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RISS 인기검색어
- 검색키워드
- 저자 : Changyu Xu (검색결과 4 건)
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Changyu Xu,Lijun Han 대한토목학회 2023 KSCE JOURNAL OF CIVIL ENGINEERING Vol.27 No.1
This study proposes the Test-simulation Method to investigate the formation mechanism of slurry consolidated body in different grouting media under dynamic water conditions, which utilizes the test system to study the basic laws, and the numerical simulation to reveal the mechanism. Firstly, a test system for grouting under dynamic water conditions was developed, which can be used to grout in both porous media and parallel-fissure media. And the effects of water velocity and grouting rate on the slurry-consolidated-body forms were studied by this test system. Secondly, COMSOL Multiphysics was used to simulate the test process, and shapes of the consolidated body in numerical simulation were analyzed and compared with those in the model test, which proved the feasibility of the numerical method. Finally, the variation law of two-phase flow velocity during the grouting process was further studied by numerical simulation, in order to reveal the formation mechanism of the consolidated body. The results show that the slurry consolidated body presents an approximate ‘Fusiform’ shape in the porous medium, while presents a ‘U-shape’ in the parallel-fissure medium. And the final form of the slurry consolidated body is constructed with the joint action of water velocity and grouting rate.
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Xu Jiang,Qing-Tian Su,Xu Han,Changyu Shao,Liang Chen 한국강구조학회 2017 International Journal of Steel Structures Vol.17 No.3
A new-type of orthotropic steel-concrete composite bridge deck system was developed, by casting the concrete overlay on the top of the orthotropic steel deck ribbed with T-shape steel members. To study its mechanical behavior (in terms of failure mode, load-deflection relationship, concrete crack initiation and propagation, strength, stiffness and so on), two new-type orthotropic steel-concrete composite bridge decks with different section dimensions were experimentally investigated and two reference decks (reinforced concrete deck and orthotropic steel deck) were also involved in the research for comparison. For the two new-type orthotropic steel-concrete composite decks, the average value of ultimate loads per width is 885.7kN, which is 2.35 and 1.61 times of that of the concrete and steel reference decks with almost the same section height. Experimental results proved that the composite deck can effectively control the crack initiation and propagation in the concrete and postpone the yielding of the steel bars and steel plates, due to the composite action between the concrete overlay and the underlying steel plate. Furthermore, the Finite Element (FE) model of the orthotropic steel-concrete composite deck was developed and validated by test results. A parametric study is conducted regarding to the stiffness of shear studs. With the validated FE model, stress distribution in the underlying steel plate and T-shape stiffeners and development of concrete cracking in the concrete overlay were characterized at different load levels.
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ChangYu Xia,Ou Liu,LanZhen Wang,GuoBing Xu 대한진단검사의학회 2012 Annals of Laboratory Medicine Vol.32 No.4
Background: Commutable reference materials (RMs) are suitable for end-users for evaluating the metrological traceability of values obtained using routine measurement systems. We assessed the performance of 6 routine measurement systems with validated secondary RMs. Methods: We tested the homogeneity, stability, and commutability of 5 minimally processed human serum pools according to the standard guidelines. The serum pools were assigned values as per the reference procedure of the United States Centers for Disease Control and were used to evaluate the trueness of results from 6 commercial measurement systems based on enzymatic methods: 3 glucose oxidase (GOD) and 3 hexokinase (HK) methods. Results: The prepared RMs were validated to be sufficiently homogenous, stable, and commutable with the patient samples. Method bias varied for different systems: GOD01, -0.17 to 2.88%; GOD02, 1.66 to 4.58%; GOD03, -0.17 to 3.14%; HK01, -3.48 to -0.85%; HK02, -3.83 to -0.11%, and HK03, -1.82 to -0.27%. Conclusions: We observed that the prepared serum glucose RMs were qualified for trueness assessment. Most of the measurement systems met the minimal quality specifications. Background: Commutable reference materials (RMs) are suitable for end-users for evaluating the metrological traceability of values obtained using routine measurement systems. We assessed the performance of 6 routine measurement systems with validated secondary RMs. Methods: We tested the homogeneity, stability, and commutability of 5 minimally processed human serum pools according to the standard guidelines. The serum pools were assigned values as per the reference procedure of the United States Centers for Disease Control and were used to evaluate the trueness of results from 6 commercial measurement systems based on enzymatic methods: 3 glucose oxidase (GOD) and 3 hexokinase (HK) methods. Results: The prepared RMs were validated to be sufficiently homogenous, stable, and commutable with the patient samples. Method bias varied for different systems: GOD01, -0.17 to 2.88%; GOD02, 1.66 to 4.58%; GOD03, -0.17 to 3.14%; HK01, -3.48 to -0.85%; HK02, -3.83 to -0.11%, and HK03, -1.82 to -0.27%. Conclusions: We observed that the prepared serum glucose RMs were qualified for trueness assessment. Most of the measurement systems met the minimal quality specifications.
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