The boundary element analysis of hygrothermal stresses for Three-dimensional composite walls.

严重缺乏关于建筑物围护结构构件性能随时间变化的定量信息。建筑系统的耐久性和使用寿命设计尚未达到成熟阶段，因为许多关键问题尚未分析。在设计寿命耐久性方面的总体性能需要综合处理湿热运输、结构载荷以及化学和生物活动的各种性能。迄今为止，有限的工作是可用的，包括这个频谱的多学科activity.In本文中，一个新的耐久性模型是作为第一步的分析工具，以协助开发的设计属性/考虑湿热弹塑性的建筑墙体材料。本文提出了一种二维复合墙体湿热弹塑性力学变化及热湿传递的综合数值计算方法。日 ...更多信息 本文讨论了二维复合材料围护结构体系准静态湿热弹塑性非耦合模型的建立。本文提出了用边界积分方程求解二维弹性位移和应力的边界元法。利用对偶互易技术将与湿热体力有关的区域积分转化为等价的边界积分。结合其他创新技术，如对所有边界积分的解析计算，使得该方法功能强大，鲁棒性强，易于推广到完全非线性湿热弹塑性问题。利用二维问题的边界元方法，建立了热、湿、湿热弹塑性应力和位移同时变化的三维边界元数值方法，并验证了其数值精度.为了证明该模型的耐久性分析的能力，一个应用程序的情况下，建筑墙体组件。分析了一个英国砌合砌体墙系统，暴露于实际的天气，热，空气和水分传输的边界条件。少

Quantitative information on the performance of building envelope components as a function of time is severely lacking. Designing for the durability and service life of building systems has not reached a stage of maturity as many key issues have not yet been analyzed. The total performance in terms of designed life span durability requires the integration of various performances that deal with hygrothermal transport, structural loading and chemical and biological activities. Todate, limited work is available that encompasses this spectrum of multi-disciplinary activity.In this paper, a new durability model is presented as the first step towards the development of an analytical tool to assist in the design attributes/considerations of hygrothermoelasto-plasticity of building wall assemblies.1. An integrated numerical procedure is presented for hygrothermoelasto-plastic mechanical changes together with simultaneous heat and moisture transfer occurred in two dimensional composite walls. Th … More e development of an uncoupled quasistatic hygrothermoelasto-plasticity model for two dimensional composite building envelope systems is discussed. The boundary element method, using boundary integral equations for two dimensional elastic displacements and stresses is presented. Domain integrals related to hygrothermal body forces were converted into equivalent boundary integrals using the dual reciprocity technique. Together with other innovative techniques, such as, analytical evaluations of all the boundary integrals, makes this procedure powerful, robust and easy to extend to fully nonlinear hygrothermoelasto-plastic.2. A three dimensional boundary element numerical procedure on simultaneous changes of heat, moisture and hygrothermoelasto-plastic stresses and displacement is developed using similar approach taken for two dimensional problems and verified its numerical precision.3. To demonstrate the capability of this model for durability analysis, an application case is presented for a building wall assembly. An English bond masonry wall system, exposed to actual weather, heat, air and moisture transport boundary conditions is analyzed. Less