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The minimum design value for combined dead and live loads for formwork without motorized carts is set at 100 PSI. This specification is essential for ensuring the safety and stability of the formwork system in construction environments where the loads exerted can be significant.

Formwork serves as a temporary mold where concrete is poured and is crucial during the construction of various structures. The combination of dead loads (the weight of the formwork itself and any structural components) and live loads (the additional weight from materials, workers, and equipment) can pose substantial stress on the formwork.

Thus, the design value of 100 PSI ensures that the formwork can adequately support the anticipated loads without failing, which is vital for worker safety and structural integrity. The specification reflects industry standards to prevent accidents and material failures that can arise when formwork is not designed to the proper load capacities. This decision balances safety requirements with the practicalities of construction operations.