Jesús Miguel Bairán García

Seismic damage assessment of waffled slabs RC buildings of Barcelona

The seismic damage of waffled-slabs reinforced concrete buildings in the city of Barcelona (Spain) is evaluated using Risk-UE methodology, which enables obtaining fragility curves of the structure in a simplified manner through capacity curves. The seismic hazard is described by means of the reduced 5%-damped elastic response spectrum specific to Barcelona. Capacity curves are obtained using a non-linear static analysis and are used to obtain the performance point and probability damage matrices corresponding to the specified seismic hazard. Four different buildings, representing most typical structure configuration used in the city, are studied based on detailed data from real structures. Despite low-to-moderate seismic hazard in the region, the results show that these buildings present a considerable seismic vulnerability and a relevant expected seismic damage due to its poor expected performance.The seismic damage of waffled-slabs reinforced concrete buildings in the city of Barcelona (Spain) is evaluated using Risk-UE methodology, which enables obtaining fragility curves of the structure in a simplified manner through capacity curves. The seismic hazard is described by means of the reduced 5%-damped elastic response spectrum specific to Barcelona. Capacity curves are obtained using a non-linear static analysis and are used to obtain the performance point and probability damage matrices corresponding to the specified seismic hazard. Four different buildings, representing most typical structure configuration used in the city, are studied based on detailed data from real structures. Despite low-to-moderate seismic hazard in the region, the results show that these buildings present a considerable seismic vulnerability and a relevant expected seismic damage due to its poor expected performance.

Comparación de resultados obtenidos en el proyecto de estructuras de hormigón aplicando la Instrucción EHE-08 y el Eurocódigo 2

Resumen La Instruccion Espanola de Hormigon Estructural EHE-08 fue el resultado de una profunda revision de la anterior Instruccion EHE-98, sobre la que se realizaron numerosas modificaciones orientadas a adaptar la Instruccion al actual marco normativo europeo y al actual estado del conocimiento, promover la mejora de la calidad de las obras sin sobrecostes injustificados y contribuir al desarrollo sostenible. En dicho contexto, se realizo un trabajo orientado a comparar los resultados de aplicar la Instruccion EHE-08 y el Eurocodigo EC-2 al proyecto de diferentes estructuras. Se estudiaron seis tipos estructurales, que se consideran representativos de las obras de hormigon estructural mas frecuentes en Espana y que ademas cubren un amplio espectro de las tecnicas de construccion estructural (hormigon armado y hormigon pretensado con armaduras pretesas y postesas, construccion prefabricada y construccion in situ, estructuras de edificacion y de obra publica).

Optical angular correlation in fourier domain

Abstract The angular correlation of Fourier spectra is optically implemented by means of a single Fourier transformer. Fourier-domain-based angular correlation, which is a technique specific to periodic pattern recognition and characterization, is efficiently applied in real time to ordinary textile structures. By introducing scale corrections, either isomorphic or anamorphic, the optical system is capable of recognizing different structures of the same sort of fabric even when the fundamental frequencies—or thread densities—do not coincide. Two possible methods to introduce the information into the input image of the optical angular correlator are considered: an opto-mechanical rotator containing a transparency with the input sample image; and an electronic addressed spatial light modulator that displays the input sample image controlled by computer. Experimental results of both possibilities are presented and discussed.