en مدل های شبیه سازی و احتمالی Simulation & Stochastic Models پژوهشي Research Allocation of construction risks between clients and their contractors has a significant impact on the total construction costs. This paper presents a system dynamics (SD)-based approach for quantitative risk allocation. Using the proposed SD based approach, all the factors affecting the risk allocation process are modeled. The contractor’s defensive strategies against the one-sided risk allocation are simulated using governing feedback loops. The full-impact of different risk allocation strategies may efficiently be modeled, simulated and quantified in terms of time and cost by the proposed object-oriented simulation methodology. The project cost is simulated at different percentages of risk allocation and the optimum percentage of risk allocation is determined as a point in which the project cost is minimized. To evaluate the performance of the proposed method, it has been implemented in a pipe-line project. The optimal risk allocation strategy is determined for the inflation risk as one of the most important identified risks. Modeling, risk allocation, simulation, system dynamics 237 246 http://ijiepr.iust.ac.ir/browse.php?a_code=A-10-355-1&slc_lang=en&sid=1 Mostafa Khanzadi khanzadi@iust.ac.ir 180031947532846003194 180031947532846003194 Yes Assistant Professor Farnad Nasirzadeh f.nasirzadeh@gmail.com 180031947532846003195 180031947532846003195 No Assistant Professor Mahdi Rezaie mahdirezaie@gmail.com 180031947532846003196 180031947532846003196 No M.Sc student