Stochastic assessment of nigerian timbers for bridge decks in accordance to aashto lfrd
Table Of Contents
Chapter ONE
INTRODUCTION
- 1.1Introduction
- 1.2Background of Study
- 1.3Problem Statement
- 1.4Objective of Study
- 1.5Limitation of Study
- 1.6Scope of Study
- 1.7Significance of Study
- 1.8Structure of the Research
- 1.9Definition of Terms
Chapter TWO
LITERATURE REVIEW
- 2.1Overview of Timber as a Bridge Deck Material
- 2.2Historical Perspective on Timber Bridge Decks
- 2.3AASHTO LRFD Specifications for Bridge Decks
- 2.4Strength and Durability of Timber in Bridge Construction
- 2.5Environmental Impact of Timber Bridge Decks
- 2.6Maintenance and Rehabilitation of Timber Bridge Decks
- 2.7Case Studies of Timber Bridge Deck Applications
- 2.8Comparative Analysis with Other Deck Materials
- 2.9Emerging Trends in Timber Bridge Deck Design
- 2.10Future Prospects for Timber Bridge Decks
Chapter THREE
SYSTEM DESIGN AND IMPLEMENTATION
- 3.1Research Methodology Overview
- 3.2Selection Criteria for Timber Samples
- 3.3Testing Procedures for Timber Strength
- 3.4Data Collection and Analysis Methods
- 3.5Experimental Setup for Timber Assessment
- 3.6Statistical Analysis Techniques Employed
- 3.7Quality Control Measures in Research
- 3.8Ethical Considerations in Timber Testing
Chapter FOUR
SYSTEM TESTING AND EVALUATION
- 4.1Analysis of Timber Strength Characteristics
- 4.2Comparison with AASHTO LRFD Requirements
- 4.3Evaluation of Timber Durability Factors
- 4.4Impact of Environmental Conditions on Timber
- 4.5Maintenance Challenges and Solutions
- 4.6Case Studies on Timber Bridge Deck Performance
- 4.7Recommendations for Timber Deck Design
- 4.8Future Research Directions
Chapter FIVE
SUMMARY, CONCLUSION AND RECOMMENDATIONS
- 5.1Summary of Findings
- 5.2Conclusion and Insights
- 5.3Implications for Bridge Deck Design
- 5.4Contributions to Timber Engineering
- 5.5Recommendations for Practice
- 5.6Areas for Future Research
Thesis Abstract
This work provides results for stochastic safetyevaluation of Nigerian timbers for bridge decks in accordance to American Association of State Transportation and Highway Officials (AASHTO) Load Resistance Factored Design (LRFD) design specifications.A timber bridge is modeled in accordance to AASHTO LRFD, 2010, to represent real life experiment in order to depict the structural behavior of planks when used as a bridge deck. This model was then subjected to some degree of entropy using Advanced Second Moment Reliability Assessment (ASMRA) method, which was subsequently analysed using JAVA library with the help of Flanagan polynomial.Experimental data collected from literature was comparedwith the current Nigerian Code of Practice, NCP 2, 1973 for timber, and were used for the assessment. It was observed that, strength classes, timber thicknesses and stringer spacing are the major factors among others influencing the structural behavior of Nigerian timber proposed as bridge decks. Therefore, the major classes of Nigerian timber recommended for bridge decks are timber within the strength classes N1 to N4 with dimensions ranging from 100 x 250mm to 150 x 300mm on stringers spaced not greater than 300mm, depending on the strength class adopted; with timber belonging to the higher strength classes taking the lower dimension. An exception to this, are timber which belong to the strength class N1, where the stringers can be spaced at 450mm using timber with dimension not lower then 100mm thick and width not less than 250mm.The recommended strength classes with associated material properties can be a source of sustainable bridge deck material over a reasonable period of time as indicated by the probability of failure as a result of damage due to load accumulation. In view of this, timber which is a locally available material can be used as substitute for the expensive concrete and steel which are the most commonly used materials.
Thesis Overview
<p> </p><p><strong>INTRODUCTION</strong></p><p><strong>1.1 </strong><strong>GENERAL OVER VIEW</strong></p><p>The need for local content in construction of engineering infrastructure is now a serious engineering challenge in Nigeria. This is because vast quantities of local raw materials, which must be processed and used for cost effective construction abound. Construction activities based on these locally available raw materials are major steps towards industrialisation and economic independence for developing countries (Aguwa and Sadiku, 2011).</p><p>Timber is one of the natural occurring raw materials which abound in Nigeria and it had been put to use as a building material for construction since prehistoric times. It is available inlarge quantities in the forested parts of the country. The extent of its usage by professionals in the buildingindustry is determined not only by their understanding of the material, but also by their perception of thematerial (Adedeji and Ogunsote, 2004).</p><p>The major use of timber in Nigeria and most part of the third world has been limited to domestic use as an alternative source of heat energy or household kitchen appliance. In this respect, timber which is supposed to be used to sustain the development of the economy is been burnt as coal. With critical analysis of our environment and careful exploration of the structural properties of timber, one can adequately establish and design an environmentally friendly structure which is cost effective.</p> <br><p></p>Blazingprojects Mobile App
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