Effect of Design Parameters on Piled Rafts in Sand under Eccentric Triangular Loads

被引:3
作者
Bhartiya, Priyanka [1 ]
Basu, Dipanjan [2 ]
Chakraborty, Tanusree [1 ]
机构
[1] Indian Inst Technol, Dept Civil Engn, New Delhi 110016, India
[2] Univ Waterloo, Dept Civil & Environm Engn, Waterloo, ON N2L 3G1, Canada
关键词
Piled raft design; Finite element; Load eccentricity; Load distribution; Settlement; Angular distortion; STATE PARAMETER; MODEL; PERFORMANCE; FOUNDATIONS; STRATEGIES;
D O I
10.1061/(ASCE)GM.1943-5622.0002375
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
Piled raft foundations (PRFs) below stepped high-rise towers are often subjected to nonuniform triangular-shaped loads with eccentricities. In this study, 20 rectangular piled rafts with different pile configurations and orientations, embedded in medium-dense sandy soil, are analyzed using three-dimensional nonlinear finite-element (FE) analysis in which the critical state-based Clay and Sand Model (CASM) is used as the soil constitutive model. Different triangularly distributed loads with and without eccentricities are considered in addition to uniformly distributed loads. A systematic parametric study is performed by varying the different design parameters based on which the PRF behavior is systematically investigated in terms of multiple performance parameters such as maximum settlement, differential settlement, angular distortion, tilt, and load distribution between the raft and the piles and between the individual piles. It is observed that the pile diameter, number of piles, and raft plan area control the differential settlement, angular distortion, and tilt the most. Based on the insights gained from the parametric study, a design optimization exercise is performed, in which the most optimal pile configuration is selected based on the criteria of allowable settlement and angular distortion with additional considerations for tilt, load distribution, and the volume of concrete required.
引用
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页数:20
相关论文
共 54 条
[1]   On the use of 1g physical models for ground movements and soil-structure interaction problems [J].
Al Heib, Marwan ;
Emeriault, Fabrice ;
Nghiem, Huu-Luyen .
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING, 2020, 12 (01) :197-211
[2]   Performance of micropiled raft in sand subjected to vertical concentrated load: centrifuge modeling [J].
Alnuaim, A. M. ;
El Naggar, H. ;
El Naggar, M. H. .
CANADIAN GEOTECHNICAL JOURNAL, 2015, 52 (01) :33-45
[3]   A STATE PARAMETER FOR SANDS [J].
BEEN, K ;
JEFFERIES, MG .
GEOTECHNIQUE, 1985, 35 (02) :99-112
[4]   Serviceability-Based Finite-Element Approach on Analyzing Combined Pile-Raft Foundation [J].
Bhaduri, Aniruddha ;
Choudhury, Deepankar .
INTERNATIONAL JOURNAL OF GEOMECHANICS, 2020, 20 (02)
[5]   Load-settlement response of piled raft foundations in sand [J].
Bhartiya, Priyanka ;
Chakraborty, Tanusree ;
Basu, Dipanjan .
GEOMECHANICS AND GEOENGINEERING-AN INTERNATIONAL JOURNAL, 2022, 17 (04) :1260-1283
[6]   Nonlinear subgrade modulus of sandy soils for analysis of piled raft foundations [J].
Bhartiya, Priyanka ;
Chakraborty, Tanusree ;
Basu, Dipanjan .
COMPUTERS AND GEOTECHNICS, 2020, 118
[7]   Settlement Estimation of Piled Rafts for Initial Design [J].
Bhartiya, Priyanka ;
Chakraborty, Tanusree ;
Basu, Dipanjan .
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING, 2020, 146 (02)
[8]  
Bolton MD., 1994, Proc. 8th in. conf. on computer methods and advances in geomechanics, P537
[9]  
Bowles J.E., 1996, Foundation analysis and design, V5th
[10]  
Burland JB, 1995, INVITED LECT 19 CONV, V2, P21