GIES  Geofísica i Enginyeria Sísmica
http://hdl.handle.net/2117/477
Fri, 28 Oct 2016 21:43:41 GMT
20161028T21:43:41Z

Nonlinear static procedures applied to highrise residential URM buildings
http://hdl.handle.net/2117/90865
Nonlinear static procedures applied to highrise residential URM buildings
González Drigo, José Ramón; Ávila Haro, Jorge Arturo; Pujades Beneit, Lluís; Barbat Barbat, Horia Alejandro
© 2016 Springer Science+Business Media Dordrecht In this work, the vulnerability of an unreinforced masonry building, evaluated on the one hand by using the incremental dynamic analysis, and on the other hand by using nine representative nonlinear static incremental procedures, is compared. For comparison reasons among the different nonlinear static procedures, the obtained incremental dynamic analyses results are used as reference values. The aim of this analysis is to evaluate the applicability and reliability of the diverse nonlinear static procedures for unreinforced masonry buildings, and to propose modifications oriented to improve their use in this typology of structures. For this purpose, a fully representative unreinforced masonry building of the dominating building type in the Eixample district of Barcelona, is analyzed. Furthermore, the conditional spectrum approach procedure has been applied with the aim to conveniently define the seismic demand. Regarding the definition of the fragility curves, two different methodologies were used for each nonlinear static procedure and incremental dynamic analyzes. Subsequently, the corresponding damage indices as well as the damage curves were calculated and compared for the different considered peak ground acceleration values. The results of this comparison seem to confirm that the damage curves obtained by performing the NSP and by applying the RiskUE methodology overestimate the damage corresponding to low values of the PGA and underestimate the damage for higher values of the PGA.
Wed, 19 Oct 2016 08:36:49 GMT
http://hdl.handle.net/2117/90865
20161019T08:36:49Z
González Drigo, José Ramón
Ávila Haro, Jorge Arturo
Pujades Beneit, Lluís
Barbat Barbat, Horia Alejandro
© 2016 Springer Science+Business Media Dordrecht In this work, the vulnerability of an unreinforced masonry building, evaluated on the one hand by using the incremental dynamic analysis, and on the other hand by using nine representative nonlinear static incremental procedures, is compared. For comparison reasons among the different nonlinear static procedures, the obtained incremental dynamic analyses results are used as reference values. The aim of this analysis is to evaluate the applicability and reliability of the diverse nonlinear static procedures for unreinforced masonry buildings, and to propose modifications oriented to improve their use in this typology of structures. For this purpose, a fully representative unreinforced masonry building of the dominating building type in the Eixample district of Barcelona, is analyzed. Furthermore, the conditional spectrum approach procedure has been applied with the aim to conveniently define the seismic demand. Regarding the definition of the fragility curves, two different methodologies were used for each nonlinear static procedure and incremental dynamic analyzes. Subsequently, the corresponding damage indices as well as the damage curves were calculated and compared for the different considered peak ground acceleration values. The results of this comparison seem to confirm that the damage curves obtained by performing the NSP and by applying the RiskUE methodology overestimate the damage corresponding to low values of the PGA and underestimate the damage for higher values of the PGA.

GPR Backscattering intensity analysis applied to detect paleochannels and infilled streams for seismic nanozonation in Urban Environments
http://hdl.handle.net/2117/87916
GPR Backscattering intensity analysis applied to detect paleochannels and infilled streams for seismic nanozonation in Urban Environments
Santos Assunçao, Sonia; Pérez Gracia, María de la Vega; Salinas Naval, Víctor; Caselles Magallón, Josep Oriol; González Drigo, José Ramón; Pujades Beneit, Lluís; Lantada Zarzosa, Maria de Las Nieves
Mon, 13 Jun 2016 08:54:19 GMT
http://hdl.handle.net/2117/87916
20160613T08:54:19Z
Santos Assunçao, Sonia
Pérez Gracia, María de la Vega
Salinas Naval, Víctor
Caselles Magallón, Josep Oriol
González Drigo, José Ramón
Pujades Beneit, Lluís
Lantada Zarzosa, Maria de Las Nieves

Anàlisi del risc al pla d'emergències sísmiques de Catalunya
http://hdl.handle.net/2117/87795
Anàlisi del risc al pla d'emergències sísmiques de Catalunya
Susagna, T; Pujades Beneit, Lluís; Palma, J.J
Wed, 08 Jun 2016 09:42:18 GMT
http://hdl.handle.net/2117/87795
20160608T09:42:18Z
Susagna, T
Pujades Beneit, Lluís
Palma, J.J

Detección de galerías de agua en Barcelona
http://hdl.handle.net/2117/87398
Detección de galerías de agua en Barcelona
Caselles Magallón, Josep Oriol; Clapes Boixader, Jaime; Osorio Gómez, Raúl; Pujades Beneit, Lluís; Canas Torres, José Antonio; Pérez Gracia, María de la Vega
Several zones of the northern part of Barcelona City have old water mining galleries located in the upper part of the granite formation. These galleries are now out of use and their localization are unkown. This fact involves some problemes when foundations are built near or over them. Usually geothecnical or geophysical prospecting are only carried out to detect these underground galleries when foundation has been already built and, therefore, geophysical prospecting is more difficult and hard to carry out. The presence of parts of the totally of the building foundation makes very difficult to apply some of the geophysical prospecting techniques like some electromagnetic ones. GPR prospecting surveys are one of the few techniques that are little influenced by near undergound objects, only being affected by down metallic objects or water cables. In this work we present an example of a georradar survey made in Barcelona when building foundation was already made.
Thu, 26 May 2016 16:32:06 GMT
http://hdl.handle.net/2117/87398
20160526T16:32:06Z
Caselles Magallón, Josep Oriol
Clapes Boixader, Jaime
Osorio Gómez, Raúl
Pujades Beneit, Lluís
Canas Torres, José Antonio
Pérez Gracia, María de la Vega
Several zones of the northern part of Barcelona City have old water mining galleries located in the upper part of the granite formation. These galleries are now out of use and their localization are unkown. This fact involves some problemes when foundations are built near or over them. Usually geothecnical or geophysical prospecting are only carried out to detect these underground galleries when foundation has been already built and, therefore, geophysical prospecting is more difficult and hard to carry out. The presence of parts of the totally of the building foundation makes very difficult to apply some of the geophysical prospecting techniques like some electromagnetic ones. GPR prospecting surveys are one of the few techniques that are little influenced by near undergound objects, only being affected by down metallic objects or water cables. In this work we present an example of a georradar survey made in Barcelona when building foundation was already made.

Short period Rayleighwave dispersion applied to the determination of shallow structure.
http://hdl.handle.net/2117/87395
Short period Rayleighwave dispersion applied to the determination of shallow structure.
Navarro, M; Corchete Fernández, Víctor; Badal, J; Vidal, F; Canas Torres, José Antonio; Pujades Beneit, Lluís; Caselles Magallón, Josep Oriol
Very shortperiod surface waves are useful to obtai.n the models of
shear velocity structure at shallow crustal depths. In this study, we have investigated the shear velocity shallow crustal structure of the Andarax basin (Almeria province) and Granada basin (Granada province) located in southern Spain, from inversion of fundamental mode Rayleigh wave group velocity curves generated by blasts. The analysis and inversion of Rayleigh waveforms is performed using digital filtering techniques and a generalized inversion approach. A timevariable filter has reduced the influence of noise and removed higher mode interference and multiple filtering is then used to compute group velocities from 1.13 to 1.50 km s1 for a period range between 0.6 and 2.0 sin Andarax basin. We have obtained group velocities values between 0.83 and 1.22 km s1 for a period range from 1.4 to 3.4 s in Granada basin. We have performed inversion for velocity
structure by stochastic inversion of the dispersion data, so that we have obtained shear wave velocity model down to 2 km depth for Andarax basin which shows velocities between 1.26 and 2.58 km s1 with a standard desviation band of 0.030.08 km s1 and down to 5 km for Granada basin which shows velocities from 1.01 to 3.14 km s1 with a standard desviation band of 0.050.26 km s1. The shear velocity model for Andarax basin exhibits a lowvelocity channel at depths between 200 and 500 m whereas in Granada basin the shear velocity values increases with depth. In order to guarantee the reliability of our results, we have proceeded to compute the resolution kemels at various reference depths for and observed a good coincidence between the absolute maximun of any kernels and the respective referece depth, which implies a good agreement between the calculated solution and the true solution at these depths.
Thu, 26 May 2016 15:24:47 GMT
http://hdl.handle.net/2117/87395
20160526T15:24:47Z
Navarro, M
Corchete Fernández, Víctor
Badal, J
Vidal, F
Canas Torres, José Antonio
Pujades Beneit, Lluís
Caselles Magallón, Josep Oriol
Very shortperiod surface waves are useful to obtai.n the models of
shear velocity structure at shallow crustal depths. In this study, we have investigated the shear velocity shallow crustal structure of the Andarax basin (Almeria province) and Granada basin (Granada province) located in southern Spain, from inversion of fundamental mode Rayleigh wave group velocity curves generated by blasts. The analysis and inversion of Rayleigh waveforms is performed using digital filtering techniques and a generalized inversion approach. A timevariable filter has reduced the influence of noise and removed higher mode interference and multiple filtering is then used to compute group velocities from 1.13 to 1.50 km s1 for a period range between 0.6 and 2.0 sin Andarax basin. We have obtained group velocities values between 0.83 and 1.22 km s1 for a period range from 1.4 to 3.4 s in Granada basin. We have performed inversion for velocity
structure by stochastic inversion of the dispersion data, so that we have obtained shear wave velocity model down to 2 km depth for Andarax basin which shows velocities between 1.26 and 2.58 km s1 with a standard desviation band of 0.030.08 km s1 and down to 5 km for Granada basin which shows velocities from 1.01 to 3.14 km s1 with a standard desviation band of 0.050.26 km s1. The shear velocity model for Andarax basin exhibits a lowvelocity channel at depths between 200 and 500 m whereas in Granada basin the shear velocity values increases with depth. In order to guarantee the reliability of our results, we have proceeded to compute the resolution kemels at various reference depths for and observed a good coincidence between the absolute maximun of any kernels and the respective referece depth, which implies a good agreement between the calculated solution and the true solution at these depths.

Variación del periodo propio de un edificio durante su construcción
http://hdl.handle.net/2117/87394
Variación del periodo propio de un edificio durante su construcción
Espinoza Barreras, Fortunato; Caselles Magallón, Josep Oriol; Mena Hernández, Ulises; Cruz, De La S T; Pujades Beneit, Lluís; Canas Torres, José Antonio; Clapes Boixader, Jaime
El ruido cultural o vibración ambiental se genera por el hombre debido a la maquinaria industrial, por el tráfico de vehículos, por el viento, por cambios en presión atmosférica, por actividad volcánica interna, etcétera, y se utiliza para determinar características dinámicas de suelos y estructuras entre otras aplicaciones. Las pruebas de víbración ambiental tienen la ventaja de ser eficientes, rápidas y de bajo coste. La información lograda permite mejorar el proceso de construcción de modelos matemáticos de sistemas dinámicos realizando un ajuste de sus parámetros de tal manera que se establezca la mejor correlación posible entre las respuestas predichas por el modelo y las obtenidas experimentalmente. La frecuencia natural o su inverso, el periodo propio, es de entre las características dinámicas, el parámetro más importante para la estimación de las condiciones físicas de las
estructuras. En la ciudad de Barcelona se está realizando un estudio para determinar los periodos propios de los edificios utilizando vibración ambiental como fuente de excitación.
En este trabajo se presentan los resultados obtenidos al realizar mediciones durante tres etapas de la construcción de un edificio mixto, de hormigón armado y acero, de ocho niveles. Se busca determinar la influencia de los elementos no estructurales analizando el comportamiento del periodo propio. Los resultados preliminares muestran que el periodo disminuye a medida que se incorporan elementos no estructurales al edificio, indicando un aumento de su rigidez.
Thu, 26 May 2016 15:20:39 GMT
http://hdl.handle.net/2117/87394
20160526T15:20:39Z
Espinoza Barreras, Fortunato
Caselles Magallón, Josep Oriol
Mena Hernández, Ulises
Cruz, De La S T
Pujades Beneit, Lluís
Canas Torres, José Antonio
Clapes Boixader, Jaime
El ruido cultural o vibración ambiental se genera por el hombre debido a la maquinaria industrial, por el tráfico de vehículos, por el viento, por cambios en presión atmosférica, por actividad volcánica interna, etcétera, y se utiliza para determinar características dinámicas de suelos y estructuras entre otras aplicaciones. Las pruebas de víbración ambiental tienen la ventaja de ser eficientes, rápidas y de bajo coste. La información lograda permite mejorar el proceso de construcción de modelos matemáticos de sistemas dinámicos realizando un ajuste de sus parámetros de tal manera que se establezca la mejor correlación posible entre las respuestas predichas por el modelo y las obtenidas experimentalmente. La frecuencia natural o su inverso, el periodo propio, es de entre las características dinámicas, el parámetro más importante para la estimación de las condiciones físicas de las
estructuras. En la ciudad de Barcelona se está realizando un estudio para determinar los periodos propios de los edificios utilizando vibración ambiental como fuente de excitación.
En este trabajo se presentan los resultados obtenidos al realizar mediciones durante tres etapas de la construcción de un edificio mixto, de hormigón armado y acero, de ocho niveles. Se busca determinar la influencia de los elementos no estructurales analizando el comportamiento del periodo propio. Los resultados preliminares muestran que el periodo disminuye a medida que se incorporan elementos no estructurales al edificio, indicando un aumento de su rigidez.

Spectral analysis of the Beznar dam accelerogram. Comparison with results in the northeastern of Spain
http://hdl.handle.net/2117/87083
Spectral analysis of the Beznar dam accelerogram. Comparison with results in the northeastern of Spain
Canas Torres, José Antonio; Barbat Barbat, Horia Alejandro; Pujades Beneit, Lluís; Egozcue Rubí, Juan José; Sarrate Ramos, Josep
Numerical analysis applied to the Beznar dam accelerograms (longitudinal and transversal components) shows that the Fourier amplitude spectrum is a good approximation to the pseudovelocity spectra. Thís fact makes possible to use displacement ar velocíty seismograrns to generate acceleration of the ground in places
where acceleration data are not available.
Maximae accelerations determined near and at the Beznar dam are compared wíth the predicted acceleration values far the regían compressed by the Pyrenees Mountains, the lberic System and the Catalonia Coastal Mountains usíng a established theoretical formula
far this region. Theoretical and observad values are consistent among them.
Tue, 17 May 2016 07:55:41 GMT
http://hdl.handle.net/2117/87083
20160517T07:55:41Z
Canas Torres, José Antonio
Barbat Barbat, Horia Alejandro
Pujades Beneit, Lluís
Egozcue Rubí, Juan José
Sarrate Ramos, Josep
Numerical analysis applied to the Beznar dam accelerograms (longitudinal and transversal components) shows that the Fourier amplitude spectrum is a good approximation to the pseudovelocity spectra. Thís fact makes possible to use displacement ar velocíty seismograrns to generate acceleration of the ground in places
where acceleration data are not available.
Maximae accelerations determined near and at the Beznar dam are compared wíth the predicted acceleration values far the regían compressed by the Pyrenees Mountains, the lberic System and the Catalonia Coastal Mountains usíng a established theoretical formula
far this region. Theoretical and observad values are consistent among them.

Prioritizing interventions to reduce seismic vulnerability in school facilities in Colombia
http://hdl.handle.net/2117/86746
Prioritizing interventions to reduce seismic vulnerability in school facilities in Colombia
Mora, Miguel G.; Valcarcel Torres, Jairo Andrés; Cardona, Omar D.; Pujades Beneit, Lluís; Barbat Barbat, Horia Alejandro; Bernal Granados, Gabriel Andres
Colombian seismic code NSR98 establishes the requirement for t he seismic vulnerability analysis and, if necessary, the strengthening of public facilities (schools). Due to the investments required by risk reduction pr ograms, it is necessary to establish criteria for assigning priorities for th e interventions. This article proposes a methodology for obtaining a BenefitCost Rat io (BCR) at the subnational level, by assessing the expected annual average los s of the built area of public schools and the retrofitting cost. The BCR is estimat ed as the difference between the estimates of the net present value for status quo a nd retrofitted states, these two divided by the retrofitting costs. According to the B CR, 47.3% of the total school built area of Colombia should be retrofitted where the retrofitting costs correspond to 25% of the total investment. Proposed BCR i s useful for prioritizing regions in functi on of the feasibility of reducing the seismic vulnerability of the schools.
Mon, 09 May 2016 08:35:22 GMT
http://hdl.handle.net/2117/86746
20160509T08:35:22Z
Mora, Miguel G.
Valcarcel Torres, Jairo Andrés
Cardona, Omar D.
Pujades Beneit, Lluís
Barbat Barbat, Horia Alejandro
Bernal Granados, Gabriel Andres
Colombian seismic code NSR98 establishes the requirement for t he seismic vulnerability analysis and, if necessary, the strengthening of public facilities (schools). Due to the investments required by risk reduction pr ograms, it is necessary to establish criteria for assigning priorities for th e interventions. This article proposes a methodology for obtaining a BenefitCost Rat io (BCR) at the subnational level, by assessing the expected annual average los s of the built area of public schools and the retrofitting cost. The BCR is estimat ed as the difference between the estimates of the net present value for status quo a nd retrofitted states, these two divided by the retrofitting costs. According to the B CR, 47.3% of the total school built area of Colombia should be retrofitted where the retrofitting costs correspond to 25% of the total investment. Proposed BCR i s useful for prioritizing regions in functi on of the feasibility of reducing the seismic vulnerability of the schools.

Partial duration series distributions of the European dry spell lengths for the second half of the twentieth century
http://hdl.handle.net/2117/85539
Partial duration series distributions of the European dry spell lengths for the second half of the twentieth century
Serra de Larrocha, Carina; Lana Pons, Francisco Javier; Burgueño Rivero, August; Martínez Santafé, Maria Dolors
A spatial analysis of partial duration series, PDS, of the dry spell lengths, DSL, is applied to 267 European stations during years 1951–2000. A DSL is defined as the number of consecutive days with precipitation below 0.1 mm/day. For every station, PDS are made of DSL longer than those corresponding to 95th empirical percentile. The Lskewness and Lkurtosis diagram of the PDS distributions shows that most of the stations fit well a generalised Pareto, GP, model. Only four rain gauge records at the southeast Mediterranean coast notably depart from this model. In addition, DSL maps for return periods of 2, 5, 10, 25 and 50 years are introduced by taking into account GP parameters, which are estimated by fitting the GP distribution to empirical PDS distributions of DSL. A comparative study with those obtained in a previous paper, for the whole DSL series and the corresponding best distribution model (Pearson type III), shows that the differences of DSL for the different return periods keep within ±10 % in most of rain gauges. Moreover, a principal component analysis, PCA, is applied to the four first Lmoments of the 267 rain gauges. Then, a regionalization in 11 groups is obtained after the clustering process. Finally, a regional frequency analysis is attempted, being possible to assign a GP parent distribution with different parameters to 7 out of the 11 groups.
Tue, 12 Apr 2016 09:57:25 GMT
http://hdl.handle.net/2117/85539
20160412T09:57:25Z
Serra de Larrocha, Carina
Lana Pons, Francisco Javier
Burgueño Rivero, August
Martínez Santafé, Maria Dolors
A spatial analysis of partial duration series, PDS, of the dry spell lengths, DSL, is applied to 267 European stations during years 1951–2000. A DSL is defined as the number of consecutive days with precipitation below 0.1 mm/day. For every station, PDS are made of DSL longer than those corresponding to 95th empirical percentile. The Lskewness and Lkurtosis diagram of the PDS distributions shows that most of the stations fit well a generalised Pareto, GP, model. Only four rain gauge records at the southeast Mediterranean coast notably depart from this model. In addition, DSL maps for return periods of 2, 5, 10, 25 and 50 years are introduced by taking into account GP parameters, which are estimated by fitting the GP distribution to empirical PDS distributions of DSL. A comparative study with those obtained in a previous paper, for the whole DSL series and the corresponding best distribution model (Pearson type III), shows that the differences of DSL for the different return periods keep within ±10 % in most of rain gauges. Moreover, a principal component analysis, PCA, is applied to the four first Lmoments of the 267 rain gauges. Then, a regionalization in 11 groups is obtained after the clustering process. Finally, a regional frequency analysis is attempted, being possible to assign a GP parent distribution with different parameters to 7 out of the 11 groups.

Seismic coda attenuation after the Mw=6.2 Armenia (Colombia) earthquake of 25 January 25, 1999
http://hdl.handle.net/2117/83596
Seismic coda attenuation after the Mw=6.2 Armenia (Colombia) earthquake of 25 January 25, 1999
Ugalde, Arantza; Vargas, C A; Pujades Beneit, Lluís; Canas Torres, José Antonio
Seismic wave attenuation in the central region of the Colombian Andes is studied using coda waves. Most of the events used occurred in the region on the occasion of the Armenia 25 January 1999 earthquake. The estimation of the decay rate of coda amplitudes (called coda Q1 or Qc1) is performed by means of the single isotropic scattering method of Sato [1977]. The attenuation parameters Qi1 (intrinsic absorption), Qs1 (scattering loss), and Qt1 (total attenuation) are also estimated using the multiple lapse time window method of Hoshiba et al. [1991]. The frequencies of interest lie between 1 and 15 Hz. Results show that scattering attenuation is predominant for the frequency bands 1.5 ± 0.5 and 13.5 ± 1.5 Hz, whereas the intrinsic absorption and scattering contribute in equal shares to total attenuation for the 3 ± 1, 5 ± 1, 7.5 ± 1.5, and 10.5 ± 1.5 Hz frequencies. A comparison among the estimated attenuation parameters indicates that Qc1 is close to total attenuation for all the studied frequency bands. On the other hand, no evidence in support of temporal changes of Qc1 before and after the main shock has been found. Finally, the regionalization of Qc1 values seems to correlate well with the geotectonic characteristics of the region.
Tue, 01 Mar 2016 11:34:12 GMT
http://hdl.handle.net/2117/83596
20160301T11:34:12Z
Ugalde, Arantza
Vargas, C A
Pujades Beneit, Lluís
Canas Torres, José Antonio
Seismic wave attenuation in the central region of the Colombian Andes is studied using coda waves. Most of the events used occurred in the region on the occasion of the Armenia 25 January 1999 earthquake. The estimation of the decay rate of coda amplitudes (called coda Q1 or Qc1) is performed by means of the single isotropic scattering method of Sato [1977]. The attenuation parameters Qi1 (intrinsic absorption), Qs1 (scattering loss), and Qt1 (total attenuation) are also estimated using the multiple lapse time window method of Hoshiba et al. [1991]. The frequencies of interest lie between 1 and 15 Hz. Results show that scattering attenuation is predominant for the frequency bands 1.5 ± 0.5 and 13.5 ± 1.5 Hz, whereas the intrinsic absorption and scattering contribute in equal shares to total attenuation for the 3 ± 1, 5 ± 1, 7.5 ± 1.5, and 10.5 ± 1.5 Hz frequencies. A comparison among the estimated attenuation parameters indicates that Qc1 is close to total attenuation for all the studied frequency bands. On the other hand, no evidence in support of temporal changes of Qc1 before and after the main shock has been found. Finally, the regionalization of Qc1 values seems to correlate well with the geotectonic characteristics of the region.