High-rise structural delivery and BIM coordination

As structural design team lead on the Central Bank of Kenya Pension Towers (KSH 3.5 B), I found the hardest problem on a tall building is rarely the frame. It is coordination — keeping the structural model honest against an architecture that keeps moving and building services that need every void you would rather not give them.

Where coordination breaks

On a high-rise, a clash that would be trivial on a two-storey building multiplies through the floors. A misplaced riser, a beam that fouls a duct, a transfer structure agreed late — each one is repeated forty times. The cost of fixing it on site is the cost of the clash times the floor count, and on a tower that arithmetic is unforgiving.

This is where building information modelling earns its place in Kenyan practice. Not as a marketing line, but as a single coordinated model where the structural, architectural, and services teams resolve clashes before the drawings are issued for construction. The value is not the model; it is the argument the model forces the team to have early, on screen, instead of late, on site.

What I would tell a younger engineer

Model what you will build, not what you wish you were building. Keep the structural assumptions visible to the rest of the team. And remember that on an institutional building the design has to survive supervision and audit — the coordinated model is only useful if the issued drawings, the site record, and the as-built agree with one another at handover.