Mohammad Amin Tutunchian | Payame Noor University (PNU) (original) (raw)
Papers by Mohammad Amin Tutunchian
Calcareous sediments are located in temperate and tropical areas near offshore hydrocarbon indust... more Calcareous sediments are located in temperate and tropical areas near offshore hydrocarbon industries and petrochemical reserves such as the Persian Gulf of Iran. These sediments have complicated physical properties which make them completely different from silicate soils. Carbonate sediments are mainly formed by the skeletal remains of marine organisms. Therefore, a wide variety of engineering properties can be found in these soils due to different locations and fauna that contribute to their formation. Therefore, it has been complicated to predict the geotechnical properties and mechanical behaviour of calcareous soils (Shahnazari et al., 2013). In this study, a set of hollow cylinder torsional tests were performed on calcareous sand specimens to investigate the similarities and differences between the undrained monotonic and cyclic behaviours of calcareous sands. This is an important fact that the monotonic behaviour of a soil specimen can be used to interpret its cyclic behaviou...
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The European Physical Journal Plus
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International Journal of Civil Engineering, 2016
Complete recognition of calcareous sediments engineering behavior considering their local expansi... more Complete recognition of calcareous sediments engineering behavior considering their local expansion and wide variety of engineering properties is very important. In south parts of Iran, there are some carbonate hydrocarbon reservoirs which are covered by calcareous deposits. Hormuz Island in is one of the most strategic areas in Hormuz Strait between the Persian Gulf and Oman Sea. In this study, a series of undrained monotonic and cyclic simple shear tests was performed on saturated Hormuz calcareous sand specimens using hollow cylinder torsional apparatus. The tests were carried out on specimens with various relative densities under different effective consolidation stresses. Based on the results, pore pressure generation, shear strain development, stress–strain characteristics of the specimens are presented and compared with the technical literature. In addition, dissipation of strain-based energy during the cyclic loading and its relation to excess pore water pressure is described. The cyclic resistance curves of specimens with different initial conditions are plotted. Also the results of monotonic and cyclic tests are compared together for better interpretation of Hormuz calcareous sand under undrained torsional loading.
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International Journal of Geomechanics, 2016
The simplified shear-wave velocity (Vs)–based procedure of liquefaction potential assessment was ... more The simplified shear-wave velocity (Vs)–based procedure of liquefaction potential assessment was basically developed for terrigenous deposits, whereas its applicability for calcareous soils is not fully recognized. The present study used the seismological and geotechnical data of Kawaihae Harbor, the most strategic port of Hawaii, to evaluate conservatism of the currently used simplified procedure for this case history. During the Kiholo Bay 2006 earthquake, the port experienced extensive liquefaction and subsequent ground failure in the dredged fill and natural calcareous deposits. Using the Vs profiles of the subsoil in Kawaihae Harbor, the simplified procedure and the Monte Carlo simulation (MCS) technique were used to evaluate liquefaction potential of the site through deterministic and probabilistic frameworks. The results obtained from the deterministic and the site-specific probabilistic approaches indicate extents of liquefaction occurrence in the shallow depths between 3.5 and 6.5 m. In contrast, probabilistic analysis with the available liquefaction probability--factor of safety (PL-FS) correlations resulted in an unconservative prediction, with the liquefied depth ranging between 5.6 and 6.1 m. Results of this study confirm that the current simplified procedure with either deterministic or site-specific probabilistic frameworks obtained reliable estimation of liquefaction occurrence in the studied site. However, further case histories of liquefaction occurrence in calcareous deposits are required to clarify applicability of the simplified procedure for such materials. Based on the results of the current study, there is still potential for liquefaction occurrence in the studied site during future earthquakes.
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Japanese Geotechnical Society Special Publication, 2016
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Journal of Civil and Environmental Engineering, 2011
In this paper first, Two buildings have been modeled and then analyzed using nonlinear static ana... more In this paper first, Two buildings have been modeled and then analyzed using nonlinear static analysis method under two different conditions in Nonlinear SAP 2000 software. In the first condition the interaction of soil adjacent to the walls of basement are ignored while in the second case this interaction have been modeled using Gap elements of nonlinear SAP2000 software. Finally, comparing the results of two models, the effects of soil-structure on period, target point displacement, internal forces, shape deformations and base shears have been studied. According to the results, this interaction has always increased the base shear of buildings, decreased the period of structure and target point displacement, and often decreased the internal forces and displacements. Keywords—Seismic Rehabilitation, Soil-Structure Interaction, Short Structure, Nonlinear Static Analysis.
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ABSTRACT Evolutionary polynomial regression (EPR) is a novel soft computing technique, which has ... more ABSTRACT Evolutionary polynomial regression (EPR) is a novel soft computing technique, which has been developed recently, and was initially used for modeling environmental phenomena by its presenters. Later on, other activities such as evaluating uplift capacity of suction caissons, shear strength of reinforced concrete deep beams, predicting superficial foundation subsidence, and determining the liquefaction potential of sands have been conducted by EPR technique. In this paper, the results of some experiments on municipal waste materials of Tehran are used to develop a new EPR-based model to predict the stress-strain behaviour of municipal waste material buried in Kahrizak landfill. The experiments were focused on the effects of shearing rates, and vertical stresses. The results of afterward statistical analyses showed the robustness of the new predictive model.
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Marine Georesources & Geotechnology, 2015
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The OpenURL standard is a protocol for transmission of metadata describing the resource that you ... more The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource ...
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Advanced Materials Research, 2011
Control devices can be used in structures to attenuate undesirable vibration on engineering struc... more Control devices can be used in structures to attenuate undesirable vibration on engineering structures. In order to mitigate the response of structures during the earthquakes and high intensity winds semi active control has been widely used. Semi-active control need less energy in compare with active control. So they are more reliable and more effective in mitigating the effects of earthquakes. MR damper are semi active control devices that are managed by sending external voltage supply. The inducing current monitoring of MR dampers are intelligently managed by fuzzy logic control (FLC). Validation of fuzzy logic controller that is optimized by a particle swarm optimization(PSO) is pursued in this study. Finally, optimal fuzzy logic controller is identified and validated through numerical simulation for seismic excitation. In 3-storey benchmark building, results showed that optimized fuzzy logic controller was robust and effective in reduction of both displacement and acceleration r...
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KSCE Journal of Civil Engineering, 2012
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Journal of Transportation Engineering, 2012
ABSTRACT The pavement condition index (PCI) is a widely used numerical index for the evaluation o... more ABSTRACT The pavement condition index (PCI) is a widely used numerical index for the evaluation of the structural integrity and operational condition of pavements. Estimation of the PCI is based on the results of a visual inspection in which the type, severity, and quantity of distresses are identified. The purpose of this study is to develop an alternative approach for forecasting the PCI using optimization techniques, including artificial neural networks (ANN) and genetic programming (GP). The proposed soft computing method can reliably estimate the PCI and can be used in a pavement management system (PMS) using simple and accessible spreadsheet softwares. A database composed of the PCI results of more than 1,250 km of highways in Iran was used to develop the models. The results showed that the ANN-and GP-based projected values are in good agreement with the field-measured data. In addition, the ANN-based model was more precise than the GP-based model. For more straightforward applications, a computer program was developed based on the results obtained. DOI: 10.1061/(ASCE)TE.1943-5436.0000454. (C) 2012 American Society of Civil Engineers.
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Calcareous sediments are located in temperate and tropical areas near offshore hydrocarbon indust... more Calcareous sediments are located in temperate and tropical areas near offshore hydrocarbon industries and petrochemical reserves such as the Persian Gulf of Iran. These sediments have complicated physical properties which make them completely different from silicate soils. Carbonate sediments are mainly formed by the skeletal remains of marine organisms. Therefore, a wide variety of engineering properties can be found in these soils due to different locations and fauna that contribute to their formation. Therefore, it has been complicated to predict the geotechnical properties and mechanical behaviour of calcareous soils (Shahnazari et al., 2013). In this study, a set of hollow cylinder torsional tests were performed on calcareous sand specimens to investigate the similarities and differences between the undrained monotonic and cyclic behaviours of calcareous sands. This is an important fact that the monotonic behaviour of a soil specimen can be used to interpret its cyclic behaviou...
Bookmarks Related papers MentionsView impact
The European Physical Journal Plus
Bookmarks Related papers MentionsView impact
The European Physical Journal Plus
Bookmarks Related papers MentionsView impact
International Journal of Civil Engineering, 2016
Complete recognition of calcareous sediments engineering behavior considering their local expansi... more Complete recognition of calcareous sediments engineering behavior considering their local expansion and wide variety of engineering properties is very important. In south parts of Iran, there are some carbonate hydrocarbon reservoirs which are covered by calcareous deposits. Hormuz Island in is one of the most strategic areas in Hormuz Strait between the Persian Gulf and Oman Sea. In this study, a series of undrained monotonic and cyclic simple shear tests was performed on saturated Hormuz calcareous sand specimens using hollow cylinder torsional apparatus. The tests were carried out on specimens with various relative densities under different effective consolidation stresses. Based on the results, pore pressure generation, shear strain development, stress–strain characteristics of the specimens are presented and compared with the technical literature. In addition, dissipation of strain-based energy during the cyclic loading and its relation to excess pore water pressure is described. The cyclic resistance curves of specimens with different initial conditions are plotted. Also the results of monotonic and cyclic tests are compared together for better interpretation of Hormuz calcareous sand under undrained torsional loading.
Bookmarks Related papers MentionsView impact
International Journal of Geomechanics, 2016
The simplified shear-wave velocity (Vs)–based procedure of liquefaction potential assessment was ... more The simplified shear-wave velocity (Vs)–based procedure of liquefaction potential assessment was basically developed for terrigenous deposits, whereas its applicability for calcareous soils is not fully recognized. The present study used the seismological and geotechnical data of Kawaihae Harbor, the most strategic port of Hawaii, to evaluate conservatism of the currently used simplified procedure for this case history. During the Kiholo Bay 2006 earthquake, the port experienced extensive liquefaction and subsequent ground failure in the dredged fill and natural calcareous deposits. Using the Vs profiles of the subsoil in Kawaihae Harbor, the simplified procedure and the Monte Carlo simulation (MCS) technique were used to evaluate liquefaction potential of the site through deterministic and probabilistic frameworks. The results obtained from the deterministic and the site-specific probabilistic approaches indicate extents of liquefaction occurrence in the shallow depths between 3.5 and 6.5 m. In contrast, probabilistic analysis with the available liquefaction probability--factor of safety (PL-FS) correlations resulted in an unconservative prediction, with the liquefied depth ranging between 5.6 and 6.1 m. Results of this study confirm that the current simplified procedure with either deterministic or site-specific probabilistic frameworks obtained reliable estimation of liquefaction occurrence in the studied site. However, further case histories of liquefaction occurrence in calcareous deposits are required to clarify applicability of the simplified procedure for such materials. Based on the results of the current study, there is still potential for liquefaction occurrence in the studied site during future earthquakes.
Bookmarks Related papers MentionsView impact
Japanese Geotechnical Society Special Publication, 2016
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Journal of Civil and Environmental Engineering, 2011
In this paper first, Two buildings have been modeled and then analyzed using nonlinear static ana... more In this paper first, Two buildings have been modeled and then analyzed using nonlinear static analysis method under two different conditions in Nonlinear SAP 2000 software. In the first condition the interaction of soil adjacent to the walls of basement are ignored while in the second case this interaction have been modeled using Gap elements of nonlinear SAP2000 software. Finally, comparing the results of two models, the effects of soil-structure on period, target point displacement, internal forces, shape deformations and base shears have been studied. According to the results, this interaction has always increased the base shear of buildings, decreased the period of structure and target point displacement, and often decreased the internal forces and displacements. Keywords—Seismic Rehabilitation, Soil-Structure Interaction, Short Structure, Nonlinear Static Analysis.
Bookmarks Related papers MentionsView impact
International Journal of Geomechanics
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The European Physical Journal Plus
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Soil Dynamics and Earthquake Engineering
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ABSTRACT Evolutionary polynomial regression (EPR) is a novel soft computing technique, which has ... more ABSTRACT Evolutionary polynomial regression (EPR) is a novel soft computing technique, which has been developed recently, and was initially used for modeling environmental phenomena by its presenters. Later on, other activities such as evaluating uplift capacity of suction caissons, shear strength of reinforced concrete deep beams, predicting superficial foundation subsidence, and determining the liquefaction potential of sands have been conducted by EPR technique. In this paper, the results of some experiments on municipal waste materials of Tehran are used to develop a new EPR-based model to predict the stress-strain behaviour of municipal waste material buried in Kahrizak landfill. The experiments were focused on the effects of shearing rates, and vertical stresses. The results of afterward statistical analyses showed the robustness of the new predictive model.
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Marine Georesources & Geotechnology, 2015
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EPJ Web of Conferences, 2010
The OpenURL standard is a protocol for transmission of metadata describing the resource that you ... more The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource ...
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Advanced Materials Research, 2011
Control devices can be used in structures to attenuate undesirable vibration on engineering struc... more Control devices can be used in structures to attenuate undesirable vibration on engineering structures. In order to mitigate the response of structures during the earthquakes and high intensity winds semi active control has been widely used. Semi-active control need less energy in compare with active control. So they are more reliable and more effective in mitigating the effects of earthquakes. MR damper are semi active control devices that are managed by sending external voltage supply. The inducing current monitoring of MR dampers are intelligently managed by fuzzy logic control (FLC). Validation of fuzzy logic controller that is optimized by a particle swarm optimization(PSO) is pursued in this study. Finally, optimal fuzzy logic controller is identified and validated through numerical simulation for seismic excitation. In 3-storey benchmark building, results showed that optimized fuzzy logic controller was robust and effective in reduction of both displacement and acceleration r...
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KSCE Journal of Civil Engineering, 2012
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Journal of Transportation Engineering, 2012
ABSTRACT The pavement condition index (PCI) is a widely used numerical index for the evaluation o... more ABSTRACT The pavement condition index (PCI) is a widely used numerical index for the evaluation of the structural integrity and operational condition of pavements. Estimation of the PCI is based on the results of a visual inspection in which the type, severity, and quantity of distresses are identified. The purpose of this study is to develop an alternative approach for forecasting the PCI using optimization techniques, including artificial neural networks (ANN) and genetic programming (GP). The proposed soft computing method can reliably estimate the PCI and can be used in a pavement management system (PMS) using simple and accessible spreadsheet softwares. A database composed of the PCI results of more than 1,250 km of highways in Iran was used to develop the models. The results showed that the ANN-and GP-based projected values are in good agreement with the field-measured data. In addition, the ANN-based model was more precise than the GP-based model. For more straightforward applications, a computer program was developed based on the results obtained. DOI: 10.1061/(ASCE)TE.1943-5436.0000454. (C) 2012 American Society of Civil Engineers.
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Computers & Geosciences, 2011
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