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- 저자 : Ali Ahani (검색결과 2 건)
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The Effects of Amount and Location of Openings on Lateral Behavior of Masonry Infilled RC Frames
Elshan Ahani,Mir Naghi Mousavi,Ali Ahani,Mohammad Kheirollahi 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.5
Many design codes didn’t consider masonry infills as structural elements inside moment resisting frames. Therefore, their presence is not assumed in analysis and design process. While, in real they could affect strength, energy dissipation, ductility, stiffness and many other features of moment frames. The presence of masonry infills could also change the reaction of frames exposed to lateral loads like earthquake and wind. This issue becomes more important if the built frame was placed in seismically active region. In current study, the effects of opening location by placing openings in 3 different places and its percentage was evaluated. To this purpose an experimental scaled model was constructed and subjected to cyclic loading. Thereafter, by using simplified micromodeling, numerical modeling performed for extending studies. Subsequently, sensitivity analyses were done to survey the effects of opening ratio on the lateral behavior of intermediate RC moment frames. Analytical results indicate that the openings which were lo20cated at upper corner of the masonry infills will loss more strength. In all of the numerical specimens by increase in opening percentage the lateral strength was decreased. The lateral strength was negligible for infills with greater than 40% openings.
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Pulsatility Index in Different Modifications of Fontan Palliation: An Echocardiographic Assessment
Reza Shabanian,Parvin Akbari Asbagh,Abdullah Sedaghat,Minoo Dadkhah,Zahra Esmaeeli,Aliyeh Nikdoost,Manizheh Ahani,Mitra Rahimzadeh,Alireza Dehestani,Mohammad Ali Navabi 한국심초음파학회 2022 Journal of Cardiovascular Imaging (J Cardiovasc Im Vol.30 No.2
BACKGROUND: Adding pulsation to the Fontan circulation might change the fate of patients palliated by this procedure. Our aim was to compare the pulsatility index (PI) of the pulmonary artery (PA) between the various modifications of Fontan palliation. METHODS: Doppler-derived PI was measured in PA branches of a cohort of 28 patients palliated by 6 modifications of Fontan procedure. A group of normal individuals was included for comparison. RESULTS: Atriopulmonary connection (APC) group had the highest PA branches PI and statistically was close to the PI of the normal individuals (right pulmonary artery [RPA] PI of 1.58 vs. 1.63; p = 0.99 and left pulmonary artery [LPA] PI of 1.54 vs. 1.68; p = 0.46, respectively). The lowest PA branches PI was seen in the group of extracardiac total cavopulmonary connection (RPA PI of 0.62 and LPA PI of 0.65). Other 4 modifications including the extracardiac conduit with oversewn pulmonary valve, extracardiac conduit with preserved adjusted antegrade flow, extracardiac conduit from inferior vena cava onto the rudimentary right ventricle and lateral tunnel had a mean “RPA and LPA” PI of “1.19 and 1.17”, “1.16 and 1.11”, “1.13 and 1.11”, “0.82 and 0.84”, respectively. The modified Dunnett's post hoc test has shown a significant statistical decline in PI of all modifications compared to the normal individuals except for the APC group. CONCLUSIONS: Fontan palliated patients in different groups of surgical modification showed a spectrum of Doppler-derived PI with the highest amounts belong to the groups of pulsatile Fontan.
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