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RE: Masonry Shear walls

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Title: RE: Masonry Shear walls

RAM unfortunately does not take into account flexible diaphragms. It also does not include collector loads as axial forces acting on the horizontal components of a vertically braced framed as the load path mechanism for transferring the diaphragm reactions into the braced bay.

D. Matthew Stuart, P.E., S.E., P.Eng.
Senior Project Manager
Schoor DePalma
Engineers and Consultants
200 State Highway Nine
P.O. Box 900
Manalapan, NJ 07726-0900
732-577-9000 ext. 1275
732-431-9428 (Fax)
908-309-8657 (Cell)

-----Original Message-----
From: Allen Adams [mailto:aadams(--nospam--at)]
Sent: Tuesday, October 22, 2002 12:50 PM
To: seaint(--nospam--at)
Subject: Re: Masonry Shear walls

Just a note of clarification: RAM Frame is certainly capable of performing
a lateral analysis, as well as the gravity analysis, of a structure of any
material, including CMU. And you can be confident in the validity of the
analysis. If you model in your steel frames and your CMU walls, the program
will distribute the lateral forces to the various elements according to
their relative stiffnesses - based on the geometry and material properties
- and location and orientation in the diaphragm. Of course proper modeling
is important, and of course there is no substitute for a proper
understanding of structural behavior (RAM - and any other computer program
- is just a tool, not a substitute for an engineer), but this type of mixed
system can be easily modeled and does not generally present any particular
difficulties for the program. Just make sure that the computer model
represents the physical reality (isolated vs connected to the diaphragm,
load bearing vs nonload bearing, etc.).
Allen Adams, S.E.
RAM International

----- Original Message -----
From: "Paul Feather" <pfeather(--nospam--at)>
To: <seaint(--nospam--at)>
Subject: Re: Masonry Shear walls



RAM is an analysis program, therefore you are most likely designing a =
steel frame structure.  If you provide CMU walls the RAM analysis is =
worthless without accounting for the interaction of the shearwall system =
and the frame system based on geometry and relative stiffness of the =
systems.  With no intention of sounding sharp, RAM is only a computer =
program and is incapable of performing a valid lateral analysis.  The =
validity of the analysis will depend on the correct modeling of the =
structure for the actual anticipated behavior, and the addition of rigid =
elements cannot be ignored or neglected, or arbitrarily assigned some =
value of lateral resistance.


Paul Feather PE, SE

  ----- Original Message -----=20
  From: Terry Triest=20
  To: Seaint=20
  Sent: Monday, October 21, 2002 9:39 AM
  Subject: Masonry Shear walls

  This question pertains to CMU walls used for back-up to masonry brick. =
   How much capacity does CMU back-up distribute to the structural =
frame?  =20

  Does anyone have information on the testing of this assembly?

  I use RAM and was wondering if (how much) I can rely on the CMU for ="">
lateral resistance.

  Terry Triest, EIT
  Structural Engineer
  P: 814-940-4041
  F: 814-949-2644=20

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