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RISS 인기검색어
- 검색키워드
- 저자 : Mingmin Ding (검색결과 3 건)
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Optimal design of spoke double-layer cable-net structures based on an energy principle
Mingmin Ding,Bin Luo,Lifeng Han,Qianhao Shi,Zhengxing Guo 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.74 No.4
An optimal design method for a spoke double-layer cable-net structure (SDLC) is proposed in this study. Simplified calculation models of the SDLC are put forward to reveal the static responses under vertical loads and wind loads. Next, based on an energy principle, the relationship among the initial prestress level, cross-sectional areas of the components, rise height, sag height, overall displacement, and relative deformation is proposed. Moreover, a calculation model of the Foshan Center SDLC is built and optimized. Given the limited loading cases, material properties of the components, and variation ranges of the rise height and sag height, the self-weight and initial prestress level of the entire structure can be obtained. Because the self-weight of the cables decreases with increasing of the rise height and sag height, while the self-weight of the inner strut increases, the total weight of the entire structure successively exhibits a sharp reduction, a gradual decrease, a slow increase, and a sharp increase during the optimization process. For the simplified model, the optimal design corresponds to the combination of rise height and sag height that results in an appropriate prestress level of the entire structure with the minimum total weight.
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Accumulative Traction Construction Analysis of the FAST Cable-net Structure
Bin Luo,Mingmin Ding,Guorui Xie,Zhengxing Guo 대한토목학회 2018 KSCE Journal of Civil Engineering Vol.22 No.10
Considering the distinctive structural features and complex construction aspects of the five-hundred-meter aperture spherical radio telescope (FAST), this paper proposes the accumulative traction of serial cable construction technology (ATSC). This method makes full use of the guiding function and load-bearing capacity of guide ropes, which are simple and inexpensive, and the setting of catwalks is avoided. The entire ATSC process is divided into several static cases, and the NDFEM form-finding method is introduced to obtain the structural response of each case. Based on the principle of the constant total unstressed length of guide-rope elements, two strategies and a varying multiplication coefficient, λ, are introduced, and the “element length recursive multiplication” strategy is found to excel in terms of the analysis efficiency. Additionally, the total unstressed length of the guide-rope elements is set to three different values to determine the configuration trends. The results show that the most unfavorable configuration of guide ropes exists in initial cases and that the optimal unstressed length of the guide rope lies at an intermediate value between the total unstressed length of the serial main cables and the straight-line distance between the two endpoints of the guide rope for FAST.
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Bin Luo,Yangjie Ruan,Jinfei Li,Mingmin Ding,Haibin Wang 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.3
The cable structure has been widely adopted in some engineering applications. Cable clamp and its anti-slipping performance is the key factor to assure the bearing capacity for cable structure. This paper is concerned with the slipping resistance between cable clamp and Z shape full locked coil cables in a two-way orthogonal cable-net structure. Firstly, a new method for laboratory test of the clamp is designed, which is carried out under cable tension. The clamping force of high-strength bolt and the pushing force are monitored in real time. According to force reaction–displacement graphs obtained from the test, the reasonable anti-slipping ultimate frictional force of the clamp is determined and the precise friction coeffi cient of the clamp is calculated by the data from real-time monitoring. Finally, through the simulation analysis of nonlinear fi nite element model, the results are basically consistent with the laboratory test. The proposed method can be extended to solve anti-slipping problems of similar cable clamps.
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