膜材料性能及其对结构的影响

首先对几种常见的膜结构破坏形式进行了阐述分析.在世博轴局部足尺模型试验中,将数值计算结果同试验结果进行了对比分析,发现两者相差很大,经分析认为主要是由于对膜材料性能的不了解及理论分析中所采用的本构关系太过近似所致.因此准确把握膜材料的力学性能对于膜结构的研究、应用和推广至关重要.本文对几种常见的建筑膜材料进行了一系列的试验研究,包括单轴性能试验、双轴性能试验、粘弹性性能试验、温度试验等,对建筑膜材料的抗拉强度、拉伸曲面进行了系统研究,考虑了温度对于膜材料力学性能的影响,并采用几种常见的粘弹性模型对膜材料的粘弹性性能进行了预测,最后提出了下一步的研究方向.

Material properties of membrane and its influence on structural behaviors

The main failure modes of membrane structures were analyzed.In the local full-size model experiments of membrane roof in Expo axis,significant differences were observed between the experimental data and the theoretical data.This is due to that the constitutive relations used in the theoretical analysis are not accurate with the misunderstanding of the material properties.Therefore,a better understanding of the material properties is important for the research,application and utilization of membrane structures.A systematic research on the mechanical property of common building membrane materials was conducted,including uniaxial tests,biaxial tests,viscoelasticity tests,and temperature tests.The tensile strength and constitutive surfaces were studied,in which the effects of temperature on the material mechanical properties were considered respectively.Several common models were used to predict the viscoelasticity of membrane materials.Finally,further work was proposed.