IBC/UBC seismic warning

I have a problem on this either.. but my tutor said it does not affect the safety of the design. Cab anyone expound on this?

Sorry, we did not understand the question. Can you please elaborate?

Hi!    

I'm new with STAAD and i'm using 2005. I'm having trouble with some errors and i do not know how to correct them :

1. "... if the UBC/IBC  has tension/compression.. " - Error notice

2. " density not provided, self weight ignored.. "

Please enlighten me on these errors, What does it mean and How do I correct it ?

 

1. When UBC/IBC load cases are present in the model, each such load case must be followed by a PERFORM ANALYSIS and CHANGE command. For example LOAD 1 IBC LOAD X PERFORM ANALYSIS CHANGE LOAD 2 IBC LOAD X PERFORM ANALYSIS CHANGE LOAD 3 SELF Y -1 LOAD 4 FLOOR LOAD YRA 13.9 14.2 FLOAD -3.2 .. .. 2. In the DEFINE MATERIAL command, check whether you have specified DENSITY for the material. If you have not, the warning you encountered will appear. Without density, the weight of the entities to which that material is assigned cannot be calculated.

1. When UBC/IBC load cases are present in the model, each such load case must be followed by a PERFORM ANALYSIS and CHANGE command. For example LOAD 1 IBC LOAD X PERFORM ANALYSIS CHANGE LOAD 2 IBC LOAD X PERFORM ANALYSIS CHANGE LOAD 3 SELF Y -1 LOAD 4 FLOOR LOAD YRA 13.9 14.2 FLOAD -3.2 .. .. 2. In the DEFINE MATERIAL command, check whether you have specified DENSITY for the material. If you have not, the warning you encountered will appear. Without density, the weight of the entities to which that material is assigned cannot be calculated.

It worked perfectly THANK YOU !!!!. :-)

Hmmmm... now i'm into slab. It keeps failing. 

first, i made a 0.18m thick slab and assigned it to the most critical slab surface in my structure.

then I designed it with the following properties :  fc=20700kn/sqm             fyld=276000Kn/sqm         bars from D10-d12

                                                                                       I chose max. moment for the design, and selected DL and LL for loadings

The span is only 3m by 4m, i even tried 2m x 3 m span and it keeps failing. Is there something i should look into to correct this failure ?

 

 

 

respected sir,madam
every time when iam designing the building and error is showing (given below) so tell me what is solution. i used indian code 1893-2002
*WARNING: IF THIS UBC/IBC ANALYSIS HAS TENSION/COMPRESSION OR REPEAT LOAD OR RE-ANALYSIS OR SELECT OPTIMIZE, THEN EACH UBC/IBC CASE SHOULD BE FOLLOWED BY PERFORM ANALYSIS & CHANGE"
thanking you
sandeep singh jamwal
email: ssjamwal124@gmail.com

To get rid of the warning, you will need to add a PERFORM ANALYSIS and CHANGE after each seismic case. You may refer to the following post for more details

communities.bentley.com/.../264284

Can you upload your model file?

RESPECTED SIR
YES IHAVE UPLOAD MY STADD FILE PLEASE SEND YOUR EMAIL ID :-
THANKING YOU