engineering applications of raft foundation

by Dr.C.Sachpazis Date 23/04/2013 Chk'd by - Date App'd by Date RAFT FOUNDATION DESIGN (BS8110 : PART 1 : 1997) Raft and soil definition Soil definition Allowable bearing pressure; q The foundation and superstructure system is the following: - Raft with a thickness of 50 cm (L x B = 23.5 m x 13.5 m), laying on a bed of crush stone which is about 85 cm thick The inherent variability of soil parameters noticeably influences geotechnical structures such as piled-raft foundations. Advantages of Raft Foundation. It is also called as mat foundation which are widely used foundation system. This book examines alternative design procedures for plain and piled raft foundations. It is considered as one type of shallow foundation and is useful in controlling the differential settlement. Disadvantages of Raft Foundation. Raft foundation has a larger base area so reduces the pressure intensity to ground strata. It explores the assumptions that are made in the analysis of soil - structure interaction, together with the associated calculation methods. 4- Its take much time from other foundations. In accordance with regulation DIN 1054 (1994), a CPRF project is based on the idea of absorbing the total load by means of a piles system, by disregarding the supporting capacity from the foundation raft. The book gives many examples of project applications covering a wide range of structural forms and ground conditions. Raft foundation is a type of shallow foundation. Section Civil & Geotechnical Engineering Sheet no./rev. Results and discussion. Remote Sensing and Its Applications; Disaster Resistant Building. Design Applications of Raft Foundations [J. Hemsley, John Hemsley] on Amazon.com. 1- It requires little excavation. The use of a limited number of piles, strategically located, may improve both the ultimate load capacity and the settlement and differential settlement performance of the raft. Geotechnical Engineering Questions and Answers for Campus interviews on “I.S. 5-this foundation is too much expensive. 2- It can cope with the mixed or poor ground condition. A raft foundation is often used when the soil is weak, as it distributes the weight of the building over the entire area of the building, and not over smaller zones (like individual footings) or at individual points (like pile foundations).This reduces the stress on the soil. In this research the application of random fields is extended to a stochastic analysis of a piled-raft foundation embedded into an elastoplastic soil a problem that is known as complicated soil­structure interaction. It explores the assumptions that are made in the analysis of soil - structure interaction, together with the associated calculation methods. Raft Foundation Design of Raft Foundation Lecture videos. 3. Soil Exploration. What is a Raft Foundation? Engineering Applications 3.1. This type of foundation spreads the load of the building over a larger area than other foundations, lowering the pressure on the ground. The raft foundation or mat foundation is a very popular type of foundation. The maximum settlement of unconnected pile raft foundation, differential settlement of the raft foundation, axial load through the pile length and pile load ratio (α PR) is the most important results that have been concentrating in this research.The load share between the pile and the raft is a parameter that is used to design of the piled raft foundation. There are a number of reasons why this is the case: The foundation and floor slab is combined, which saves time and materials; Less excavation is required; Other reasons that make raft foundations preferable to footings are due to their engineering benefits. Raft foundation is a thick reinforced concrete slab which spreads over a large area of soil and provides support for several columns and load bearing walls. Soil Exploration; Shallow Foundations. Design of Raft Foundations - by: Dr. Hisham Arafat Mahdi For Students of Foundations' Project- Faculty of Engineering- Sixth of October University When designing the bottom reinforcement of the raft, the value at the face of the column shall be taken into account as shown in figure 12 below "section 1-1 and section 2-2". Types of foundation – Contact pressure distribution below footings and raft - Isolated and combined footings – Types and proportioning - Mat foundation– Types, applications uses and proportioning-- floating foundation. Modern codes of practice are increasingly recognising the computational power of structural analysis softwares. Raft Foundations (Width >= 6.00 m): The raft foundation is known as mat foundation; which is a continuous slab covering the entire area and resting on the foundation soil, thereby supporting the structure and transmitting load to the soil strata. Contents:Types of Raft Foundation1. Code of Practice for Design of Raft Foundations”. In situations where a raft foundation alone does not satisfy the design requirements, it may be possible to enhance the performance of the raft by the addition of piles. Civil Engineering; Advanced Foundation Engineering (Web) Syllabus; Co-ordinated by : IISc Bangalore; Available from : 2015-04-10. The economic benefits of piled raft foundations in comparison with alternative approaches have encouraged this popularity, but this comes with additional complexity for load sharing calculations in a multi-parameter problem. They are used when column loads or other structural loads are close together and individual pad foundations would interact (UWE, 2012). Before selecting raft foundation for a project, its advantages and disadvantages must be considered. The use of a limited number of piles, strategically located, may improve both the ultimate load capacity and the settlement and differential settlement performance of the raft. Shallow Foundations; Combined Footing And Raft Foundation. The book provides an in-depth analysis of topics, such as wall footings, balanced footings, raft foundations, beam and slab rafts, pile caps and pile foundations. Raft foundation can provide the provision of a basement compartment in the building. The slab is expanded beneath the whole building or at most large part of it that reduces the contact pressure against … CFG pile composite foundation has increasingly been implemented in weak soil deposits as column technology either alone [77, 78] or combined with (i) geosynthetic reinforcement [19, 59, 67, 79, 80], (ii) concrete slabs [4, 81], and (iii) other technologies such as prefabricated vertical drains [49, 82]. Embankments Constructed over Soft Ground. In this video, we wil see: ... Foundation; Tags: Combined Footing, Footing, footing example, Foundation Engineering Video, Raft Foundation, Raft Foundation example. A raft foundation is usually used when building in low soil bearing conditions to spread the load from a structure over a large area, normally the entire area of the structure (UWE, 2012). Besides the general foundation books (Bowles, Coduto, etc), which have chapters dedicated to rafts, I know only the following exclusively to raft foundations: - Hemsley, Design Applications of Raft Foundations; - Hemsley, Elastic Analysis of Raft Foundations; - Sharat Gupta, Raft Foundations. 6- this foundation we can not make for normal building. Combine Piled Raft Foundation(CPRF) is an emerging type of new foundation techniques in High rise buildings and skyscraper which raft as a shallow foundation and pile as deep foundation works sharing the total load and reduce settlement and bending moment. Raft Foundation Design for a Typical 2 Storey House Example (BS8110 : PART 1 : 1997) Job Ref. Lec : 1; Modules / Lectures. A mat foundation spreads out under […] Flat Plate Type Raft […] Staad Pro is a renowned structural analysis and design software that is used all over the world, and this post is aimed at investigating the analysis of beam and raft foundation … *FREE* shipping on qualifying offers. 3- It reduces differential settlement. Design Applications of Raft Foundations ... Engineering Design Applications of Raft Foundations by J. Hemsley (Author), John Hemsley (Editor) ISBN-13: 978-0727727657. The book gives many examples of project applications covering a wide range of structural forms and ground conditions. Raft foundation alias Mat Foundation is a large reinforced concrete slab that provides support to the various structural members like columns and walls. Chapters are written by leading consultants and contractors from around the world who draw on their extensive experience in the UK and overseas. This book examines alternative design procedures for plain and piled raft foundations. Raft foundations tend to be cheaper and quicker to use than traditional footings. Raft foundation is a reinforced concrete slab under the whole of a building or extension, ‘floating’ on the ground as a raft floats on water. The application of piled raft foundations for supporting high rise buildings has significantly increased over the last few years. A raft foundation, also called a raft foundation, is essentially a continuous slab resting on the soil that extends over the entire footprint of the building, thereby supporting the building and transferring its weight to the ground.. Raft Foundations are generally adopted for below-mentioned structure. • The stability for the whole foundation unit is secured, as the raft itself does not guarantee the stability in regards to live loads. Combined Footing And Raft Foundation; Earth Pressure. Followings are the advantages of raft foundation: The concept of stress is very basic to civil engineering. Piled raft foundations have been recognized as the most economical foundation systems, able to deal with heavy structural loads, as the bearing capacity of both the raft and pile components is considered. It explores the broad assumptions that are made in the analysis of soil - structure interaction, together with the associated calculation methods. Raft foundation is extremely advantageous to the soil which has less bearing capacity. 1. 4. In situations where a raft foundation alone does not satisfy the design requirements, it may be possible to enhance the performance of the raft by the addition of piles. Advantages of Raft Foundation. This book examines alternative design procedures for plain and piled raft foundations. According to IS codes, the maximum differential settlements should not exceed _____ in the foundation on clayey soil. What Is Raft Foundation (Mat Foundation) Advantages And Disadvantages Of Raft Foundation - Engineering Discoveries Raft Foundation are used for the commercial building where we can get high strength for any construction building. Engineering Discoveries . 1 Calc. A raft or mat foundation is a large continuous rectangular or circular concrete slab that carries the entire load of the superstructure and spreads it over the whole area beneath the building. Acoustic Emission - Microseismic Activity Principles, Techniques and Geotechnical Applications Advanced Foundation Engineering Advanced Geotechnical Analyses Advanced Geotechnical Engineering - Soil–Structure Interaction Using Computer and Material Models ... Design Applications of Raft Foundations Design Guide Helical Piles and Tension Anchors Because of the low bearing capacity of founding soil, and low deformation modulus we went for a raft foundation. 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