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RISS 인기검색어
- 검색키워드
- 저자 : Arash Nouri (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Experimental and numerical analyses of perforated corrugated steel shear walls
Gholamreza Nouri,Arash Rayegani,Fariba Nemati,Gholam Hossein Eftekhar 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.12
This study presents an evaluation of the seismic performance of corrugated steel shear walls (CSSWs) with openings. Cyclic experimental tests were conducted on CSSW specimens featuring square and circular openings, with a comparison made to infill CSSWs. Additionally, numerical analysis was performed to investigate various opening configurations. The results indicate that CSSWs with openings experienced a maximum strength reduction of approximately 10% when compared to infill walls. Furthermore, placing the opening at the center of the wall resulted in an elastic stiffness decrease of approximately 23%. The presence of openings also mitigated the pinching effect observed in cyclic responses. The numerical analysis further revealed that incorporating stiffeners around the openings significantly enhanced the seismic performance of CSSWs. Stiffened openings demonstrated improvements of approximately 38% in ultimate strength, 26% in stiffness, 25% in ductility reduction factor, and 15% in equivalent viscous damping ratio when compared to unstiffened openings. To further investigate the practical application, the study numerically evaluated 3-story frames with perforated CSSWs under monotonic loading. The analysis demonstrated the beneficial impact of opening stiffeners, as stiffened openings exhibited increased ductility, loading capacity, initial stiffness, and response behavior factor of approximately 13.5%, 9.0%, 20.5%, and 30%, respectively, when compared to unstiffened perforated CSSWs. Overall, this study contributes to the understanding of the seismic behavior of CSSWs with openings and highlights the advantages of incorporating stiffeners around the openings to enhance their structural performance.
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A developed model predictive control scheme for vibration attenuation of building structures
Afshin Bahrami Rad,Mahdi Nouri,Javad Katebi,Seyyed Arash Mousavi Ghasemi 국제구조공학회 2021 Smart Structures and Systems, An International Jou Vol.27 No.4
Model predictive control (MPC) is an optimal control algorithm in which the current control action is obtained by solving an optimization problem in the presence of hard and soft constraints in the finite time horizons sequentially. In most cases, neglecting the effects of the external loads in predicting the future responses of the structures lead to inaccurate control action. Therefore, it could be beneficial to consider the effects of external loads in the future within the MPC to improve its accuracy. In this paper, a developed model predictive control (DMPC) scheme is introduced. For this purpose, a forecasting seismic excitation model is formulated by two sequential autoregressive (AR) models. One of those estimates the future output of the seismic excitation and the second one enhances the estimation accuracy. Then, the efficiency of the presented approach is demonstrated by the numerical study of two benchmark buildings equipped with an active tuned mass damper (ATMD). The performance of the proposed MPC is finally compared with the conventional and ideal MPCs. The numerical outputs prove the competency and higher conformity of the proposed MPC with the ideal one almost in all of the cases. Twelve benchmark performance indices are also utilized for determining the superiority of the method. The average conformity values for all of the performance indices for the proposed method in the three- and nine-story buildings are by up to 17.75% and 9% more than the values in conventional one, respectively.
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Maryam Tehranchi,Ferial Taleghani,Shahriar Shahab,Arash Nouri 대한영상치의학회 2017 Imaging Science in Dentistry Vol.47 No.1
Purpose: Insufficient knowledge of the anatomy of the maxillary sinuses prior to sinus graft surgery may lead to perioperative or postoperative complications. This study sought to characterize the position of the posterior superior alveolar artery (PSAA) within the maxillary sinuses using cone-beam computed tomography (CBCT). Materials and Methods: A total of 300 patients with edentulous posterior maxillae, including 138 females and 162 males with an age range of 33-86 years, who presented to a radiology clinic between 2013 and 2015 were enrolled in this retrospective cross-sectional study. The distance from the inferior border of the PSAA to the alveolar crest according to the residual ridge classification by Lekholm and Zarb, the distance from the PSAA to the nasal septum and zygomatic arch, and the diameter and position of the PSAA were all assessed on patients’ CBCT scans. The data were analyzed using the Mann-Whitney test and the t-test. Results: The PSAA was detected on the CBCT scans of 87% of the patients; it was located beneath the sinus membrane in 47% of cases and was intraosseous in 47% of cases. The diameter of the artery was between 1 and 2 mm in most patients (72%). The mean diameter of the artery was 1.29±0.39 mm, and the mean distances from the PSAA to the zygomatic arch, nasal septum, and alveolar crest were 22.59±4.89 mm, 26.51±3.52 mm, and 16.7±3.96 mm, respectively. Conclusion: The likelihood of detecting the PSAA on CBCT scans is high; its location is intraosseous or beneath the sinus membrane in most patients. Determining the exact location of the PSAA on CBCT scans preoperatively can help prevent it from being damaged during surgery.
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Tehranchi, Maryam,Taleghani, Ferial,Shahab, Shahriar,Nouri, Arash Korean Academy of Oral and Maxillofacial Radiology 2017 Imaging Science in Dentistry Vol.47 No.1
Purpose: Insufficient knowledge of the anatomy of the maxillary sinuses prior to sinus graft surgery may lead to perioperative or postoperative complications. This study sought to characterize the position of the posterior superior alveolar artery (PSAA) within the maxillary sinuses using cone-beam computed tomography (CBCT). Materials and Methods: A total of 300 patients with edentulous posterior maxillae, including 138 females and 162 males with an age range of 33-86 years, who presented to a radiology clinic between 2013 and 2015 were enrolled in this retrospective cross-sectional study. The distance from the inferior border of the PSAA to the alveolar crest according to the residual ridge classification by Lekholm and Zarb, the distance from the PSAA to the nasal septum and zygomatic arch, and the diameter and position of the PSAA were all assessed on patients' CBCT scans. The data were analyzed using the Mann-Whitney test and the t-test. Results: The PSAA was detected on the CBCT scans of 87% of the patients; it was located beneath the sinus membrane in 47% of cases and was intraosseous in 47% of cases. The diameter of the artery was between 1 and 2 mm in most patients (72%). The mean diameter of the artery was $1.29{\pm}0.39mm$, and the mean distances from the PSAA to the zygomatic arch, nasal septum, and alveolar crest were $22.59{\pm}4.89mm$, $26.51{\pm}3.52mm$, and $16.7{\pm}3.96mm$, respectively. Conclusion: The likelihood of detecting the PSAA on CBCT scans is high; its location is intraosseous or beneath the sinus membrane in most patients. Determining the exact location of the PSAA on CBCT scans preoperatively can help prevent it from being damaged during surgery.
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