scholarly journals Soil-Structure Interaction of a Piled Raft Foundation in Clay – a 3D Numerical Study

2016 ◽  
Vol 48 (4) ◽  
pp. 388-407 ◽  
Author(s):  
Endra Susila ◽  
◽  
Nita Anggraini ◽  
Keyword(s):  
Soil Structure ◽  
Numerical Study ◽  
Soil Structure Interaction ◽  
Structure Interaction ◽  
Piled Raft ◽  
Piled Raft Foundation ◽  
Raft Foundation

scholarly journals Effect of Dynamic Soil-Structure Interaction on Raft of Piled Raft Foundation of Chimneys

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
B. R. Jayalekshmi ◽  
S. V. Jisha ◽  
R. Shivashankar ◽  
S. Soorya Narayana
Keyword(s):  
Soil Properties ◽  
Ground Motion ◽  
Soil Structure ◽  
Seismic Analysis ◽  
Direct Method ◽  
Soil Structure Interaction ◽  
Structure Interaction ◽  
Piled Raft ◽  
Piled Raft Foundation ◽  
Raft Foundation

This paper presents numerical analysis of soil-structure-interaction (SSI) of tall reinforced concrete chimneys with piled raft foundation subjected to El Centro ground motion (1940) using finite element method. Seismic analysis in time domain was performed on the basis of direct method of SSI on the three-dimensional SSI system. The chimney, foundation, and soil were assumed to be linearly elastic in the analysis. The stress resultants and settlement of raft of piled raft foundation were evaluated under different soil properties and different geometrical features of raft and chimney. Soil properties were selected based on the shear wave velocity corresponding to sand in the loose to dense range. Chimneys with different elevations of 100 m, 200 m, and 400 m were taken with a ratio of height to base diameter of chimney of 17. Raft of different thickness was considered to evaluate the effect of stiffness of foundation. Results were analysed to assess the significance of characteristic of the ground motion. It is found that the response in the raft depends on the different parameters of chimney, foundation, and soil. It is also found that the higher modes of SSI system are significant in determining the response in the raft.

scholarly journals Soil-Structure Interaction Analysis of Tall Reinforced Concrete Chimney with Piled Raft and Annular Raft under Along-Wind Load

2013 ◽  
Vol 2013 ◽  
pp. 1-14 ◽  
Author(s):  
B. R. Jayalekshmi ◽  
S. V. Jisha ◽  
R. Shivashankar
Keyword(s):  
Reinforced Concrete ◽  
Soil Structure ◽  
Wind Load ◽  
Soil Structure Interaction ◽  
Elastic Behaviour ◽  
Bending Moments ◽  
Structure Interaction ◽  
Piled Raft ◽  
Raft Foundation ◽  
Annular Raft

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.

A numerical study on the influences of underlying soil and backfill characteristics on the dynamic behaviour of typical integral bridges

Bauingenieur ◽  
2020 ◽  
Vol 95 (11) ◽  
pp. S 2-S 11
Author(s):  
H. D. B. Aji ◽  
M. B. Basnet ◽  
Frank Wuttke
Keyword(s):  
Soil Structure ◽  
Dynamic Behaviour ◽  
Numerical Study ◽  
Coupled System ◽  
Soil Structure Interaction ◽  
Dynamic Resistance ◽  
Soil Characteristic ◽  
Structure Interaction ◽  
Integral Bridges ◽  
Underlying Soil

Abstract The identification of the dynamic behaviour of a structure is one of the crucial steps in the design of the dynamic resistance of the structure. The dynamic behaviour is represented by the natural frequencies and damping which are subsequently used along with the considered dynamic actions in the design process. In regard of integral bridge concept, one of the consequences of the omission of joints and bearings is the substantial soil-structure interaction which in turn increases the sensitivity of the dynamic behaviour of the bridges to the surrounding soil characteristic. In this article, we extended our hybrid BEM-FEM steady-state dynamic numerical tool to the 3D regime, developed by utilizing an in-house BEM and the commercial FEM software ABAQUS and use it to analyse the dynamic interaction between the bridge and the underlying soil as well as the backfill. The numerical results from four typical integral bridges show that underlying soil characteristic has great effect on the resonant frequencies and the damping. The backfill material properties tend to have less significant role due to the abutment wingwalls dominating the force transfer between the soil and the superstructure. The results also show that the degree of influence of the soil-structure interaction on the coupled system is affected by the type of load pattern in addition to the flexural stiffness of the superstructure.

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