The Experts below are selected from a list of 2220 Experts worldwide ranked by ideXlab platform
Gaetano Manfredi - One of the best experts on this subject based on the ideXlab platform.
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Numerical model for the in-plane seismic capacity evaluation of tall plasterboard internal partitions
Thin-Walled Structures, 2018Co-Authors: Crescenzo Petrone, Gennaro Magliulo, Orsola Coppola, Pauline Lopez, Gaetano ManfrediAbstract:Abstract A finite element model capable to capture the Interstory Drift which causes the failure of a 5 m high plasterboard partition with steel studs is defined by employing the Direct Strength Method (DSM) to assess the occurrence of different buckling failure modes. The model is validated comparing the numerical behavior with the experimental evidence of a quasi-static test campaign on a plasterboard partition. It is concluded that the model well catches the Interstory Drifts which cause either the local or the global buckling in the partition. This conclusion is also confirmed by the strain trend in the steel studs.
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shake table tests on standard and innovative temporary partition walls
Earthquake Engineering & Structural Dynamics, 2017Co-Authors: Crescenzo Petrone, Gennaro Magliulo, Gaetano ManfrediAbstract:Summary Shake table tests are performed on temporary internal partitions for office buildings. Four different specimens are tested. A steel frame is designed to exhibit relative displacements which typically occur at a given story of ordinary buildings. Four different partition walls are tested simultaneously for each specimen typology. This allows investigating the influence of an innovative device on the seismic performance of the tested components. The innovative device avoids the unhooking of the panels from the supporting studs. Several shake table tests are performed subjecting the specimens to Interstory Drift ratios up to 1.57%. Both the hysteretic curves and the natural frequency trend highlight that the partitions do not contribute to the lateral stiffness of the test setup. The damping ratio increases after the partition walls are installed within the test frame, causing a beneficial effect in the dynamic response. Minor damage state occurs for Interstory Drift ratio (IDR) in the range 0.41–0.65% in standard specimens, whereas moderate and major damage states are attained for IDR in the range 0.51–0.95%. Significant increase of collapse IDR is recorded with the introduction of the innovative device, up to IDR larger than 1.45%. It can be therefore concluded that a simple innovative device is defined, which significantly improves the seismic performance of the tested specimen. Copyright © 2017 John Wiley & Sons, Ltd.
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Shake Table Tests for the Seismic Assessment of Hollow Brick Internal Partitions
Structures Congress 2014, 2014Co-Authors: Crescenzo Petrone, Gennaro Magliulo, Gaetano ManfrediAbstract:Bidirectional shake table tests are performed on standard hollow brick partitions, subjecting the partitions simultaneously to Interstory relative displacements in their own plane and accelerations in the out-of-plane direction. Five couples of accelerograms are selected matching the target response spectrum provided by the U.S. code for nonstructural components (i.e., AC156) in order to investigate a wide range of seismic demand. Three damage states are considered and correlated to an engineering demand parameter, i.e. the Interstory Drift ratio. The tested specimen exhibits significant damage for 0.3% Interstory Drift and extensive damage for displacement close to 1.0%. The correlation between the dynamic characteristics of the test setup - in terms of damping ratio and natural frequency - and the recorded damage is evidenced.
Crescenzo Petrone - One of the best experts on this subject based on the ideXlab platform.
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Numerical model for the in-plane seismic capacity evaluation of tall plasterboard internal partitions
Thin-Walled Structures, 2018Co-Authors: Crescenzo Petrone, Gennaro Magliulo, Orsola Coppola, Pauline Lopez, Gaetano ManfrediAbstract:Abstract A finite element model capable to capture the Interstory Drift which causes the failure of a 5 m high plasterboard partition with steel studs is defined by employing the Direct Strength Method (DSM) to assess the occurrence of different buckling failure modes. The model is validated comparing the numerical behavior with the experimental evidence of a quasi-static test campaign on a plasterboard partition. It is concluded that the model well catches the Interstory Drifts which cause either the local or the global buckling in the partition. This conclusion is also confirmed by the strain trend in the steel studs.
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shake table tests on standard and innovative temporary partition walls
Earthquake Engineering & Structural Dynamics, 2017Co-Authors: Crescenzo Petrone, Gennaro Magliulo, Gaetano ManfrediAbstract:Summary Shake table tests are performed on temporary internal partitions for office buildings. Four different specimens are tested. A steel frame is designed to exhibit relative displacements which typically occur at a given story of ordinary buildings. Four different partition walls are tested simultaneously for each specimen typology. This allows investigating the influence of an innovative device on the seismic performance of the tested components. The innovative device avoids the unhooking of the panels from the supporting studs. Several shake table tests are performed subjecting the specimens to Interstory Drift ratios up to 1.57%. Both the hysteretic curves and the natural frequency trend highlight that the partitions do not contribute to the lateral stiffness of the test setup. The damping ratio increases after the partition walls are installed within the test frame, causing a beneficial effect in the dynamic response. Minor damage state occurs for Interstory Drift ratio (IDR) in the range 0.41–0.65% in standard specimens, whereas moderate and major damage states are attained for IDR in the range 0.51–0.95%. Significant increase of collapse IDR is recorded with the introduction of the innovative device, up to IDR larger than 1.45%. It can be therefore concluded that a simple innovative device is defined, which significantly improves the seismic performance of the tested specimen. Copyright © 2017 John Wiley & Sons, Ltd.
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Shake Table Tests for the Seismic Assessment of Hollow Brick Internal Partitions
Structures Congress 2014, 2014Co-Authors: Crescenzo Petrone, Gennaro Magliulo, Gaetano ManfrediAbstract:Bidirectional shake table tests are performed on standard hollow brick partitions, subjecting the partitions simultaneously to Interstory relative displacements in their own plane and accelerations in the out-of-plane direction. Five couples of accelerograms are selected matching the target response spectrum provided by the U.S. code for nonstructural components (i.e., AC156) in order to investigate a wide range of seismic demand. Three damage states are considered and correlated to an engineering demand parameter, i.e. the Interstory Drift ratio. The tested specimen exhibits significant damage for 0.3% Interstory Drift and extensive damage for displacement close to 1.0%. The correlation between the dynamic characteristics of the test setup - in terms of damping ratio and natural frequency - and the recorded damage is evidenced.
Eduardo Miranda - One of the best experts on this subject based on the ideXlab platform.
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Assessment of building behavior under near-fault pulse-like ground motions through simplified models
Soil Dynamics and Earthquake Engineering, 2015Co-Authors: Andres Alonso-rodriguez, Eduardo MirandaAbstract:Abstract Interstory Drift and floor acceleration demands in buildings subjected to near-fault pulse-like ground motions are investigated by means of simplified building and ground motion models. A pulse model proposed by Mavroeidis and Papageorgiou is used to represent near-fault ground motions. Similarly, a continuous model formed by a flexural beam laterally coupled to a shear beam is used as a simplified model of multi-story buildings. Firstly, closed-form solutions for the response of damped single-degree-of-freedom systems subjected to Mavroeidis Papageorgiou (MP) pulses are derived and employed to construct closed-form solutions for the response of the simplified continuous model. This allows the analysis of elastic and near elastic response of buildings, which is important for the assessment of financial losses on non-structural elements. Peak responses of the continuous systems subjected to MP pulses are compared to those of the continuous systems subjected to recorded near-fault pulse-like ground motions. It is found that the proposed closed-form solutions produce very good estimates of peak Interstory Drift demands as well as their variation along building height. Acceleration demands are found to be more sensitive to the high frequency content of the ground motion, therefore, the results are not as good, but still MP pulses are able to capture the main features of the response when a sufficient number of modes is considered. After several parametric studies it was found that pulse duration is the most critical parameter influencing floor acceleration and Interstory Drift demands, when near-fault pulse like ground motion occurs; as it can induce large variations on peak and along height acceleration and Drift responses.
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fragility assessment of reduced beam section moment connections
Journal of Structural Engineering-asce, 2010Co-Authors: Dimitrios Lignos, Dimitrios Kolios, Eduardo MirandaAbstract:This paper presents fragility functions to estimate the probability of reaching or exceeding different damage states in reduced beam section (RBS) beam-to-column moment connections of steel moment resisting frames. The fragility functions are developed using results from 71 experimental tests that have been conducted on RBS connections during the past 14 years. The main sources of uncertainty considered are specimen-to-specimen variability of the Interstory Drifts associated with the various damage states and the epistemic uncertainty arising from using a limited number of experimental data and from interpreting experimental results. Quantitative measures for each of these two kinds of uncertainty were developed using statistical procedures. For a given peak Interstory Drift ratio the fragility functions developed herein permit the estimation of the probability of experiencing five different levels of damage in RBS moment connections.
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Approximate Lateral Drift Demands in Multistory Buildings with Nonuniform Stiffness
Journal of Structural Engineering, 2002Co-Authors: Eduardo Miranda, Carlos J. ReyesAbstract:An approximate method is presented to estimate the maximum lateral Drift demands in multistory buildings with nonuniform lateral stiffness responding primarily in the fundamental mode when subjected to earthquake ground motions. The method is aimed at the estimation of the maximum roof displacement and of the maximum Interstory Drift ratio for a given response spectrum. A simplified model of the multistory building is used based on an equivalent continuum structure with nonuniform lateral stiffness distribution consisting of a combination of a flexural cantilever beam and a shear cantilever beam. The effect of the type and amount of reduction in lateral stiffness along the height of the building and of the ratio of overall flexural and shear deformations on the ratio of the spectral displacement to the roof displacement and on the ratio of the maximum Interstory Drift ratio to the roof Drift ratio is investigated. It is shown that reductions in lateral stiffness along the height have a negligible effect o...
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approximate seismic lateral deformation demands in multistory buildings
Journal of Structural Engineering-asce, 1999Co-Authors: Eduardo MirandaAbstract:An approximate method to estimate the maximum lateral deformation demands in multistory buildings responding primarily in the fundamental mode when subjected to earthquake ground motions is presented. This method permits a rapid estimation of the maximum roof displacement and of the maximum Interstory Drift for a given acceleration time history or for a given displacement response spectrum. A multistory building is modeled as an equivalent continuum structure consisting of a combination of a flexural cantilever beam and a shear cantilever beam. The simplified model is used to investigate the ratio of the spectral displacement to the roof displacement and the ratio of the maximum Interstory Drift ratio to the roof Drift ratio. The effect of the distribution of lateral forces along the height of the building and of the ratio of overall flexural and shear deformations is examined. Lateral deformation demands of a 10-story steel building computed with the simplified method when subjected to various earthquake...
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Rapid Assessment of Building Response Using Generalized Interstory Drift Spectra
Nato Science Series: IV: Earth and Environmental Sciences, 1Co-Authors: Eduardo Miranda, Sinan AkkarAbstract:A new tool for rapid building response assessment is presented. By using a continuum model this new tool, named generalized Interstory Drift spectrum, provides estimates of maximum Interstory Drift demands in buildings responding to earthquakes. The continuous model consists of a combination of a flexural beam and a shear beam. By modifying a single parameter the model used in the generalized Interstory Drift spectrum can consider lateral deformations varying from those of a flexural beam to those of a shear beam. Therefore, it permits to account for a wide range of modes of deformation that represent more closely those of multistory buildings. Because of its computationally efficiency, and because it only requires a minimum of information about the building, the new spectrum provides a powerful tool for rapid assessment of many buildings. Examples of Interstory Drift demands from various ground motions recorded in the United States and Turkey are presented.
Gennaro Magliulo - One of the best experts on this subject based on the ideXlab platform.
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Numerical model for the in-plane seismic capacity evaluation of tall plasterboard internal partitions
Thin-Walled Structures, 2018Co-Authors: Crescenzo Petrone, Gennaro Magliulo, Orsola Coppola, Pauline Lopez, Gaetano ManfrediAbstract:Abstract A finite element model capable to capture the Interstory Drift which causes the failure of a 5 m high plasterboard partition with steel studs is defined by employing the Direct Strength Method (DSM) to assess the occurrence of different buckling failure modes. The model is validated comparing the numerical behavior with the experimental evidence of a quasi-static test campaign on a plasterboard partition. It is concluded that the model well catches the Interstory Drifts which cause either the local or the global buckling in the partition. This conclusion is also confirmed by the strain trend in the steel studs.
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shake table tests on standard and innovative temporary partition walls
Earthquake Engineering & Structural Dynamics, 2017Co-Authors: Crescenzo Petrone, Gennaro Magliulo, Gaetano ManfrediAbstract:Summary Shake table tests are performed on temporary internal partitions for office buildings. Four different specimens are tested. A steel frame is designed to exhibit relative displacements which typically occur at a given story of ordinary buildings. Four different partition walls are tested simultaneously for each specimen typology. This allows investigating the influence of an innovative device on the seismic performance of the tested components. The innovative device avoids the unhooking of the panels from the supporting studs. Several shake table tests are performed subjecting the specimens to Interstory Drift ratios up to 1.57%. Both the hysteretic curves and the natural frequency trend highlight that the partitions do not contribute to the lateral stiffness of the test setup. The damping ratio increases after the partition walls are installed within the test frame, causing a beneficial effect in the dynamic response. Minor damage state occurs for Interstory Drift ratio (IDR) in the range 0.41–0.65% in standard specimens, whereas moderate and major damage states are attained for IDR in the range 0.51–0.95%. Significant increase of collapse IDR is recorded with the introduction of the innovative device, up to IDR larger than 1.45%. It can be therefore concluded that a simple innovative device is defined, which significantly improves the seismic performance of the tested specimen. Copyright © 2017 John Wiley & Sons, Ltd.
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Shake Table Tests for the Seismic Assessment of Hollow Brick Internal Partitions
Structures Congress 2014, 2014Co-Authors: Crescenzo Petrone, Gennaro Magliulo, Gaetano ManfrediAbstract:Bidirectional shake table tests are performed on standard hollow brick partitions, subjecting the partitions simultaneously to Interstory relative displacements in their own plane and accelerations in the out-of-plane direction. Five couples of accelerograms are selected matching the target response spectrum provided by the U.S. code for nonstructural components (i.e., AC156) in order to investigate a wide range of seismic demand. Three damage states are considered and correlated to an engineering demand parameter, i.e. the Interstory Drift ratio. The tested specimen exhibits significant damage for 0.3% Interstory Drift and extensive damage for displacement close to 1.0%. The correlation between the dynamic characteristics of the test setup - in terms of damping ratio and natural frequency - and the recorded damage is evidenced.
Manfredi G - One of the best experts on this subject based on the ideXlab platform.
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Shake table tests on standard and innovative temporary partition walls
2017Co-Authors: Petrone C, Magliulo G, Manfredi GAbstract:Shake table tests are performed on temporary internal partitions for office buildings. Four different specimens are tested. A steel frame is designed to exhibit relative displacements which typically occur at a given story of ordinary buildings. Four different partition walls are tested simultaneously for each specimen typology. This allows investigating the influence of an innovative device on the seismic performance of the tested components. The innovative device avoids the unhooking of the panels from the supporting studs. Several shake table tests are performed subjecting the specimens to Interstory Drift ratios up to 1.57%. Both the hysteretic curves and the natural frequency trend highlight that the partitions do not contribute to the lateral stiffness of the test setup. The damping ratio increases after the partition walls are installed within the test frame, causing a beneficial effect in the dynamic response. Minor damage state occurs for Interstory Drift ratio (IDR) in the range 0.41-0.65% in standard specimens, whereas moderate and major damage states are attained for IDR in the range 0.51-0.95%. Significant increase of collapse IDR is recorded with the introduction of the innovative device, up to IDR larger than 1.45%. It can be therefore concluded that a simple innovative device is defined, which significantly improves the seismic performance of the tested specimen
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Shake Table Tests on Mobile Office Partitions
EUCENTRE Foundation, 2017Co-Authors: Petrone C, Magliulo G, Bonati A., Manfredi GAbstract:Shake table tests are performed on temporary internal partitions for office buildings. Four different specimens are tested. A steel frame is designed to exhibit relative displacements, which typically occur at a given story of ordinary buildings. Four different partition walls are tested simultaneously for each specimen typology. This allows investigating the influence of an innovative device on the seismic performance of the tested components. The innovative device aims at avoiding the unhooking of the panels from the supporting studs. The input to the shaking table consists of two 30-second time histories representative of a target ground motion and acting simultaneously along the two horizontal directions; the time histories are artificially defined so as their response spectra, i.e. test response spectra (TRS), match the normalized required response spectrum (RRS) provided by the AC156 code “Acceptance criteria for seismic qualification testing of non-structural components”. This represents a key issue of the study, involving choices in the standardization of the shake table test procedure on nonstructural components, with particular reference to partitions. Several shake table tests are performed subjecting the specimens to Interstory Drift ratios up to 1.57%. Both the hysteretic curves and the natural frequency trend highlight that the partitions do not contribute to the lateral stiffness of the test setup. The damping ratio increase after the partition walls are installed within the test frame, causing a beneficial effect in the dynamic response. Minor damage state occurs for Interstory Drift ratio (IDR) in the range 0.41÷0.65 in standard specimens, whereas moderate and major damage states are attained for IDR in the range 0.51÷0.95. Significant increase of collapse IDR is recorded with the introduction of the innovative device, up to IDR larger than 1.45%. It can be therefore concluded that a simple innovative device is defined, which significantly increases the seismic performance of the tested specimen
