雪荷载下充气膜结构的力学响应分析与破坏机制研究

发布时间：2019-02-26 21:33

【摘要】：近年来充气膜结构在国内发展迅速。充气膜结构是一种雪荷载敏感的柔性结构,雪荷载在其结构设计中往往起控制作用。国内外就曾经发生过因雪荷载导致充气膜结构坍塌的事故,因此本文着重分析雪荷载下充气膜结构的力学响应和破坏机制。首先,对比分析了我国规范、美国规范、加拿大规范和欧盟规范对充气膜结构的雪荷载分布规定;研究单坡屋面、单跨双坡屋面以及拱形屋面的雪荷载分布情况,并结合这些规范给出充气膜结构的雪荷载分布简化模型。其次,对充气膜结构进行二维模型雪荷载受力理论分析,得出影响充气膜结构力学性能的因素。之后利用ANSYS有限元软件对二维模型和三维模型进行对比分析,讨论了结构的内压、雪压、长宽比以及矢跨比参数变化对充气膜的雪荷载下内力、变形的影响。着重分析了其对结构的竖向最大位移和最大应力值的影响。接着,对部分柔性太阳能板覆盖的充气膜结构进行了研究,讨论了太阳能板布置方式对充气膜结构的影响,并对部分太阳能板覆盖的充气膜结构的雪荷载响应进行了研究。最后,主要对充气膜结构的强度破坏进行了研究。推导了充气膜结构在雪荷载作用下,凹陷处的极限承载力的计算公式,探讨了结构极限承载力与充气膜结构的膜厚、矢跨比、长宽比和内压的关系,并运用LS-DYNA软件分析了其对膜单元极限荷载的影响。
[Abstract]:In recent years, inflatable membrane structure has developed rapidly in China. Inflatable membrane structure is a kind of flexible structure which is sensitive to snow load. Snow load often plays a controlling role in the design of its structure. There has been an accident of collapse of inflatable membrane structure caused by snow load at home and abroad. Therefore, the mechanical response and failure mechanism of inflatable membrane structure under snow load are analyzed emphatically in this paper. Firstly, the snow load distribution rules of inflatable membrane structures in China, USA, Canada and EU are compared and analyzed. The snow load distribution of single-slope roof, single-span double-slope roof and arch roof is studied, and a simplified model of the snow load distribution of inflatable membrane structure is given based on these codes. Secondly, the theoretical analysis of the two-dimensional model snow load on the inflatable membrane structure is carried out, and the factors affecting the mechanical properties of the inflatable membrane structure are obtained. Then the two-dimensional model and three-dimensional model are compared with each other by using ANSYS finite element software. The effects of internal pressure, snow pressure, length-to-width ratio and rise-span ratio parameter on the internal force and deformation of inflatable film under snow load are discussed. The influence of it on the vertical maximum displacement and maximum stress of the structure is emphatically analyzed. Then, the inflatable membrane structure covered by some flexible solar panels is studied, the influence of solar panel arrangement on the inflatable membrane structure is discussed, and the snow load response of the inflatable membrane structure covered by partial solar panels is studied. Finally, the strength failure of inflatable membrane structure is studied. The formula for calculating the ultimate bearing capacity of inflatable membrane structure under snow load is derived, and the relationship between the ultimate bearing capacity of the structure and the film thickness, rise-span ratio, length-width ratio and internal pressure of the inflatable membrane structure is discussed. The influence on the ultimate load of membrane element is analyzed by LS-DYNA software.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU383

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