new strategies in anti- seismic protection … am2 - new... · new strategies in anti-seismic...
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NEW STRATEGIES IN ANTI-SEISMIC PROTECTION
Adrian Dogariu
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards
and Catastrophic Events520121-1-2011-1-CZ-ERA MUNDUS-EMMC
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NEW STRATEGIES IN ANTI-SEISMIC PROTECTION
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NEW STRATEGIES IN ANTI-SEISMIC PROTECTION
• Seismic isolation systems can be divided into :
• Period elongation systems (PE) – the reduction of the seismic forces is mainly done by means of horizontal flexible elastic supports.
• Force barrier systems (FB) have a plastic rigid behavior or even elastic nonlinear with zero or very low consolidation. The systems are characterized by a well defined step force which prevents the transmission of forces greater than it to the superstructure.
• Period elongation / Energy dissipation systems (PE/ED)
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REDUCTION DEVICES
GROUND MOVES
STRUCTURE STAYS STILL
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SLIDING OR FRICTION ISOLATORS
• This type of systems has a simple setup based on a clear and easy-to-use concept.
• One layer with a certain friction coefficient will limit the acceleration and the forces transmitted into the system (building) at a prescribed value, equal to the ratio of the friction coefficient and the weight of the building.
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ELASTOMERIC SUPPORTS
• These devices are made of multiple layers from thin natural or artificial rubber tied together by metal plates
• The metal plates prevent the excessive deformation of the device under vertical loads which can lead to stability loss for these elements.
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SPRINGS
• They are specific devices based on metallic
• This family of devices is not widely used and they are generally used for the isolation of mechanical machines.
• The main disadvantage of this type of isolators is the increased flexibility, horizontal and vertical.
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DISSIPATING DEVICES
• Viscous dissipaters (oil dissipaters) – these devices offer a good damping but they do not have any resistance to service loads.
• They do not have elastic rigidity and therefore they introduce into system only a small amount of energy;
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DISSIPATING DEVICES
• Devices based on steel yielding – set in such a way as to yield to various types of efforts, as bending, torsion, etc. They offer rigidity as well as a good damping and dissipation
• Devices based on lead yielding act to shear and offer rigidity and damping.
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Isolators
Laminated Rubber Bearings
Natural Rubber Bearings
Lead Rubber Bearings
High-Damping Rubber Bearings
Slide Bearings Elastic Slide Bearings
Rigid Slide Bearings
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