The Tang Dynasty Wall

Hua WEI 한국색채학회 2015 International Invitation Exhibition of Color Works Vol.2015 No.-

Study on strength of reinforced concrete filled circular steel tubular columns

Hua, Wei,Wang, Hai-Jun,Hasegawa, Akira,Shioi, Yukitake,Iwasaki, Shoji,Miyamoto, Yutaka Techno-Press 2005 Structural Engineering and Mechanics, An Int'l Jou Vol.19 No.6

Concrete filled steel tubular columns (CFT) are widely used in civil engineering works, especially in large scale of works because of high strength, deformation, toughness and so on. On the other hand, as a kind of strengthening measure for seriously damaged reinforced concrete piers of viaduct in Hansin-Awaji earthquake of Japan in 1995, reinforced concrete piers were wrapped with steel plate. Then, a new kind of structure appeared, that is, reinforced concrete filled steel tubular column (RCFT). In this paper, compression test and bending-shearing test on RCFT are carried out. The main parameters of experiments are (1) strength of concrete, (2) steel tube with or without rib, (3) width-thickness ratio and (4) arrangement of reinforcing bars. According to the experimental results, the effect of parameters on mechanical characteristics of RCFT is analyzed clearly. At the same time, strength evaluation formula for RCFT column is proposed and tested by experimental results and existed recommendations (AIJ 1997). The strength calculated by the proposal formula is in good agreement with test result. As a result, the proposed evaluation formula can evaluate the strength of RCFT column properly.

Mitigation of wind-induced vibrations of bridge hangers using tuned mass dampers with eddy current damping

Huawei Niu,Zhengqing Chen,Xugang Hua,Wei Zhang 국제구조공학회 2018 Smart Structures and Systems, An International Jou Vol.22 No.6

To mitigate vibrations, tuned mass dampers (TMD) are widely used for long span bridges or high-rise buildings. Due to some durability concerns, such as fluid degradation, oil leakage, etc., the alternative solutions, such as the non-contacted eddy current damping (ECD), are proposed for mechanical devices in small scales. In the present study, a new eddy current damping TMD (ECD-TMD) is proposed and developed for large scale civil infrastructure applications. Starting from parametric study on finite element analysis of the ECD-TMD, the new design is enhanced via using the permanent magnets to eliminate the power need and a combination of a copper plate and a steel plate to improve the energy dissipation efficiency. Additional special design includes installation of two permanent magnets at the same side above the copper plate to easily adjust the gap as well as the damping. In a case study, the proposed ECD-TMD is demonstrated in the application of a steel arch bridge to mitigate the wind-induced vibrations of the flexible hangers. After a brief introduction of the configuration and the installation process for the damper, the mitigation effects are measured for the ambient vibration and forced vibration scenarios. The results show that the damping ratios increase to 3% for the weak axis after the installation of the ECD-TMDs and the maximum vibration amplitudes can be reduced by 60%.

SERVICE-ORIENTED ARCHITECTURE EXPANDS THE WEB-BASED INTERACTIVE EDUCATION SYSTEM

Huawei Zhai,Weishi Zhang,Licheng Cui,Ganna Liu 한국멀티미디어학회 2006 한국멀티미디어학회 국제학술대회 Vol.2006 No.-

This paper introduces the process of using net in teaching course of 'foundation of multimedia application', and stresses on the research, development and application instances of the network education system, finally it shows a service-oriented architecture of the net teaching system, in order to integrate heterogeneous net teaching resource quickly and conveniently.

Development of an immunochromatographic strip for detection of antibodies against porcine reproductive and respiratory syndrome virus

Huawei Li,Jifei Yang,Dengke Bao,Jie Hou,Yubao Zhi,Yanyan Yang,Pengchao Ji,Enmin Zhou,Songlin Qiao,Gaiping Zhang 대한수의학회 2017 Journal of Veterinary Science Vol.18 No.3

A simple and rapid immunochromatographic test strip incorporating a colloidal gold-labeled recombinant Nsp7 antigen probe was successfully developed for the detection of anti-porcine reproductive and respiratory syndrome virus (PRRSV) antibodies in swine. Recombinant Nsp7 protein of PRRSV labeled with colloidal gold was dispensed on a conjugate pad for use as the detector. Staphylococcal protein A and purified porcine anti-Nsp7 antibodies were blotted on a nitrocellulose membrane to form test and control lines, respectively. A comparison of the strip with standard diagnostic tests, enzyme-linked immunosorbent assays and immunoperoxidase monolayer assay, was also performed. The immunochromatographic test strip was shown to be of high specificity and sensitivity. Furthermore, the strip assay is rapid and easy to perform with no requirement for professional-level skills or equipment. It is suggested that the immunochromatographic test strip can be used to quickly and accurately detect PRRSV antibody and to be suitable for diagnostic purposes in the field.

Feedback Design of Temperature Control Measures for Concrete Dams Based on Real-Time Temperature Monitoring and Construction Process Simulation

Huawei Zhou,Yihong Zhou,Chunju Zhao,Fang Wang,Zhipeng Liang 대한토목학회 2018 KSCE Journal of Civil Engineering Vol.22 No.5

Crack prevention is a significant issue in the construction process of concrete dams. The vast majority of concrete cracks arerelated to temperature variations, and hence, temperature control is a primary method used to prevent cracks. This paper presents anew integrated concept, named Feedback Design (FD) of temperature control measures, which incorporates real-time temperaturemonitoring, temperature field simulation and construction process simulation in a large system to optimize a temperature controlscheme for concrete dams. We used a fiber-optic Distributed Temperature Sensing (DTS) system to monitor the temperaturevariation process of typical dam monoliths in real time. By incorporating a genetic algorithm, neural network algorithm, and finiteelement theory, we proposed an intelligent inversion method to obtain thermal parameters of concrete dams based on the temperaturemonitoring data. Meanwhile, we built a simulation model of a concrete dam’s construction process based on a cycling networktechnique to obtain accurate construction environmental parameters. Finally, we simulated the temperature field of a typical dammonolith based on initial temperature control measures, inversion thermal parameters, and accurate construction environmentalparameters. Temperature variance lines of typical points in the model obtained from the finite element method (FEM) accord wellwith the measured values obtained from the DTS system. We applied the FD approach to the Xiluodu arch dam located in southwestChina to forecast the temperature fields and optimize the temperature control scheme of the dam blocks planned for pouring. The FDapproach has been proven reliable and efficacious.

Temperature Field Reconstruction of Concrete Dams based on Distributed Optical Fiber Monitoring Data

Huawei Zhou,Zhiguo Pan,Zhipeng Liang,Chunju Zhao,Yihong Zhou,Fang Wang 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.5

Mastering the real temperature distribution of the concrete dam is the basis for solving the problem of temperature control and crack prevention. In this paper, Distributed Temperature Sensing (DTS) technology was applied to temperature monitoring of a higharch dam under construction in southwest China. In order to obtain a more comprehensive temperature distribution of the dam, optical fiber layout principles for arch dams were studied, and horizontal and vertical optical fiber layout schemes were first proposed according to these principles. The real temperature variation processes of the dam were obtained in real time with a line temperature measurement pattern instead of a point temperature measurement pattern. Additionally, a framework of distributed optical fiber data acquisition and remote transmission was proposed. Interconnection of multiple DTS hosts and remote transmission of temperature data were realized. Then, two-dimensional temperature fields of a typical dam block in different ages and longitudinal profiles of dam blocks with embedded fibers were reconstructed based on large amounts of temperature monitoring data and the Kriging difference algorithm. Temperature field reconstruction results showed that the temperature distribution law of the concrete arch dam was in accordance with the actual situation.

An empirical model for amplitude prediction on VIV-galloping instability of rectangular cylinders

Huawei Niu,Zhengqing Chen,Xugang Hua,Shuai Zhou 한국풍공학회 2015 Wind and Structures, An International Journal (WAS Vol.21 No.1

Aerodynamic forces of vortex-induced vibration and galloping are going to be coupled when their onset velocities are close to each other, which will induce the cross-wind amplitudes of the structures increased continuously with ever-increasing wind velocities. The main purpose of the present work is going to propose an empirical formula to predict the response amplitude of VIV-galloping interaction. Firstly, two typical mathematical models for the coupled oscillations, i.e., Tamura & Shimada model and Parkinson & Corless model are comparatively summarized. Then, the key parameter affecting response amplitude is determined through comparative numerical simulations with Tamura & Shimada model. For rectangular cylinders with the side ratio from 0.5 to 2.5, which are actually prone to develop the VIV and galloping induced interaction responses, an empirical amplitude prediction formula is proposed after regression analysis on comprehensively collected experimental data with the predetermined key parameter.

Capacity assessment of existing corroded overhead power line structures subjected to synoptic winds

Huawei Niu,Xuan Li,Wei Zhang 한국풍공학회 2018 Wind and Structures, An International Journal (WAS Vol.27 No.5

The physical infrastructure of the power systems, including the high-voltage transmission towers and lines as well as the poles and wires for power distribution at a lower voltage level, is critical for the resilience of the community since the failures or nonfunctioning of these structures could introduce large area power outages under the extreme weather events. In the current engineering practices, single circuit lattice steel towers linked by transmission lines are widely used to form power transmission systems. After years of service and continues interactions with natural and built environment, progressive damages accumulate at various structural details and could gradually change the structural performance. This study is to evaluate the typical existing transmission tower-line system subjected to synoptic winds (atmospheric boundary layer winds). Effects from the possible corrosion penetration on the structural members of the transmission towers and the aerodynamic damping force on the conductors are evaluated. However, corrosion in connections is not included. Meanwhile, corrosion on the structural members is assumed to be evenly distributed. Wind loads are calculated based on the codes used for synoptic winds and the wind tunnel experiments were carried out to obtain the drag coefficients for different panels of the transmission towers as well as for the transmission lines. Sensitivity analysis is carried out based upon the incremental dynamic analysis (IDA) to evaluate the structural capacity of the transmission tower-line system for different corrosion and loading conditions. Meanwhile, extreme value analysis is also performed to further estimate the short-term extreme response of the transmission tower-line system.

Effect of Fe<SUP>2+</SUP>/Fe<SUP>3+</SUP> ions on the stabilization of arsentic by biogenic Mn oxides in contaminated soils

Huawei WANG,Yi SONG,Ying-Jie SUN 대한환경공학회 2019 대한환경공학회 학술발표논문집 Vol.2019 No.-