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- 저자 : Jianyuan Sun (검색결과 4 건)
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Degree of hydration-based thermal stress analysis of large-size CFST incorporating creep
Jinbao Xie,Jianyuan Sun,Zhi-zhou Bai 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.45 No.2
With the span and arch rib size of concrete-filled steel tube (CFST) arch bridges increase, the hydration heat of pumped mass concrete inside large-size steel tube causes a significant temperature variation, leading to a risk of thermal stressinduced cracking during construction. In order to tackle this phenomenon, a hydration heat conduction model based on hydration degree was established through a nonlinear temperature analysis incorporating an exothermic hydration process to obtain the temperature field of large-size CFST. Subsequently, based on the evolution of elastic modulus based on hydration degree and early-age creep rectification, the finite element model (FEM) model and analytical study were respectively adopted to investigate the variation of the thermal stress of CFST during hydration heat release, and reasonable agreement between the results of two methods is found. Finally, a comparative study of the thermal stress with and without considering early-age creep was conducted.
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Fatigue Behaviour Study of the Shear Stud Using Crack Box Technology and M Integral Method
Jun Xu,Huahuai Sun,Zhenlin Xie,Jianyuan Sun 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.4
Steel and concrete composite structures can give full play to mechanical advantages of the two materials, so it is widely used all over the world. As the key components to ensure the compatibility deformation of two materials, the importance of shear studs to the security of structures is self-evident. However, fatigue research on shear studs is still lagging behind, and there is a potential safety hazard. Thus, based on crack box technique, the M integral and the maximum tangential stress criterion, this paper presents a simulation method for fatigue crack propagation of studs in three-dimensional mixed fracture mode. The crack propagation of Type A fracture in studs is simulated under fatigue load of constant slip between steel and concrete. Results show that the crack defl ection angle of stud increases with slip eff ect. In crack propagation process, the stress intensity factor K I is the highest and K III is the smallest, whose eff ect on the defl ection angle during crack propagation can be reasonably ignored. The crack surface inclines slightly to the bottom of welding collar while the crack expands in the stud.
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Establishment of the Lunar Phase Morphological Classification for Cervical Spinal Canal
Cui Zhongyi,Wang Hongwei,Sun Yuan,Huang Weibo,Zou Fei,Ma Xiaosheng,Lyu Feizhou,Jiang Jianyuan,Wang Hongli 대한척추외과학회 2024 Asian Spine Journal Vol.18 No.1
Study Design: Retrospective clinical trial.Purpose: To establish a morphological classification of the cervical spinal canal using its parameters.Overview of Literature: Cervical spine computed tomography (CT) data of 200 healthy volunteers in 2 years were analyzed. The morphology of the spinal cord was also analyzed.Methods: The median sagittal diameter and transverse diameter of the spinal canal from C2 to C7 were measured on CT images. The ratio of the median sagittal diameter to the transverse diameter was calculated. Accordingly, the spinal canal shape of each segment was classified into four, and the specific criteria of lunar phase classification were determined through linear discriminant analysis based on the ratio of the median sagittal diameter to the transverse diameter. The inter-rater reliability of the classification was explored using Kappa coefficients. Finally, the morphology of the different segments of the cervical spinal canal in healthy volunteers was revised and compared.Results: According to the ratio of the median sagittal diameter and the transverse diameter of the cervical spinal canal, the lunar phase classification of the cervical bony spinal canal was determined as follows: full-moon >0.65, 0.55< convex-moon ≤0.65, 0.46≤ quarter-moon ≤0.55, and residual-moon <0.46. The Kappa values of C2–C7 were 0.851, 0.958, 0.823, 0.927, 0.793, and 0.946, and the Kappa value of all C2–C7 segments was 0.854 that mainly presented two forms of full-moon (76.5%) and convex-moon (23.0%). A quarter-moon spinal canal was mainly distributed in C3, C4, C5, and C6; a residual-moon spinal canal was mainly distributed in C4 and C5; and the morphological distribution of C4 and C5 were similar (<i>p</i>>0.05). The frequency of the spinal canal of the residual-moon type was the highest, and the full-moon (6.5%) and residual-moon (7.5%) types of C7 were rare.Conclusions: The morphological classification of the cervical spinal canal was established to present anatomical variations. The classification showed good inter-rater reliability.
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Fan Gao,Xingpeng Jin,Guicheng Wang,Luying Sun,Yujie Tan,Renxi Zhang,Weixuan Zhao,Jianyuan Hou,Ruina Zhang 대한환경공학회 2023 Environmental Engineering Research Vol.28 No.1
The current paper reports on a newly developed DBD-Mn/FCRB hybrid system to explore the removal of NO<SUB>x </SUB> by reduction without adding reducing gas at low temperature (below 80℃). This technology was established with a fixed carbon-based reduction catalytic reduction bed loaded with manganese (Mn/FCRB) induced by dielectric barrier discharge (DBD). The NO conversion and N₂ selectivity in the new hybrid system reached 90.9 and 79.9%, respectively under 8% oxygen content, 1,200 J/L specific input energy (SIE), which were all higher than in the single DBD and DBD-FCRB systems, respectively. The Mn/FCRB was further characterized before and after activation by SEM, XRD and XPS. The possible reaction pathways of denitration were proposed through three processes based on the experimental results: direct denitration of active carbon atoms excited by plasma, reduction by adsorptive C(N) and C(O) complexes on the FCRB surface, and the reaction of nitrogen oxides with by-product CO. In addition, the results also showed that the new in-situ reduction denitration system had strong oxygen shock resistance and water resistance.
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