PSI - Issue 84

Ahmed Amir Khalil et al. / Procedia Structural Integrity 84 (2026) 1031–1038

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are located inside the reinforced concrete shell, with a height of 123 m. The FRP liners have an external diameter at the base of around 7.92 m. Such liners are supported by two steel platforms located at two different levels. The reinforcements consist of two layers of steel meshes, external and internal. The vertical rebars are φ22 diameter while the horizontals are φ18. Trimmer rebars are implemented around all the openings of the outer reinforced concrete shell. Figure 2 shows the geometry of the stack and a detail of the trimmer rebars at the access opening.

Fig. 1. (a) Plan view of the boiler unit with the axis’s nomenclature and (b) elevation view looking north

Fig. 2. (a) 3D AEM model of the stack, isometric view, (b) plan view, (c) detail of trimmer rebars at the construction opening