**The Structural Performance of Stone Masonry Bridges**

This chapter covers the performance of structural stone masonry bridges, which is examined by studying such structures located at the North-West area of Greece which have been de‐ clared as cultural heritage structures. The dynamic characteristics of four stone bridges, ob‐ tained by temporary in situ instrumentation, are presented together with the mechanical properties of their masonry constituents. The basic assumptions of relatively simple 3D nu‐ merical simulations of the dynamic response of such old stone bridges are discussed based on all selected information. The results of these numerical simulations are presented and compared with the measured response obtained from the in situ experimental campaigns.

## **Different Solutions for Dissipation of Seismic Energy on Multi-Span Bridges**

This chapter deals with the application of various methods for the dissipation of seismic en‐ ergy in order to adjust the response to seismic forces of an existing bridge with multiple spans.
