Displacement-Based Assessment of Reinforced Concrete Frames in Earthquakes

In this paper, a displacement-based approach to evaluating detailing requirements for frame elements is presented. Expressions are derived for the participation of beams, columns, joints and anchorages in overall story drift. Simple element models are presented for beam-column joints and anchorages, and guidelines for conventional sectional analysis of beams and columns are given. With an assessment of the local demand in each element type and mechanical models of element behavior, it is demonstrated that member variables normally considered as part of detailing can be accounted for in a quantitative supply-versus-demand fashion. A case study is made for an example in the ACI Committee 352. Recommendations to illustrate how a displacement-based frame evaluation is carried out and to provide a reference point for comparison with an existing design approach for beam-column joints.