Interplanar and Intraplanar Differential Settlement Analyses of Boiler Supporting Structure: Comparative Study
Publication: Practice Periodical on Structural Design and Construction
Volume 15, Issue 1
Abstract
In thermal power plants, steam generating equipment (high-pressure boilers) and its auxiliaries are in great need of usage of steel structures. The supporting system for the equipment and auxiliaries should be designed carefully after proper analysis by considering the various loads acting over it. The supporting structure should be stable, safe for the imposed loads and reliable for the equipment to function effectively. Generally, the structure is designed without considering the effect due to differential settlement. This settlement is caused due to unequal loads, heterogeneity in soil characteristics, fluctuations in ground water table etc. The present study evaluates the effect of interplanar differential settlement of isolated reinforced concrete footings on vertical loading for a boiler supporting structure. This work is in further continuation of the earlier study carried out for the same boiler supporting structure to determine the effect of intraplanar differential settlement on vertical loading by the writers presented in the subsequent sections of this paper. STAAD-III software is used for the modeling and analysis of the structure to determine the vertical load acting on each footing. A total of 430 combination trials are performed and the load factors for the various magnitudes of settlement are established. The percentage increase in vertical load is observed as 17, 20, 24, 28, and 44% for differential settlement of 10, 20, 30, 40, and 50 mm, respectively. Comparisons of increase in vertical load for each column are made between the intraplanar and interplanar differential settlement analyses. It is observed that similar columns are found to be affected for the maximum percentage increase in vertical load and the variation is marginal except for 50 mm differential settlement.
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References
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Information & Authors
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Published In
Practice Periodical on Structural Design and Construction
Volume 15 • Issue 1 • February 2010
Pages: 82 - 90
Copyright
© 2010 ASCE.
History
Received: Oct 28, 2008
Accepted: Apr 17, 2009
Published online: Apr 20, 2009
Published in print: Feb 2010
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