Pioneer in the development of earthquake protection devices, Freyssinet offers a complete range of dedicated products and associated services marketed under the well-known ISOSISM® brand.

  • Applications
    Bridges
    Stadiums
    Water infrastructures
    Energy infrastructures
    Viaducts
Benefits

Why choose ISOSISM® systems

01. Wide range of applications

New structures, retrofitting of existing structures, post-earthquake repair. Bridges and viaducts, industrial and energy facilities, heritage buildings, hospitals and schools.

02. Wide range of solutions

Based on four concepts, used alone or combined together: Isolation - Dissipation by damping - Connection - Junction

03. Cost savings

On average, initial savings of 15% on the project overall cost. Continued operations after an earthquake and lower rebuilding costs.

04. Environment-friendly

Earthquake protection devices allow to considerably lighten the superstructure and the foundations of a structure.

05. Low maintenance

Easy installation & replacement, low maintenance.

06. Approved systems

Conformity to all international standards, CE marking on request.

07. Tailored solutions

Not only products. But solutions tailored to the seismic risk, the structure, its environment and your economic constraints.

08. Full service

From risk and structure analysis to installation of seismic solutions and maintenance.

ISOSIM at a glance

A double expertise upstream

ISOSISM device

Our technical teams will assist you to:

  1. Analyse the seismic behaviour of your structure
  2. Select the appropriate protection solution

We make this dual expertise available to structural designers and clients, providing them with practical solutions to optimize the overall cost of the structure and minimise the seismic risks of their infrastructure project.

ISOSISM®: an all-inclusive offer

From risk assessment to installation... and maintenance

and maintenance

Download ISOSISM brochure

Documentation

Find out more in our case studies

ISOSISM® Damping systems

ISOSISM® damping systems allow to dissipate part of the energy generated by an earthquake so as to minimize its impact on the structures.

They are particularly effective under quick stresses (earthquakes, boat impacts, etc) and offer very low resistance to slow movements under service conditions.

They can be used in combination with an isolation system, especially High Damping Rubber Bearings, to reduce structural displacement while limiting the stresses to which structures are subjected.

  • 100+
    Number of projects worldwide
  • 1,000+
    Number of units installed worldwide

Benefits

01. Preservation of the structure integrity

Reduction of earthquake effects on the structure, by absorption of the energy. They also enable critical buildings, such as hospitals, to continue operating.

02. Continuity of activity

For critical buildings, such as hospitals.

03. Seismic retrofitting

Effective protection for structures that were not originally designed to withstand seismic activity.

04. Cost savings

Reduced civil engineering costs at construction stage, and maintenance and repair costs throughout the life cycle

05. Maintenance free

Limited to periodic visual inspection throughout the design life

06. Versatility

New constructions or retrofit purposes.

07. Certified products

Compliant with all international standards, CE marking on request.

08. Taylor made

Optimized design to project specifications

ISOSISM® FD (Fluid Damper)

The ISOSISM® FD is a hydraulic damper using a viscous fluid that is stable under temperature variations and over time. It is made up of a body with two chambers separated by a piston. The damper operates in both tension and compression.

The damping is provided by the viscous fluid flowing through the piston, which is equipped with specially designed valves.

The system can be used in addition to isolators for bridges and buildings, and bracing in buildings.

Applications: bridges, buildings, energy infrastructures, water infrastructures, stadiums.
  • Allows free movement of the structure
    under normal service conditions
  • Dissipates energy during an earthquake
  • Can be designed as a fixed point in service

ISOSISM® PDS (Prestressing Damping Spring)

The ISOSISM® PDS combines the benefits of a viscous fluid damper and a prestressed hydraulic spring. It offers three major functions in a single,compact device:
    In normal operating conditions, the system acts as fixed point. In the event of an earthquake, the device is automatically tensioned and dissipates the energy. After the earthquake, it returns the structure to its original position.

    Applications: bridges, buildings, energy infrastructures, water infrastructures, stadiums.
  • Prevents movement in normal operating conditions (fixed point).
  • Dissipates energy during an earthquake
  • Recentering capability

ISOSISM® DDD (Displacement Dependent Device)

The ISOSISM® DDD is a metallic yielding damper, whose performance is given by its shape and material. It prevents movements in normal operating conditions. During earthquakes, it deforms to absorb the energy of the earthquake and must be replaced thereafter. It is often combined with a pot bearing -as shown on the picture- and a Shock Transmitter Unit.

Applications: bridges, buildings, energy infrastructures, water infrastructures, stadiums.
  • Prevents movement in service conditions (fixed point)

    Coupled with the STU, it provides a low reaction

    to slow movements
  • Absorbs energy during an earthquake
  • Very stable cyclic behavior

Download technical datasheets and CE Certificates

Documentation

ISOSISM® isolation systems

ISOSISM® isolation systems increase the fundamental period of vibration of the structure to be protected. They reduce the response to seismic acceleration, which is reduced by a factor of two to three.

The structure isolated from the movement of the ground using ISOSISM® isolation systems increases its fundamental period of vibration and reduces the response to seismic acceleration.

The effectiveness of the isolators is directly related to the horizontal stiffness and results in a significant displacement of the structure under seismic conditions. The effects of structural isolation therefore result in a low natural frequency, low acceleration, reduced horizontal forces in the structure and increased relative displacement.

  • 1,000+
    Number of projects worldwide
  • 25,000+
    Number of units installed worldwide

Benefits

01. Prevention of structural damage

No damage to the structure which remains in the elastic response triggered by high intensity earthquakes without disrupting the structural function.

02. Simplified overall design

Ability to reduce seismic energy from the ground into the structure, which simplifies the structural design.

03. Versatility

New construction or retrofit purposes

04. Maintenance free

Limited to periodic visual inspection throughout the design life

05. Taylor made

Optimized design to project specifications

06. Certified products

Compliance with all international standards, CE marking on request

07. Cost savings

The overall cost of construction and/or maintenance and/or repair is significantly reduced. Structures remain operational after an earthquake, limiting operational losses and reconstruction costs.

ISOSISM® HDRB (High Damping Rubber Bearing)

The ISOSISM® HDRB isolator is made of alternating layers of natural rubber and steel reinforcement plates bonded by vulcanizing. It provides the appropriate level of horizontal stiffness to the structure and can dissipate energy thanks to specific high damping rubber compounds. It is available in rectangular and circular shape.

Applications: bridges, buildings, energy infrastructures, water infrastructures, stadiums.
  • Low stiffness under seismic excitations

    High stiffness under service loads (wind, braking, …)
  • Moderate maximum displacement in seismic event

    High recentering capability
  • Moderate damping capacity, from 10 to 15%

ISOSISM® LRB (Lead Rubber Bearing)

The ISOSISM® LRB isolator is made of alternating layers of natural rubber and steel reinforcement plates bonded by vulcanizing. It has one or more cylindrical lead cores. It provides the appropriate level of horizontal rigidity to the structure and can dissipate energy up to 30% damping thanks to the highly damping capacity of the lead core. It is available in square, rectangular and circular formats for optimal space saving.

Applications: bridges, buildings, energy infrastructures, water infrastructures, stadiums.
  • High damping capacity, up to 30%
  • Small deformations under service loads
  • Moderate maximum displacement in seismic event

    High recentering capacity

ISOSISM® PS (Pendulum System)

The ISOSISM® PS isolator is based on the application of a special sliding material (ISOGLIDE®), which has controlled friction and an outstanding resistance to wear and high temperatures. It has a curved sliding surface. These properties make it particularly effective as a friction-based energy dissipation element. The isolator can also be provided with a greased sliding material to reduce friction.

Applications: bridges, buildings, energy infrastructures, water infrastructures, stadiums.
  • High damping capacity, up to 35%
  • High relative displacement in seismic events
  • Particularly suitable for asymmetrical buildings

ISOSISM® FS (Flat Slider)

The ISOSISM® FS isolator is based on the application of a special sliding material (ISOGLIDE®), which has controlled friction and an outstanding resistance to wear and high temperatures. It has a flat sliding surface. These properties make it particularly effective as a friction-based energy dissipation element. The isolator can also be provided with a greased sliding material to reduce friction.

Applications: bridges, buildings, energy infrastructures.
  • High damping capacity, up to 35%
  • No horizontal stiffness
  • High relative displacement in seismic event

Download technical datasheets and CE Certificates

Documentation

Find out more in our case studies

ISOSISM® Connection system

ISOSISM® Shock Transmission Unit (STU) is used to connect buildings together, or to create a fixed point on a civil engineering structure in the event of an earthquake, emergency braking by a high-speed train or gale.

ISOSISM® connectors create a rigid connection between the superstructure and the supporting structures during quick displacements typical of seismic events and allow free movement in normal operating conditions.

ISOSISM connection system STU

  • 200+
    Number of projects worldwide
  • 2,000+
    Number of units installed worldwide

Benefits

01. Effective behavior under earthquake

The ISOSISM® STU act as rigid connection, distributing horizontal forces to the supports on which it is installed. The device works like a high-pressure hydraulic jack, correlating to the velocity of the load application.

02. No disturbance under normal operating conditions

Very low resistance to slow displacements that occur in service conditions (temperature variations, shrinkage, creep, etc)

03. Cost-savings

Reduced civil engineering costs at construction stage and for maintenance and repair throughout the life cycle.

04. Durability

Corrosion protection system, in accordance with EN 12944-2. The external compensation chamber allows thermal expansion of the hydraulic fluid to avoid overpressure and leakages.

ISOSISM® Shock Transmission Unit specifications

Documentation
Usage
Adapted to all types of structures, new or existing ones
Reaction force
500 to 4000 kN depending on model.
Lower or higher value possible for special applications
Stroke
100 to 200 mm depending on model.
Lower or higher value possible for special applications
Range
Optimized design to project specifications
Certification
Compliant with all international standards,
CE marking on request
Installation
Different installation configurations depending on the space available
Documentation

ISOSISM® SFX joint

The ISOSISM® SFX joint is a supported mat joint in which movement imposed by the main structure is absorbed by deformation of the elastomeric sections. It comprises moulded elastomeric elements, vulcanized and bonded to metal inserts designed to accommodate rolling loads and distribute loads in the fasteners.

SFX Movement of SFX joint in longitudinal (above) and transversal (below)

Movement of SFX joint in longitudinal (above) and transversal (below)

Benefits

01. High displacement capacity

Movements in any direction up to ±160 mm in service
Up to ±1000 mm in case of earthquake

02. Traffic allowed after seismic event

It returns to its initial position after an earthquake and retains its trafficability

03. Durability

Wear resistance of the rubber

04. Adapted for all type of bridges

Suited for use on skewed structures.

05. Easy installation

Can be installed directly without recesses in the main structure.

06. User comfort

The elastomer contact enables absorption of wheel impact and running surface irregularities.

07. High relative displacement

Movements in any direction up to ±160 mm in service, up to ±1000 mm in case of earthquake

Download the technical datasheet

Documentation

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