Evaluating the Effect of Stability Control on Progressive Collapse of Structures with EBF Systems
seyedmohammad
hosseini
PhD student of structural engineering, Faculty of Civil Engineering, Shahid Rajaee Teacher Training University, Lavizan, Tehran, IRI
author
Gholamreza
Ghodrati Amiri
Professor, Center of Excellence for Fundamental Studies in Structural Engineering, School of Civil Engineering Iran University of Science & Technology
author
text
article
2018
per
According to prevalent use of Eccentrically Braced Frames (EBF) systems in seismic regions and occurrenceof progressive collapse phenomenon, it is necessary to study potential of structures against progressive collapse. In this paper, the potential of progressive collapse in structures with EBF systems and effect of stability control on structures are investigated. Therefore, consequences of applying different elimination scenarios through desired values provided significantly. So, in the beginning, three '3, 5, and 8' -story structures were modeled, analyzed and designed based on criteria of current Iranian Code. Then, by using finite element methods and non-linear dynamic analysis, based on criteria of UFC Code, different columns and braces elimination scenarios were applied on mentioned structures and the potential of progressive collapse occurrence was determined by using some values like DCR (for link beams) and IF (for other members). The conclusions indicate that the elimination of side columns in comparison with different studied cases causes more critical status in the mentioned structures and considering effects of lateral stability of structures causes increasing the studied DCR values.
Building Engineering & Housing Science
مرکز تحقیقات راه، مسکن و شهرسازی
1735-8736
12
v.
1
no.
2018
1
12
https://behs.bhrc.ac.ir/article_87568_498b55f5e846340e112f511495d7cd47.pdf
Use of Steel Slag Mixed by Fly Ash as Stabilization of Road Subgrade
Ata
Aghaei Araei
faculty member of bhrc
author
Bahareh
Ktebi
Expert,Geoetechnics Department, Road,Housing & Urban Development Research Center.
author
Amirsaeid
Salamat
Expert,Geoetechnics Department, Road,Housing & Urban Development Research Center.
author
Saeid
Hashemi Tbatabaei
Faculty member- Road, Housing and Urban Development Research Center
author
text
article
2018
per
The use of steel slag in civil projects, such as road layers stabilization projects, is beneficial for the use of large volumes of these materials. This paper presents the geotechnical engineering properties of steel slag generated from Electrical-Arc-Furnaces (EAF) and its potential usage in subgrade layer of roads is assessed as well. Samples of soil and EAF slag were characterized through a series of laboratory tests, including: sand equivalent value, Los Angeles abrasion, soundness of aggregates using sodium sulphate, specific gravity, compaction, maximum and minimum density, large-scale direct shear, CBR and swelling tests. Various mixtures of EAF steel slag and fly ash, 2, 7, 12 and 20% (by weight), as alternative for lime, were also investigated. CBR and unconfined compression tests were performed after various curing times to evaluate the strength gain characteristics of the mixtures. Long-term swelling tests were also performed on the soil, EAF and mixture of EAF slag with fly ash samples. The values of CBR and internal friction angle of slag are higher than that of the natural soil, but the swelling potential of natural soil is higher than that of the slag. Moreover, the slag has the permissible limit according to the Iranian highway asphalt paving (Code 234) for PI, LL, sand value, Los Angeles abrasion and soundness. About 50% decrease in strength is observed for saturated sample compared to dry ones. The results indicate that the EAF slag had better engineering properties compared to the soil and the mixtures of EAF slag with different percentages of fly ash.
Building Engineering & Housing Science
مرکز تحقیقات راه، مسکن و شهرسازی
1735-8736
12
v.
1
no.
2018
13
19
https://behs.bhrc.ac.ir/article_87685_1f9b170ff7753c3b5ffda19dfa71a016.pdf
Analyzing and Evaluating the Applicability of Design Practices in Small-Scale Housing; Case Study: Pardis City Mehr Housing
Reza
HoseinPour
Graduate student of Islamic Art University of Tabriz
author
text
article
2018
per
< p >Assessment of housing is subject to analysis and identification of factors affecting it. To search on housing, many criteria are considered that measuring quantitative and qualitative aspects of their housing. Most housing researchers in areas beyond housing units, such as neighborhood or community are evaluated as well. This article deals with the issue of housing in terms of functionality and has developed indicators to analyze and evaluate it. According to the Mehr housing units, mostly functionality in a small area, they are very effective in customer satisfaction. Range of this research includes Mehr housing in Pardis City. In this study, based on library studies and research tools to collect information and classification of the apartment Plan was discussed. Then, ten different typical apartment buildings were analyzed by professional experts. Also, they were continued to examine and rely on the cross-sectional areas of housing functionality. The results indicate that the position of the various spaces and the relationship between them in the highest correlation with the functionality housing plan. This plan reflects the importance of geometry and the way it is designed to provide functionality. Another significant result of the present study was to assess the importance of the reception and living rooms in the entire housing. At last, the research presents guidelines for the promotion of housing functionality, such as adjusting the aspect ratio of spaces to each other and how to reduce unused spaces.
Building Engineering & Housing Science
مرکز تحقیقات راه، مسکن و شهرسازی
1735-8736
12
v.
1
no.
2018
21
30
https://behs.bhrc.ac.ir/article_87686_a1ebafcf9a64cda42577fe6c759179d0.pdf
Examining the Concepts of Native Architecture of Gilan in accordance with Sustainable Indices of Iranian Architecture
mahsa
delshad
Professor Assistant, Department of Architecture, Islamic Azad University, Lahijan Branch, Lahijan, Iran
author
maryam
hoseinpuor
Master Student, Department of Architecture, Islamic Azad University, Qazvin Branch, Qazvin, Iran
author
text
article
2018
per
In Iranian architecture that extends human intelligence in the construction of this architecture, various icons are influenced by this unitary thought. For decades, sustainable architecture has come to the fore, and many solutions have been proposed by it to solve the contemporary crisis, but there are still some problems in creating sustainable architecture. It seems that by removing obstacles by paying attention to the values and characteristics of the native architecture, it can be completed. Despite the differences in the physical and functional characteristics of the Gilan architecture in response to the climatic needs of other parts of Iran, it seems the rejection of the indicator, i.e., the rejection of semantic meaning of Iranian architecture is recognizable in this canvas. In this research, we sought to adapt the characteristics of Iranian architecture in the architecture of indigenous Gilan housing, considering the characteristics of sustainability. To achieve this purpose, analytical - descriptive research method and logical reasoning have been used in the base and comparative method in the field study area related to the analysis of the properties of houses. Finally, the conclusion of the consistency of the semantic indices (stability) of Iranian architecture in the architecture of Gilan region is being discussed.
Building Engineering & Housing Science
مرکز تحقیقات راه، مسکن و شهرسازی
1735-8736
12
v.
1
no.
2018
31
37
https://behs.bhrc.ac.ir/article_87687_3ee5f97621db4cbd374939258562efb5.pdf
Average Annual Minimum Temperature of the Country as a Necessity in Earthquake Disaster Management
fateme
dehghan farouji
academic member of seismology engineering and risk department of bhrc
author
text
article
2018
per
Iran is one of the countries experiencing various disasters, especially earthquakes, due to its structural and climatic conditions. The occurrence of earthquake disaster in Iran is unavoidable and the experience of past disasters suggests that various factors affect the human casualties and economic losses caused by the earthquake disaster. Identifying and knowledge of these factors in relation to seismic risk management can reduce the severity of casualties and damages of the earthquake disaster, and failure to pay attention to effective factors in exacerbating the effects of earthquake disaster makes it impossible to realize seismic risk management.One of the factors affecting the earthquake event casualties is the climate factor. Although the climate of a region includes various factors, the minimum temperature factor is more effective than other climatic factors in earthquake events. The minimum temperature itself creates a special condition, but in the conditions of the earthquake disaster, it will lead to the deterioration of the disaster. Therefore, the role of minimum temperature in earthquake disaster management is undeniable. The lack of accurate and differentiated information in this area can affect seismic disaster management in cold weather conditions, in order to enhance the level of disaster response and the various stages of disaster management, Country in terms of average annual minimum temperature was zoning. So that disaster planners and decision makers, with the prevention measures, can greatly reduce the disaster of the earthquake.
Building Engineering & Housing Science
مرکز تحقیقات راه، مسکن و شهرسازی
1735-8736
12
v.
1
no.
2018
39
43
https://behs.bhrc.ac.ir/article_87569_f882ffa0d214216d9ec19788508ed2f2.pdf
Using Smart Coatings, a New Way for Sustainable and Green Construction
Azadeh
Askarinejad
faculty member, BHRC
author
Zohreh
Shahrestani
Zanjan University
author
Sohrab
Veiseh
BHRC
author
text
article
2018
per
Insulation of buildings reduces the amount of energy needed to create a comfortable environment. Reducing energy consumption means reducing carbon emissions through energy production. In fact, insulation is the most cost-effective way to reduce carbon emissions. In this regard, the use of smart coatings on external surfaces of buildings minimizes the energy consumption and costs associated with indoor cooling and heating. In the production of these coatings, pigments with near infrared reflectance and thermochromic properties are used. Nano technology can be also used to improve the properties and performance of these coatings. In this study, thermochromic pigments of tungsten doped vanadium dioxide were synthesized in nanometer scale by hydrothermal method and their properties were investigated by various methods of characterization. After optimization, the product will be treated as a pigment in the coating formulation, or may be applied to different roof surfaces using different spraying methods.
Building Engineering & Housing Science
مرکز تحقیقات راه، مسکن و شهرسازی
1735-8736
12
v.
1
no.
2018
45
48
https://behs.bhrc.ac.ir/article_87688_3ad135119f761071cc449415fbe83b0b.pdf