63 Wastewater treatment plant modernisation Extension and modernisation of the existing wastewater treatment plan, the plant consists of 4 venting shafts grouped by two with longitudinal post-tensioning. The key figures: - dimensions of two shafts = 110 m x 70 m x 10,5 m - concrete: 11500 m³ - reinforcement steel: 1520 tons Compared with the pre-design bill of material, an economy of 726 m³ of concrete and 59 tons of reinforcement steel has been achieved by using a refined analysis model. Two different models were used: - a full shell model in order to obtain the internal forces in the straight parts - a refined local model to take into account the eccentricity between the two walls and the spreading of the post-tensioning into the walls. The internal design forces given by the program could then be used to derive the necessary reinforcement in this area. ESA-Prima Win software has been used. Short Description
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