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plastic hinge & plastic hinges detailing - mowafi3m - 01-13-2011 plastic hinge
As a column experiences earthquake-induced lateral displacements while supporting gravity loads, severe damage is observed in regions subjected to large moments. These regions are commonly referred to as plastic hinges and they experience large inelastic curvatures. The inelastic curvatures in plastic hinges are typically assumed to be constant over the plastic hinge length, lp, to simplify the estimation of the tip displacement of a column. Therefore, if the plastic hinge length is known, the tip displacement of a column can easily be obtained by integrating curvatures, and vice versa. As part of the research reported in this paper, the effects of axial load and shear span-depth ratio (L/ h) on lp are evaluated experimentally. Based on the experimental observations, a new analytical approach that can be used to estimate lp is presented. Finally, the research findings are synthesized into a simple expression that can be used to estimate lp Code: *************************************** plastic hinges detailing
In recent revisions of the structural design codes in New Zealand, a number of changes have been made to seismic design provisions. One of the more significant revisions was the way in which the level of detailing is determined for potential plastic hinges. Previously, the level of detailing was based principally on the structural ductility factor, which is broadly similar to the reduction factor R used in U.S. practice. With the revision, the level of detailing is based on the predicted magnitude of curvature that a plastic hinge is required to sustain in the ultimate limit state. This paper explains why the structural ductility factor does not give a reliable guide to the deformation sustained in an individual plastic hinge. In addition, based on test results of 37 beams, 25 columns, and 36 walls, design curvature limits are proposed for different categories of plastic hinge. Code: *************************************** RE: plastic hinge & plastic hinges detailing - Grunf - 01-13-2011 Code: *************************************** If you like those publications, CivilEA's Team strongly suggest you to buy them! Support the authors! |