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Re: P-Delta

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 Hello Kris
      You made two contradictory statements.
Pl clarify.

      in first of your mail you said

The software should not produce any
extra horizontal or vertical reaction forces.

In your 2nd mail you said

The reactions from the supports however constitute the resistance of the
foundation to the external loads as well as the resistance to the
secondary loads.

Mukesh Upadhyay




                                                                                                                                       
                      "Kris Sathia"                                                                                                    
                      <kris@ca.reiusa.         To:      <seaint(--nospam--at)seaint.org>                                                            
                      com>                     cc:                                                                                     
                                               Subject: Re: P-Delta                                                                    
                      04/08/04 04:26                                                                                                   
                      AM                                                                                                               
                      Please respond                                                                                                   
                      to seaint                                                                                                        
                                                                                                                                       
                                                                                                                                       





Because the forces which are obtained in step 5 form a couple, and hence
contribute no net force, the net additional horizontal force or vertical
force on the structure is zero. The only effect that PDelta analysis
should produce - when compared with a situation where PDelta effects are
not evaluated - is additional moments on the structure which should be
reflected in the support reactions. The software should not produce any
extra horizontal or vertical reaction forces.

Kris, STAAD Support Group



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