Evaluation of the Effect of Soil-Structure Interaction on the Raft of Tall Reinforced Concrete Chimneys Under Across Wind Load

A three-dimensional (3D) soil-structure interaction (SSI) analysis of 300 m high reinforced concrete chimneys having piled annular raft and annular raft foundations subjected to along-wind load is carried out in the present study. To understand the significance of SSI, four types of soils were considered based on their flexibility. The effect of stiffness of the raft was evaluated using three different ratios of external diameter to thickness of the annular raft. The along-wind load was computed according to IS:4998 (Part 1)-1992. The integrated chimney-foundation-soil system was analysed by commercial finite element (FE) software ANSYS, based on direct method of SSI assuming linear elastic behaviour. FE analyses were carried out for two cases of SSI (I) chimney with annular raft foundation and (II) chimney with piled raft foundation. The responses in chimney such as tip deflection, bending moments, and base moment and responses in raft such as bending moments and settlements were evaluated for both cases and compared to that obtained from the conventional method of analysis. It is found that the responses in chimney and raft depend on the flexibility of the underlying soil and thickness of the raft.

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Study the seismic response of reinforced concrete high-rise building with dual framed-shear wall system considering the effect of soil structure interaction

Materials Today Proceedings ◽

10.1016/j.matpr.2020.12.111 ◽

2021 ◽

Author(s):

Wesam Al Agha ◽

Waleed Alozzo Almorad ◽

Nambiappan Umamaheswari ◽

Amjad Alhelwani

Keyword(s):

Reinforced Concrete ◽

Seismic Response ◽

Soil Structure ◽

Shear Wall ◽

Soil Structure Interaction ◽

Structure Interaction ◽

High Rise ◽

High Rise Building ◽

Wall System

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Soil-structure interaction analysis in reinforced concrete structures on footing foundation

Soils and Rocks ◽

10.28927/sr.2021.058020 ◽

2021 ◽

Vol 44 (2) ◽

pp. 1-12

Author(s):

Yago Ryan Pinheiro dos Santos ◽

Maria Isabela Marques da Cunha Vieira Bello ◽

Alexandre Duarte Gusmão ◽

Jonny Dantas Patricio

Keyword(s):

Reinforced Concrete ◽

Soil Structure ◽

Interaction Analysis ◽

Soil Structure Interaction ◽

Structural Elements ◽

Reinforced Concrete Structure ◽

Load Path ◽

Structure Interaction ◽

Load Redistribution ◽

Field Instrumentation

Soil-structure interaction (SSI) evaluates how soil or rock deformability imposes on the structure a different load path in a hypothesis of fixed supports, altering the loads acting on the structural elements and the ground. This paper discusses the results of the SSI effects in two buildings with a reinforced concrete structure and shallow foundations in a rock mass. The settlements were monitored by field instrumentation in five stages of their construction, making it possible to estimate through interpolation curves the settlements values of some points. The numerical modeling and structural analysis of the buildings were obtained for two different cases of soil-structure interaction. The structure was considered having fixed supports (non-displaceable) and displaceable supports (with stiffness spring coefficients K). The results reveals the occurrence of SSI effects, with a load redistribution between the columns that occurred differently for the different construction stages. Structural modeling proved to be quite representative, pointing to higher vertical load values than the average values present in building edge zones, which contradicts the conventional idea that central columns are more loaded than the edge columns. The soil-structure interaction analyses resulted in different behaviors regarding both towers; pointing out that low settlements and building symmetry in plan minimize the effects of interaction, with no tendency of load redistribution between columns as the structure rigidity increases, as construction development.

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