Chapter 13: Arch bridges

This chapter considers the full range of arch bridge types and a range of materials, presenting several case studies and describing the design decisions that were made. A general treatment of the analysis of arches is presented, including the derivation of the basic equations that can be used to undertake hand calculations, which may be used to validate computer analysis output. Detailed arch bridge design is outside the scope of this chapter, so only general issues are discussed. Most of the chapter is devoted to masonry arch bridges. Masonry arch bridge construction is discussed in its historical context; the importance for engineers to take a holistic approach to bridge assessment and design is emphasised. There is a significant section on bridge assessment, which includes guidance on the application of current and emerging assessment methods. This is underpinned with background information regarding the material properties of masonry. The chapter concludes with a treatment of repair and maintenance strategies, including a table, listing common remedial and strengthening measures.