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railing design

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At 11:38 AM 2/15/99 -0600, you wrote:
>i have a handrail that has 1/2" X 1/2" verticals at 4" o.c. with a
>nominal flat stock top horizontal.  in applying the code required 200 #
>horizontal load what effective width is allowed.  another words how many
>verticals can contribute?
>another question is, what is the codefied deflection criteria?

ASTM E985 says that maximum allowable deflection is as follows:

	For horizontal load at mid-span:
		Max. Defl. = h/24 + L/96

	For horizontal load at top of post:
		Max. Defl. = h/12

	For vertical load at mid-span:
		Max. Defl. = L/96

	L = horizontal span between posts in inches, and h = vertical span of post
in inches.

Roger C. Davis
SDS Architects, Inc.