The aim of any engineering design is to minimize the total cost of the structure without neglecting design criteria. The life cycle cost analysis provides engineers and clients with the opportunity to achieve the most economically and environmentally efficient design through a comprehensive analysis of the structure in various aspects. This analysis has been utilized for eva‎luating the behavior of structures against earthquakes and developing improvement and strengthening strategies. The Incremental Dynamic Analysis (IDA) has been employed to estimate the seismic capacity of a structure under different earthquake intensity levels. In the present study, the life cycle cost assessment has been conducted for three-dimensional reinforced concrete frames with residential use under seismic risk. Initially, the initial design of 4, 8, and 12-story structures was carried out in three dimensions based on ACI 318-19 standards. Subsequently, the modeling of these structures was performed nonlinearly using the OpenSEES software. The life cycle cost, considering fundamental parameters such as hardness, resistance, and ductility from economic, environmental, and social cost aspects, has been investigated. The obtained pattern of results from the analysis of twenty-four frames of 4, 8, and 12 stories under 11 pairs of earthquake accelerograms using IDA has been utilized to determine the optimal state while adhering to design criteria. Among the most significant environmental costs in this research are air pollution, land warming potential, and human health. Social costs include rent, injuries, and human mortality during an earthquake event. The study has highlighted the importance of each fundamental parameter and emphasized the environmental aspects of a structure. Finally, an optimal function for calculating the life cycle cost, considering the inflation coefficient for different structures, has been derived. The cost calculation functions for average and special structures have been separately fitted. The functions regarding the earthquake coefficient corresponding to the seismic hazard intensity of the region, structural resistance, period of vibration corresponding to hardness, and the area of the structure corresponding to its size have been obtained. The results indicate a significant impact of social damage cost calculation on the final life cycle cost, with environmental and implementation costs also having nearly equal effects. The fitting results show that the life cycle cost has an inverse relationship with the earthquake coefficient and a direct relationship with the period of structure and the structure's size.

پيام اسدي

مرتضي مدح خوان , مريم داعي