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About this book

This book explores the fundamentals of the elastic behaviour of erected precast segmental box girders (SBG) when subjected to static load, as well as the construction process (casting and erection work) involved. It analyzes and compares the experimental results with those obtained using the finite element method and theoretical calculations. A short-term deflection analysis for different loads is obtained by determining the maximum deflection, stress and strain value of single span precast SBG under a variety of transversal slope. The outcome of this work provides a better understanding of the behaviour of precast SBG in terms of structural responses as well as defects, so that maintenance work can then be focused on the critical section at mid span area specifically for the bridge project longitudinally and transversely. The book is of interest to industry professionals involved in conducting static load tests on bridges, and all researchers, designers, and engineers seeking to validate experimental work with numerical and analytical approaches.

Table of Contents


Chapter 1. Description of SBG Assembling and Casting-Penang Bridge

This chapter presents a brief description on precast segmental box girders technology of the longest South-East Asia Bridge in Penang, Malaysia followed by the construction process in terms of SBG Casting, SBG Transporting, and SBG Erecting. It highlights the importance of performing experimental static load test in construction of segmental bridges before it can be opened to the public. This chapter also notes the comparison between the period of assembly of the bridge superstructure to the cast-in-place construction.
Fadzli Mohamed Nazri, Mohd Azrulfitri Mohd Yusof, Moustafa Kassem

Chapter 2. Overview of Precast Segmental Box Girder

This chapter gives updates on the current work for segmental box girder (SBG) under static load test and the measurement to determine the elastic behavior, displacement, stress and strain of the SBG. Moreover, study on finite element analysis (FEA) and transversal slope on SBG is also highlighted in this chapter. At the end of this chapter, a summary of all experimental and analytical research of SBG previously conducted, is given.
Fadzli Mohamed Nazri, Mohd Azrulfitri Mohd Yusof, Moustafa Kassem

Chapter 3. Finite Element Analysis of SBG Subjected to Static Loads

This chapter describes the experimental and FEM in order to investigate the behaviour of erected precast (SBG) subjected to static load such as deflections, stresses and strains. The procedures and processes in conducting the FEM were acquired from experimental data on a selected span of the bridge. The methodology in this chapter is divided into 4 sections. Section 3.1 presents the material properties of the precast SBG. Section 3.2 describes load application operation and deck deflection monitoring. Section 3.3 explains the strain gauge instrumentation and data recording while Sect. 3.4 explains the parametric study on the models for a variety of transversal slopes using FEA.
Fadzli Mohamed Nazri, Mohd Azrulfitri Mohd Yusof, Moustafa Kassem

Chapter 4. Validation of Experimental and Analytical Study Work

In this chapter, the elastic behaviour and performance of precast segmental box girder (SBG) subjected to static load test is discussed based on the experimental results and finite element method (FEM). By using finite element analysis (FEA), stress and strain could be plotted in (a) graphs to produce stress-strain relationship. Based on the deflection formula, result from the FEA was compared with the calculation and the percentage of error was determined. Besides that, the comparison between the deflection behaviour of precast SBG with a variety of transversal slope or (so-called) crossfall gradient is also discussed in this chapter. A single span of precast SBG bridge model with constant span length, depth, thickness of top and bottom flange, width of top and bottom flange, thickness of web and few variables are tested for comparison of results. The variables are (a): Transversal slope (0, 2.0, 2.5 and 3.0%), and (b) Three types of load cases at HA-UDL (Load Case 1), HB 30 (Load Case 2) and HA-KEL (Load Case 3).
Fadzli Mohamed Mohamed Nazri, Mohd Azrulfitri Mohd Yusof, Moustafa Kassem
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