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Elastoplastic nonlinear behavior of planar steel gabled frame
Moghaddam, Sina Heyrani,Masoodi, Amir R. Techno-Press 2019 Advances in computational design Vol.4 No.4
In this paper, static nonlinear analysis of gable frame is performed using OpenSees software. Both geometric and material nonlinearities are considered in analyses. To consider large displacements, co-rotational coordinate transformation is used in software. The effects of symmetric and asymmetric support conditions including clamped and simple supports are studied. On the other hand, the material nonlinearity is reflected on analyses using Giuffre-Menegotto-Pinto steel material. Note that strain hardening characteristics are also considered in this model. Moreover, I-shaped cross-section is assumed for all members. The results are provided for different geometry properties of gable frame including shallow and deep inclined roof. It should be added that buckling and post-buckling behaviors of gable frame are investigated using related equilibrium paths. A comparison study is also implemented on the responses of buckling loads obtained for different support and geometry conditions. To trace snap-through paths completely, a displacement control method entitled arc-length is utilized. Findings show the capability of proposed model in nonlinear analysis of gable frames.
Amir R. Masoodi,Sina Heyrani Moghaddam 대한토목학회 2015 KSCE Journal of Civil Engineering Vol.19 No.6
Nonlinear dynamic and natural frequencies of a gabled frame with elastic restraints and semi-rigid connections are investigated by using a program in OpenSees software. Natural frequencies are obtained for two states, which are flexible connections and semi-rigid supports, separately. The mode shapes of structure are also obtained for the described states. Also, the effect of connection flexibility on the dynamic responses of the frame is obtained for different values of peak ground acceleration. The members of this structure are modeled as a nonlinear beam-column element. The members of structure are assumed to be prismatic. Two equal lumped masses at the head of two columns in horizontal and vertical directions are considered as the mass pattern of structure. Note that three degrees of freedom are allocated to all nodes. Furthermore, the mode shapes of frame are obtained. Conclusively, the effects of semi-rigid connections and supports on the natural frequencies and mode shapes of structure are investigated. As results, the top level displacement and base shear responses of frame are reported.
Pushover analysis of gabled frames with semi-rigid connections
Ahmad Shooshtari,Sina Heyrani Moghaddam,Amir R. Masoodi 국제구조공학회 2015 Steel and Composite Structures, An International J Vol.18 No.6
The nonlinear static analysis of structure, which is under the effect of lateral loads and provides the capacity curve of the structure, is defined as a push-over analysis. Ordinarily, by using base shear and the lateral displacement of target point, the capacity curve is obtained. The speed and ease of results interpretation in this method is more than that of the NRHA responses. In this study, the nonlinear static analysis is applied on the semi-rigid steel gabled frames. It should be noted that the members of this structure are analyzed as a prismatic beam-column element in two states of semi-rigid connections and supports. The gabled frame is modeled in the OpenSees software and analyzed based on the displacement control at the target point. The lateral displacement results, calculated in the top level of columns, are reported. Furthermore, responses of the structure are obtained for various support conditions and the rigidity of nodal connections. Ultimately, the effect of semi-rigid connections and supports on the capacity and the performance point of the structure are presented in separated graphs.
Stephen J. Bordes,Sina Zarrintan,Joe Iwanaga,Marios Loukas,Aaron S. Dumont,R. Shane Tubbs 대한해부학회 2021 Anatomy & Cell Biology Vol.54 No.3
We present a rare case of external carotid artery-vertebral artery anastomosis via the ascending pharyngeal artery, diagnosed upon cadaveric dissection. The ascending pharyngeal artery gave rise to a branch to the hypoglossal canal, which is a variation of a true persistent fetal hypoglossal artery. Knowledge of persistent carotid-vertebrobasilar anastomoses is important as these fetal vessels can contribute significantly to the posterior cerebral circulation. Only 10 cases of external carotid artery-vertebrobasilar artery anastomoses have been reported to our knowledge, and our case presents the first cadaveric dissection of this rare variation.
Review of the external carotid plexus: anatomy, function, and clinical manifestations
Shadi E,Razipour,Sina Zarrintan,Mansour Mathkour,Joe Iwanaga,Aaron S,Dumont,R. Shane Tubbs 대한해부학회 2021 Anatomy & Cell Biology Vol.54 No.2
The external carotid plexus is a combination of postganglionic sympathetic fibers derived from the superior cervical ganglion. This plexus travels along the external carotid artery and continues onto the artery’s branches. The external carotid plexus plays an important role in innervating the mid and lower face. Therefore, implications to the plexus may result in facial abnormalities. Herein, we review the anatomy, function, and review its clinical applications.
Taxonomy of the order Mononegavirales: update 2018
Amarasinghe, Gaya K.,Aré,chiga Ceballos, Nidia G.,Banyard, Ashley C.,Basler, Christopher F.,Bavari, Sina,Bennett, Andrew J.,Blasdell, Kim R.,Briese, Thomas,Bukreyev, Alexander,Caì,, Y&iacu Springer-Verlag 2018 Archives of virology Vol.163 No.8