IMRF detailing in Seismic Category D

[sfat]

Hi,

While reviewing a single storied restaurant building project, located in high seismic area (Zone 3/category D), i noticed the structure has IMRF detailing. for example, column laps are not at mid height, but at foundation level. Since its a single storied structure, there is only one lap which is at starter of column/foundation base. Lap length is sufficient. Similar is the case in beams, that bottom bar laps are at column locations and top bars at mid span, just like IMRF system detailing. Reinforcement when checked, is found sufficient for high seismic zone force criteria.
Am i worrying too much? From linear static analysis check, column and beam sizes, foundation sizes, reinforcement, is sufficient for high seismic zone, but detailing in columns and beams is not conforming to ACI-318's chapter 21.

 

[sfat]

I would really appreciate some discussion on this topic. the building i talked about is reinforced concrete construction with beam-slab framing system. Its detailed as intermediate moment resisting frame, but designed as per forces of high seismic zone.