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Improvement of Structural Robustness Against Progressive Collapse of the Structure using In-Fill Walls

B S Keerthi Gowda, V Lokesh, G L Easwara Prasad

Abstract


Despite the increasing concern in progressive collapse resistant design and analysis of reinforced concrete building it was triggered by accidental and man-made extreme events occurred over the last couple of decades. Only a few studies, especially numerical ones have been carried out so far on the role of masonry infill walls on it. Much the same as on account of seismic tremor building application, infills are typically considered as non-structural or architectural components. Thus, its resistance is omitted; likewise, present design norms do not give explicit signs concerning this point. Although such considerations lead to an ease in work of design and analysis of structural elements, it may also give rise to misleading and overly conservative results, considering masonry-infills also may result in additional vertical resistance. Consequently, this article gives the results of an enormous number of progressive collapse simulations planned for evaluating the impacts of infill walls on the vertical load-carrying limits of reinforced concrete frames for various areas of damage. Thus, it is important to evaluate the interaction between the structural elements and surrounding frames at different stages of the response. The present article portrays the outcomes after validation of the proposed model which was utilized to anticipate behavioral changes in the reaction of infilled reinforced concrete structures, as a result of parametric varieties in the geometry of the selected models. Counterpart bare frames were also analyzed to present a vice-versa comparison in terms of resistance and demand capacity of both the structures.

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References


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