The basic approach for design of infrastructure components and systems utilizes a single loading scenario and a single performance criterion; usually life-safety. In recent years, social and economic considerations have necessitated that more than one performance criterion is used, and also more than one level of earthquake intensity. This multiple load-and-limit state seismic design is the current best practice. There are a few locations around the world that warrant an alternative approach. These locations are affected by more than one earthquake within a relatively short period of time due to their special seismo-tectonic setting. Currently, the response of engineering structures to multiple earthquakes that impose strong ground shaking is at a very early stage of development. There are no parameterized solutions that predict the effect of several strong earthquakes on buildings and bridges. Indeed, all papers in the published literature assume that the first earthquake will impose the maximum damage. The present analytical work deals with assessment of structures subjected to seismic sequences. In so doing, inelastic constant ductility acceleration, displacement and force reduction factor spectra are derived for a set of natural multiple earthquakes. Advanced hysteretic models with stiffness and/or strength degradation are employed to simulate the seismic response of typical non-compliant reinforced concrete (RC) structures under earthquake loading. Normalized strength ratio spectra for the selected set of records indicate that the force demand on structures may be three times that of a single event. Such demand is significantly influenced by the ductility levels, especially for periods greater than 1.0 second. Consistently higher inelastic displacements have been observed for multiple earthquakes than the case of a single event, even when the latter was the strongest record of the sequence

Assessment of structures subjected to multiple earthquakes

Di Sarno L;
2012

Abstract

The basic approach for design of infrastructure components and systems utilizes a single loading scenario and a single performance criterion; usually life-safety. In recent years, social and economic considerations have necessitated that more than one performance criterion is used, and also more than one level of earthquake intensity. This multiple load-and-limit state seismic design is the current best practice. There are a few locations around the world that warrant an alternative approach. These locations are affected by more than one earthquake within a relatively short period of time due to their special seismo-tectonic setting. Currently, the response of engineering structures to multiple earthquakes that impose strong ground shaking is at a very early stage of development. There are no parameterized solutions that predict the effect of several strong earthquakes on buildings and bridges. Indeed, all papers in the published literature assume that the first earthquake will impose the maximum damage. The present analytical work deals with assessment of structures subjected to seismic sequences. In so doing, inelastic constant ductility acceleration, displacement and force reduction factor spectra are derived for a set of natural multiple earthquakes. Advanced hysteretic models with stiffness and/or strength degradation are employed to simulate the seismic response of typical non-compliant reinforced concrete (RC) structures under earthquake loading. Normalized strength ratio spectra for the selected set of records indicate that the force demand on structures may be three times that of a single event. Such demand is significantly influenced by the ductility levels, especially for periods greater than 1.0 second. Consistently higher inelastic displacements have been observed for multiple earthquakes than the case of a single event, even when the latter was the strongest record of the sequence
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/904620
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