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- 저자 : Dongzhi Yang (검색결과 6 건)
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Experimental Evaluation of Precast Concrete Beam-Column Connections with High-strength Steel Rebars
Dongzhi Guan,Zhengxing Guo,Cheng Jiang,Sen Yang,Hui Yang 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.1
A novel precast concrete beam-column connection partially reinforced with high-strength steel rebars of a yield strength greater than 630 MPa was introduced to avoid reinforcement obstruction in connection zones. Reversed cyclic loadings were applied to fullscale specimens to evaluate their seismic performance. For the first precast specimen, high-strength steel rebars acted as bottom longitudinal bars of the beams. For the second precast specimen, high-strength steel rebars were used as both bottom longitudinal bars and embedded bars that were anchored into the joint. The results show that the new precast connection exhibits a satisfactory seismic resistance. The anchored embedded bars are not necessary in the new system for a limited improvement in the structural performance. The mechanical equilibrium of the rectangular stress block method can be applied to estimate the strength of the new connection using the design philosophy of strong column-weak beam.
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Development of miniature bar-type structural fuses with cold formed bolted connections
Dongzhi Guan,Sen Yang,Liang-Jiu Jia,Zhengxing Guo 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.34 No.1
A novel all-steel miniature bar-type structural fuse (MBSF) with cold formed bolted connections is developed in this study, which consists of a central energy dissipation core cut from a smooth round bar, an external confining tube and nuts. Three types of cross sections for the central energy dissipation core, i.e., triple-cut, double-cut and single-cut cross sections, were studied. Totally 18 specimens were axially tested under either symmetric or asymmetric cyclic loading histories, where the parameters such as cut cross sectional area ratio, length of the yielding portion and cross sectional type were investigated. Numerical simulation of 2 representative specimens were also conducted. An analytical model to evaluate the bending failure at the elastic portion was proposed, and a design method to avoid this failure mode was also presented. The experimental results show that the proposed MBSFs exhibit satisfactory hysteretic performance under both the two cyclic loading histories. Average strain values of 8% and 4% are found to be respectively suitable for designing the new MBSFs as the ultimate strain under the symmetric and asymmetric cyclic loadings.
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Experimental and numerical studies of miniature bar-typed structural fuses with Teflon pads
Sen Yang,Yan Liu,Yu Lin,Dongzhi Guan,Hanbin Ge,Zhengxing Guo,Wenguang Liu 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.41 No.4
Many studies have proved that structural fuses could improve the seismic performance of structures efficiently. A structural fuse named the miniature bar-typed structural fuse (MBSF) has been proposed and investigated by the authors, which consists of a central core bar, a confining tube. To further improve the mechanic performances of the MBSFs under compressive loadings, Teflon pads are introduced to adjust the contact and friction status between the core bar and the confining tube. Three groups of specimens were discussed including the specimen with a single cutting line (SC), the specimen with double cutting lines (DC), and the specimen with triple cutting lines (TC). The results show that the hysteretic performances of the fuses are improved with the help of Teflon pads. The compression strength adjustment factor declines when Teflon pads are appended. Numerical and theoretical analyses are also conducted which expounded the effect of the Teflon pads. Different plastic buckling deformation principles of the core bars are compared by the theoretical analysis. It is shown that Shanley’s theory fits the numerical results well, which is recommended for the theoretical calculation of the proposed MBSFs.
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Jianbing Yang,Kefeng Ni,Dongzhi Wei,Yuhong Ren 한국생물공학회 2015 Biotechnology and Bioprocess Engineering Vol.20 No.5
Ni2+-functionalized Fe3O4@polydopamine magnetic nanoparticles (Ni2+-PD-MNPs) were designed and synthesized by in situ coating of magnetic nanoparticles with polydopamine, followed by conjugation of Ni2+ to the polydopamine film. The Ni2+-PD-MNPs were used to purify His-tagged red fluorescent protein (His-RFP) via affinity interaction between Ni2+ and the His-tag. The results showed that the Ni2+-PD-MNPs had extraordinary selectivity for His-RFP purification. In addition, a Histagged transaminase (ω-transaminase BJ110) was selectively immobilized onto the Ni2+-PD-MNPs without purification, and the immobilized enzyme showed improved specific activity, as well as enhanced stability and reusability.
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A Heterogeneous IoT Node Authentication Scheme Based on Hybrid Blockchain and Trust Value
( Shiqiang Zhang ),( Yang Cao ),( Zhenhu Ning ),( Fei Xue ),( Dongzhi Cao ),( Yongli Yang ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.9
Node identity authentication is an essential means to ensure the security of the Internet of Things. Existing blockchain-based IoT node authentication schemes have many problems. A heterogeneous IoT node authentication scheme based on an improved hybrid blockchain is proposed. Firstly, the hybrid blockchain model is designed to make the blockchain and IoT environment more compatible. Then the proxy node selection mechanism is intended to establish a bridge between the ordinary IoT node and the blockchain, building by calculating the trust value between nodes. Finally, based on the improved hybrid blockchain, the node authentication scheme of the model and proxy node selection mechanism establishes a secure connection for communication between nodes. Safety and performance analysis shows proper safety and performance.
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Qisi Lin,Ling Zhang,Dongzhi Yang,Zhao Chunjie 한국식품영양과학회 2014 Journal of medicinal food Vol.17 No.6
This study describes the characterization of essential oil and phenolic compounds in Disporopsis pernyi (Hua) Diels. The essential oil was analyzed by gas chromatography-mass spectroscopy (GC-MS) and twelve volatile bioactive compounds of D. pernyi were identified. Polyphenols were identified by reverse-phase high-performance liquid chromatography (RP-HPLC) coupled to electrospray ionization time-of-flight mass spectrometry (ESI-TOF-MS) and quantified by ultrahigh-performance liquid chromatography (UPLC). A total of 4 polyphenolic compounds found in extract were identified as rutin, luteolin, quercetin, and betulinic acid. All obtained extracts and the 4 polyphenolic compounds were evaluated for their antimicrobial and antioxidant properties. The results suggested that the phenolic compounds contributed significantly to the antioxidant and antimicrobial activities of the plant.
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