FIRE RESISTANCE

Fire Resistance of High Strength Concrete Columns

Table Of Contents

CHAPTER I5

1. Introduction5

1.1. Purpose of Study:6

1.2.Objective7

1.3. Research Questions7

CHAPTER II8

2. Literature Review8

2.1 Fire Resistance Studies On Hsc10

2.2 Fire Resistance Design of HSC Columns 9511

2.3 Behavior of HSC Columns12

2.4 Factors Governing Fire Performance16

2.4.1. Fire characteristics17

2.4.2 Material characteristics18

2.5 Concrete Strength19

2.6. Silica fume19

2.7 Concrete Moisture Content20

2.8 Concrete Density20

2.9 Fire Intensity21

2.10 Specimen Dimensions21

2.11 Lateral Reinforcement22

2.12 Fiber Reinforcement23

2.13 Load Intensity and Type24

2.14 Type of Aggregate24

2.15 Guidelines For Enhancing Fire Performance25

CHAPTER III28

3. Methodology28

3.1. Column Specimens28

3.2. Experimental Set-up29

3.3. Experimental Procedure30

3.4. High and normal strength concrete mixes35

3.5. Test methodology and measured parameters36

3.6. Spalling assessment37

3.7. Loading only tests under high temperatures38

3.8. Tests on restrained columns38

CHAPTER IV41

4. Results and Discussion41

4.1. Effect of loading level on generated forces48

4.2. Effect of restraint degree on force generation48

4.3. Comparison between HSC and NSC behaviour50

4.4. Preventing explosive spalling using polypropylene fibers52

5. Fire Endurance of HSC Columns53

5.1. Effect of Concrete Strength53

5.2. Effect of Lateral Reinforcement53

5.3. Effect of Load Intensity54

5.4. Effect of Aggregate Type54

6. Computer implementation55

6.1. Computer program56

6.2. Idealisation56

6.3. Material properties59

6.3.1. Concrete59

6.3.2. Steel reinforcement59

6.4. Input description60

6.5. Output results60

7. Current Research61

CHAPTER V62

8. Conclusion62

References67

CHAPTER I

1. Introduction

In latest years, the building commerce has shown important concern in the use of high power solid (HSC).This is due to the improvements in functional presentation, for example high power and durability, that it can supply in evaluation to customary usual power solid (NSC).The use of HSC, which was mostly in submissions for example connections, offshore organizations, and infrastructure tasks, is evolving more well liked in high-rise buildings. One of the foremost values of HSC in structures is for columns.

The expanded use of HSC has increased anxieties considering the demeanor of such concretes in fire. In specific, the incident of spalling (often explosive) at increased temperatures when HSC is exposed to fast heating scheme, as in the case of a blaze, is one of the causes for this anxiety .Further, outcomes of blaze checks in several laboratories (Kodur 217-232) (Danielsen 56-76) (Bilodeau 71-296) (Hertz 103-116) have shown that there are well-defined dissimilarities between the properties of HSC and NSC at increased temperatures. However, numerous of these investigations were attempted on small-scale specimens, and furthermore under hydrocarbon blaze exposures which is distinct from benchmark construction blaze exposures.

Studies are in advancement at the National Research Council of Canada (NRC), in joint project with the Portland Cement Association (PCA), and the Cement Association of Canada (CAC), to evolve blaze opposition conceives guidelines for the use of HSC, and for likely incorporation in ciphers and measures. The major target of this study is to work out the demeanor of full-scale HSC functional pillars under benchmark construction blaze exposures, and to assess its blaze endurance. As part of untested investigations, full-scale blaze endurance checks on HSC pillars were undertook, and the outcomes from these trials are offered in this paper.

1.1. Purpose of Study:

The aim of the study to identify the main differences between the behavior of HSC and NSC under fire and to check whether the provisions added to Eurocode-2 are sufficient to ensure adequate fire resistance of HSC ...