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    مهندسی عمران ، سازه

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    رزومه

    USING POLYETHER ETHER KETONE PARTICLES IN GFRP COMPOSITES FOR STRENGTHENING OF REINFORCED CONCRETE BEAMS

    Sadegh Dardaei, Hamed Bagheri, Niloufar Esmaeli
    Journal PapersTechnology , Volume 11 , Issue 1, 2020 January , {Pages 190-198 }

    Abstract

    One of the most common strengthening methods of structural elements is the use of Glass Fiber Reinforced Polymer (GFRP) composite. The two major components of a GFRP composite material is resin and reinforcement. A cured thermosetting resin without any reinforcement is glass-like in nature and appearance, but often very brittle. By adding a reinforcing fiber such as carbon fiber, glass, or aramid, the properties are vastly improved. The change in the properties of each of the components affects the general characteristics of GFRP. This research includes experimental and numerical studies. In the experimental part, the effect of two types of epoxy and polyesters resin in the mechanical properties of GFRP composite has been investigated. Then

    EFFECTS of DIFFERENT TYPES OF RECYCLED POLYMER AGGREGATES on MECHANICAL PROPERTIES of CONCRETE

    Pouria Darzekanani, Sadegh Dardaei, Hamed Bagheri
    Journal PapersJournal of Structural and Construction Engineering , 2020 April 29, {Pages }

    Abstract

    Plastic waste control has always been a major concern in many countries. The amount of these substances increases every year due to continued public consumption. Given the high cost of plastic recycling in developing countries, returning these materials to the industry for the production of building materials can be a viable solution to protect the environment. Since concrete is one of the most widely used composite materials in the building industry, it, therefore, provides a suitable base for the utilization of plastic waste. In this research, different plastic granules are replaced with a certain amount of fine natural aggregates, and the physical and mechanical properties of the concrete made from these materials are evaluated by necess

    Proposed new methods for modifying the mechanical characteristics of the artificial stone

    Ahmad Alinezhad, Sadegh Dardaei, Hamed Bagheri
    Journal PapersJournal of Structural and Construction Engineering , 2019 March 9, {Pages }

    Abstract

    In this paper, factors affecting the mechanical properties of polymeric granite artificial stone have been investigated. Epoxy resin and three types of additives called Poly ether ether ketone, Silicon rubber, and Nanoclay have been used to make the artificial stone. Unlike previous research on resin alone, this study has been conducted on artificial stone and samples made using these materials. These samples are compared with the control sample and the sample with optimal mechanical characteristics. The method of making artificial stone is that crushed stone blend with resin, and is molded into molds that are defined according to the American Association of Materials and Testing. Samples were made with two percentages of 7.5 and 15 percent

    Technical and administrative assessment of Plasco building incident

    Hamzeh Shakib, M Pirizadeh, S Dardaei, M Zakersalehi
    Journal PapersInternational Journal of Civil Engineering , Volume 16 , Issue 9, 2018 September 1, {Pages 1227-1239 }

    Abstract

    In this study, the fire-induced progressive collapse of Plasco building incident is briefly assessed from different perspectives including: (1) the most probable building collapse scenario, (2) the structural deficiencies causing the progressive collapse, (3) the key problems in the electrical and mechanical installations leading to the fire outbreak, (4) the problems in building maintenance and up keeping procedures according to the Iranian requirements, (5) the simulation of the fire and smoke propagation during the incident, and (6) the strengths and weaknesses of the crisis management procedure. The results showed that the start of the fire and its spread was the consequence of two combined sources: the non-standard maint

    Evaluating the effect of the thickness and yield point of steel on the response modification factor of RC frames braced with steel plate

    Reza Aghayari, Sadegh Dardaei
    Journal PapersKSCE Journal of Civil Engineering , Volume 22 , Issue 5, 2018 May 1, {Pages 1865-1871 }

    Abstract

    Steel Shear Walls (SSW) in buildings are known to be an effective means for resisting lateral loading. By using un-stiffened walls and allowing them to buckle, their energy dissipation capacity will increase significantly due to the post-buckling capacity. The features of this system are being economical, quick and easy construction, low weight compared to similar systems, high ductility, high energy absorption and substantially reducing residual stress in structures. New methods and technologies obtained in the field of metals have provided new steel materials (LYP) to that has lower yield strength than conventional steel A36. This type of steel material shows the ability to deform and absorb more energy before failure. In t

    Experimental and analytical evaluation of confined masonry walls retrofitted with CFRP strips and mesh-reinforced PF shotcrete

    Hamzeh Shakib, Sadegh Dardaei, Mehran Mousavi, Mohammad Khalaf Rezaei
    Journal PapersJournal of Performance of Constructed Facilities , Volume 30 , Issue 6, 2016 December 1, {Pages 04016039 }

    Abstract

    This study evaluates the performance of retrofitted confined unreinforced masonry walls using carbon fiber–reinforced polymer (CFRP) strips and mesh-reinforced shotcrete. Polypropylene-fiber (PF) concrete was applied in the shotcrete retrofitting. Four full-scale confined unreinforced masonry walls were experimentally tested under in-plane lateral cyclic loading. The first nonretrofitted wall was built as a reference model. The second and third walls were retrofitted with carbon fiber–reinforced polymer strips in grid and diagonal layout, respectively. The fourth wall was retrofitted with mesh-reinforced PF shotcrete. The stiffness, strength, ductility, and modes of failure of the nonretrofitted confined masonry wall and the retrofitted

    STUDY ON THE EFFECT OF SHAHIN-DEZH GREEN TUFF ON THE MECHANICAL CHARACTERISTICS OF ROLLER COMPACT CONCRETE

    SADEGH DARDAEI, REZA AGHAYARI, NIA BABAK NIK
    Journal Papers , Volume 3 , Issue 3, 2016 January 1, {Pages 97-111 }

    Abstract

    Due to the growing popularity of concrete structure and increasing use of them, especially Roller compacted concrete, applying Pozzolan and replacing cement with Pozzolan is very important. Nowadays, the use of the additive for cement replacement is common in RCC mix design due to its technical advantages and economic benefits as there is large quantity of Pozzolan mineral resources in Iran. In this paper the impact of produced concrete has been fully considered as well as the effect of this Pozzolan on the compressive strength, tensile strength and permeability by using green Tuff obtained from available Pozzolan in western Azarbaijan. The due results prove that Shahin-Dezh green Tuff improves concretes quality.

    THE EFFECTS OF POST-CURING ON THE MECHANICAL PROPERTIES OF POLYMER CEMENT CONCRETE

    SADEGH DARDAEI, HAMED BAGHERI
    Journal Papers , Volume 16 , Issue 2, 2016 January 1, {Pages 117-124 }

    Abstract

    It is well known that general concrete alone lacks excellent mechanical properties especially in tension, hence there is need for modification by polymers. Research on polymer concrete began in the 1950s and it has been actively used since the 1970s. The use of Polymer cement concrete is in rapid increase as it possesses improved qualities over conventional concrete. Adequate design of polymer concrete members requires appropriate understanding of its mechanical behavior. There are three kind of polymer concrete: A) polymer concrete (PC): this kind of polymer concrete is formed by polymerization a mixture of a monomer of a thermoset polymer and aggregate, B) latex-modified concrete (LMC): this kind of polymer concrete is named polymer Portl

    Experimental investigation of the seismic performance of retrofitted masonry flat arch diaphragms

    Hamzeh Shakib, AliReza Mirjalili, Sadegh Dardaei, Ali Mazroei
    Journal PapersJournal of Performance of Constructed Facilities , Volume 29 , Issue 4, 2015 August 1, {Pages 04014115 }

    Abstract

    Masonry flat arch diaphragm that developed in Britain is still in use in parts of Europe, North America, the Middle East, and Indian subcontinent. The damage of a large number of these diaphragms during past earthquakes all around the world highlighted the need for developing an appropriate retrofitting method. In this study, the in-plane seismic behavior of ordinary and the retrofitted brick flat arch diaphragms are experimentally investigated. Eight full-scale experiments were conducted under cyclic loading. Perpendicular and parallel loads were applied to the steel I-cross beams of the masonry flat arch diaphragms. The experimental models consisted of two frames of masonry flat arch diaphragms in the absence of brick flat arch, two ordin

    COMPARATIVE STUDY ON SEISMIC PERFORMANCE OF CONFINED UNREINFORCED MASONRY WALLS CONSTRUCTED BY SOLID AND HOLLOW BRICKS

    Mehran MOUSAVI, Mohammad KHALAF REZAEI, Hamzeh SHAKIB, Sadegh DARDAEI, Masoud SAMADIAN
    Journal Papers , 2015 May 18, {Pages }

    Abstract

    Figure 2. Hollow brick and solid brick masonry walls with bed-joint sliding failure The seismic performance of both experimented walls was calibrated by finite element analysis. Modelling of masonry is performed by two main approaches consist of micro-modelling and macro modelling. In this paper, the macro-modelling approach was used where all components are smeared into a homogeneous continuum. Macro-modelling created proper approximation of general behaviour of both experimental models in case of failure mode and maximum strength.

    NUMERICAL AND EXPERIMENTAL SEISMIC EVALUATION OF CONFINED MASONRY WALL RETROFITTED BY POLYPROPYLENE FIBER, STEEL FIBER AND WIRE MESH REINFORCED SHOTCRETE

    Mohammad KHALAF REZAE, Mehran MOUSAVI, Hamzeh SHAKIB, Sadegh DARDAEI, Masoud SAMADIAN
    Journal Papers , 2015 May 18, {Pages }

    Abstract

    In this study a numerical modelling base on the micro modelling was also, carry out in order to calibrate behavior of the tested specimens in terms of shear/displacement, shear capacity, and cracking pattern of the walls. In this approach both brick and mortar materials were modelled separately by means of nonlinear continuous elements (Lourenco, 1996). Dynamic explicit method carried out in the numerical analysis. The analytical outcome agreed reasonably well with the experimental results. Figure 2 shows the crack pattern and damage of the numerical models and experiment models.

    Analytical and experimental seismic evaluation of confined masonry walls retrofitted by steel-fiber and polypropylene shotcrete

    Sadegh Dardaei, Hamzeh Shakib, Mohammad Khalaf Rezaei, Mehran Mousavi
    Journal PapersJournal of Seismology and Earthquake Engineering , Volume 16 , Issue 4, 2014 January , {Pages 271-280 }

    Abstract

    This paper presents experimental and analytical results of in-plane behaviour of confined URM walls retrofitted using steel-fiber and polypropylene shotcrete. In this paper, the experimental programconsists of testing three CURMwalls. The first specimen wall was tested as a reference wall without any retrofitting. The second and third specimens were retrofitted by using a 50 mmthick layer of steel-fiber and polypropylene-fiber shotcrete on one side in order to compare the behavior of them. The stiffness, shear strength, ductility, and failure mode of the wall specimens were determined and compared. The comparison of the tests results indicated that the shear capacity of the retrofitted walls with mesh-reinforced shotcrete and polypropylene

    Analytical and experimental seismic evaluation of unreinforced masonry walls retrofitted by Shotcrete and FRP strips

    Hamzeh Shakib, Mehran Mousavi, Mohammad Kahlaf Rezaei, Sadegh Dardaei, Mehdi Ahmadizadeh
    Conference Papers12th Canadian Masonry Symposium , 2013 April 1, {Pages }

    Abstract

    Iran is an earthquake-prone country with a history of more than 20 major earthquakes in the last 100 years, causing large-scale damage and human casualties. A high percentage of Iranian buildings are unreinforced masonry (URM) buildings. Construction of unreinforced masonry buildings in Iran dates back to more than 2000 years ago. The existing masonry buildings in Iran are mainly constructed in the past 50 years. Most of these buildings have poor materials and have not been designed forseismic loads. Recent earthquakes have shown that many such buildings are seismically vulnerable andshould be retrofitted.

    Analytical and experimental seismic evaluation of unreinforced masonry walls retrofitted by Shotcrete and FRP strips

    Hamzeh Shkib, Mehran Mousavi, Mohammad Kahlaf Rezaei, Sadegh Dardaei, Mehdi Ahmadizadeh
    Conference Papers12th Canadian Masonry Symposium , 2012 October 19, {Pages }

    Abstract

    Iran is an earthquake-prone country with a history of more than 20 major earthquakes in the last 100 years, causing large-scale damage and human casualties. A high percentage of Iranian buildings are unreinforced masonry (URM) buildings. Construction of unreinforced masonry buildings in Iran dates back to more than 2000 years ago. The existing masonry buildings in Iran are mainly constructed in the past 50 years. Most of these buildings have poor materials and have not been designed forseismic loads. Recent earthquakes have shown that many such buildings are seismically vulnerable andshould be retrofitted.

    Vulnerability evaluation and seismic rehabilitation of steel building with semi-rigid connections (Case study-tehran)

    H Shakib, S Dardaei, M Pirizadeh, A Moghaddasi
    Journal PapersThe 14th world conference on earthquake engineering , 2008 January , {Pages }

    Abstract

    In this paper, the seismic rehabilitation of a steel building with semi-rigid connections in Tehran is presented. This building with 19 stories in three blocks and an asymmetric plan has been constructed 30 years ago. First step of the rehabilitation study includes qualitative vulnerability evaluation which indicates that the building has heavy seismic vulnerability potential. In the second step, quantitative vulnerability of the structure according to FEMA 356 guideline is evaluated. The results showed that the building is resistant enough against gravity loads but not safe enough for seismic loads. Finally, two seismic retrofitting plans consisting of concrete shear walls and steel shear walls are proposed. Comparison of retrofitting plan

    Application of Reliability Engineering in Urban Seismic Risk Management

    Mahboobeh Pirizadeh, Sadegh Dardaei
    Journal Papers , January , {Pages }

    Abstract

    Seismic risk management plays an important role for rational decision-making of both public and private sectors in the seismic prone urban areas. In this approach, the seismic hazards and seismic damages can be translated to the quantitative probabilistic losses. Therefore, the risk-based urban decisions for reducing, transferring or retaining of probable damages and losses are facilitated for a wide range of users from urban policy-makers to clients of a specific project. This paper presents some applications of the reliability-oriented performance-based earthquake engineering in facilitating decision-making in urban seismic risk management. For this purpose, the seismic performance of a case study twelve-story setback building is assessed

    Proposed Cyclic Loading Protocol of Moment-Resisting Connections for Soft Soil Sites

    Sadegh Dardaei, Farhad Daneshjoo
    Journal Papers , January , {Pages }

    Abstract

    In earthquake engineering, experimentation may have a variety of objectives and may utilize different testing techniques, ranging from field to laboratory experimentation, dynamic to quasi-static experimentation, and two to threedimensional experimentation [1]. The study presented in this paper is concerned with development of quasi-static loading protocol for experimentation of moment-resisting connections for structures located on soft soil sites. The knowledge of strength and deformation capacities of structural elements is necessary to seismic design of structures based on performance based design method. In many cases, experimental testing is required because the capacities cannot be predicted exactly by analytical modelling, thus quas

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