Seismic Behavior of Lightly-Reinforced Concrete Column and Beam-Column Joint Details
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This report summarizes an investigation of lightly reinforced concrete column and interior beam-column joint details which have been commonly used in regions of moderate seismicity over the past fifty years. The overall program includes small scale cyclic and shaking table tests and medium-scale shaking table tests of similar frame joints, flat plate structures, analytical modeling of the behavior, and simulation of the response of typical buildings. The results of full-scale joint tests, described in this report, show that the splice regions of frames not designed for earthquakes are able to sustain moderate demands and that large deformations occur in the joint region, especially in cases where the bottom beam bars are not continuous. The large flexibility may be detrimental to the performance of taller structures. Stronger joint designs may place greater demands on the column splice. The simulation of the nonlinear dynamic response of frames with these weak details and shaking table tests of three-story buildings are continuing.