Riprap protection and failure mechanisms at bridge piers.
Lim, Foo Hoat.
Date of Issue1998
School of Civil and Environmental Engineering
The main objectives of this thesis are to study the failure mechanisms of a riprap layer around a bridge pier, and to identify the characteristic parameters affecting riprap failure. The thesis consists of seven chapters. Chapter 1 introduces the background of pier scour problems, the necessity of research on riprap protection around bridge piers, and the aim and scope of the study. Chapter 2 reviews previous works on local scour and riprap protection around bridge piers. Chapter 3 provides the details of the experimental equipment and procedures of the study. Two series of experiments were conducted under both clear-water and live-bed conditions, with special emphasis on latter condition. The aim of the first series was to study the formation of the maximum scour depth in the absence of a riprap layer. The results were used as a basis for evaluating the performance of the riprap layer. The second series was to study the effect of a riprap layer placed around the pier on scouring. The latter series consisted of three main parts, and the results are presented and discussed in Chapters 4, 5 and 6, respectively.
DRNTU::Engineering::Civil engineering::Structures and design