Análisis estructural probabilista orientado a evaluación del daño sísmico con aplicaciones a tipologías constructivas empleadas en costa rica
- Autores: Diego Hidalgo Leiva
- Directores de la Tesis: Luis Gonzaga Pujades Beneit (dir. tes.), Jose Ramón González Drigo (codir. tes.)
- Lectura: En la Universitat Politècnica de Catalunya (UPC) ( España ) en 2017
- Idioma: español
- Tribunal Calificador de la Tesis: Horia Alejandro Barbat Barbat (presid.), Yeudy Felipe Vargas Alzate (secret.), Víctor Schmidt Díaz (voc.)
- Programa de doctorado: Programa de Doctorado en Ingeniería Sísmica y Dinámica Estructural por la Universidad Politécnica de Catalunya
- Materias:
- Enlaces
- Tesis en acceso abierto en: TDX
- Resumen
The damage assessment of structures under seismic actions, must seek the implementation of new theories, tools and procedures that reduce the uncertainty associated to the expected structural response of a building. This response could be affected by the seismic action and the conditions in which it was characterized as well as the mathematical models used to assess the materials and elements behavior and their interaction.
In this doctoral thesis, new information about the seismic hazard of Central America with emphasis in Costa Rica is presented. For this purpose, an accelerograms data base was used. It contained more than 3000 records from more than a 1000 seismic events. This data base was characterized and important peculiarities for further structural analysis were calculated. Furthermore, new seismic orientation-independent intensity measurements were determined, allowing the estimation of median and maximum values for the 5% damped response spectrum.
Also, a novel technic to estimate the maximal orientation-independent seismic hazard is proposed. With it, the calculation time cost is considerably reduced, increasing the possibility of applicability. On the other hand, a spectral matching method is presented allowing to compatibilized the response spectrum of a group of records with the design response spectra provided for Costa Rica.
For the structural analysis two typologies of common used in Costa Rica were selected. The first one is a two floors reinforced concrete masonry dwelling. The second one corresponds to a 18 storey building with dual reinforced concrete system. Both structures were designed using the Costa Rican Seismic Code and are based on real structures design by the author of this work.
For the damage assessment, the results of methods that used the capacity curves (obtained from a static non-linear analysis) are compared with the results obtained with the Park and Ang damage index and the maximum inter story drift (based on a dynamic non-linear analysis). The evaluation reveals that the behavior of both structures concurs with the design performance criteria.
The analysis is performed with deterministic and probabilistic cases applying advanced techniques to optimize the sampling of variables. Capacity, fragility and damage curves are presented and correlated with both seismic intensity measures and displacement for the 5,50 and 95 percentiles. In general, deterministic results are closely related with percentile 50, especially in the linear structural response range.
A model to parameterize the capacity curves is used. This model takes 5 parameters into account and makes possible to obtain an excellent adjustment between the original and the fitted curves. For the masonry dwelling an adjustment by sections was applied showing enhanced results.
Finally, a damage model that takes into account the capacity spectrum to adjusts the obtained damage curve with the Park and Ang Index is used. Also, an improved version of the initial damage model is proposed. This methodology shows a better adjustment, especially for structures with brittle behavior.
