Precast cantliver beam

[Alan Drift]

Is this valid precast cantliver beam connection inorder to carry the cantliver negative moment ?

 

[HTURKAK]

Are the columns cast in place?
I did not see such a detail and IMO , is not a valid detail.
Can you post the floor plan and some details to get the frame system ? I remember a precast balcony detail below , ( BY Kim S. Elliott )

 

[Alan Drift]

The column is precast also so it should match the 1st detail you shared that the column is spliced at every floor level

 

[BAretired]

Column rebars must be grouted twice, once in the beam and again in the upper column. Aligning columns would be difficult.

 

[ANE91]

If your plan is to cast a topping slab to increase negative moment resistance, then you need longitudinal steel in the topping and you need shearheads at the interface. You might be better off embedding near-surface reinforcement, instead.