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Study on the improvement of water resistance of magnesium phosphate cement by steel slag

IOP Conference Series: Materials Science and engineering 2018年第1期409卷

作者： Mengyang Xie Zhanguo Li Yue Li Zigeng Wang The Key Laboratory of Urban Security and Disaster Engineering MOE Beijing Key Lab of Earthquake Engineering and Structural Retrofit Beijing University of Technology Beijing 100124 PR China.

Steel slag powder was used as a mixed material of magnesium phosphate cement (MPC) to improve its mechanical water resistance. The mechanism of steel slag on MPC was studied through the composition and microstructure test of MPC hydration products. The results showed that the strength of magnesium phosphate cement gradually decreased with the increase of immersion time after adding steel slag. Adding 15% steel slag could improve the water resistance of MPC, make the structure compact and reduce the strength loss rate.

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Effect of Air Entraining Agent on Uniaxial Tensile Properties of PVA-ECC

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IOP Conference Series: Materials Science and engineering 2018年第1期409卷

作者： Jincai Zhu Zigeng Wang Yue Li Zhanguo Li The Key Laboratory of Urban Security and Disaster Engineering MOE Beijing Key Lab of Earthquake Engineering and Structural Retrofit Beijing University of Technology Beijing 100124 PR China.

In this paper, polyvinyl alcohol (PVA) fiber reinforced ECC (Engineered Cementitious Composites) mortar was selected as the research object. The effect of air entraining agent on the tensile properties of PVA-ECC was studied by uniaxial tensile test with different dosages. The results showed that the tensile strength reduced by adding air entraining agent. When the amount of fly ash increased with adding a large amount of air entraining, the tensile strain reduced. In addition, the tensile strain of the cementitious material with no fly ash increased when incorporating air entraining agent.

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Research on gas diffusion model and experimental diffusion characteristic of cylindrical coal

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Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology 2017年第5期46卷 1033-1040页

作者： Li, Zhiqiang Cheng, Qiang Liu, Yanwei Duan, Zhengpeng Song, Dangyu State Key Laboratory of Coal mine Disaster Dynamics and Control Chongqing University Chongqing400030 China Henan Polytechnic University JiaozuoHenan454000 China MOE Engineering Center of Mine Disaster Prevention and Rescue Henan Polytechnic University JiaozuoHenan454000 China Henan Provincial Key Lab of Gas Geology and Control-Cultivation Base of Provincial and Ministry Joint State Key Henan Polytechnic University JiaozuoHenan454000 China

Under various temperatures and pressures, the gas diffusion experiments were carried out with Φ50 mm×100 mm standard cylindrical coal samples. At the same time, a gas diffusion experiment was carried out by use of the particles of the same coal as comparative experiment. To describe the gas diffusion in cylindrical coal samples, the cylindrical diffusion model was established and the analytical solution of diffusion rate was derived. The results show that the gas diffusion in cylindrical raw coal is slower than that in coal particles. And the cumulative diffusion quantity and diffusivity in cylindrical raw coal is far less than those in coal particles under the same time. The diffusion coefficient of cylindrical raw coal is 11.72 times as much as that of coal particles. This is because that the cylindrical row coal contains a larger pore and fissure diamaters. But the effective diffusion coefficient of cylindrical raw coal is 1.82% of which in coal particles. That results from the extension of the diffusion path and the increase of the tortuosity. These lead the cylindrical coal core to contain a smaller capacity of release gas. © 2017, Editorial Board of Journal of CUMT. All right reserved.

关键词： Coal

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Backscattered electron imaging and image analysis technology for determining the fly ash content in hardened cement mortar 6th

Backscattered electron imaging and image analysis technology...

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6th Annual Meeting on Testing and Evaluation of Advanced Materials, TEIM 2015

作者： Li, Yue Dong, Wanguo Yang, Jinbo Guo, Wei Key Laboratory of Urban Security and Disaster Engineering MOE Beijing University of Technology Beijing100124 China Beijing Key Lab. of Earthquake Engineering and Structural Retrofit Beijing University of Technology Beijing100124 China

ISBN: (纸本)9783038357278

Determining the content of fly ash (FA) in hardened cement concrete is very difficult at present. In this paper, samples were prepared with water/binder ratio (0.4), different FA/binder ratios and different curing ages, the backscattered electron imaging and image analysis technology are used to study the dosage of FA in the hardened cement mortar. The results show that the backscattered electron imaging and image analysis technology can comparable accurately test the dosage of FA in hardened cement mortar;this method doesn't need to know the chemical composition of raw materials or prepare the standard reference samples. © 2016 Trans Tech Publications, Switzerland.

关键词： Fly ash

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INTERFACIAL BEHAVIOR OF PIPE JOINTS UNDER TORSION LOADS

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Acta Mechanica Solida Sinica 2015年第5期28卷 521-535页

作者： Jun Han Hong Yuan Jiayu Wu MOE Key Lab of Disaster and Control in Engineering Institute of Applied Mechanics Jinan University

The interfacial behavior of pipe joints is studied in this paper. Firstly, through nonlinear fracture mechanics, the analytical expressions of interfacial shear stress and the load- displacement relationship at loaded end of pipe joints under torsion loads are obtained. Thus the shear stress propagation and the debonding process of the whole interface for different bond lengths can be predicted. Secondly, through the analytical solutions, the influences of different bond lengths on the load-displacement curve and the ultimate load are studied. The stress trans- fer mechanism, the interface crack propagation and the ductility behavior of the joints can be explained.

关键词： interface failure mechanism softening debonding torsion pipe joints

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Thermal-structural Coupling Analysis of PCBA System

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IOP Conference Series: Materials Science and engineering 2018年第2期452卷

作者： Wei Su Junhua Zhu Renhuai Liu Zhiyuan He Scienceand Technology on Reliability Physics and Application Technology of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou China Department of Mechanics and Civil Engineering Jinan University Guangzhou China

In this paper, the thermal and structural analysis of the PCBA system is provided by using the 3-D ANSYS package. The results of thermal and structural analysis for complex and simple model are compared. The paper also describes the deformation analysis of the PCBA system components, and the weak components sensitive to thermal stress are determined though thermal-structual analysis. The results of thermal analysis are helpful to the optimizing overall arrangement design of PCBA system.

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New damage-sensitive feature for structures with bolted joints

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Journal of Physics: Conference Series 2017年第1期842卷

作者： W F Luo L Yu School of Mechanics and Construction Engineering Jinan University Guangzhou 510632 China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou 510632 China

Compared with riveted and welded joints, bolted joints have advantages of easily dismantled, high load carrying and load-transferring capacity. However, bolted joints are also weaker components of assembled structures. structural damage detection (SDD) on bolted joints is much required in the field of structural health monitoring (SHM). A new SDD method is proposed for damage identification of structures with bolted joints based on residual error of AR model in time series analysis. Firstly, a new data standardization process is defined to maintain the information of damage location. Then, a new structural damage feature sensitive to structural damage is developed based on the standard deviation of AR model residual errors. To verify the proposed method, a bolted joint structure is designed and fabricated in laboratory, connection damages of structures are simulated by loosening the bolted joints. The acceleration responses of structures with bolted joints under healthy and damage cases are acquired. Finally, the SDD is performed by traditional DSF and the new DSF. The illustrated results show that the proposed method is a hybrid tool for the bolted joint damage detection with the new damage-sensitive feature. In addition, some related issues will be discussed as well.

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Moving force identification based on particle swarm optimization

Moving force identification based on particle swarm optimiza...

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International Conference on Fuzzy Systems and Knowledge Discovery (FSKD)

作者： Huanlin Liu Ling Yu Department of Mechanics and Civil Engineering Jinan University Guangzhou China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou China

ISBN: (纸本)9781509040940

Moving force is very important for bridge design, structural analysis and structural health monitoring. Some studies on moving force identification (MFI) attract extensive attentions in the past decades. A novel two-step MFI method is proposed based on particle swarm optimization (PSO) and time domain method (TDM) in this study. The new proposed MFI method includes two steps. In the first step, the PSO is used to identify the constant loads without matrix inversion. In the second step, the conventional TDM is employed to estimate the rest time-varying loads where the Tikhonov regularization and general cross validation (GCV) are introduced to improve the MFI accuracy and to select optimal regularization parameters, respectively. A simply supported beam bridge subjected to moving forces is taken as a numerical simulation example to assess the performance of the proposed method. The illustrated results show that the new two-step MFI method can more effectively identify the moving forces compared to the conventional TDM and the improved Tikhonov regularization method, the proposed new method can provide more accurate MFI results on two moving forces under eight combinations of bridge responses.

关键词： Bridges Force Time division multiplexing Acceleration Particle swarm optimization Time-domain analysis Numerical simulation

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Identification of joint equivalent parameters via combining PSO with FE model updating

Identification of joint equivalent parameters via combining ...

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International Conference on Fuzzy Systems and Knowledge Discovery (FSKD)

作者： Wenfeng Luo Ling Yu Department of Mechanics and Civil Engineering Jinan University Guangzhou China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou China

ISBN: (纸本)9781509040940

In this study, the finite element (FE) model updating method and particle swarm optimization (PSO) algorithm are combined to identify joint equivalent parameters by converting the inverse problem into an optimization problem. First, the natural frequency and frequency response function (FRF) of assembled structures are regarded as an index of the dynamic characteristics. The objective function is defined by minimizing index relative errors between FE model and assembled structures. And then the PSO algorithm is used to solve the optimization problem. The noise effect on the method is also considered. The illustrated numerical simulation results show that the proposed method can identify the equivalent parameters with a good robustness to noises as well as with a high efficiency.

关键词： Fasteners Linear programming Mathematical model Heuristic algorithms Computational modeling Algorithm design and analysis Damping

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Mechanical Deformation Mechanism of Fiber Reinforced Composites T-joints

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IOP Conference Series: Materials Science and engineering 2017年第1期207卷

作者： Wei Su Ke-qiang Cheng Ren-huai Liu Shi-qing Huang Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou China Department of Mechanics and Civil Engineering Jinan University Guangzhou China

In this paper, we focus on the need for ideal theory analytical solution of mechanical deformation mechanism for T-joints. Through removing unnecessary constraints, stress equivalence system of T-joints can be established by force method. Solution equations of unknown nodal forces and the total vertical displacement can also be obtained, and this result can be used to evaluate strength of FRC T-joints.

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