One of the most important tasks in geomechanical research is executing analytical and numerical simulations to understand geomechanical phenomena. In order to attain this objective, researchers have to prepare data to perform the simulations, build the models that define the appropriate physical representation and the mathematical modeling of the problem, run a computer system capable of simulating the phenomenon, and visualize and interpret the results. This paper presents the main functional requirements to support the development of solutions that encompass the simulation of geomechanical problems, taking into account a collaborative environment with access to an efficient computer infrastructure. The paper also describes ERAS, a portal developed according to these requirements, highlighting the advantages it brings to researchers in this area. Resumo. Uma das tarefas mais importantes na pesquisa de geomecânica é a execução de simulação numérica e analítica para compreensão dos fenômenos geomecânicos. Com este objetivo, os pesquisadores preparam os dados para realizar as simulações do problema em questão; constroem o modelo que define a representação física apropriada e a modelagem matemática do problema; executam a computação capaz de simular o fenômeno estudado; e visualizam e interpretam os resultados. Este artigo apresenta os principais requisitos funcionais para apoio ao desenvolvimento de soluções que envolvam simulação de problemas geomecânicos, considerando um ambiente colaborativo com acesso a uma infraestrutura computacional eficiente. O artigo também apresenta o ERAS, um portal que está sendo desenvolvido de acordo com estes requisitos, destacando as vantagens que ele traz aos pesquisadores da área.

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A cable stayed bridge with a signature design destined to be an icon in the region has been recently built in the city of Talavera de la Reina in central Spain. Although Spain is a country with no significant seismic peril, the recent earthquake that took place in the city of Lorca in the year 2011, with a Richter magnitude value of 5.1, has promoted studies of several structures of social and economical relevance. Therefore, a comprehensive analysis of seismic effects of the mentioned cable stayed bridge has been performed.The study carried out included seismic analysis in both the frequency and time domain, considering several sources of nonlinearity as cable sag, cable prestress distribution and large displacements. Nonlinear seismic time history analyses were conducted considering artificial earthquakes in the three spatial directions.In addition to the dynamic analysis a computer video was produced showing the expected deformation of the bridge for each of the natural modes of vibration and the seismic event. The bridge model developed for the visualization is very precise and contains many details, so the perception of the viewer of the computer video will be very similar to what will be seen if a real earthquake would happen in the bridge site.

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