Concrete Bridges

Students will learn how to choose between the different types of bridges, estimate the construction depth and the different methods of constructions. Starting point is to describe the structures of the most common types of bridge.

Much attention will be paid to the historical development in prefabricated girders and concrete cross-sections cast in situ. The method of load distribution will be discussed in detail, as well as the design of expansion joints and the use of structural bearings. Special attention will be focused on bridges with long spans such as cable stayed bridges. Typical vibration problems are discussed. Finally, the use of high strength concrete and the effects on the design is explained. Two-thirds of the course consists of lectures, while the remaining one third is dedicated to case studies. These case studies deal with the various aspects that have to be acquired to complete this course. Students can choose to perform the case study individually or in pairs.

The following topics will be discussed:

• Bridge type and appearance

• Understanding of the type and behaviour of types of bridges

• Types of load. Traffic loads, load combination, temperature loads, impact loads based on the Dutch Code

• Development in prefabrication (precast beams). Beams and slab bridges

• Distribution of loads, method Guyon-Massonnet, influence lines and influence surfaces

• Design rules presented as depth/span-ratio

• Post-tensioning, cable alignment in-situ concrete

• Construction method; in-situ balanced cantilever construction; in-situ box girder construction on false work; incrementally launched box girder bridges; solid slab and voided slab

• Cable stayed bridges

• Application in high strength concrete

• Dynamic loads, vibrations

• Case study:

• Design and dimensioning of a prestressed concrete bridge and a cantilever bridge.