Sharif Digital Repository

Continuous increase of energy demand, scarcity of resources, as well as environmental limitations have led to the need to reduce carbon emissions. In this research, an MINLP model based on the mathematical optimization formulation is proposed to reach this issue in a large cogeneration unit. Advantage of the hierarchical approach for carbon management are avoiding individual carbon reduction policies, and embedding emission control techniques in a hierarchical mathematical model that helps us to select the most appropriate policies and prioritize each other. In the carbon management hierarchy, the optimization of the base cycle is done at the first stage. Then, the use of renewable energies... 

The aim of this research is to evaluate and compare the performance of common concrete and steel structural systems in the construction industry under various parameters, including initial construction cost, lifetime seismic losses, end-of-life costs of the structure, and simultaneous consideration of these parameters. In this regard, a residential building with real architectural plans and details was designed for five different structural systems, both concrete and steel, and their initial construction costs were calculated using executive drawings. Then, using Endurance Time dynamic analysis, the structural responses under probable seismic hazard levels was determined, and based on... 

The objective of this study is to design a real structure based on value using the endurance time method, which is designed according to common design codes. In the value-based design of this structure, a variation of the lateral load coefficient has been used for the design of the investigated structural specimens. The term "value" in this research refers to the total costs incurred over the lifespan of the structure. The initial construction costs of the structure and the life cycle costs are optimized in the value-based design process. The initial construction cost in this research consists of two parts: the first part is variable costs that arise from the consumed materials in the... 

The construction industry is one of the important and driving sectors of every country's economy, and construction projects are one of the economic development factors of countries. These plans lead to economic growth and development through the mobility they create in public and private capital. Every year, a significant share of the government budget is spent on the implementation of public construction projects. Due to the key role of public construction projects in the development of the country on the one hand and spending huge national funds on the other hand, it is important to pay attention to their efficiency and productivity. Excess costs of public construction projects and delays... 

The sustainability of urban infrastructure is assessed in three integral economic, social, and environmental dimensions. This study focuses on advancing a design approach based on value through the optimization of the life-cycle cost of steel moment frames, considering sustainability indicators by utilizing endurance time method analysis.In this path, the dimensional specifications of steel frame sections are selected optimally using an automated process with the objective of minimizing the cost of the structure's life cycle as the objective function and code specifications as optimization constraints. The cost of the life cycle, includes material extraction and production, transportation,... 

The main purpose of this research is to evaluate the impact of mainshock and aftershocks on the response and fragility of power transmission towers and to provide an approach to assess the risk of transmission lines under mainshock-aftershock sequence. The transmission line studied in this research has 27 self-supported 400 kV transmission towers. The reason for choosing this line is the proximity of the line to the active faults of Tehran like Mosha and North-Tehran, as well as the service of the line to a large residential and industrial area, which, in case of damage by an earthquake, will cause considerable direct and indirect loss to the society. In the three-dimensional models... 

This dissertation proposes a probabilistic framework for optimal calibration of design provisions based on the minimization of lifecycle cost (LCC) and its uncertainty. Subsequently, this framework is utilized to determine the optimal robust design base shear coefficient of building structures, and propose a methodology for codifying it while preserving the current structure of the base shear equation. In the first part of the proposed methodology, various structures are designed with different seismic base shears. Then, at each site, their LCC comprising the construction costs and seismic losses is calculated. Various types of seismic loss considered in this study include the direct... 

This study proposes an efficient risk-targeted framework for integrated optimal seismic design and quantifying target safety of steel Special Moment-Resisting Frames (steel SMRFs) with and without various passive damping devices such as Buckling-Restrained Braces (BRBs), Friction Dampers (FDs), and Fluid Viscous Dampers (FVDs). This framework provides an automated design procedure formulated as a constrained single-objective optimization problem to achieve the minimum Life Cycle Cost (LCC) within the Particle Swarm Optimization (PSO) algorithm and can be the basis of current seismic codes for target safety calibration. LCC includes initial construction cost and lifetime seismic losses such... 

With the road transportation vehicles being widely used, concerns have been increased regarding their unwanted effects. Air pollution, climate change, and oil supply security are among these effects. Many alternative fuels and propulsion systems have been proposed to be used instead of conventional ICE vehicles in recent decades. This project intends to conduct a Techno-Economic comparison between different vehicle powertrains so as to select the suitable choice to substitute conventional ICE vehicles. The vehicle options are ICE vehicles using both gasoline and CNG as fuels, Hybrid Electric Vehicles (HEVs), Plug-in Hybrid Electric Vehicles (PHEVs), and Electric Vehicles (EVs). The amount of...