anchoring into existing brick wall

huangyhg

anchoring into existing brick wall
i need to support a new metal joist floor on existing two-wythe exterior solid brick wall with an air cavity.  the two wythes are bonded together with brick units in what i think is called common bond pattern.  the wall is only 8" thick.  the building is two story high and was built in 1950's.  i am using marino joists that are connected to a joist track and the track will connect to the wall.  hilti recommends adhesive anchors which i do not like very much because of their loss of strength in case of fire.  any ideas to the kind of anchors to use?  
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first, the brick wall should not have an air cavity between the two wythes.  if it is a bearing wall, the collar joint should be filled with mortar.
that being said, i would grout the collar joint solid, and probably install through bolts and fish plates, unless the brick was in very sound condition.
can you cut pockets for the joists and have the bearing near mid point of wall
dik
ckar,
if the wall is only 8 inches thick, it really doesn't have a cavity.  don't know why you would try to grout it as epr suggested if the two wythes are adequately bonded.  if they are not bonded properly, could retrofit brick ties by drilling and injecting the type with sleeve which prevents the grout from escaping into voids.  see hilti.
i think the hilti adhesive anchors, again with sleeves, are appropriate for connection of the track.  anchor should engage both wythes.  if fire is a consideration, protect the anchors.  don't you have to protect the metal floor joists anyway?  
if you have a fire, then the joists will char and have to be replaced. if the load on the anchors is only in shear then the anchor bolt will bear up against the sides of the hole and in my opinion, will not collapse. the whole floor will still need to be replaced anyhow.
to take outward load in a fire event you could put a continuous ledger along the length of the wall and then place through bolts at every 6' to take lateral loads under fire. this is better for progressive collapse too.
i generally like the screened adhesive anchors into brick, especially of that age which has been exposed to the elements.  older bricks sometimes have a tendancy to go soft, and expansion type anchors may loosen over time.
i would get the anchor rep involved, and plan on spec'ing pull tests...
thanks for your replies.  i think i will go with the adhesive anchors.  to answer hokie66, the wall is 8"thick.  the brick wythes are 3 1/2" each and not 4".  to engage both wythes i have to go with 6" long anchors.  these they have to be installed in a zig-zag fashion at the bottom and top of the track alternatively so they can take moment.  under the track i have to install a steel angle to provide bearing for the metal joists per the manufacturer's recommendations.  again this angle has to be anchored into the wall.  the anchors have to be two brick minimum distance from each other in each direction.