Abstract
The robustness of a reinforced concrete (RC) five-storey building (frame system stiffened by walls) is analysed in the paper. A high ductility class structure is designed in accordance with structural Eurocodes. The response of the structure to eight different scenarios of the ground floor vertical element loss is analysed. Nonlinear Static Analysis (NSA) and Nonlinear Dynamic Analysis (NDA) methods are used for the robustness analysis. Fragility curves of the building are derived from statistical analysis of these results. The values obtained through NSA and NDA, damage limit states of the system, and fragility curves, are compared. The influence of the position of the removed element on robustness of the structure is also analysed.
Highlights
Introduction and literature overviewUntil the end of the 1960’s, the traditional analysis of structures omitted action-loads called accidental or extraordinary loads; in the USA, they are called abnormal loads
The ratio of damage limit states corresponds to the results presented so far and to their ratio
Since buildings cannot be designed for every hazard to which the structural system may be exposed during its lifetime, a general design approach should take into account the action associated with low probability events and huge consequences for the structural system, which is characteristic of progressive collapse [7]
Summary
Until the end of the 1960’s, the traditional analysis of structures omitted action-loads called accidental or extraordinary loads; in the USA, they are called abnormal loads They occur very rarely but often have significant consequences, i.e. progressive collapse of the structure. According to papers [13, 32, 33], one or more of the following approaches can be applied in order to achieve adequate system robustness: -- structural measures: the extent of damage to structural system is limited; or the most important / key structural elements are designed to withstand any possible load, -- non-structural measures: reducing the likelihood of collapsecausing effects or reducing the intensity of the action (prevention); mitigation of the consequences of failure of system elements
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