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Factors Influencing Bond Properties in Concrete Encased Steel Columns at High Temperatures
Yuzhuo Wang,Ziqing Liu,Guoqiang Li,Jian Jiang,Ying Gao,Chuanguo Fu 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.3
This paper presents experimental results on factors governing the bond strength between steel and concrete in concrete encased steel (CES) columns at high temperatures. Push-out tests were conducted on 22 CES specimens to investigate the bond strength between concrete and steel under the temperature of 250 °C, while one specimen was tested at room temperatures for comparison. Data obtained from these tests revealed that the bond properties of CES structures between steel and concrete is infl uenced by a number of factors, including concrete strength, concrete cover thickness, stirrup reinforcement ratio, steel ratio and anchorage length of steel at high temperatures. The formulas for predicting the ultimate bond strength and slip between steel and concrete of CES structures are proposed based on the experimental investigations.
Study on preparation and characterization of uniform bismuth nanospheres
Nianjing Ji,Ziqing Li,Yang Chen,Jiyang Wang,Xiulan Duan,Huaidong Jiang 한양대학교 세라믹연구소 2018 Journal of Ceramic Processing Research Vol.19 No.5
The uniform and monodisperse bismuth nanospheres were successfully prepared by simple and convenient solvothermalmethod. The bismuth nitrate was reduced by ethylene glycol at 150-200 oC for 20-30 hrs. The nanospheres were characterizedby powder X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The dispersivity of bismuthnanospheres was investigated using optical microscope. The optimum reaction conditions to prepare the uniform bismuthnanospheres with a narrow diameter range was investigated. The results indicate that the monodisperse bismuth nanospheresprepared at 200 oC possess sizes ranging from 100-200 nm. The formation mechanism of the bismuth nanospheres washypothesized.
Moyan Zhang,Hong Xiao,Jiaqi Wang,Shuwei Fang,Ziqing Jiang 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.8
Excessive fastener spacing, which results from construction errors (the bridge construction error and the track layout error) and environment temperature, is a possible safety risk for train and track structure. To address this problem, this paper selected a CRTSIII ballastless track-bridge section as the engineering case, and established a thermal-mechanical trackbridge coupling model. The maximum fastener spacing was calculated based on the model, and the dynamic and static characteristics of train and track under the different fastener spacing were compared. The results show that under the combination of construction errors and ambient temperature, the most unfavorable fastener spacing is 755 mm; with the increase in fastener spacing, the longitudinal resistance of fasteners first reaches the limit in the static safety indexes; the rail vertical dynamic displacement first reaches the limit in the dynamic safety indexes. Therefore, maximum fastener spacing of CRTSIII ballastless track structure depends on railway operation and maintenance, train speed and local environment.