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Posted: Wed Jan 21, 2004 11:49 am Post subject: Master-Slave etc.
Hello Rajiv When we apply a horizontal Concentrated load at beam col. junction we get axial force in beams because of equilibrium of the system not because of relative movement of the ends of the beam.
So if i calculate the lateral forces manually & apply these as joint loads i will get axial forces in beams. Using master slave option we are telling the software to calculate & distribute the lateral forces (acc to stiffness of the different frames) internally. So why Staad cannot give value of axial forces in beams using master slave option; when it is giving shear forces in columns.
firstname.lastname@example.org To: email@example.com 01/21/04 09:37 cc: AM Subject: Re: Master-Slave etc. Please respond to general
When you use master slave option you are introducing a constraint in your model that the two ends of the beam can't move w.r.t. each other. So axial forces will be zero (because of constraint in your model). That is the reason STAAD is not printing them.
I must add here that the presence of large axial forces in horizontal members (beams) must be recognised in a few cases like Arch-Tie sytems, Virendeel Girders etc. In such cases you will have to use other modelling options to capture Axial forces in beams. Hope this helps
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