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Fangfang Geng,Youliang Ding,Hongen Xie,Jianyong Song,Wanheng Li 국제구조공학회 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.52 No.1
A three-dimensional finite element model for the Jiashao Bridge, the longest multi-span cablestayed bridge in the world, is established using the commercial software package ANSYS. Dynamic characteristics of the bridge are analyzed and the effects of structural system measures including the rigid hinge, auxiliary piers and longitudinal constraints between the girders and side towers on the dynamic properties including modal frequency, mode shape and effective mass are studied by referring to the Jiashao Bridge. The analysis results reveal that: (i) the installation of the rigid hinge significantly reduces the modal frequency of the first symmetric lateral bending mode of bridge deck. Moreover, the rigid hinge significantly changes the mode shape and effective mass of the first symmetric torsional mode of bridge deck; (ii) the layout of the auxiliary piers in the side-spans has a limited effect on changing the modal frequencies, mode shapes and effective masses of global vibration modes; (iii) the employment of the longitudinal constraints significantly increases the modal frequencies of the vertical bending modes and lateral bending modes of bridge deck and have significant effects on changing the mode shapes of vertical bending modes and lateral bending modes of bridge deck. Moreover, the effective mass of the first anti-symmetric vertical bending of bridge deck in the longitudinal direction of the fully floating system is significantly larger than that of the partially constrained system and fully constrained system. The results obtained indicate that the structural system measures of the multi-span cable-stayed bridge have a great effect on the dynamic properties, which deserves special attention for seismic design and wind-resistant design of the multi-span cable-stayed bridge.
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Geng, Fangfang,Ding, Youliang,Xie, Hongen,Song, Jianyong,Li, Wanheng Techno-Press 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.52 No.1
A three-dimensional finite element model for the Jiashao Bridge, the longest multi-span cable-stayed bridge in the world, is established using the commercial software package ANSYS. Dynamic characteristics of the bridge are analyzed and the effects of structural system measures including the rigid hinge, auxiliary piers and longitudinal constraints between the girders and side towers on the dynamic properties including modal frequency, mode shape and effective mass are studied by referring to the Jiashao Bridge. The analysis results reveal that: (i) the installation of the rigid hinge significantly reduces the modal frequency of the first symmetric lateral bending mode of bridge deck. Moreover, the rigid hinge significantly changes the mode shape and effective mass of the first symmetric torsional mode of bridge deck; (ii) the layout of the auxiliary piers in the side-spans has a limited effect on changing the modal frequencies, mode shapes and effective masses of global vibration modes; (iii) the employment of the longitudinal constraints significantly increases the modal frequencies of the vertical bending modes and lateral bending modes of bridge deck and have significant effects on changing the mode shapes of vertical bending modes and lateral bending modes of bridge deck. Moreover, the effective mass of the first anti-symmetric vertical bending of bridge deck in the longitudinal direction of the fully floating system is significantly larger than that of the partially constrained system and fully constrained system. The results obtained indicate that the structural system measures of the multi-span cable-stayed bridge have a great effect on the dynamic properties, which deserves special attention for seismic design and wind-resistant design of the multi-span cable-stayed bridge.
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Research on a Dynamic E-commerce System based on Middleware Technology and Web Service
Changai Chen,Fangfang Geng,Jiayun Zhang,Yu Zhao 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.9
With the continuous development of information technology and the growing popularity of the Internet, the E-commerce system based on the traditional distributed technology has exposed more and more problems and the development of dynamic E-commerce system has become the target of the next generation of E-commerce. Middleware technology is the trend of the development of software, which is famed and the software developing fastest. So the middleware technology is used to develop the E-commerce system in order to propose a new generation dynamic E-commerce system. Several key techniques J2EE architecture and MVC design pattern are introduced. Then a service-oriented architecture(SOA) and a service-oriented dynamic E-commerce system based on middleware technology and web services are researched and designed. Web services can provide exchange of information and system integration for dynamic E-commerce, support more complex types of web interaction and collaboration. J2EE technology and MVC design pattern can simplify the software development, improve the software performance and quickly construct the dynamic E-commerce system with the good expansibility, maintainability, dependability and high usability.
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An architecture of lifecycle fatigue management of steel bridges driven by Digital Twin
Jiang, Fei,Ding, Youliang,Song, Yongsheng,Geng, Fangfang,Wang, Zhiwen Techno-Press 2021 Structural monitoring and maintenance Vol.8 No.2
The fatigue of steel bridges poses a great threat to their safety and functionality. However, current approaches for fatigue management are largely based on heuristic design philosophies, physical testing, and bridge managers' experience. This paper proposes a closed lifecycle fatigue management driven by Digital Twin for steel bridges. To provide clarity around the concept, the definition of Digital Twin for steel bridges is given at first. Then eight functional modules supporting Digital Twin are outlined in detail, aiming to provide a reference for the future development of Digital Twin in fatigue management. Finally, the implementation mechanism of Digital Twin is further described over different phases during the bridge lifecycle. This paper also identifies two main obstacles for the development of Digital Twin: i) the lack of understanding of steel bridge fatigue, and ii) the insufficiency of the present technologies.
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