Displacement-Based Assessment of Reinforced Concrete Frames in Earthquakes


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Title: Displacement-Based Assessment of Reinforced Concrete Frames in Earthquakes

Author(s): J. F. Bonacci and J. K. Wight

Publication: Special Publication

Volume: 162


Appears on pages(s): 117-138

Keywords: anchorage (structural); beams (supports); columns (supports); deformation; earthquake-resistant structures; joints (junctions); reinforced concrete; shear properties; structural design; Structural Research

Date: 8/1/1996

Members of earthquake-resisting reinforced concrete frames--such as beams, columns, joints, and anchorages--are designed on the basis of force demands. Detailing requirements are established from collected experimental observations of measures which are most effective in maximizing overall cyclic toughness of frame assemblies. 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; 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 vs. 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.