Hassan Abbasi | Islamic Azad University, South Tehran Branch (original) (raw)
Papers by Hassan Abbasi
International Journal of Steel Structures, 2021
ABSTRACT Steel gusset plates are used to connect two or more structural elements in steel framed ... more ABSTRACT Steel gusset plates are used to connect two or more structural elements in steel framed structural system. The strength design of gusset plate requires calculation of the angle of load spread in gusset plate which is then used in determining its effective width. Current design guidelines usually use Whitmore model for determining the angle of load spread in the gusset plate to calculate the effective width. Whitmore model of load spread may be suitable for gusset plate which has multiple rows and columns of bolts since this model was developed based on test data obtained from such gusset plate connections. However, the gusset plates used in latticed antenna and electrical transmission towers usually have one bolt and sometimes, two bolts in the line of load application. Literature review did not find any research data or information on how to determine the angle of load spread in gusset plates to be used in such cases. Hence, this research was carried out using full-scale tests to determine the angle of load spread in gusset plates with one- and two- bolt connection. The study found that Whitmore model does not work for such gusset plate connections. The study recommended a new load spread model called Das-Abbasi model for determining the load spread in gusset plates with one and two bolts.
A detailed study was undertaken at the University of Windsor using both experimental method and f... more A detailed study was undertaken at the University of Windsor using both experimental method and finite element method to understand the failure modes and load distributions in gusset plate connections with one bolt typically used in communication towers. For such gusset plate connections, current American standard, ANSI/TIA-222G recommends checking for capacity in gross-section yielding. The experimental tests completed under the scope of this study show that this type of connection does not fail in gross-section yielding. This paper presents test procedure used and test data obtained from three full-scale tests on gusset plate connections with one bolt. This paper also presents a detailed discussion on finite element (FE) modeling and validation for this type of gusset plate connections. The FE model developed in this study is able to successfully predict the complicated behavior of the gusset plate connections with one bolt. The FE model also predicts that this type of connection ...
Advances in Civil Engineering
The environment receives millions of tons of garbage, including plastic and glass, and concrete b... more The environment receives millions of tons of garbage, including plastic and glass, and concrete building debris contributes to a number of environmental problems. In order to reduce cement and make use of waste materials like glass and plastic, this research creates compacted concrete samples using waste glass powder, waste plastic powder, micro-silica, fly ash, and recycled powdered concrete. Compressive, nonlinear behavior, and SEM tests on compacted specimens showed that by removing 80% of the cement and substituting 20% recycled concrete powder, 15% micro-silica, 15% fly ash, 15% waste plastic powder, and 15% waste glass powder (at 80°C for 20 minutes), sustainable concrete with compressive and flexural strengths nearly equal to the sample’s compressive and flexural strengths was produced. Micro-silica has several shortcomings regarding improving concrete strength and building a suitable combination with recycled concrete powder. In extremely small quantities, glass powder may b...
Kaka-Reza water conveyance tunnel has 3107 meter length which carries the water from Horrood Rive... more Kaka-Reza water conveyance tunnel has 3107 meter length which carries the water from Horrood River with 15 cubic meters per second capacity in the west of Iran. This tunnel will excavate for Khoramabad city water consumption. The rock mass of the tunnel is Servak formation limestone and the maximum overburden is about 700 meter. The excavation method is blasting based on technical and economic criteria. The convergence of tunnel is related to distance of excavation face and it is determined by Panet and Guenot and Chang equations. The strain in surrounding rock mass of tunnel is calculated with FLAC program in different convergence. The critical strain in rock mass is determined by Direct Strain Evaluation Technique (DSET). The maximum advance of excavation face of tunnel is estimated by strain control in surrounding rock mass of tunnel.
International Journal of Structural Integrity
PurposeToday, using lightweight structural concrete plays a major role in reducing the damage to ... more PurposeToday, using lightweight structural concrete plays a major role in reducing the damage to concrete structures. On the other hand, lightweight concretes have lower compressive and flexural strengths with lower impact resistance compared to ordinary concretes. The aim of this study is to investigate the effect of simultaneous use of waste glass powder, microsilica and polypropylene fibers to make sustainable lightweight concrete that has high compressive and flexural strengths, ductility and impact resistance.Design/methodology/approachIn this article, the lightweight structural concrete is studied to compensate for the lower strength of lightweight concrete. Also, considering the environmental aspects, microsilica as a partial replacement for cement, waste glass powder instead of some aggregates and polypropylene fibers are used. Microsilica was used at 8, 10 and 12 wt% of cement. Waste glass powder was added to 20, 25 and 30 wt% of aggregates, while fibers were used at 0.5, 1...
Azadi rockfill dam is located on Zemkan River in the west of Iran which has about 56 million cube... more Azadi rockfill dam is located on Zemkan River in the west of Iran which has about 56 million cube meters storage capacity and 51 meter height. There is a high permeable zone with 120 meters depth in left abutment. At this condition, there are many difficulties to sealing the foundation in dam axis. Therefore, it is decided to excavate four galleries in specific levels to grout the foundation. These access galleries have considered with modified horse shoe section. The dimensions of these galleries are 3 meters width and 3.5 meters height to carry the grouting equipments in it. Empirical methods such as Q, RMR and RSR systems are used for stability analysis and determination of support requirements. The results of these methods have analyzed with Distinct Element Method (DEM) which is preformed in UDEC program. The DEM analysis has different results in right and left abutment of dam due to the difference of discontinuity orientations. The empirical methods indicated that a 5 cm shotc...
Kaka-Reza water conveyance tunnel has 3107 meter length which carries the water from Horrood Rive... more Kaka-Reza water conveyance tunnel has 3107 meter length which carries the water from Horrood River with 15 cubic meters per second capacity in the west of Iran. This tunnel will excavate for Khoramabad city water consumption. The rock mass of the tunnel is Servak formation limestone and the maximum overburden is about 700 meter. The excavation method is blasting based on technical and economic criteria. The convergence of tunnel is related to distance of excavation face and it is determined by Panet and Guenot and Chang equations. The strain in surrounding rock mass of tunnel is calculated with FLAC program in different convergence. The critical strain in rock mass is determined by Direct Strain Evaluation Technique (DSET). The maximum advance of excavation face of tunnel is estimated by strain control in surrounding rock mass of tunnel.
Waterway tunnels related to hydroelectric power stations must first be analyzed as a general tunn... more Waterway tunnels related to hydroelectric power stations must first be analyzed as a general tunnel to prevent during construction problem. These problems may be encounter during excavation step. Saymareh hydroelectric power station is located at north-west of Dareh Shar, Ilam province, Iran. This dam is constructed on Saymareh River, a branch of Karkheh River. The formation of ground is Asmari-Shahbazan formation and its rock is classified as hard rock. In this paper, the support system is proposed based on evaluation of tunnel stability analysis using empirical, limit equilibrium. According to these methods, it is recommended to perform 10 cm shotcrete as preliminary support. The tunnel analysis is performed using UDEC program which is designated based on discrete element method. The results of discrete element analysis show that the tunnel will need no support system. Finally, the tunnel has excavated and it is observed that there is no need to support the tunnel during excavatio...
The analysis of the complex structure of the morning glory spillway of Parian storage dam is perf... more The analysis of the complex structure of the morning glory spillway of Parian storage dam is performed using 3D FEM and DEM modelling. The three dimensional model of this structure is separately analysed in ANSYS and 3DEC programs. This concrete structure is mostly constructed in rock. The rock mass and the concrete structure are modelled together because of the evaluation of the interaction between the rock mass and concrete lining and it’s effects on the thickness of concrete lining. The FEM and DEM analyses results are evaluated based on the evaluation of the strength of concrete lining with respect to the loads applied on it, which leads to the optimized thickness of the concrete lining. The major part of this paper is related to DEM analysis of the structure using 3DEC program and for the comparison purpose, the results of FEM and DEM analyses are compared and discussed according to a 2D analytical method and other concepts. The analyses indicate that the thickness of concrete ...
World Environmental and Water Resource Congress 2006, 2006
ABSTRACT The Sonnateh Dam is located in Kurdistan province at the west of Iran. The dam has 55 me... more ABSTRACT The Sonnateh Dam is located in Kurdistan province at the west of Iran. The dam has 55 meter height and 545 meter length. The dam body is made of earthfill and the core is made of water resist clay element. The clay core slope is o.5:1 horizontal to vertical. This slope is selected based on the condition of dam which is over an active fault. The fault has an angle of 60 degree with dam axis and located in right abutment of dam. The maximum and minimum deflection of the fault is estimated about 189 and 70 centimeter, respectively. The horizontal and vertical acceleration in MCL and MDL is 0.56g, 0.42g and 0.25g, 0.16g, respectively. The amount of accelerations is determined from local study id dam site. The two dimensional analysis of dam body with MCL and MDL is performed by GEO-SLOPE program. This analysis was a preliminary determination of dam body dimensions. The amount of safety factor and steady deflection of dam body is calculated during the earthquake. Also, the three dimensional analysis of fault movement is performed using ANSYS finite element based program. This analysis indicated the deflection of dam body which has to compare with allowable deflection of clay core. Based on this analysis, the safety factor of dam body is determined.
Abstract: In this study experimental and numerical investigation to determine the behaviour of gu... more Abstract: In this study experimental and numerical investigation to determine the behaviour of gusset plate connections with one and two bolts under quasi-static monotonically increasing tension load was undertaken. The experiments on full-scale gusset plate ...
A Structural Insulated Panel (SIP) is a structural element of expanded polystyrene insulation (EP... more A Structural Insulated Panel (SIP) is a structural element of expanded polystyrene insulation (EPS) core sandwiched between two oriented-strand boards (OSB). This research proposes SIPs in low-rise residential construction (i.e. houses and low-residential building), replacing the traditional conventional joist floors and stud walls. This research investigates (i) developing expressions for flexural, compression, monotonic racking and cyclic lateral load capacities of SIPs as compared to the joist/stud wall construction. In this study, the proposed design of SIPs was based on (i) generally established theory for analysis, (ii) assessment of full-scale SIP panels by a loading tester, and (iii) computer modeling using the finite-element modeling. The research program included (i) testing SIP walls in axial compression and bending, (ii) racking and cyclic testing on SIP shear walls, (iii) development of finite-element computer models of the tested SIP panels and verifying those using ex...
International Journal of Steel Structures, 2021
ABSTRACT Steel gusset plates are used to connect two or more structural elements in steel framed ... more ABSTRACT Steel gusset plates are used to connect two or more structural elements in steel framed structural system. The strength design of gusset plate requires calculation of the angle of load spread in gusset plate which is then used in determining its effective width. Current design guidelines usually use Whitmore model for determining the angle of load spread in the gusset plate to calculate the effective width. Whitmore model of load spread may be suitable for gusset plate which has multiple rows and columns of bolts since this model was developed based on test data obtained from such gusset plate connections. However, the gusset plates used in latticed antenna and electrical transmission towers usually have one bolt and sometimes, two bolts in the line of load application. Literature review did not find any research data or information on how to determine the angle of load spread in gusset plates to be used in such cases. Hence, this research was carried out using full-scale tests to determine the angle of load spread in gusset plates with one- and two- bolt connection. The study found that Whitmore model does not work for such gusset plate connections. The study recommended a new load spread model called Das-Abbasi model for determining the load spread in gusset plates with one and two bolts.
A detailed study was undertaken at the University of Windsor using both experimental method and f... more A detailed study was undertaken at the University of Windsor using both experimental method and finite element method to understand the failure modes and load distributions in gusset plate connections with one bolt typically used in communication towers. For such gusset plate connections, current American standard, ANSI/TIA-222G recommends checking for capacity in gross-section yielding. The experimental tests completed under the scope of this study show that this type of connection does not fail in gross-section yielding. This paper presents test procedure used and test data obtained from three full-scale tests on gusset plate connections with one bolt. This paper also presents a detailed discussion on finite element (FE) modeling and validation for this type of gusset plate connections. The FE model developed in this study is able to successfully predict the complicated behavior of the gusset plate connections with one bolt. The FE model also predicts that this type of connection ...
Advances in Civil Engineering
The environment receives millions of tons of garbage, including plastic and glass, and concrete b... more The environment receives millions of tons of garbage, including plastic and glass, and concrete building debris contributes to a number of environmental problems. In order to reduce cement and make use of waste materials like glass and plastic, this research creates compacted concrete samples using waste glass powder, waste plastic powder, micro-silica, fly ash, and recycled powdered concrete. Compressive, nonlinear behavior, and SEM tests on compacted specimens showed that by removing 80% of the cement and substituting 20% recycled concrete powder, 15% micro-silica, 15% fly ash, 15% waste plastic powder, and 15% waste glass powder (at 80°C for 20 minutes), sustainable concrete with compressive and flexural strengths nearly equal to the sample’s compressive and flexural strengths was produced. Micro-silica has several shortcomings regarding improving concrete strength and building a suitable combination with recycled concrete powder. In extremely small quantities, glass powder may b...
Kaka-Reza water conveyance tunnel has 3107 meter length which carries the water from Horrood Rive... more Kaka-Reza water conveyance tunnel has 3107 meter length which carries the water from Horrood River with 15 cubic meters per second capacity in the west of Iran. This tunnel will excavate for Khoramabad city water consumption. The rock mass of the tunnel is Servak formation limestone and the maximum overburden is about 700 meter. The excavation method is blasting based on technical and economic criteria. The convergence of tunnel is related to distance of excavation face and it is determined by Panet and Guenot and Chang equations. The strain in surrounding rock mass of tunnel is calculated with FLAC program in different convergence. The critical strain in rock mass is determined by Direct Strain Evaluation Technique (DSET). The maximum advance of excavation face of tunnel is estimated by strain control in surrounding rock mass of tunnel.
International Journal of Structural Integrity
PurposeToday, using lightweight structural concrete plays a major role in reducing the damage to ... more PurposeToday, using lightweight structural concrete plays a major role in reducing the damage to concrete structures. On the other hand, lightweight concretes have lower compressive and flexural strengths with lower impact resistance compared to ordinary concretes. The aim of this study is to investigate the effect of simultaneous use of waste glass powder, microsilica and polypropylene fibers to make sustainable lightweight concrete that has high compressive and flexural strengths, ductility and impact resistance.Design/methodology/approachIn this article, the lightweight structural concrete is studied to compensate for the lower strength of lightweight concrete. Also, considering the environmental aspects, microsilica as a partial replacement for cement, waste glass powder instead of some aggregates and polypropylene fibers are used. Microsilica was used at 8, 10 and 12 wt% of cement. Waste glass powder was added to 20, 25 and 30 wt% of aggregates, while fibers were used at 0.5, 1...
Azadi rockfill dam is located on Zemkan River in the west of Iran which has about 56 million cube... more Azadi rockfill dam is located on Zemkan River in the west of Iran which has about 56 million cube meters storage capacity and 51 meter height. There is a high permeable zone with 120 meters depth in left abutment. At this condition, there are many difficulties to sealing the foundation in dam axis. Therefore, it is decided to excavate four galleries in specific levels to grout the foundation. These access galleries have considered with modified horse shoe section. The dimensions of these galleries are 3 meters width and 3.5 meters height to carry the grouting equipments in it. Empirical methods such as Q, RMR and RSR systems are used for stability analysis and determination of support requirements. The results of these methods have analyzed with Distinct Element Method (DEM) which is preformed in UDEC program. The DEM analysis has different results in right and left abutment of dam due to the difference of discontinuity orientations. The empirical methods indicated that a 5 cm shotc...
Kaka-Reza water conveyance tunnel has 3107 meter length which carries the water from Horrood Rive... more Kaka-Reza water conveyance tunnel has 3107 meter length which carries the water from Horrood River with 15 cubic meters per second capacity in the west of Iran. This tunnel will excavate for Khoramabad city water consumption. The rock mass of the tunnel is Servak formation limestone and the maximum overburden is about 700 meter. The excavation method is blasting based on technical and economic criteria. The convergence of tunnel is related to distance of excavation face and it is determined by Panet and Guenot and Chang equations. The strain in surrounding rock mass of tunnel is calculated with FLAC program in different convergence. The critical strain in rock mass is determined by Direct Strain Evaluation Technique (DSET). The maximum advance of excavation face of tunnel is estimated by strain control in surrounding rock mass of tunnel.
Waterway tunnels related to hydroelectric power stations must first be analyzed as a general tunn... more Waterway tunnels related to hydroelectric power stations must first be analyzed as a general tunnel to prevent during construction problem. These problems may be encounter during excavation step. Saymareh hydroelectric power station is located at north-west of Dareh Shar, Ilam province, Iran. This dam is constructed on Saymareh River, a branch of Karkheh River. The formation of ground is Asmari-Shahbazan formation and its rock is classified as hard rock. In this paper, the support system is proposed based on evaluation of tunnel stability analysis using empirical, limit equilibrium. According to these methods, it is recommended to perform 10 cm shotcrete as preliminary support. The tunnel analysis is performed using UDEC program which is designated based on discrete element method. The results of discrete element analysis show that the tunnel will need no support system. Finally, the tunnel has excavated and it is observed that there is no need to support the tunnel during excavatio...
The analysis of the complex structure of the morning glory spillway of Parian storage dam is perf... more The analysis of the complex structure of the morning glory spillway of Parian storage dam is performed using 3D FEM and DEM modelling. The three dimensional model of this structure is separately analysed in ANSYS and 3DEC programs. This concrete structure is mostly constructed in rock. The rock mass and the concrete structure are modelled together because of the evaluation of the interaction between the rock mass and concrete lining and it’s effects on the thickness of concrete lining. The FEM and DEM analyses results are evaluated based on the evaluation of the strength of concrete lining with respect to the loads applied on it, which leads to the optimized thickness of the concrete lining. The major part of this paper is related to DEM analysis of the structure using 3DEC program and for the comparison purpose, the results of FEM and DEM analyses are compared and discussed according to a 2D analytical method and other concepts. The analyses indicate that the thickness of concrete ...
World Environmental and Water Resource Congress 2006, 2006
ABSTRACT The Sonnateh Dam is located in Kurdistan province at the west of Iran. The dam has 55 me... more ABSTRACT The Sonnateh Dam is located in Kurdistan province at the west of Iran. The dam has 55 meter height and 545 meter length. The dam body is made of earthfill and the core is made of water resist clay element. The clay core slope is o.5:1 horizontal to vertical. This slope is selected based on the condition of dam which is over an active fault. The fault has an angle of 60 degree with dam axis and located in right abutment of dam. The maximum and minimum deflection of the fault is estimated about 189 and 70 centimeter, respectively. The horizontal and vertical acceleration in MCL and MDL is 0.56g, 0.42g and 0.25g, 0.16g, respectively. The amount of accelerations is determined from local study id dam site. The two dimensional analysis of dam body with MCL and MDL is performed by GEO-SLOPE program. This analysis was a preliminary determination of dam body dimensions. The amount of safety factor and steady deflection of dam body is calculated during the earthquake. Also, the three dimensional analysis of fault movement is performed using ANSYS finite element based program. This analysis indicated the deflection of dam body which has to compare with allowable deflection of clay core. Based on this analysis, the safety factor of dam body is determined.
Abstract: In this study experimental and numerical investigation to determine the behaviour of gu... more Abstract: In this study experimental and numerical investigation to determine the behaviour of gusset plate connections with one and two bolts under quasi-static monotonically increasing tension load was undertaken. The experiments on full-scale gusset plate ...
A Structural Insulated Panel (SIP) is a structural element of expanded polystyrene insulation (EP... more A Structural Insulated Panel (SIP) is a structural element of expanded polystyrene insulation (EPS) core sandwiched between two oriented-strand boards (OSB). This research proposes SIPs in low-rise residential construction (i.e. houses and low-residential building), replacing the traditional conventional joist floors and stud walls. This research investigates (i) developing expressions for flexural, compression, monotonic racking and cyclic lateral load capacities of SIPs as compared to the joist/stud wall construction. In this study, the proposed design of SIPs was based on (i) generally established theory for analysis, (ii) assessment of full-scale SIP panels by a loading tester, and (iii) computer modeling using the finite-element modeling. The research program included (i) testing SIP walls in axial compression and bending, (ii) racking and cyclic testing on SIP shear walls, (iii) development of finite-element computer models of the tested SIP panels and verifying those using ex...