Life cycle cost analysis of non-structural infills including environmental and energy effects in seismic regions Alireza Fouladi alirezafooladi1373@gmail.com Date of Submission: 2020/4/12 Department of Civil Engineering Isfahan University of Technology, Isfahan 84156-83111, Iran Degree: M.Sc. Language: Farsi Supervisor: Dr. Payam Asadi, Asadi@cc.iut.ac.ir Generally, engineering design process is aimed at providing an economical case along with considering the design criteria. The life-cycle cost analysis known as an appropriate tool assessing the structural performance has been exploited to provide a stable design in the case of expecting a long serviceability longevity. In order to build an environmentally-conscious building, the environmental impacts of the entire service life must be taken into account. The analysis of life-cycle is feasible to be conducted through the assessment of structure energy consumption and the carbon produced by energy consumption as one of the main environmental hazards. Throughout the present study, the life-cycle assessment for the construction stages and the operation period for three special steel moment frame buildings considering intermediates subjected to three different seismic hazard levels has been performed. Since the incremental dynamic analysis (IDA) is defined as a method that can be hired to satisfy the seismic capacity of a structure under different possible earthquake stimulation intensities, it has been included in the life-cycle cost analysis. More to present study, life-cycle cost considering the probabilities related to different hazard levels has been examined in terms of components' cost, environmental cost and social cost. According to the model obtained from the analysis results of 9 frames modeled once with an infill and once without it, under 11 earthquake records and with the help of incremental dynamic analysis, the optimal state was obtained by observing the design criteria. The most important environmental costs of this study include the cost of air pollutants, the potential of global warming, fossil fuel depletion, water intake and human health. It is noteworthy to state that the environmental effects are also assessed by assigning a score. In order to perform the analysis, firstly, various functions of the inter-story drift, the floor maximum acceleration, and loss cost have been directly or indirectly derived. This research highlights the importance of considering the environmental aspects of structures. Moreover, the findings indicate the significant contribution of energy in the first place and social and environmental aspects in the second place in the life-cycle costs. In general, as elaborated in this study, during a 50-year average life-cycle of a building, between 75 and 80% of the total costs include energy life cycle costs, which reaches 1 to 4% for environmental costs and 1 to 2% for social costs. The presence of the infill in a 4-story structure increases 1649.6 kg of carbon dioxide equivalent in the life cycle of the building, which is equal to 3992.2 kg for the 8-story structure and 4948.8 kg for the 12-story structure. Also, as for the reduction effect of the interlayers on the drift of structures in 4 and 8-story structures is determined more than 12-storey building. Keywords Life cycle analysis, incremental dynamic analysis, loss analysis, environmental cost, energy cost