Seismic Design of Pile Foundations for Different Ground Conditions (original) (raw)

Seismic Design Considerations for Pile Foundations

2011

Pile foundations are adopted commonly for various types of multi-storeyed structures when the founding soil is weak and soft; and also in industrial structures, bridges, offshore structures. With increasing infrastructural growth and seismic activities, designing the pile foundations for seismic conditions is of considerable importance for the efficient function of the structures especially, the lifeline structures like bridges etc. Several studies were conducted by various researchers on the seismic analysis and design of the pile foundations and evolved different theories on the same. Codes of practice available in different countries suggested some procedures for seismic design of pile foundations. This paper presents a short discussion on the various theories evolved on seismic pile performance concepts followed by outlines of suggested procedures by selected international and Indian codes on the subject. A soil profile is selected from Assam, Dibrugarh area as an exemplary case...

Soil-Pile Interaction Under Seismic Load for Different Ground Condition

International Journal of Advance Engineering and Research Development

Pile foundations are commonly adopted for various types of multi storied and industrial structures, bridges and offshore structures. Their seismic design is very important to ensure efficient functioning of various structures even under severe seismic loading conditions. In the design process, ground conditions (soil type) play an important role in terms of seismic loads transferred to foundation and foundation capacity. This paper presents seismic design of pile foundations for different ground conditions. Estimation of seismic loads, for a typical multi-storied building considered being located in different seismic zones, for different ground conditions according to Indian standard are presented. Design considerations based on various theories evolved on pile foundation performance concepts under seismic conditions are discussed. Three different ground conditions are selected as exemplary cases in demonstrating the evaluation of seismic loads and seismic design of pile foundations as per codes of practice.

Seismic design of pile foundations: structural and geotechnical issues

Proceedings of the Third International Conference on …, 1995

SYNOPSIS Research on soil-pile-structure interaction under dynamic loading over the past 20 years has led to a variety of analysis approaches of varying complexity to address a range of dynamic problems. Many of these analysis approaches have been adapted for use for the seismic design of pile foundations. In this paper, the various analysis methods are only briefly reviewed. The focus of discussion is on design concepts and issues more routinely used or encountered by structural engineers during seismic design of new or retrofitted pile foundation systems representative of those used for bridges and buildings.

Dynamic Analysis of Pile Foundation with Footing in Different Foundation Soils

Several studies have done to obtain storey displacement to recognize the structural safety in various loading conditions. The types of soil, types of foundation and building frame form a complete structural system to resist the external loads. In earthquake prone areas the extensive damage is caused due to the failure of foundation (sub structure) that leads to the displacement of structure which causes loss of human life and economy. Types of foundations, footings and foundation soils have greater impact on stability and design criteria of structure. In this research, an attempt has been made to find the effect of deep foundation (single under-reamed friction pile) with or without square footing on the displacement behavior of a four storied, one bay frame resting on different types of soil under dynamic loading using the finite element analysis software ANSYS WORKBENCH (18.0). It is well known that the foundation failures during earthquake excitation are greatly influenced by the ...

VARIATION OF CARRYING CAPACITY OF PILE FOUNDATIONS DUE TO NEWLY FORMING EARTHQUAKES

Pile foundations are used when the structure is subjected to higher loads such as high-rise building, flyovers, etc. or in a situation such that the soil condition is not supportive for heavy loads (i.e., presence of clayey soil). Pile foundation requirements depend on soil conditions as well as lithospheric characteristics of the tectonic plate that holds the construction site, among other factors. Geographical location of Sri Lanka is well away from the borders of the Indo-Australian tectonic plate; therefore, tremors and significant scale earthquakes have not been often reported in comparison to the peripheral countries locate at the plate boarders. Moreover, the most of the historically reported significant earthquakes affected Sri Lanka showed inter-plate tremor characteristics with a diluted impact on the structure. Because of these reasons seismic retrofitting techniques are not widely popular in Sri Lankan structures as well as the piling treatments as part thereof. However, in 2012 April, a series of tremors reported in the Indian Ocean closed to Sri Lanka indicating intra-plate characteristics. Furthermore, several minor tremors have been regularly reported in the South, Eastern and Central parts of the country ever since. In light of these new developments, this paper investigates the current standards and practices of piling used in for structures and construction projects in Sri Lanka and suggest possible update of piling practices reflecting the necessity of such adaptation.

STRUCTURAL ANALYSIS OF BRIDGES AND PILE FOUNDATION SUBJECTED TO SEISMIC LOADS

IRJET, 2022

An Effect of various materials of pile foundation of bridges in response of the seismic loading condition has to be monitored. Such an analysis was required to verify the performance of each structure acting under seismic loads. In this study, a numerical model is developed to evaluate both bridges and pile foundation performance with respect to varying seismic loading conditions. Specifically speaking to evaluate the performance of various structural materials used as pile foundation for bridges against seismic loads. The vibrational behavior of the bridge was also evaluated on the basis of seismic loads on the structure. Furthermore, pile foundation of the bridge was modeled along with combination of soil in order to analyze the behavior of the structure with soil. Also the bridge pile foundation of different structural material namely structural steel, carbon fibre reinforced steel and epoxy fibre reinforced steel were modeled using ANSYS software. It was observed that Carbon fibre reinforced structural steel is superior in performance as compared to that of the structural steel and epoxy fibre reinforced structural steel in both pile foundation as well as development of bridge structure. Maximum nodal displacement for bridge structure with respect to seismic load conditions for different materials were Carbon fibre structural steel as 63.104 mm, Epoxy fibre structural steel as 69.992 mm and Structural steel as 70.091 mm respectively.

Influence of Inherent Soil Variability on Seismic Response of Structure Supported on Pile Foundation

Arabian Journal for Science and Engineering, 2019

Traditional seismic design is limited to fixed base assumption of superstructure. Such perception proved to be misleading from the post facto analysis of different failure case studies. In addition, inherent variability of soil parameters may lead to a considerable effect on seismic response of foundation and superstructure elements. Incorporation of shear strength variability of soil along with dynamic soil structure interaction phenomenon may result in increased or decreased transmitted shear to the pile as compared to fixed base shear which may lead to unsafe or over-safe pile design. The present study assesses the influence of shear strength variability of soil on seismic response of pile foundation considering soil nonlinearity. Probabilistic analysis is performed by Monte Carlo simulation technique. The study infers that variability of shear strength parameters of soil has significant effect on response of pile embedded in clay, while such effect is marginal in sandy soil. However, it is also observed that adoption of different pile-soil interaction modeling contributes variability in probabilistic response of pile. Finally, a case study shows the importance of shear strength variability of soil on increase in percentage of steel requirement in pile foundation.

Influence of Material Variability on the Seismic Response of Pile Foundation

Pile foundation response during earthquakes is strongly affected by the type of material used in pile construction. In the present study three different types of materials viz. concrete, wood and bamboo are used to construct pile foundation. Specimens of clean sand and clay soil are used to prepare the soil for test and the physical properties of that soil are evaluated. Next, earthquake response analyses are conducted to clarify the effect of the nonlinear soilpile foundation system on the performance of pile foundation. The input shaking included sinusoidal earthquake accelerations. Pile displacement, acceleration, strain and earth pressure are found out using PULSE and MICRON software. Performance evaluation of the pile foundation is discussed on the basis of pile curvature.

A Review on Effect of Pile Stiffness on Seismic Response of Structure

International Journal for Research in Applied Science and Engineering Technology (IJRASET), 2021

Pile foundations are widely employed for a variety of structures on shaky ground. The importance of seismic design in ensuring the effective operation of a structure under severe seismic loading conditions cannot be overstated. For the analysis of seismic forces on a structure, IS 1893 will be employed. This research entails the choosing of a specific form of building structure. A comparison of buildings with and without pile foundations will be shown. Because of the differences in their properties, the seismic behaviour of the various structures differs. The influence of pile stiffness on the structure's seismic response will be investigated. The rigidity of the piling foundation could have an impact on the structure.With the rise in seismic activity, there may be a need for more efficient pile foundation design to withstand earthquake loads. The major goal of this study is to compare pile stiffness with changes in diameter and zone.