Nonlinear Dynamic Analysis of a Structure with a Friction-Based Seismic Base Isolati

Nonlinear Dynamic Analysis of a Structure with a Friction-Based Seismic Base Isolati - Printable Version

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Nonlinear Dynamic Analysis of a Structure with a Friction-Based Seismic Base Isolati - TAFATNEB - 04-02-2014

Nonlinear Dynamic Analysis of a Structure with a Friction-Based Seismic Base Isolation System

Earthquakes constitute a substantial form of excitation of structures in terms of their large potential to cause structural damage. Therefore, in earthquake-prone regions, the seismic resistance of structures is carefully studied during the design phase. In regions where seismicity is insigni cant,
the conventional design approach aims at the design of structural members in such a way that static (gravitational) and dynamic loads (such as wind load) are withstood elastically. However, if this design approach was to be followed in cases where seismic excitation had to be taken into account, this might lead to economically unacceptable design solutions. For example, the designmight result in very large and, hence, expensive structural members. For that reason, two alternativedesign concepts are often chosen [ECS, 2001].In the rst design concept, plastic deformation during excitation is allowed in special parts ofthe structure, often called plastic hinges, while the rest of the structure remains in its elasticrange. These plastic hinges are designed for high ductility, in order to ensure global stability of the structure [ECS, 2001]. Because the energy dissipation through plastic deformation is muchlarger than if the structure would remain elastic, the load-capacity of the structural members can
be signi cantly reduced, resulting in a more economical design.

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