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https://opaj.napstic.cn/periodicalArticle/downloadReview/0120120807175121
利用ANSYS软件对ETFE气枕结构进行找形分析,考虑预应力和内压两个控制因素,给出了三角形、四边形和六边形气枕的找形结果,并推导了四边形和圆形气枕找形的解析式。编制了计算气枕体积的MATLAB程序,并与ANSYS软件联合应用,计算了矩形气枕结构在7种荷载工况下的变形和膜面的应力分布。通过参数分析,得到了膜面应力和矢高、膜厚、矢跨比之间的关系,提出了气枕合理的膜厚、矢跨比,并给出了不同跨度气枕充压建议值,最后对ETFE气枕结构的蒙皮效应进行了研究。研究结果表明:膜面初始预应力宜介于5~8 MPa;ETFE膜厚可根据气枕跨度选择单层0.2 mm或双层0.4 mm,矢跨比0.1左右,成形后膜面最大、最小应力分别位于中心区、角点区;ETFE气枕充压的初始内压介于250~1 150 MPa,充压值随跨度增大而减小;初始内压500 Pa常用尺寸(4 m×5 m矩形)的气枕,可抵抗大小与内压相当的正负风压、均布和半跨雪荷载和偶然集中荷载,但在超载工况下,需对气枕充气加压方可继续工作;ETFE气枕具有明显的蒙皮效应。
Considering the two key factors, i.e. the prestressing force and internal pressure, the form-finding results of triangular, rectangular and hexagonal ETFE cushions were obtained by ANSYS software. The theoretical formulae of rectangular and circular cushions were derived. A MATLAB program for calculating cushion' s volume was written and then used with ANSYS together to analyze the deformation and stress distribution in the foil of a rectangle cushion under 7 load cases. The parameters such as the rise, foil thickness and rise-to-span ratio of cushion were investigated, and the relationships between stress distribution and the rise, foil thickness and rise-to-span ratio of the cushion were obtained. The reasonable foil thickness and rise-to-span ratio were proposed and inflating pressure values for cushions with deferent span were suggested. Finally, the diaphragm effect of ETFE cushion was researched. Some conclusions for ETFE cushion design are drawn by the study of this paper. Initial prestressing stress of ETFE foil should be within 5 - 8 MPa. Foil thickness should be one layer 0.2 mm or two layers 0.4 mm based on the span of the cushion. The cushion rise-to-span ratio should be about 0.1. After the formation of the cushion, the maximum stress is in the central area and the minimum stress is in the corner area. The cushion' s initial inflating pressure value is within 250 1 150 MPa, which will decrease with the increase of span. A common span(4 m x 5 m) ETFE cushion with the initial internal pressure of 500 Pa can resist normal positive and negative wind pressures, uniform and half-span snow load, and occasionally concentrated load. But under overloading conditions, the cushion needs to be inflated to keep working. ETFE cushion has a significant diaphragm effect.
顾磊;王鹏;武芳
哈尔滨工业大学深圳研究生院,广东深圳518055哈尔滨工业大学深圳研究生院,广东深圳518055/大连城建设计研究院有限公司,辽宁大连116012深圳华森建筑与工程设计顾问有限公司,广东深圳518054
建筑与水利
ETFE气枕找形有限元分析内压力学性能蒙皮效应
ETFE cushionform-findingfinite element analysisinternal pressuremechanical behaviordiaphragmeffect
《建筑结构学报》 2012 (5)
自生成多面体空间结构的几何构成与应用技术的研究
38-45,8
深圳市科技计划项目(SY200806260039A),国家自然科学基金项目(50878065),哈尔滨工业大学科研创新基金(HIT.NSRIF.2009133).
https://opaj.napstic.cn/periodicalArticle/downloadReview/0120120807175121
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