三角形ETFE双层气枕足尺试验研究

发布时间：2018-06-14 14:35

本文选题：ETFE气枕 + 足尺试验　；参考：《空间结构》2016年04期

【摘要】：对边长为3.74m的三角形ETFE双层气枕进行充气和膜面堆载试验,利用激光位移计对上下层8个测点的膜面高度进行实时测量,并与数值模拟结果对比分析.研究了三角形ETFE双层气枕的成形过程及风、雪荷载作用下的力学性能,验证了基于单轴拉伸试验所得材料力学参数的正确性和利用非线性有限单元法进行ETFE气枕分析的适用性.研究表明:(1)内压或外荷载作用下,三角形ETFE气枕膜面变形对称性较好,膜面高度随着内压、外荷载的增大呈线性增加或减小规律;(2)在风、雪荷载作用下,三角形ETFE气枕内接圆区域膜面应力较大且分布均匀,角部是低应力区,容易形成垂直于对角线的褶皱;(3)在风、雪荷载作用下,膜面应力小于ETFE第一屈服强度,气枕处于线弹性工作状态,三角形ETFE气枕具有较好的抵抗外部荷载作用的能力.
[Abstract]:The inflatable and membrane surface loading tests of a triangular ETFE double layer air pillow with a side length of 3.74 m were carried out. The height of the film surface of 8 measuring points in the upper and lower layers was measured in real time by using a laser displacement meter, and the results were compared with the results of numerical simulation. The forming process of the triangular ETFE double layer air cushion and the mechanical properties under wind and snow loads are studied. The correctness of the mechanical parameters obtained from the uniaxial tensile test and the applicability of the nonlinear finite element method for the analysis of the ETFE cushion are verified. The results show that under the action of internal pressure or external load, the deformation symmetry of the triangular ETFE pillow membrane surface is better, and the height of the membrane surface increases linearly or decreases with the increase of the internal pressure. (2) under the action of wind and snow, The stress of the membrane surface in the circular region of the triangle ETFE pillow is large and uniform, and the corner is a low stress zone, which is easy to form a fold, which is perpendicular to the diagonal line, under the action of wind and snow, the stress of the membrane surface is less than the first yield strength of ETFE. The air pillow is in a linear elastic state, and the triangular ETFE pillow has a better ability to resist the external load.
【作者单位】：同济大学建筑工程系;上海现代建筑设计集团;
【分类号】：TU38

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