**Fluid Viscous Dampers and Shock Transmitters in the Realisation of Multi-Span Steel-Concrete Viaducts**

The chapter discusses the methodology for the dissipation of seismic energy, designed for the construction of a steel-concrete viaduct in a variable orography land. The viaduct has a total length of 1,102 m and a typical span of 75 m, with piers of a maximum height of 65 m. The viaduct is subjected to a redesign step in order to adapt it to the requirements of Italian standard "D.M. 14/01/2008". The new design has reformulated the sequence of spans and consequently redefined the structures constituting the foundations, piles, steel girders, infe‐ rior bracings and especially the typology of bearings and seismic devices.

## **Nondestructive Testing Structural Bridge Identification**

This final chapter presents the determination of bridge responses during their service life, which has gained great importance using non-destructive test methods with the change of aims, usage, environmental conditions, material deterioration by time and damages during certain dramatic events. In this chapter, non-destructive experimental measurement test re‐ sults of bridges are presented for structural identification. The measurements are conducted under environmental excitations of pedestrian movement, traffic and wind-induced vibra‐ tion, while the response signals are collected using uniaxial and triaxial sensitive seismic accelerometers.

To sum up, I would like to thank all authors for their dedication and willingness to contrib‐ ute to each chapter found in this book. I am also grateful to my coeditors, Associate Profes‐ sor Dr. Mohd Haziman Wan Ibrahim, Dr. Shahrul Niza Mokhatar, Dr. Norwati Jamaluddin, Dr. Noorwirdawati Ali and Dr. Zainorizuan Mohd Jaini, for their kind assistance in review‐ ing this book. All constructive criticisms and suggestions received have contributed im‐ mensely in the publication of this book.

> **Dr. Shahiron Shahidan** Universiti Tun Hussein Onn Malaysia, Jahor, Malaysia

#### **Chapter 1 Provisional chapter**
