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  • Writer's picturegreg southall

Project Focus - Part 2 - Construction Stage Management (CSM)

We continue with our series of mini videos, this one introducing construction sequencing of the concrete frame within the finite element analysis environment.

Project Focus - Part 2 - Construction Stage Management (CSM) follows our previous Part 1 post where we introduced the Analytical Mode generation (AMG) within the Revit+SOFiSTiK workflow.

The challenging design included slabs of 250mm thick spanning upto 9.0m along the perimeter edge with perimeter edge cantilever balconies to further add to the complexity. With a very light facade and finishes, the temporary construction loads dictate the ultimate limit state (ULS) design. As the structure is 20 storey, the inclusion of 5 storey height perimeter screens needed to be included into the design of the slabs. This meant a design being required for two specific temporary load conditions during construciton in addition to the permanent loading the building will experience for most of it's life.

This meant we had to study the behaviour under construction of the load distribution and resulting forces in the structure and the temporary propping. Therefore we extended the construction sequencing to include the physical modelling of both the slab backpropping and also the perimeter screen propping which apply at different stages of the build

We created groupings for all the physical structure, temporary propping (both slabs and perimeter screens), along with all temporary construction loads reflecting the casting of slabs over and the climbing 5 storey height perimeter screens.

The video shows the full construction stage management of the build and captures the temporary and permanent loading throughout the life of the building. A non-linear material analysis of the same sequence was used to accurately capture the long term serviceability effects, deflections and cracking behaviour of the structure. There are over 200 construction stages in the model and over 50 creep and shinkage stages. This analysis run time was over 6hrs.

To conclude, this detailed piece of work was essential and a valuable excercise providing us confidence and certainty of the structure behaviour and ultimately to deliver refinement and value to our Clients.

Drop us a line if you are interested and want to learn more on this topic.

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