner: Ortigas & Company Limited Partnership
Axial force: 6,000 kN and 4,500 kN
Connection: Pinned Connection
Status: Ongoing Construction

Sonata Premiere Residences Project 2017

Project Owner: Robinsons Land Corporation
Axial force: 11,000 kN
Connection: Welded
Status: Ongoing Construction



Visco-elastic Coupling Damper (VCD)

The Viscoelastic Coupling Damper (VCD) uses 3M VE material, which was first used in tall building damper application in the world in 1969. 3M dampers have since been used in over 250 projects throughout the world for both wind servicability and seismic protection.

Enhanced Wind Performance
VCDs reduce lateral accelerations, torsional velocities, drifts and design loads leading to more efficient designs and increased safety.

Enhanced Seismic Performance
VCDs reduce seismic vibrations (drifts, accelerations, and design loads) through added distributed damping and are capacity designed such that if predefined loads are reached in the system, the VCDs connecting elements act as “structural fuses”, preventing damage in adjacent structural elements and protecting the dampers against overloading

Constructability

VCD modules are installed off the critical path and are simply bolted to steel templates that are anchored into the walls during casting.

VCDs can be configured in the most commonly used structural configurations, such as between reinforced concrete core walls replacing coupling beams.

VCDs can also be connected between outriggers and exterior columns.

The VCD configuration is highly efficient for adding damping to tall buildings because it takes advantage of the large vertical deformations that are generated under lateral loading of the concrete elements.

History

VCD modules are installed off the critical path and are simply bolted to steel templates that are anchored into the walls during casting.

VCDs can be configured in the most commonly used structural configurations, such as between reinforced concrete core walls replacing coupling beams.

VCDs can also be connected between outriggers and exterior columns.

The VCD configuration is highly efficient for adding damping to tall buildings because it takes advantage of the large vertical deformations that are generated under lateral loading of the concrete elements.

Over 40,000 3M viscoelastic dampers have been implemented world-wide in over 250 buildings all the way from Asia to North America.

This includes both wind servicability and seismic protection.

Park Central Towers

Project Owner: Ayala Land Premier
Location: Makati City
Scale: 128 VE Panels
Status: Ongoing Construction

The Connor at Greenhills

Project Owner: Ortigas & Company Limited Partnership
Location: Greenhills Shopping Center
Scale: 48 VE Panels
Status: Ongoing Construction





NS-SSB™ (Spherical Sliding Bearing)

Features

1. Isolation period not affected by building weight

2. Negligible torsional response of isolated superstructure

3. Compact isolation bearing


4. Long isolated period possible with no need for other isolation bearings

5. Excellent durability


6. Easy design selection

7. Negligible variation of device properties
*Eccentricity may occur when medium- and low-friction types are combined.



Pendulum principle

Virtually no mass stiffness eccentricity*

Using steel as the main material,approximately three times the bearing stress of
laminated rubber bearing (60 N/mm2) is possible

Natural period (tangential period) defined by radiusofcurvature

Confirmed cumulative sliding distance of about 120m (for both
medium/low friction)

Can separately select support weight and required displacement

Excellent manufacturing accuracy



Configuration


NS-SSB™ Projects




NS-U™ (U-shaped Steel Damper)

Examples of NS-U™ Applications