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Re: Col Stirrups

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Thor – It may depend on when the building was constructed. If it was built well before the mid-1970’s before the seismic hook requirement came into effect in ACT 318, that would offer a plausible explanation. Fred


 From: "Thor Tandy" <vicpeng(--nospam--at)>

To: "SEAInt" <seaint(--nospam--at)>

Subject: Col Stirrups


I recently saw a photo of a failed column from the Chile EQ.




In our concrete standard, CSA A23.4, "the bend for stirrups shall be min 135 unless concrete is restrained from spalling .".  I.e. bent into the column body.




Does the IBC/UBC have a similar requirement?




The photo showed a square column with column stirrups that only overlapped with a 90 hook . so unless they (Chile codes) have a waiver that allows 90 then it appears to have been constructed wrong built wrong . ?




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




Fred Turner, Staff Structural Engineer, Alfred E. Alquist Seismic Safety Commission, a public policy advisory agency of State Government, 1755 Creekside Oaks Drive #100 Sacramento, CA 95833, Turner(--nospam--at) Land Line 916-263-5506 Ext 227  Fax 916-263-0594