Artificial-Neural-Network-Based Mechanical Simulation Prediction Method for Wheel-Spoke Cable Truss Construction

Zhansheng Liu,Antong Jiang,Wenyuan Shao,Anshan Zhang,Xiuli Du 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.3

Cable force monitoring is an important step in cable truss structural health monitoring. Considering cost eff ectiveness, the accuracy and quality of safety assessments depend primarily on the usage of reasonable cable monitoring programs. Many monitoring methods have been proposed to design the cable truss structure. The emergence of artifi cial neural network (ANN) models has resulted in improved predictive abilities. In this study, an ANN-based model is used to estimate parameter changes in static and prestress loss tests during the construction of a cable truss. The fi nite element model data of 243 cases are analysed by ANSYS and MATLAB. Analysis results indicate the excellent prediction performance as well as high accuracy and generalization of the proposed ANN-based model. Furthermore, the successfully trained ANN-based model is used to predict new cases. As an alternative to fi nite element analysis and physical test, the proposed model can guide the static loading of the spoke cable truss structure and thus allow the safe usage of the structure during service.

Experimental Study on Residual Mechanical Properties of Bolt-Sphere Joints After a Fire

Hongbo Liu,Zhilun Tan,Zhihua Chen,Zhansheng Liu,Dongyu Liu 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.3

Through tensile testing of 15 steel bolt-sphere joints and 15 aluminum alloy bolt-sphere joints, infl uencing rules of material type, high temperature and cooling mode on tensile properties of post-fi re bolt-sphere joints were studied, and then failure modes of the joints were determined. According to experimental data, the calculation formula of residual tension capacity of post-fi re bolt-sphere joints was presented. Experimental data indicated that (1) decreased extension on the mechanical properties of aluminum alloy bolt-sphere joints after high temperature in the fi re was signifi cantly higher than that of the steel bolt-sphere joints; (2) when fi re temperature was lower than 800 °C, the tension capacity of steel bolt-sphere joints could be restored by more than 90% after cooling; (3) when fi re temperature was lower than 500 °C, the tension capacity of aluminum alloy bolt-sphere joints could be restored by more than 50% after cooling; (4) bolt-sphere joints could still satisfy the requirement of “strong node and weak member” after a fi re; and (5) material type and fi re temperature were the main factors that infl uenced post-fi re mechanical properties of bolt-sphere joints.

Comparison study of naphthalene adsorption on activated carbons prepared from different raws

Pengyun Liu,Zhansheng Wu,Zhonghai Sun,Jun Ye 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.10

Five activated carbons (ACs) from apricot shells (ACAS), mixture of lignin and cellulose (ACLC), wood (ACW), walnut shells (ACWS), and coal (CAC) were prepared and used as adsorbents to study the adsorption behavior of naphthalene. All ACs were characterized by scanning electron microscopy, N2 adsorption-desorption method, Xray photoelectron spectroscopy, and elemental analysis. The effects of initial concentration, contact time, ionic strength, pH, and temperature on the adsorption of ACs for naphthalene were examined. Results show that CAC exhibit higher micropore specific surface area and contain more C-O bond than other ACs. Except for ACW, CAC is the least polar or the most hydrophobic adsorbent among ACs. This finding may be helpful in the formation of hydrogen bonding between CAC and naphthalene. The adsorption quantity of CAC was 227.03mg g1 at 303K, which was considerably higher compared with that of other ACs. The kinetics process of naphthalene on all ACs was controlled by pseudo-second-order kinetic model. The adsorption equilibrium of naphthalene on ACs was reached at 40min. The adsorption isotherms of naphthalene to ACs were consistent with the Freundlich isotherm model. The result of thermodynamic analysis shows that the adsorption occurs spontaneously. Moreover, the higher starting naphthalene concentration and lower adsorption temperature significantly can enhance the adsorption capacity of CAC. The maximum adsorption value of naphthalene on ACs was also observed at pH 4 under the same conditions. Moreover, the increase in ionic strength slightly promotes the adsorption of naphthalene on ACs. The microporous structure, element content and surface functional group of ACs affect its adsorption capacity.

Microwave-assisted modification of activated carbon with cationic surfactants for enhancement of naphthalene adsorption

Zhonghai Sun,Zhansheng Wu,Dandan Liu,Xiufang He 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.2

Polycyclic aromatic hydrocarbons (PAHs) are toxic pollutants harmful to humans. To improve the adsorption capacity of PAHs on activated carbon (AC) from the aqueous system, AC was modified with cationic surfactants through microwave heating. Naphthalene is a typical PAH used as a model pollutant to test the adsorption properties of sample; the sample with the best adsorption performance was named SAC. The SAC was characterized by SEM, FTIR and BET in detail compared with AC. The specific surface area and the average pore size of SAC increased by nearly 100m2 g−1 and 0.14 nm more than the original AC, respectively. The adsorption experiment was carried out by batch technique with variables such as contact time, adsorbent amount, pH and temperature. Results showed that naphthalene was adsorbed rapidly during the first 20min, and thereafter reached adsorption equilibrium in 40 min. The adsorption kinetics of naphthalene on SAC can be well described by the pseudo-second-order model and the Freundlich isotherm model better fitted the adsorption isotherms of naphthalene on SAC. Naphthalene adsorption process on SAC was spontaneous and temperature was found to negatively affect the adsorption capacity. Furthermore, film diffusion was confirmed the rate limiting step. The π-π stacking electron donor acceptor interaction, hydrophobic interaction and hydrogen bonding may play more key roles in naphthalene adsorption on SAC than AC. Thus, microwave- assisted surfactants modification was proven to be an effective method to enhance the adsorption of naphthalene onto SAC from aqueous solution.

Developing an Integrated BIM+GIS Web-Based Platform for a Mega Construction Project

Linlin Zhao,Jasper Mbachu,Zhansheng Liu 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.4

Construction projects are usually characterised by their large scale, complicated technologies, long periods of time to complete, and challenging collaboration efforts. The provision of digital representations that combine physical properties with geospatial information can help to solve some of these problems. Thus, the current study proposes a novel approach of integrating building information modelling (BIM) into the geographic information system (GIS) domain as a way of combining micro- and macro-level information into a unified domain without needing to convert between data standards or use any intermediate format. Moreover, this study provides an approach to automatic geo-referencing of the BIM model in the GIS domain without prior knowledge of the corresponding points. Based on the proposed integration approach, an integrated BIM+GIS web-based platform was developed that allows various stakeholders access to project information from different geographical areas, thereby enhancing information sharing and facilitating project management. To evaluate the functions and feasibility of the developed platform, it was employed for managing a mega construction project. The results indicate that the process of integrating BIM into the GIS domain was accurate and effective, and the developed platform can help to properly manage a mega-project by providing the required information and functions.

Enhanced carrier transport and visible light response in CA-β-CD/g-C3N4/Ag2O 2D/0D heterostructures functionalized with cyclodextrin for effective organic degradation

Xue Li,Tingting Liu,Fei Tian,Xiyang Tao,Zhansheng Wu 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.11

The high cost and low carrier separation efficiency of g-C3N4/Ag2O photocatalysts affect its application in the degradation of organic pollutants. In this study, the CA-βCD/g-C3N4/Ag2O 2D/0D heterojunction photocatalysts were successfully prepared to enhance the visible light response and inhibit the electron-hole recombination simultaneously during pollutant degradation. The 10:1:1 CA-βCD/g-C3N4/Ag2O showed the outstanding photochemical catalysis performance for the degradation of organic pollutants. The degradation efficiency of methyl orange, reactive black and norfloxacin was 2.53, 1.92 and 1.14 times than that of 1:1 g-C3N4/Ag2O. In addition, 10:1:1 CA-β-CD/g-C3N4/Ag2O also showed excellent photocatalytic stability. The free radical scavenging experiment and electron spin resonance proved that ·O − 2 was the chief active specie in the degradation process. The mechanism research results showed that the formation of heterojunction improved the utilization rate of sunlight and promoted the separation efficiency of photo-generated electrons and holes, which significantly advanced the photocatalytic activity of the composite catalyst. The preparation of CA-βCD/g-C3N4/Ag2O provided ideas for modification of photocatalyst by macromolecular organic matter.

Analytical modeling of axial stiffness of tensile bolted joints under concentric external load

Peng He,Jiaxin Liu,Chengyuan Zhang,Zhansheng Liu 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.11

Stiffness of bolted joints is a critical parameter for determining deformations and natural frequencies of assemblies. In this study, the effect of external load on axial stiffness of bolted joints is clarified theoretically for the first time. The stiffness of stress zones between and beyond load planes is derived on the basis of the strain energy method and used to formulate the stiffness of bolted joints. The influence of the distance between the load planes of the external load, axial positions of the external load, and difference in the material of the clamped parts on the stiffness of the bolted joints are investigated by applying the proposed formulations and finite element method. Comparisons with finite element results indicate that the proposed formulation can accurately predict the stiffness of the bolted joints.

Electronic structure and optical properties for blue phosphorene/ graphene-like GaN van der Waals heterostructures

Jingjing Guo,Zhongpo Zhou,Tianxing Wang,Zhansheng Lu,Zongxian Yang,Chang Liu 한국물리학회 2017 Current Applied Physics Vol.17 No.12

In this paper, first-principle calculations based on density functional theory are carried out to explore the interface properties of the blue phosphorene/graphene-like GaN van der Waals heterostructures. The edge positions for valence and conduction band of blue phosphorene and graphene-like GaN nanosheets change with the Fermi energy level and form the type-II heterostructure. The internal electric field facilitates the separation of electronhole pairs and restrained the carrier recombination in the blue phosphorene/graphene-like GaN interfaces.

Structure and magnetic properties of CrN thin films on La0.67Sr0.33MnO3

Zhongpo Zhou,Dingbo Zhang,Haiying Wang,Tianxing Wang,Zhansheng Lu,Zongxian Yang,Zhiwei Ai,Hao Wu,Chang Liu 한국물리학회 2018 Current Applied Physics Vol.18 No.11

High crystalline quality CrN thin films have been grown on La0.67Sr0.33MnO3 (LSMO) templates by molecular beam epitaxy. The structure and magnetic properties of CrN/LSMO heterojunctions are investigated combining with the experiments and the first-principles simulation. The Nėel temperature of the CrN/LSMO samples is found to be 281 K and the saturation magnetization of CrN/LSMO increases compared to that of LSMO templates. The magnetic property of CrN/LSMO heterostructures mainly comes from Cr atoms of (001) CrN and Mn atoms of (001) LSMO. The (001) LSMO induces and couples the spin of the CrN sublattice at CrN/LSMO interface.