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Anchorage to existing concrete

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Dear Colleagues,
I'm working on adding a shear wall on top of an
existing reinforced concrete wall. To develop the
required moment at the bottom of the new wall, I need
to provide a large amount of rebars at each end of the
new shear wall, and transfer their loads to the
existing concrete. So the block shear resistance and
anchorage shall be provided in a short length of the
Now, what are the possibilities for anchoring new
shear wall rebars to the existing concrete? 
I've already checked some solutions through Hilti
anchors, but it seems that the wall thickness (12") is
not enough to accommodate all required anchors.
I appreciate any comment and help on this issue,

Fariborz Tehrani,                      Phone: (310)801-4237
Civil Engineer                           Fax: (530)481-9532
BSCE, MSCE, PE                    Voice Mail: (877)743-6206
email: fmtehrani(--nospam--at)

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