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RE: QUESTION REGARDING CONCRETE MOMENT FRAMES[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
- Subject: RE: QUESTION REGARDING CONCRETE MOMENT FRAMES
- From: Brian McDonald <mcdonald(--nospam--at)exponent.com>
- Date: Tue, 14 Nov 2000 11:05:12 -0800
ACI 318-99 references the SEAOC Blue Book, 6th Ed., which reads in Section C404.1, "The geometric constraints for flexural members are based primarily on past practice. The limit on the width-to-depth ratio is intended to provide compact cross sections that have a reasonably low risk of lateral instability in the nonlinear range of response..." Farzad Naeim's Seismic Design Handbook, page 308, states that the limitations are based on testing, but does not give a reference.
Based on that, I would venture to say if you have an alternate means of assuring lateral stability/bracing after much cracking, relaxing the width-to-depth limitation would be justified.
(Say "hi" to Ken for me.)
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