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U nited A rab E mirates U niversity C ollege of E ngineering C ivil and E nvironmental E ngineering D epartment G PowerPoint Presentation
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U nited A rab E mirates U niversity C ollege of E ngineering C ivil and E nvironmental E ngineering D epartment G raduation P roject I. D esign O f F oundation F or S pace F rame M ultipurpose H all I n A bu- D habi A rea. Prepared By: H aifa S aeed L aila S aeed

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slide1

United Arab Emirates UniversityCollege of EngineeringCivil and Environmental Engineering DepartmentGraduation Project I

Design Of Foundation For Space Frame Multipurpose Hall In Abu-Dhabi Area

Prepared By:

Haifa Saeed

Laila Saeed

Zainab Mohammed

Examiners names:

Dr. Saeed Harib.

Dr. Ashraf Biddah.

Prof. Abdullah Al-Shamsi.

2ndSemester 2004-2005

slide2

Outline

  • Introduction:
  • Multipurpose Hall Structure.
  • Shallow Foundations and Pile Foundations.
  • The Suitable Foundation.
  • Soil investigation:
  • Borings, Sampling and Testing.
  • Water Table Level.
  • Pore Hole log.
  • Bearing capacity of rock and sand soil.
  • Theories and Analysis.
  • Conclusion.
  • Summary & Impact.
slide3

Introduction

Multipurpose Hall Structure:

- Design of foundation for the multipurpose hall (Gymnasium).

- The proposed structure's type for gymnasium is a combination of steel and concrete.

- The roof of gymnasium is space frame steel.

- The other structural elements are reinforced concrete.

slide4

Structure Elements

Super Structure:

All structure’s elements that lies on the earth such as slabs, beams, columns and roofs.

Sub Structure:

Foundation which transmit all loads of the superstructure to the suitable and strong soil layer and it should be:

- Located properly so as not to be adversely affected by outside influences.

- Safe from bearing capacity failure (collapse) and excessive settlement.

slide5

Types of Foundations

Shallow Foundations:

Founded near to the finished ground surface; where the founding depth (Df) is less than the width of the footing and less than 3m. It include footings, mat or raft foundation.

Pile Foundations:

Long and slender structural members which transfer the load to deeper soil or rock of high bearing capacity avoiding shallow soil of low bearing capacity.

slide6

Pile Foundations

Classification:

Load transmitting. Pile material. Effect on the soil

Load transmitting:

1.End bearing piles

2.Friction piles

3.Combination of friction and end bearing piles

Pile material.

1.Timber. 2.Concrete

3.Steel. 4.Composite piles

Effect on the soil.

1.Driven piles.

2.Bored piles.

slide7

Load transmitting

Load

Load

Soft

Soil

Pile

Pile

Firm

Soil

Ground Reaction

Friction piles.

End bearing piles

slide8

Pile Material

Timber piles.

Concrete piles.

Steel piles

slide9

Effect on the soil

Bored piles.

slide10

Effect on the soil

Driven piles

slide11

Pile Cap

  • Piles are arranged in groups of three or more.
  • The group of piles is commonly tied together by a pile cap.
  • Pile cap is reinforced concrete slab attached to the head of individual piles and causes the several piles to act together as a pile foundation.
  • The main propose of pile cap is to distribute the load from a column equally between piles.
slide12

Suitable Foundation

Depends on:

1.The character of the soil

2.The presence of the water at the site.

3.The magnitude of the imposed loads and the project characteristics

  • Project soil:
  • The soil of Abu Dhabi is weak due to the existence of salts.
  • High water table level.
  • Lies on coastline, there is an extensive deposit of bioclastic sand and silt.
  • Therefore, the suitable foundation is the pile foundation.
slide13

Soil Investigation

  • Objectives
  • It includes:
    • Boring
    • Sampling
    • Testing
slide14

Boring

  • Definition
  • Drilling or driving a hole into the earth's surface.
  • Types
    • Trial pits
    • Shafts and headings
    • Percussion boring
    • Mechanical auger
    • Wash borings
    • Hand and portable augers
    • Rotary drilling
slide15

Hand Auger

  • Used for:
    • Depths of around 5m.
    • Fine particles
    • Cohesive Soil
slide16

Rotary Drilling

Advantages:

- Its progress is faster than other methods

- Disturbance of the soil is slight

slide17

Sampling

Definition

Taking samples from the filed or site to determine soil types and in-place characteristics of soil .

  • Types
    • Disturbed sample
    • Undisturbed sample
slide20

Sampling Techniques

  • Disturbed samples:
    • Drill tools
    • Drive sampling
    • Rotary sampling
  • Undisturbed samples :
    • Trial pit.
slide21

Testing

  • The main tests:
    • Standard Penetration Test (SPT)
    • Unconfined Compression Strength Test (UCT)
slide22

Standard Penetration Test

  • It aims to determine the SPT N-value, which gives an indication of the soil stiffness.
slide23

Standard Penetration Test

  • After SPT, a disturbed sample is obtained for examination and testing.
slide24

Unconfined Compressive Strength

Objective

Determine shear strength of a cohesive soil in an inexpensive manner.

slide26

Record of Soil Investigation

  • There are three types of soil records:
    • Geologic profile
    • Map
    • Boring log sheet
slide29

Bearing Capacity

Definition

Theories

slide33

Bearing Capacity Analysis

Calculation Steps:

1. Study the borehole log sheets & compare.

slide34

Bearing Capacity Analysis

2. Calculate unit skin friction (f ) for depth 5 to 11m.

3. Calculate design bearing capacity based on skin friction

(Factor of Safety = 3.0).

slide35

Bearing Capacity Analysis

4. Calculate ultimate bearing capacity of the soil at the tip of the pile (qtip).

5- Calculate design bearing capacity based on end bearing.

slide36

Bearing Capacity Analysis

6. Calculate total bearing capacity.

slide37

Conclusion

Summary.

Impact.

Thanks for your attention

slide38

Cost Estimation

  • Site clearance: 11,390 Dh.
  • Excavation and earthworks: 196,673 Dh.
  • Dewatering: 92,833 Dh.
  • Pilling: 494,222 Dh.
  • Reinforced poured concrete in substructure: 1,159,879 Dh.
  • Backfilling: 17,740 Dh.