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- 저자 : Majid, Nik Muhamad (검색결과 723 건)
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Majid Reza Akhoundan,Kia Khademi,Sam Bahmanoo,Karzan Wakil,Edy Tonnizam Mohamad,Majid Khorami 국제구조공학회 2018 Smart Structures and Systems, An International Jou Vol.22 No.5
Computational Building Information Modeling (BIM) is an intelligent 3D model-based process that provides architecture, engineering, and construction professionals the insight to plan, design, construct, and manage buildings and infrastructure more efficiently. This paper aims at using BIM in Hospitals configurations protection. Infrastructure projects are classified as huge structural projects taking advantage of many resources such as finance, materials, human labor, facilities and time. Immense expenses in infrastructure programs should be allocated to estimating the expected results of these arrangements in domestic economy. Hence, the significance of feasibility studies is inevitable in project construction, in this way the necessity in promoting the strategies and using global contemporary technologies in the process of construction maintenance cannot be neglected. This paper aims at using the building information modeling in covering Imam Khomeini Hospital’s equipment. First, the relationship between hospital constructions maintenance and repairing, using the building information modeling, is demonstrated. Then, using library studies, the effective factors of constructions’ repairing and maintenance were collected. Finally, the possibilities of adding these factors in Revit software, as one of the most applicable software within BIM is investigated and have been identified in some items, where either this software can enter or the software for supporting the repairing and maintenance phase lacks them. The results clearly indicated that the required graphical factors in construction information modeling can be identified and applied successfully.
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Akhoundan, Majid Reza,Khademi, Kia,Bahmanoo, Sam,Wakil, Karzan,Mohamad, Edy Tonnizam,Khorami, Majid Techno-Press 2018 Smart Structures and Systems, An International Jou Vol.22 No.5
Computational Building Information Modeling (BIM) is an intelligent 3D model-based process that provides architecture, engineering, and construction professionals the insight to plan, design, construct, and manage buildings and infrastructure more efficiently. This paper aims at using BIM in Hospitals configurations protection. Infrastructure projects are classified as huge structural projects taking advantage of many resources such as finance, materials, human labor, facilities and time. Immense expenses in infrastructure programs should be allocated to estimating the expected results of these arrangements in domestic economy. Hence, the significance of feasibility studies is inevitable in project construction, in this way the necessity in promoting the strategies and using global contemporary technologies in the process of construction maintenance cannot be neglected. This paper aims at using the building information modeling in covering Imam Khomeini Hospital's equipment. First, the relationship between hospital constructions maintenance and repairing, using the building information modeling, is demonstrated. Then, using library studies, the effective factors of constructions' repairing and maintenance were collected. Finally, the possibilities of adding these factors in Revit software, as one of the most applicable software within BIM is investigated and have been identified in some items, where either this software can enter or the software for supporting the repairing and maintenance phase lacks them. The results clearly indicated that the required graphical factors in construction information modeling can be identified and applied successfully.
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Temperature effects on brittle fracture in cracked asphalt concretes
Majid-Reza Ayatollahi,Sadjad Pirmohammad 국제구조공학회 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.45 No.1
Cracking at low temperatures is one of the frequently observed modes of failure in asphalt concretes. In this investigation, fracture tests were performed on cracked asphalt concrete subjected to pure mode I and pure mode II loading at different subzero temperatures. An improved semi-circular bend (SCB)specimen containing a vertical crack was used to conduct the experiments. The SCB specimens produced from the gyratory compacted cylindrical samples were compressively loaded, and critical stress intensity factors, KIfand KIIf, were then calculated using peak loads obtained from the tests. The experimental results showed that with decreasing the temperature, mode I and mode II critical stress intensity factors increased first but below a certain temperature they both decreased. It was also found that at a fixed temperature, the mode II fracture resistance of the asphalt concrete was higher than its mode I fracture resistance.
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Majid Khorami,Masoud Khorami,Hedayatollah Motahar,Mohammadfarid Alvansazyazdi,Mahdi Shariati,Abdolrahim Jalali,M.M. Tahir 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.63 No.2
In this paper, the incremental nonlinear dynamic analysis is used to evaluate the seismic performance of steel moment frame structures. To this purpose, three special moment frame structure with 5, 10 and 15 stories are designed according to the Iran\'s national building code for steel structures and the provisions for design of earthquake resistant buildings (2800 code). Incremental Nonlinear Analysis (IDA) is performed for 15 different ground motions, and responses of the structures are evaluated. For the immediate occupancy and the collapse prevention performance levels, the probability that seismic demand exceeds the seismic capacity of the structures is computed based on FEMA350. Also, fragility curves are plotted for three high-code damage levels using HASUS provisions. Based on the obtained results, it is evident that increase in the height of the frame structures reduces the reliability level. In addition, it is concluded that for the design earthquake the probability of exceeding average collapse prevention level is considerably larger than high and full collapse prevention levels.9.
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Majid Baghdadi,Bahram Alipour Soltani,Mohammad Nourani 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.55 No.-
In this study, high capacity and regenerable fibrous cellulose sulfate was prepared by chemical modification of medical cotton waste and its performance was evaluated for malachite green removal through batch and fixed-bed experiments. Equilibrium was achieved after 30 min of mixing (t90%: 3.5 min at 200 mg L1). The equilibrium and kinetic data were fitted to Redlich–Peterson and Dubinin– Radushkevich models (qm: 960 mg g1) and pseudo-second-order model, respectively. Breakthrough data were predicted by Thomas model. The breakthrough volume was increased by increasing flow rate due to decrease in mass transfer resistance. Adsorbent was regenerated using NaCl solution (4% w/v).
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Design, Modeling and Prototyping a Flat Switched Reluctance Machine for Direct‑Drive Systems
Majid Asgar,Hossein Torkaman,Ebrahim Afei 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.1
In this paper, a fat-type 24 by 16 SRM, is considered for the application of direct-drive washing machine. Firstly, the structure is introduced and using the nonlinear equivalent circuit, the researchers present a design for the SRM. Then, using the three-dimensional fnite element method, the electromagnetic characteristics of the proposed confguration are analyzed to evaluate the motor’s performance. The motor prototype is fabricated and tested experimentally to authenticate the theoretical and simulation analysis, and subsequently to prove the applicability. Finally, the performance of this proposed motor is compared with an SRM that has the same condition. Since a direct drive motor does not require a reduction gear, the drive system can be made simple without harmonic gears, and therefore it can be used in high-precision, more reliable, and low cost appliances.
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New Nonlinear Variable-parameter Muskingum Models
Majid Niazkar,Seied Hosein Afzali 대한토목학회 2017 KSCE Journal of Civil Engineering Vol.21 No.7
The Muskingum model has been widely utilized for flood routing by water resources engineers for decades. Since the relation between channel storage and weighted summation of inflow and outflow seems to be nonlinear, a constant exponent parameter is used to account for this nonlinearity. On the other hand, the nonlinear Muskingum models with constant parameters cannot address variation of Muskingum parameters during flood period. In this paper, fourteen new Muskingum models with variable parameters are proposed. In these models, the routing period is divided into two or three sub-periods and the proposed versions of the Muskingum models can possess parameters with different values in these sub-periods. This capability enhances the Muskingum flood routing approach to better capture the reach characteristics and subsequently improve the routing results. The flood routing results for the selected data set demonstrate that three variable-parameter model reduces the SSQ value more than 89% comparing with the best three constant-parameter Muskingum model in the literature. Additionally, it was concluded that considering x-parameter as a variable parameter during a flood period affects the parameter estimation more than imposing the K- and m-parameters to be variable.
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Majid Ali 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.4
This paper mainly presents the experimental work on studying the effect of post-tensioned coconut-fibre ropes in controlling upliftsof interlocking blocks in mortar-free concrete construction during seismic loadings. Interlocking blocks are capable of returning backto their original positions after the ground motion because of provided inclined key between the blocks. Coconut fibre reinforcedconcrete was used to make interlocking blocks. To simulate a single degree-of-freedom system, a mass of 200 kg is attached at thecolumn top. The seismic response of structure is measured in terms of induced accelerations, block uplift, top relative displacementand rope tension. Generally, induced acceleration is increased up to the column mid-height and then decreased a little bit at thecolumn top. The trends of block uplift and rope tension are somewhat similar i.e. non-linear with respect to the applied incrementalseismic loadings. Empirical relations, as a function of peak ground acceleration, are also developed from the experimental results toenvisage the structure seismic response. There is a percentage difference up to 35% in predicting the structure response which can beattributed towards the complicated nature of the structure versus the simple approach developed. But still, this can help inunderstanding the behaviour of mortar-free interlocking structure having post-tensioned coconut-fibre rope in a systematic manner.
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