Mozhgan Zareipour - Ph.D, Larestan branch, Islamic Azad University,Larestan, Iran
Akbar Ghanbari - Assistant Professor, Larestan branch, Islamic Azad University, Larestan, Iran

Bridge is a communication and transit route that today is considered as a special structure for its design, considering its importance and its application. One of the most important factors in its investigation is natural and abnormal factors. In this paper, it has been tried to evaluate two factors, including earthquake and fire, which are both natural and abnormal factors in concrete prestressed bridges. The characteristics of each one are investigated in these situations. Their results are used for constructive design in such bridges.

Earthquake, fire, Pre-stressed , Bridge