Seismosoft | Earthquake Engineering Solutions

Hi,

So far I used that type of links only in simple models (not real)... unfortunately i cant't help you with that.

I am also surprised with the stability observed with Newmark with respect to HHT.
Perhaps your isolation system/accelerogram is such that imposes the structure to respond elastically and mainly in the firsts modes of vibration... In this case, i believe the superiority of the HHT with respect to Newmark integration scheme will be reduced.

Cheers

I do have the book by Priestley - a fantastic book by the way, one which I use often - but cannot run the example problems on the current version of Seismostruct.

Perhaps my judgement of the HHT integration scheme as inferior to the Newmark scheme was premature. I was trying simple models and the Newmark integration option did run some scenarios that HHT failed on. I have further improved the models and see no difference in the two now - perhaps when the models become more complex to represent the actual structures in my research, I may find HHT to be superior. We'll see.

I am happy to send simple models to anyone interested.

Great program anf the forum helps.

Huffe and Muntasir,

You are right, the latest version of SeismoStruct is not opening properly the models you mention.

Whilst we will be addressing this problem in a future release, we can nonetheless suggest you a workaround to get things working, by simply opening the *.spf file in Wordpad or similar, and introduce in the following lines:

deck 100000. 1.0000E+008 9.9280E+008 10000. 19.37
rigid 1.0000E+009 1000. 2.5000E+008 1.0000E+008 0.

the terms highlighted below in bold:

deck User-Defined 100000. 1.0000E+008 9.9280E+008 10000. 19.37 0.00 1e20
rigid User-Defined 1.0000E+009 1000. 2.5000E+008 1.0000E+008 0. 0.00 1e20

(make sure that a [TAB] is introduced before and after "User-Defined", and that two [TAB]s are introduced before "0.00 1e20")

Hope the above is of some assistance.

Seismosoft Support

This method worked like a charm as far as getting the model to run. However, when I go to select items for post-processing (still in the pre-processor) nothing shows up. So it runs fine and I can see the real-time plotting of the deflected shape, but I cannot see any results in the post-processor.

Thanks very much for the tip. Any additional tips on the post-processign issue would be welcome as well.

Dear Huffte,

Apologies for the continued difficulties in working with these old models. The new release of the program, to be available this coming week, will solve all this. Thanks for the patience.

Seismosoft Support