We have a dedicated site for Germany. It has since then started penetrating codes and standards on seismic assessment and retrofitting and making headway towards seismic design standards for new structures as well.
Two Workshops on Performance-based Earthquake Engineering , held in Bled Slovenia in and are considered as milestones. It covers the entire scope of Performance-based Earthquake Engineering : Ground motions for performance-based earthquake engineering; Methodologies for Performance-based seismic design and retrofitting; Implementation of Performance-based seismic design and retrofitting; and Advanced seismic testing for performance-based earthquake engineering.
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One alternative that is often accepted by building officials is the use of a Performance Based Seismic Design. Performance Based Seismic Design PBSD is a design concept that is currently being applied in seismic design on a variety of buildings and bridges.
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Its main goal is to produce structures that will have predictable results in the event of an earthquake. A defining parameter in PBSD is its performance objective : the acceptable level of damage selected for a specified earthquake intensity level. A building may be designed based on one or multiple performance objectives.
For example: a residential building could be designed for two performance objectives: 1 to be fully operational no damage, continuous service based on an earthquake of low intensity and high probability of occurrence and, 2 to achieve collapse prevention extensive damage while not endangering the lives of its occupants for a severe but low probability earthquake event. Given that PBSD intends to achieve specific performance objectives, it is necessary for the design to be based on reliable predictions of earthquake shaking and building behavior.
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Therefore, implementing PBSD requires the following:. The importance and inherent value in PBSD is in its refined predictions of earthquake demands and building response.
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Design engineers can produce more cost-efficient seismic designs by avoiding conservatism found in prescriptive code-based designs. The building owner can potentially use the PBSD data to quantify the repair costs to the building for each earthquake intensity and make informed decisions about their investment. The application of PBSD in engineering projects has become possible due to the advances in knowledge of earthquake engineering as well as in computing technology.
With science and technology continuing to make great progress, it is likely that PBSD and the use of predictable performance objectives will become a more prevalent part in seismic design. Jose Centeno, Ph.
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