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RE: Dual - System ( frame+wall)

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... surely the stiffer element will take the load up before the frame deforms enough to carry loads ...?  Or is this suggesting that the base shear of a dual system is greater for frames than for shear walls ...?

Thor A. Tandy P.Eng, MIStructE, Struct Eng
Victoria, BC

 -----Original Message-----
From: y.hamida [mailto:y.hamida(--nospam--at)]
Sent: Thursday, January 10, 2008 11:36 AM
To: seaint(--nospam--at)
Subject: Dual - System ( frame+wall)

                                                                  Dual - System
         A  -  code sayes  if you have shear walls and ordinary frames (   beams+columns )  
                               to resist earthquake 
                          You can neglect the ordinary  frames and resist the entire base shear by shear walls 
                            and designe  the ordinary frames just  for axial loads.

       B  -  M y (ph.d) research sayes;

              if you have  moment resisting frames and walls( reinforce concrete or masonary  )
               to resist earthquake You cann neglect the walls and resist the entire base shear
               by  moment resisting frames  and the walls design just  for axial loads  
               and minimum reinforcement  for concrete walls and conect the masonary walls to 
                the floor by dowels  .                
                        Dr .hamida