By Gross J. L., Engelhardt M. D., Uang C.
The Congressional emergency appropriation because of the January 17, 1994, Northridge earthquake supplied the construction and fireplace study Laboratory (BFRL)at the nationwide Institute of criteria and expertise (NIST) a chance to extend its actions in earthquake engineering below the nationwide Earthquake HazardReduction software (NEHRP). as well as the postearthquake reconnaissance, BFRL centred its efforts totally on post-earthquake hearth and lifelines and on moment-resisting metal frames.
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Extra resources for Modification of Existing Welded Steel: Moment Frame. Connections for Seismic Resistance
Example text
1 and accounts for strain hardening and other factors that increase the moment at the center of the RBS beyond the plastic moment, . 1 was established from experimental data on connections in the NIST/AISC test 39 © 2003 by American Institute of Steel Construction, Inc. All rights reserved. This publication or any part thereof must not be reproduced in any form without permission of the publisher. and dividing by the plastic moment at the center of the RBS, where was taken as the actual yield stress of the test beam based on tensile coupon tests.
When gravity loads supported by the beam or girder are large, plastic hinges may form within the midspan region and, in such cases, the location of the plastic section must re-evaluated. 3 Column-Beam Moment Ratio The connection modifications described in this Design Guide move the plastic hinge in the beam away from the face of the column. 5) haunches or other types of reinforcement. These larger beam end moments increase the likelihood of developing flexural plastic hinges in the columns in the region outside of the joint.
As described earlier, if higher plastic rotation capacities are desired, the new construction details described in the Interim Guidelines (FEMA 1995) and Advisory No. 1 (FEMA 1996) provide an alternative approach. It should be recognized that regardless of the detail chosen for connection modification, some damage should still be expected in a very strong earthquake. Local buckling of beam flanges generally develops at large plastic rotations. Should these high levels of plastic rotation be experienced in a very strong earthquake, costs would likely be incurred to repair the beam local buckles and other potential damage.
Modification of Existing Welded Steel: Moment Frame. Connections for Seismic Resistance by Gross J. L., Engelhardt M. D., Uang C.
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