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Re: [SEAOC] Glazing support[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)seaoc.org
- Subject: Re: [SEAOC] Glazing support
- From: smthengr(--nospam--at)SIRIUS.COM (Jeff Smith)
- Date: Thu, 21 Mar 1996 10:28:50 -0800
I would agree that this may be a good idea, however, in many cases drift governs in sizing moment frames, therefore reducing allowable drift could double the required moment of inertia. If a residential building is utilizing several moment frames this could increase costs significantly. So a certain amount of judgement is placed on the engineer . I have seen glazing systems that have a receiving channel that leaves a 7/8" gap all around the frame except at the sill. This is not necessarily a deflection space as there are sheet metal screws attaching the chanel to the glazing extrusions. I am curious if window manufacturers provide systems with a true deflection space to account for lateral movements? I know they can be made for vertical deflections. Also, I am curious about the reliabilty of calculating plywood diaphragm and shear wall deflections as there are numerous redundancies and secondary effects (such as finishes, unaccounted for stiffnesses around openings, damping by partitions), in addition to the fact that the formulas for diaphragm deflection is somewhat empirical. I have heard that limitations on plywood aspect ratios will be reduced in future codes, which means even more moment frames will be used in residences. I am also curious if the UBC aspect ratios are corelated to the UBC standards deflection formula? Jeff Smith >I have tried to limit story drift where large glass store-front and >glass walls (custom homes) are desired, to 0.0025h. I know that this is >twice as stiff as code allows, but since there is virtually no room for >flexibility in large glass panels I felt that less damage would incur in >a stiffer system. I am not as concerned where smaller windows are used - >such as in most residential. Here I design for 0.005h deflection (story >drift). >Hope this helps > >Dennis Wish PE >... ...
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