涂层织物类建筑膜材料的动力本构关系及损伤破坏机理研究

项目名称： 涂层织物类建筑膜材料的动力本构关系及损伤破坏机理研究

项目编号： No.51308532

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 建筑科学

项目作者： 张营营

作者单位： 中国矿业大学

项目金额： 25万元

中文摘要： 涂层织物类建筑膜材料是一种柔性的复合材料，具有明显的非线性、非弹性和粘弹性,其力学性能受加载历史影响明显。膜材料力学性能是研究膜结构复杂非线性行为的重要基础，而实践证明现有的膜材料本构关系模型和强度准则模型是十分粗陋的，应用于实际工程时会造成较大的安全隐患。为此，本项目拟采用试验和理论分析相结合的方法，从宏观和微观角度认识与分析实际工程中影响膜材料损伤破坏的主要因素及其发展规律，阐明膜材料的动力损伤机制及其宏观力学行为，明确膜材料的动力破坏模式及其强度准则，研究复杂受力条件下的膜材料非线性行为及其理论描述，探索膜材料在应力与环境耦合作用下的老化机理，科学揭示非线性、随机性、率相关特征之间的内在规律，建立能反映工程实际情况的膜材料时变本构关系模型。项目的研究成果可以为准确把握膜结构在强风、雪等灾害作用下的动力非线性行为提供理论参考，而且对于进行膜结构的可靠度分析和寿命预测具有一定指导意义。

中文关键词： 涂层织物类建筑膜材料；动力力学性能；破坏模式；损伤机理；耐久性能

英文摘要： As a typically nonlinear, inelastic and viscoelastic material, building coated fabric is a flexible composite, of which the mechanical properties are affected by loading history significantly. The mechanical properties of membrane materials are the important basis of studying the complex nonlinear behaviors of membrane structures. However, the practice has proven that the existing constitutive relations and the strength criteria are inaccurate, which may lead to the insecurity of actual engineering. Based on the method of experiment and theoretical analysis, from the macroscopic and microcosmic view, this research first analyzes the key factors that affects the principle of damage development, illustrates the dynamic damage mechanism and macroscopic mechanical behaviors, and explicits the dynamic failure modes and the failure criteria of building coated fabrics. Then, this research studies the nonlinear behaviors under complex loading conditions, explores the aging mechanism of membrane materials under the stress-environment interaction, and discloses the relationship between nonlinearity, randomness and rate-dependence. Finally, the time-dependent constitutive relation that can reflect the acutal state is built. The research results can provide a scientific base to grasp the dynamic nonlinear behaviors under st

英文关键词： building coated fabrics；dynamic mechanical properties；failure mode；damage mechanisim；durability