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RISS 인기검색어
- 검색키워드
- 저자 : Renzhang Yan (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Calculation Theory and Experimental Study of the K6 Single-layer Reticulated Shell
Renzhang Yan,Zhihua Chen,Xiaodun Wang,Xiao Xiao,Yuan Yang 한국강구조학회 2014 International Journal of Steel Structures Vol.14 No.2
A new approach named Cross-Section Method, based on membrane force transfer mechanism, for calculating internal forcesof diagonal members in a single-layer reticulated shell is presented in this paper. Relevant problems in the process of calculatingthe internal force by Cross-Section Method are elaborated, including determination of geometric parameters of a K6 singlelayerreticulated shell, establishment of equilibrium equations and analogy methods for calculating stiffness of spring supports. Stiffness matrixes of link members and the overall structure in spherical coordinates are derived based on spatial position ofeach member in a K6 single-layer reticulated shell. Static experiments under full-span loads and half-span loads with a 1/10scale model of a K6 single-layer reticulated shell, adopted in a stadium located in Chiping, Shandong, were conducted. Adetailed contrast of results obtained through experiments, Cross-Section Method and FEM is presented. The internal forcecalculated by Cross-Section Method is close to FEM results, thus verifying the membrane force transfer mechanism andapplicability of Cross-Section Method in the single-layer reticulated shell. Though experimental errors are inevitable due tocorrosion of some members in the model, experimental results show approximately the same tendency. Also, the results suggestthat the structural behavior under half-span loads is more unfavorable compared with full-span loads.
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A new equivalent friction element for analysis of cable supported structures
Renzhang Yan,Xiaodun Wang,Zhihua Chen,Hongbo Liu,Xiao Xiao 국제구조공학회 2015 Steel and Composite Structures, An International J Vol.18 No.4
An equivalent friction element is proposed to simulate the friction in cable-strut joints. Equivalent stiffness matrixes and load vectors of the friction element are derived and are unified into patterns for FEM by defining a virtual node specially to store internal forces. Three approaches are described to verify the rationality of the new equivalent friction element: applying the new element in a cable-roller model, and numerical solutions match well with experimental results; applying the element in a continuous sliding cable model, and theoretical values, numerical and experimental results are compared; and the last is applying it in truss string structures, whose results indicate that there would be a great error if the cable of cable supported structures is simulated with discontinuous cable model which is usually adopted in traditional finite element analysis, and that the prestress loss resulted from the friction in cable-strut joints would have adverse effect on the mechanical performance of cable supported structures.
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Renzhang Yan,Chunling Yan,Shuai Wang,Chongsheng Cheng,Ting Liu,Hongbo Liu 한국강구조학회 2023 International Journal of Steel Structures Vol.23 No.1
During the tensioning process of the cable-supported structure, the sliding friction between cable wires and joint will have a great influence on the mechanical properties of the structure. However, due to the complex structure of the cable and the combined action of bending deformation and large pre-tension at the cable-strut joint, it is difficult to accurately determine the coefficient of sliding friction (CSF) between cable wires and joint, and thus the overall mechanical properties of the structure cannot be accurately evaluated. Based on the twisting characteristics of the cable, this paper establishes a friction-slip test model and a refined numerical model to carry out detailed study of the mechanical behavior of contact between cable wires and joint during the tensioning process. Firstly, combined with the calculation results of contact mechanics, it is finds that the stress distribution at straight and curved sections of the cable are non-uniform along its axis and each cross section, and the non-uniformity coefficient of the internal force distribution of the cable is further quantified. At the same time, the local bending of the cable will intensify the uneven stress distribution in the circumferential direction of the cable. The non-uniformity of stress reveals the contact working mechanism of the cable-joint pair. Then, the change of the prestress loss between cable wires and joint with the tensioning process is analyzed, and the parametric analysis is conducted to reveal the effect of the cable included angle, tensile force, and lay length on the CSF. The results find that the prestress loss increases approximately linearly with the increase of tension force and decreases with the increase of the cable included angle, but the CSF is less affected by the lay length during the tensioning process. Finally, a method for valuing the CSF of the cable-supported structure is developed.
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Zhongwei Zhao,Bing Liang,Renzhang Yan 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.5
Suspen-dome structures are extensively used due to their superiority over traditional structures. The friction between cable and joints may severely infl uence the distribution of cable force, especially during the pre-stressing construction period. An accurate and effi cient numerical method has not yet been developed that can be used for estimating the infl uence of friction on cable force distribution. Thus, this study proposes an effi cient friction element to simulate friction between cable and joint. A fl owchart for estimating the value of friction force is introduced. These novel numerical methods were adopted to estimate the infl uence of friction on cable force distribution. The accuracy and effi ciency of these numerical methods were validated through numerical tests.
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