Response of tall chimneys with piled raft and annular raft foundation under wind loads considering SSI

Abstract

The effect of Soil-Structure Interaction (SSI) was studied for tall industrial Reinforced Concrete (RC) chimneys with annular raft and piled raft under along-wind load. Effects of SSI were evaluated using three different soil types and three different thickness of the annular raft.The along-wind loadwas computed according to IS:4998 (Part 1)-1992.The integrated chimney-foundation- soil systemwas analysed by finite element software ANSYS based on direct method of SSI assuming linear elastic behaviour. FE analysis was carried out for two cases of SSI; (I) chimney with annular raft and (II) chimney with piled raft. The responses in chimney and raft were evaluated for both the cases and compared to that from conventional method. It is found that due to the addition of piles, the radial bending moment and settlement of raft are significantly reduced by more than 40%, especially for very tall chimney resting on loose sand. � 2015 Taylor & Francis Group, London.