Form-finding of tensioned fabric structure in the form of Enneper minimal surface has been investigated. Computational form-finding is frequently used to investigate the possible forms of uniformly stressed surfaces. In this study, two parameter of Enneper minimal surface was used in this study are u and v = 0.4 and 1.2. This study provides an alternative choice for engineer to consider the Enneper minimal surface, u = v = 0.4 and 1.2 to be applied in tensioned fabric structure.
Abstract-Tensioned fabric structure in the form of Enneper minimal surface can be considered as a sustainable development for the green environment and technology, it also can be used to support the effectiveness used of energy and the structure. Sustainable development of tensioned fabric green structure in the form of Enneper minimal surface has been studied. The combination of shape and internal forces for the purpose of stiffness and strength is an important feature of fabric surface. For this purpose, form-finding using nonlinear analysis method has been carried out for Enneper minimal surface models with variables u=v=0.6 and u=v=1.0. Pattern of prestress in the resulting fabric surface has been studied. Enneper minimal surface models with variables u=v=0.6 and u=v=1.0 with fabric type A provides an alternative choice for practicing engineers to consider the tensioned fabric green structure in the form of Enneper minimal surface applied in the construction industry. It is expected to reduce the construction cost, shorten the construction time and improve the construction quality.Index Terms-Tensioned fabric structure, minimal surface, form-finding.
Abstract. Form-finding has to be carried out for tensioned fabric structure in order to determine the initial equilibrium shape under prescribed support condition and prestress pattern. Tensioned fabric structures are normally designed to be in the form of equal tensioned surface. Tensioned fabric structure is highly suited to be used for realizing surfaces of complex or new forms. However, research study on a new form as a tensioned fabric structure has not attracted much attention. Another source of inspiration minimal surface which could be adopted as form for tensioned fabric structure is very crucial. The aim of this study is to propose initial equilibrium shape of tensioned fabric structures in the form of Chen-Gackstatter. Computational form-finding using nonlinear analysis method is used to determine the Chen-Gackstatter form of uniformly stressed surfaces. A tensioned fabric structure must curve equally in opposite directions to give the resulting surface a three dimensional stability. In an anticlastic doubly curved surface, the sum of all positive and all negative curvatures is zero. This study provides an alternative choice for structural designer to consider the Chen-Gackstatter applied in tensioned fabric structures. The results on factors affecting initial equilibrium shape can serve as a reference for proper selection of surface parameter for achieving a structurally viable surface.
The codoped ZnO thin film were deposited by DC magnetron sputtering on silicon (111) followed by annealing treatment at 400 °C and 600 °C for 1 hour in nitrogen and oxygen gas mixture. Structural investigation was carried out by scanning electron microscopy (SEM) and X ray diffraction (XRD). Film roughness (r.m.s) and grain shape were found to be correlated with the annealing temperatures. SEM result has shown that its surface characteristics are strongly influenced by annealing temperatures.
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