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Simple Beam?
[Subject Prev][Subject Next][Thread Prev][Thread Next] To: "SEAINT" <seaint(nospamat)seaint.org>
 Subject: Simple Beam?
 From: "vicpeng" <vicpeng(nospamat)telus.net>
 Date: Fri, 9 Aug 2002 18:54:29 0700
Using any software you like, model a simply supported beam of any length
and put any load you like on it. I can do this by hand, but an anomally
occurs when I use 2D software, and also RISA.
Case 1: Restrain one end. What is the axial
displacement of the other end as the beam bends?
Case 2: Restrain BOTH ends. What is the axial
restraining reaction at each end?
This is not a trick question but perhaps highlights the choice of software
one should use for any given problem. The likes of Pframe, RISA, and
probably others use "small deflection" analysis, which is easy for the program
coder and usually userfriendly. "Sophisticated" programs use finite
element and probably work energy procedures for their analyses.
My question is (and yes, I know I need a life . Are there identifiable criteria, or rules of
thumb, for deciding which software package one should use for any given
problem? Or is it simply a matter of how many decimal places I might
want? Points that have emerged from this deliberation include the modeling
of a 3D (3 or more orthogonally placed beams to a joint) beam column that
ignores the torsional stiffness effect of those orthogonal beams, and so
on.

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