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Jialiang Li,Donghui Ma 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.2
To research the failure characteristics on the extraordinarily fire explosion accident which happened in Tianjin Port, through detailed site investigation and related numerical calculation, a new formula of the shock wave overpressure which can be used in near field and far field are proposed, and the formula was contrasted and validated with the actual damage. Finally, according to the explosive power and the distance from explosive source, the damaging range is divided into different damage levels. In this paper, some salient characteristics of the fire explosion accident are discovered and discussed. The results indicates that this model can depict the damage situation well in near field and far field and it can supplement and revise the planning on earthquake resistance and hazardous prevention.
Jialiang Li,Fei Chen,Jinye Niu,Ying Yang,Zhihao Wang 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.3
In this study, α-Si3N4 ceramics were successfully prepared using MgO and AlPO4 as the sintering additives and a low temperature spark plasma sintering (SPS) technique. The resultant α-Si3N4 ceramics sintered from 1300 oC to 1500 oC show a fine microstructure with nearly no grain growth and phase transformation. The dielectric properties of the sintered ceramics are investigated in detail. α-Si3N4 ceramics with a porosity of 5-36% show a dielectric constant of 4.5-7.4 and a dielectric loss of less than 10 × 10−3. The existence of AlPO4 performing as a binder not only contributes to the low temperature sintering of fully-dense α-Si3N4 ceramics, but also reduces the dielectric constant and loss.
Jialiang Wang,Dilei Qian,Yang Sun,Fenfei Peng 한국유체기계학회 2022 International journal of fluid machinery and syste Vol.15 No.2
Drilling sampling technology is an important means for obtaining underground physical data and evaluating mineral reserves. The coring diamond bit is located in the front of the drilling equipment, which can reflect the drilling efficiency and core recovery of the bit when drilling into the coring. In order to improve the drilling efficiency and core recovery, a design scheme of diamond bit for seafloor drills is proposed, which combines the formation characteristics of the seafloor within 300 meters. Based on the fluid dynamics theory and considering the effect of bit rotation on the flow field at the hole-bottom, the effects of bit water passage structure and drilling parameters on the flow field are analyzed. The results show that the designed bit can avoid the core erosion by 80% of the drilling fluid. The rotary speed should be controlled at 250 - 330 rpm, and the pump displacement should be 50 - 60 L/min. When the drilling fluid is up-return along the hole wall, the velocity first rises and then drops, then stabilizes between 0.8 - 1.3 m/s, which meets the range requirements for the standard cuttings up-return and the stability of the hole wall. Finally, the rationality of the bit design scheme is verified by field drilling experiments. The average core recovery percent reaches 85 %, which is about 25% higher than the conventional bit of water passage system.
Effect of Stirrup Corrosion and Fire on Shear Behavior of Reinforced Concrete Beams
Jialiang Liu,Jijun Miao,Guangzhong Ba,Jiangzhuang Xiao,Dongshuai Hou 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.9
This article presents an investigation on corrosion damage effects on the shear bearing capacity of reinforced concrete (RC) beams after a fire. Accelerated corrosion tests were conducted using four RC beams designed with corrosion crack widths ranging from 0.1 mm to 0.3 mm to simulate an aggressive corrosion-prone environment. One control beam (B1) did not undergo accelerated corrosion. The fire test was conducted separately on each beam for two hours to explore how the different widths of corrosive cracks affect heat propagation at elevated fire-induced temperatures. A residual capacity test determined the effects of corrosion on the beams’ residual shear strength after a fire. The experimental results showed that corrosion cracks accelerate the heat propagation in concrete during a fire; moreover, the post-fire residual shear strength for corroded RC beams slightly decreased with an increasing degree of corrosion on the stirrups. The authors also developed a corresponding simplified calculating method to determine residual shear strength, which showed shear design provisions that could improve some existing codes.
Jialiang Kou,Lingling Li,Junping Shi 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.4
Uniaxial compression on high ductile concrete after erosion by different concentrations of sulfate solutions was conducted. The compressive strength, mass change fraction, corrosion resistance coefficient and other parameters on the basic mechanical properties of high ductile concrete is studied. The erosion form and uniaxial compression failure characteristics of the samples was analyzed. And using scanning electron microscope to observe the microscopic morphology of the samples, it is found that sulfate and age accelerate the damage to high ductile concrete, with its damage mechanism revealed. The test results are as follows: with the increase of age, the compressive strength and quality of high ductile concrete in 5%, 10% and saturated sulfate solution will increase first and then decrease; the mass change fraction of high ductile concrete is greater than that of ordinary concrete, it has the characteristics of self-compacting before the erosion age of 270 days, Then, as the sulfate solution concentration increases, the damage of the high ductile concrete becomes more serious. The comparison test with ordinary concrete shows that high ductile concrete has higher resistance to sulfate attack. This research can provide experimental basis for the application of high ductile concrete in engineering under sulfate corrosion environment.
jialiang Zhang,Wang Wenchun,Ma Tengcai,chang Tan,younian Wang 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
This paper presents the research on the optical emission spectra (OES) of the secondary plasma formed on the surface of a polyethylene target by high intensity pulsed ion beams (HIPIB) produced in the TEMP-II accelerator of our laboratory. It can be veried from the OES that the secondary plasma is mainly composed of H, C, C2and CH species. The temporal proles of some spectral lines of the species, recorded by a SP305 spectrometer with a TEKTRONIX TDS3052 500 MHz storage oscilloscope, are investigated under the typical running conditions of the TEMP-II. The average standing time of the secondary plasma is evaluated from the 30 s temporal proles when the HIPIB has a energy density of 4 J/cm2 and a duration of 75 ns. The forming time of the secondary plasma is also about 30 s, which equals to the average delay of the spectral emission pulses relative to the trigger pulse of the HIPIBs.