en @ DEVELOPMENT OF OPTIMAL MODELS FORBRIDGE MANAGEMENT SYSTEM Research Paper Research Paper In this paper, optimal bridge management system models have been presented. These optimization models are capable of allocating limited resources to the bridge preservation schemes in order to establish the optimal time of completing the activities. Bridge-based activities are divided into two main groups: repair projects, and maintenance activities and both models are presented in this paper. Particular attention has been made to optimize the management of the two system activities. The dynamic programming approach was utilized to formulate and analyze the two models. The developed models are found to be more accurate and faster than the previous ones. repair and Maintenance, Bridge, Optimization Model 54 61 http://ijce.iust.ac.ir/browse.php?a_code=A-10-112-2&slc_lang=en&sid=1 SAFFAR ZADEH M. 180031947532846005821 180031947532846005821 Yes KARBASI ZADEH B. 180031947532846005822 180031947532846005822 No