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Analytical study of shell thickness variation models for natural draught cooling tower on vertical pile foundation
Vamsee Krishna, N. V1, Rama Mohana Rao, K2.
Natural Draught Cooling Tower (NDCT) is an important and essential structure in
nuclear and thermal power stations as it contributes both to the energy efficient output and
balance to an environment. From the structural point of view, high rise concrete structure is
subject to various dynamic loads in an unfavorable way. Wind loading is important in NDCT
design for structural safety, elastic stability, vibration properties and the initiation of concrete
cracking in comparison to other structures. The behavior change of NDCT due to the variation of
shell thickness when NDCT rested on a vertical pile foundation is very interesting. Therefore, the
objective of the present paper is to briefly present the finite element modeling and analytical
study of NDCT with twenty-seven different types of shell thickness models for the same height
of NDCT. Each model is identified based on the separate case number from 1 to 27, and FEM
analysis was carried out using Staad Pro-V8i software considering gravity loads, wind load.
Further, design wind pressure at different levels along the height of NDCT was calculated as per
IS 875 (part 3) 1987 code after applying Interference factor (IF) of 1.573. Due to the lack of wind
study findings, the IF was considered as 1.573 while the maximum value of IF was 1.43 as per
BS: 4485 (1975). Distribution of wind pressure at each level of NDCT in the circumferential
direction was as per IS11504-1985. The overall study identified optimum shell thickness varying
models to obtain the optimum foundation as well as super-stable structure. Further, the
comparison was made between the guest and peak factor method and found that wind load due to
gust factor method was critical and therefore recommended.
Affiliation:
- Jawaharlal Nehru Technological University, India
- Jawaharlal Nehru Technological University, India
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