Boiler Supporting Structure and Boiler Roof in India
The boiler supporting structure contains the combustion chamber and is used as the main stiffening element of the coal‑fired plant in Neyveli, Tamil Nadu, India. The boiler supporting structure measures 100 ft x 100 ft x 406.8 ft and, together with the boiler roof arranged above, it has to withstand loads of about 50,706 t.
Structural Analysis and Design
Voss & Kamb und Partner GmbH, Kaiserslautern, Germany
Alstom Boiler Deutschland GmbH, Stuttgart, Germany
The engineering office of Voss & Kamb, a customer of Dlubal Software, was in charge of the structural analysis and the connections.
Boiler Supporting Structure and Boiler Roof
The load capacity of the 406.8-foot-high boiler supporting structure amounts to about 9,259 t. Due to the high loading, the structure is made completely of box sections. At the floor level, the support sections have dimensions of 7.9 x 7.9 ft and a wall thickness of 3.1 in.
All platforms are fastened at the boiler supporting structure. In the final state, half of the platforms (at a height of about 230 - 400 ft) hang on the brackets of the boiler supporting structure as "hanging houses".
At the rear wall, the flue gas duct (d ~ 49 ft) is also suspended at the brackets of the boiler supporting structure.
Due to its location, the structure has to withstand very high wind loads. The analysis and design of the boiler supporting structure (including buckling analysis) was performed with RSTAB.
The boiler roof, with a load capacity of about 992 t, was analyzed and designed with RFEM. The model consists of a combination of members and surfaces (24.6‑foot-high beams of the boiler roof). Eurocode 3 was used as the design standard.
Connections in Tekla Structures
The model created in Tekla was imported to RSTAB using the direct interface. The structure was further modified during the analysis.
The detailing of the connections was again performed in Tekla Structures according to the structural analysis.
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For the stability design of members and sets of members with a uniform cross-section, you can use the equivalent member method according to EN 1993-1-1, 6.3.1 to 6.3.3. However, as soon as a tapered cross-section is available, this method can no longer be used, or used only to a limited extent.
SHAPE-THIN determines the effective cross-sections according to EN 1993-1-3 and EN 1993-1-5 for cold-formed sections. You can optionally check the geometric conditions for the applicability of the standard specified in EN 1993‑1‑3, Section 5.2.
The effects of local plate buckling are considered according to the method of reduced widths and the possible buckling of stiffeners (instability) is considered for stiffened sections according to EN 1993-1-3, Section 5.5.
As an option, you can perform an iterative calculation to optimize the effective cross-section.
You can display the effective cross-sections graphically.
Read more about designing cold-formed sections with SHAPE-THIN and RF-/STEEL Cold-Formed Sections in this technical article: Design of a Thin-Walled, Cold-Formed C-Section According to EN 1993-1-3.
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