Quantification of Residual Axial Capacity of Beam-Column Joints in Existing Concrete Buildings Under Seismic Load Reversals

Abstract eng:
Earthquake reconnaissance has reported the substantial damage that can result from inadequate beam-column joints in earthquake shaking. In some cases, failure of oldertype corner joints appears to have led to building collapse. Insignificant research attention has been focused on beam-column joints of older construction that may be seismically vulnerable. Concrete buildings constructed prior to developing details for ductility in the 1970s normally lack joint transverse reinforcement (unconfined joints). The available literature concerning the performance of such joints is relatively limited, but concerns about their seismic axial failure exist. The main goal of this study is to quantify the axial collapse vulnerability of shear-damaged unconfined exterior and corner beam-column joints under cyclic load reversals. The quantification of the residual axial capacity of these joints is performed incorporating the test results of four full-scale three dimensional corner beam-column joint subassemblages, along with few other tests available in the literature to develop analytical models for joint axial capacity. Two axial capacity models designed for unconfined joints were developed. The proposed models correlated with previous test results. Within the practical range of beam-column joint dimensions, the axial failure appears unlikely. However, this result is obtained based on a small dataset. More tests are needed to verify the developed models and to investigate the axial failure likelihood for joint dimensions not included in the presented models.

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