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Iranian Household Saving Behavior
, M.Sc. Thesis Sharif University of Technology ; Souri, Davood (Supervisor)
Abstract
This paper decomposes the saving rate into cohort, age and year effects. This objective is accomplished by constructing a pseudo-panel that amalgamates nineteen consecutive, cross-sectional Household Income and Expenditure Surveys from 1991 to 2009. To construct year-of-birth cohorts with consistent composition over time, analyses are limited to those born between 1926 and 1975. Results reveal that those belonging to younger cohorts save a higher fraction of their income relative to their predecessors at the same age. Moreover, the increase in the saving rate can not be explained by the significant decline in household size or rise in educational attainment among younger cohorts. Closer...
Development and Application of a Model for Assessing the Sustainability of Energy supply System
, M.Sc. Thesis Sharif University of Technology ; Saboohi, Yadollah (Supervisor)
Abstract
Depletion of fossil energy reserves and rapid growth of energy demand have been challenging issues in the energy sector. Proper solution of these issues requires development of an integrated and comprehensive approaches. Such conceptual framework could provide an appropriate means for studying energy problems and anlysing the development of efficient technologies which could improve the economic viability and reduce the impact of energy system on the environmental. Therefore, analytical tools need to be developed further and they could be applied for systematic analysis of impact of new energy technologies on the economical efficiency and environmental compatibility of energy...
Endurance time analysis of skewed slab-on-girder bridges: The significance of the excitation angle
, Article Scientia Iranica ; Volume 26, Issue 4A , 2019 , Pages 2276-2285 ; 10263098 (ISSN) ; Ghaffari, E ; Haghani Baei, A ; Sharif University of Technology
Sharif University of Technology
2019
Abstract
In this paper, the influence of the excitation angle on the Endurance Time (TCT) analysis of skewed slab-on-girdcr bridges is studied. The excitation of the structure due to the critical angle produces maximum seismic responses that are sometimes significantly higher than the average. The modeled bridges are of slab-on-girder type that are typically used as highway bridges. The bridge models have skew angles of 0, 15, 30, 45, and CO degrees. The ET excitations exerted on structures cover a broad range of hazard levels. The results provide some insight with regard to choosing multiple excitation angles so as to balance computational costs and retain acceptable accuracy for practical design...
Endurance time analysis of skewed slab-on-girder bridges: the significance of the excitation angle
, Article Scientia Iranica ; Volume 26, Issue 4A , 2019 , Pages 2276-2285 ; 10263098 (ISSN) ; Ghaffari, E ; Haghani Baei, A ; Sharif University of Technology
Sharif University of Technology
2019
Abstract
In this paper, the influence of the excitation angle on the Endurance Time (TCT) analysis of skewed slab-on-girdcr bridges is studied. The excitation of the structure due to the critical angle produces maximum seismic responses that are sometimes significantly higher than the average. The modeled bridges are of slab-on-girder type that are typically used as highway bridges. The bridge models have skew angles of 0, 15, 30, 45, and CO degrees. The ET excitations exerted on structures cover a broad range of hazard levels. The results provide some insight with regard to choosing multiple excitation angles so as to balance computational costs and retain acceptable accuracy for practical design...
Emission assessment of alternative dam structure types, a novel approach to consider in new dam projects
, Article Construction Innovation ; 2020 ; Bajalan, Z ; Iravani, P ; Sharif University of Technology
Emerald Group Publishing Ltd
2020
Abstract
Purpose: Dams require high-volume of construction materials and operations over the life cycle. This paper aims to select a proper type of dam structure that can significantly contribute to the sustainability of dam projects. Design/methodology/approach: This research proposes a complementary fuel consumption and carbon dioxide (CO2) emission assessment method for the alternate dam structure types to assist decision-makers in selecting sustainable choices. Related equations are developed for two common earthen and rock-fill dam structures types in Iran. These equations are then successfully applied to two real dam project cases where the significance of the achieved results are assessed and...
BIM-based approach to conduct Life Cycle Cost Analysis of resilient buildings at the conceptual stage
, Article Automation in Construction ; Volume 123 , 2021 ; 09265805 (ISSN) ; Jalaei, F ; Golpour, A ; Hosseini Varzande, S. S ; Guest, G ; Sharif University of Technology
Elsevier B.V
2021
Abstract
All costs within the life cycle of a building are known as its life cycle cost (LCC). In the design process of a building, the use of a lower initial cost index to select an option among others with similar performance may not lead to an economically optimal alternative during the life cycle. Hence, today, building designers and investors require a tool to estimate life cycle cost at the conceptual design stage to select an economically efficient option. Resilient solutions generally lead to a higher level of complexity and upfront costs and carry additional embodied environmental impact as well. This study aims to support the design of resilient buildings using a sound LCC methodology in...
Comparative Study of Life Cycle Cost of Steel and Concrete Building Systems Designed Based on Standard 2800 by Endurance Time Method
, M.Sc. Thesis Sharif University of Technology ; Esmaeil Pourestekanchi, Homayun (Supervisor)
Abstract
The actual value of structures should not be evaluated only based on initial cost, because failure cost and economical losses due to corrosion and natural hazards can be catastrophic. The aim of this research is Comparative study of life cycle cost of steel and concrete building systems designed based on standard 2800 by Endurance Time Method. These costs include initial cost and life cycle cost Due to the aftermath of the earthquake in the life of the structure. In this research, because it requires a lot nonlinear dynamic time history analysis, Endurance Time Method used which is both good accuracy and also drastically reduces the cost of computing-off. Selected models for the study, four,...
Sustainability Assessment of Perpetual Pavements Using Mechanistic-Empirical Approach
, M.Sc. Thesis Sharif University of Technology ; Tabatabaee, Nader (Supervisor) ; Sabouri, Mohammad Reza (Supervisor)
Abstract
Pavements are essential part of transportation infrastructures that are expensive to build and maintain and could significantly affect the environment. In recent decades, global warming has become a major concern. Therefore, in pavement design in addition to the economic and environmental considerations, conformity with sustainable development have received attention. In the past decades in Iran, because of the low production and high price of cement, and availability of inexpensive bitumen, flexible pavements were the predominant type. However, the increased price of bitumen in the past two decades has changed the balance of the highway construction projects, and bitumen procurement has...
An efficient method for workpiece locating error prediction in machining process
, Article SAE 2016 World Congress and Exhibition, 12 April 2016 through 14 April 2016 ; Volume 2016-April , April , 2016 ; Sharif University of Technology
SAE International
Abstract
Fixtures play a key role in locating workpieces to manufacture high quality products within many processes of the product lifecycle. Inaccuracies in workpiece location lead to errors in position and orientation of machined features on the workpiece, and strongly affect the assemblability and the final quality of the product. The accurate positioning of workpiece on a fixture is influenced by rigid body displacements and rotations of the workpiece. In this paper, a systematic approach is introduced to investigate the located workpiece position errors. A new mathematical formulation of fixture locators modeling is proposed to establish the relationship between the workpiece position error and...
The role of energy subsidy reform in energy efficiency enhancement: lessons learnt and future potential for iranian industries
, Article Journal of Cleaner Production ; Volume 197 , 2018 , Pages 542-550 ; 09596526 (ISSN) ; Fakouriyan, S ; Sheykhha, S ; Sharif University of Technology
Abstract
Significant energy subsidies are believed to be the main factor that has resulted in high energy intensities of Iranian industries. The Subsidy Reform Act of 2010 was directed at modifying energy consumption pattern and fostering energy efficiency enhancement. This study aims at analyzing the effect of energy subsidy reform on promoting energy efficiency in six energy intensive industries of Iran. In order to do so, the energy efficiency practices that have not been adopted after the implementation of the first phase of energy subsidy reform are investigated. Data analysis reveals that if financially interesting investments are determined as those with payback periods less than three years,...
Multi objective planning for sustainable retrofit of educational buildings
, Article Journal of Building Engineering ; Volume 24 , 2019 ; 23527102 (ISSN) ; Aramoun, F ; Bararzadeh, M ; Avami, A ; Sharif University of Technology
Elsevier Ltd
2019
Abstract
The sustainable retrofit options may significantly improve the energy consumption and the environmental impacts of the existing buildings. This paper presents a multi objective optimization framework to reach the minimum economic costs and Global Warming Potential (GWP) impact of existing buildings. New energy-efficient technologies for the supply side of the energy system are considered which may minimize life cycle environmental impacts of buildings. Two educational buildings in the campus of Sharif University of Technology are studied. The results show that utilizing reciprocating engine and exhaust-fired absorption chiller reduce the GWP to 133 tons (17.79% of reduction) and 190 tones...
A comprehensive comparative investigation on solar heating and cooling technologies from a thermo-economic viewpoint—A dynamic simulation
, Article Energy Science and Engineering ; Volume 9, Issue 5 , 2021 , Pages 724-742 ; 20500505 (ISSN) ; Behnam, P ; Abbasi Kamazani, M ; Mohammadi, O ; Kavian, S ; Ahmadi, P ; Rosen, M. A ; Sharif University of Technology
John Wiley and Sons Ltd
2021
Abstract
The yearly thermo-economic performance is dynamically investigated for three solar heating and cooling systems: solar heating and absorption cooling (SHAC), solar heating and ejector cooling (SHEC), and heating and solar vapor compression cooling (HSVC). First, the effects of important design parameters on the thermo-economic performance of the systems to supply the heating and cooling loads of the building are evaluated. The systems are parametrically analyzed with the weather conditions of Tehran, Iran. The results show that the life cycle costs (LCC) of the SHAC and HSVC systems are alike and much lower than those of the SHEC system. The HSVC system exhibits the best performance from...
Emission assessment of alternative dam structure types, a novel approach to consider in new dam projects
, Article Construction Innovation ; Volume 21, Issue 2 , 2021 , Pages 203-217 ; 14714175 (ISSN) ; Bajalan, Z ; Iravani, P ; Sharif University of Technology
Emerald Group Holdings Ltd
2021
Abstract
Purpose: Dams require high-volume of construction materials and operations over the life cycle. This paper aims to select a proper type of dam structure that can significantly contribute to the sustainability of dam projects. Design/methodology/approach: This research proposes a complementary fuel consumption and carbon dioxide (CO2) emission assessment method for the alternate dam structure types to assist decision-makers in selecting sustainable choices. Related equations are developed for two common earthen and rock-fill dam structures types in Iran. These equations are then successfully applied to two real dam project cases where the significance of the achieved results are assessed and...
, M.Sc. Thesis Sharif University of Technology ; Alvanchi, Amin (Supervisor)
Abstract
Limited water resources in Iran have made dams an important part of the country’s infrastructure. As a result of the large number of in-progress and expected dam projects in the country, consideration of sustainability factors during planning, construction and operation phases of dam projects can create significant economical, social and environmental impacts in the long term. To come up with an inclusive sustainable development, new sustainability assessment approaches seek for sustainable development at the entire project’s life-cycle; they are looking for sustainable development at all design, construction, operation, maintenance and even demolition phases. In this research we have...
Development of an Integrated Solar Energy System for a Typical Educational Building
, M.Sc. Thesis Sharif University of Technology ; Saboohi, Yadollah (Supervisor)
Abstract
In the present thesis, A Computer software has been developed to evaluate technical and economic aspects of photovoltaic systems, off-grid and on-grid configuration, in urban areas where the electricity grid is accessible. As a case study the building of Energy Engineering faculty with annual demand of electricity in lighting section equals to 80048 kWh was considered. Regarding incident radiation and PV system characteristics with the aid of utilizability concept, a technical evaluation has been performed then life-cycle saving index was considered as a criterion for choosing an optimum nominal size of the system. Results show that for current electricity tariff of educational buildings ...
A framework for estimation of complexity in agent oriented methodologies
, Article 7th IEEE/ACS International Conference on Computer Systems and Applications, AICCSA-2009, Rabat, 10 May 2009 through 13 May 2009 ; 2009 , Pages 645-652 ; 9781424438068 (ISBN) ; Taghiyareh, F ; Alinaghi, T ; Ghoroghi, C ; Moallem, A ; Sharif University of Technology
2009
Abstract
Agent-oriented software methodologies have found their way to become one of the most important issues of software development. The diversity of existing methodologies and the variety of newly arriving ones have arisen the question of which methodology is best in the context of a special problem, so the need for evaluating and comparing methodologies is becoming more important everyday. On the other hand evaluating methodologies can reveal their strengths and shortcomings which lead to an improvement in development of the next generation of agent-oriented methodologies. In this paper, we are going to introduce an approach for evaluating methodologies via the evaluation of their lifecycle...
Lifetime oriented multi-objective cost optimization of structural maintenance considering the safety of the system
, Article Proceedings, Annual Conference - Canadian Society for Civil Engineering, 28 May 2014 through 31 May 2014 ; Volume 1 , May , 2015 , Pages 656-663 ; 9781510818781 (ISBN) ; Nasserl, M ; Tavakolan, M ; Sharif University of Technology
Canadian Society for Civil Engineering
2015
Abstract
Nowadays the maintenance of the deteriorating structures is an important subject in industry and research. Due to the limitations of the budget and time, the optimization algorithms have been used widely to determine the best maintenance strategies to provide the more economical structures. On the other side, the Less life-cycle cost will result in less safe structures. As safety is a vital criterion for the users of a structural system, there is a severe need to make a suitable trade-off between cost and safety. So, the optimal maintenance strategies are those that fulfill both the safety and the economical requirements. In this paper, the reliability of the structural system is selected to...
Extended energy return on investment of multiproduct energy systems
, Article Energy ; Volume 192 , 2020 ; Khajehpour, H ; Saboohi, Y ; Sharif University of Technology
Elsevier Ltd
2020
Abstract
Energy Return on Investment (EROI) is an indicator of how efficient is an energy supply system. In the present study, the conventional approach of EROI assessment is extended to include the equivalent energy investment needed for offsetting the life cycle environmental impacts. Moreover, the issue of allocation of the invested energy among different by-products is addressed. The EROI of multiple products has been specified using different benchmarks of price, energy content, exergy content, and exergy costs. The application of the concept is demonstrated through a case study of an Iranian oil production unit. The overall conventional and environmentally-extended EROI values of the produced...
Economic and environmental evaluation of different operation alternatives to aquifer thermal energy storage in Tehran, Iran
, Article Scientia Iranica ; Volume 24, Issue 2 , 2017 , Pages 610-623 ; 10263098 (ISSN) ; Bahadori, M. N ; Saidi, M. H ; Sharif University of Technology
Sharif University of Technology
2017
Abstract
Aquifers are underground porous formations containing water. Confined aquifers are surrounded by impermeable layers on top and bottom, called cap rocks and bed rocks. A confined aquifer with a very low groundwater flow velocity was considered to meet the annual cooling and heating energy requirements of a residential building complex in Tehran, Iran. Three different alternatives of Aquifer Thermal Energy Storage (ATES) were employed to meet the heating/cooling demands of the buildings. These alternatives were using ATES for: Cooling alone, heating alone by coupling with at-plate solar collectors, and cooling and heating by coupling with a heat pump. For the economic evaluation of the...
Seismic damage and life cycle cost assessment of unanchored brick masonry veneers
, Article Engineering Structures ; Volume 260 , 2022 ; 01410296 (ISSN) ; Ghahremani Baghmisheh, A ; Estekanchi, H. E ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
This paper develops the seismic damage models of brick masonry veneer attached to the masonry infill without metal ties and assesses the life cycle cost of veneers subjected to earthquake excitation. Even though anchoring veneers to the backup wall has been prescribed in recent building codes, most of the existing brick veneers in seismic prone areas around the world lack the anchoring details. Besides, the damage and consequence models of masonry façades have not been presented in the FEMA-P58 database restricting detailed performance evaluation of buildings with unanchored masonry veneers. This study develops detailed finite element models to simulate various failure modes of the masonry...