BETA ANGLE + SEISMIC DESIGN

Re: BETA ANGLE + SEISMIC DESIGN

farid tata — Mon, 11 Apr 2011 14:21:41 GMT

Hello,

here is my model.

It is very strange as it is giving very different results for deflections with same seismic conditions.

Regards,

Re: BETA ANGLE + SEISMIC DESIGN

SKLose — Fri, 08 Apr 2011 17:06:26 GMT

Can you please post the 2 models, namely, the one with the BETA and the one without the BETA? Or, you may want to ask the Technical support people at STAAD through a service ticket.

Re: BETA ANGLE + SEISMIC DESIGN

farid tata — Fri, 01 Apr 2011 11:30:03 GMT

OK thanks for this quick reply.
now i have another question for beta angle and seismic design.
Indeed, with configuration 1, i have only 13mm deflection in seismic design, whereas with config 2 it is coming 51mm.

Config 1

Config 2

The main difference is that the upper beams have a beta of 90deg in the second configuration.

I don't think mechanical behavior can explain this big difference in the deflection.

Do you have an idea on why i am getting so much difference between the two designs?

Thanks again

Re: BETA ANGLE + SEISMIC DESIGN

SKLose — Fri, 01 Apr 2011 10:48:07 GMT

When you assign a beta angle, a command is recorded in the STAAD input file under the CONSTANTS heading. The command usually looks like

BETA 90 MEMBER ....

After you re-open the file, go into the editor and check whether the command is present.