Abstract
Capacity of components subjected to earthquake actions is still a widely interesting research topic. Hence, developing precise tools for predicting drift capacities of reinforced concrete (RC) columns is of great interest. RC columns are not only frequently constructed, but also their composite behavior makes the capacity prediction a task faced with many uncertainties. In the current article, novel empirical approaches are presented for predicting flexural, shear and axial failure modes in RC columns. To this aim, an extensive experimental database was created by collecting outcomes of previously conducted experimental tests since 1964, which are available in the literature. It serves as the basis for deriving the equations for predicting the drift capacity of RC columns by different regression analyses (both linear with different orders and nonlinear). Furthermore, fragility curves are determined for comparing the obtained results with the experimental results and with previously proposed models, like the ones of ASCE/SEI 41-13. It is demonstrated that the proposed equations predict drift capacities, which are in better agreement with experimental results than those computed by previously published models. In addition, the reliability of the proposed equations is higher from a probabilistic point of view.
Highlights
The design of reinforced concrete (RC) structures involving natural hazards, especially earthquake excitations, has been significantly advanced in the past few decades, still considerable uncertainties exist
The expected behavior of columns is classified based on the ratio of plastic shear to nominal shear (Vp/Vn). This approach is widely recommended in other regulations such as ASCE/SEI 41-13 [27]
At first a comprehensive database for RC columns was presented, which includes 196 experiments for column failure in flexure and shear, which the latter is further categorized into two failure mode subsets, i.e., flexure-shear and shear, and 50 experiments for column failure in the axial failure mode
Summary
The design of RC structures involving natural hazards, especially earthquake excitations, has been significantly advanced in the past few decades, still considerable uncertainties exist. Reliable failure estimates enable the designer to evaluate the local and global behavior of structures subjected to different external. Article history: Received Aug 10, 2018; Accepted Oct 8, 2018 actions It would be important from design perspective for new structures, and from assessment and strengthening point of view for existing buildings. A major percentage of existing buildings were constructed prior to novel seismic design codes being proposed. They may not present a satisfactory behavior under future possible earthquakes, which led variety of solutions to be developed or significant strengthening costs to be induced to societies annually [1]
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