Replacing moment frame by outrigger/belt truss
Replacing moment frame by outrigger/belt truss
(OP)
According to ASCE07-05 table 12.2-1 , Special reinforced shear wall is not allowed to be used for SDC (E)for buildings exceeding 160 ft in height.
This put requirements for adding moment frame to Special reinforced shear wall(Dual system) for resisting seismic force.
My question is ,can the moment frame replaced by any of the following
1- outriggers truss in both directions provided at 1 floor connecting premeter columns to RC core wall
2- Belt truss along the four sides of the building connected columns (lets say 2 bays each side) provided in one floor
This put requirements for adding moment frame to Special reinforced shear wall(Dual system) for resisting seismic force.
My question is ,can the moment frame replaced by any of the following
1- outriggers truss in both directions provided at 1 floor connecting premeter columns to RC core wall
2- Belt truss along the four sides of the building connected columns (lets say 2 bays each side) provided in one floor






RE: Replacing moment frame by outrigger/belt truss
I don't feel that either option satisfies the intent of the code provision. The outrigger trusses are worthless if the core walls fail so I don't feel that system adds much to the overall redundancy of the structure. The one story belt truss system only adds redundancy at one story and could be argued to effectively create a vertical stiffness irregularity within your building which may well make things worse seismically.
You might want to look into performance based design as an alternative. If it allows you to stick with a core wall only system, it may well prove the most economical solution.
The greatest trick that bond stress ever pulled was convincing the world it didn't exist.
RE: Replacing moment frame by outrigger/belt truss
Another question ,Did you manage to do performance based design for shear wall building before? if yes what software package did you use?
and what element type did you use to model wall non linear behavior?
RE: Replacing moment frame by outrigger/belt truss
Hopefully you'll be around to help me sort things I out when I finally get a chance to try my hand at this!
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough that I want to either change it or adopt it.
The greatest trick that bond stress ever pulled was convincing the world it didn't exist.
RE: Replacing moment frame by outrigger/belt truss
i am trying to use Etabs 2013 for that .
sure , you can post your question if you need any assistance at time you start with non linear procedure