The Influence of Raft Thickness on the Behaviour of Piled Raft Foundation

Nguyen, Tong; Le, Phuong Hong; Tran, Viet Thai

doi:10.1109/gtsd50082.2020.9303145

Cited by 2 publications

(1 citation statement)

References 6 publications

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“…The piled raft foundation has only been studied and has not been accepted under the regulations yet. In Ho Chi Minh City, load sharing by the raft is 20-21%, depending on the number of piles and the limit of raft thickness to match the ultimate bending moment for optimum design [13].…”

Section: Cases Historiesmentioning

confidence: 99%

Piled Raft - An Effective Foundation Design Method for High-Rise Buildings in Ho Chi Minh City, Viet Nam

Amornfa¹

2021

GEOMATE

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Nowadays, the wave of construction of high-rise buildings, which usually use the concept of piled group foundation in their design, has increased in Ho Chi Minh City as well as other cities in Viet Nam. In this study, settlement, the load shared by the raft, and the behavior of the piled raft were considered via monitoring settlement and the Poulos-Davis-Randolph (PDR) method where the settlement of a varying number of piles, the pile length, and raft embedment were determined. The results of settlement monitoring of a high-rise building in Ho Chi Minh City showed that the foundation design of this building was conservative, with a ratio of allowable-to-actual settlement of 9.3. In the simplified method, the proportion of load share by raft was 2.8% (which was ignored in the piled foundation concept), with the settlement results being in good agreement with the measurement results. The parametric analysis indicated that the piled spacing/piled diameter was 5 -7 times the recommended optimum value. Furthermore, increasing the pile length decreased settlement. The pile length was equal to 30 times the pile diameter, which was effective for the settlement ratio. In addition, the raft load share reached 30% of the applied load when the raft was put in the second layer of stiff-to-very-stiff clay. The study indicated the simplified method was effective for evaluating the preliminary conditions of the foundation, settlement, and that a piled raft was feasible for Ho Chi Minh City's subsoil geology.

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Section: Cases Historiesmentioning

confidence: 99%

Piled Raft - An Effective Foundation Design Method for High-Rise Buildings in Ho Chi Minh City, Viet Nam

Amornfa¹

2021

GEOMATE

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Raft Thickness Rational Design for Megatall Skyscrapers: Case Studies

Van

2024

Eng. Technol. Appl. Sci. Res.

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The design process for tall buildings involves three main steps: Estimating roughly the sizes of foundation and superstructure components, verifying the determined sizes with full consideration of the interactions between soil, piles, raft, and superstructure to ensure the bearing capacity and deformation of all elements, and optimizing the design with parametric analysis. However, the thickness of the rafts in existing buildings appears to be very thick and varies to the point of confusion. It is noticeable that some buildings have a considerable height but a relatively small raft thickness and vice versa. To address this issue, a simplified graphical method is proposed to determine the raft thickness for the initial design phase. As megatall skyscrapers become increasingly common, a more comprehensive study of rafts is necessary. This article explores the process of designing and constructing rafts for tall and megatall skyscrapers. The study aims to validate and extend the graphical method and establish a basis for the raft thickness optimization process. The research shows that the number of floors strongly affects the thickness of the rafts. However, the elastic modulus is significantly influenced when the ratio of the raft thickness to the number of floors is less than 5% and vice versa.

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The Influence of Raft Thickness on the Behaviour of Piled Raft Foundation

Cited by 2 publications

References 6 publications

Piled Raft - An Effective Foundation Design Method for High-Rise Buildings in Ho Chi Minh City, Viet Nam

Piled Raft - An Effective Foundation Design Method for High-Rise Buildings in Ho Chi Minh City, Viet Nam

Raft Thickness Rational Design for Megatall Skyscrapers: Case Studies

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