Numerical Analyses of Hygrothermal Durability Performances on Multi-dimensional Composite Building Envelopes with Metalic Elements

为了提供高性能的建筑围护结构，以应对气候变化问题，复合钢墙体的耐久性评估是未来需要解决的重要工程难题之一，需要金属元素围护结构长期湿热性能的数值模拟与腐蚀性能预测相结合的技术。在这项研究中，我们开发了一个数值程序来预测含金属元素的多维复合建筑围护结构的湿热和腐蚀性能。利用边界元技术，建立了多维的热、空气和水分传递模型。提出了边界积分和域积分的数值计算方法，提高了计算效率和精度。本文描述了一种简单且鲁棒的方法来描述任意连接的异质体的边界和界面，它可以减少求解方程组的旋转系数的计算资源。对一些简单的热问题进行了数值分析。在第六章中，为了证明该方法在热湿性能和腐蚀性能方面的有效性和适用性，分析了带通风空腔的实际结垢外保温墙体的现场监测实验数据。带有通风腔的监测墙设计了由SUS支柱支撑的铝外包层。并对热工性能、防潮性能和防腐性能的差异进行了评价。这些监测数据的合并可以为整个数值过程的比较和验证提供重要的机会。此外，还为以下方面的实验评估提供了机会：(1)通风腔壁的湿热性能；(2)空腔的气流和除湿特性；(3)支撑饰面层的不锈钢或铝制柱的热经济性改善。本文介绍了实验装置和测量方案，并给出了墙体系统近期热湿状况的测量数据。少

In order to provide high performance building envelopes as a counter measure against the climate change issues, a durability assessment of composite steel walls are the one of the important engineering challenges to be solved in ner future, It should be required a jointed technology of numerical simulation procedures for the long term hygrothermal performances on building envelopes with metallic elements and corrosion performance predictions on them.In this investigation, we have developed a numerical procedure to predict both hygrothermal and corrosion performances for multi-dimensional composite building envelopes with metallic elements. Multi dimensional heat, air and moisture transfer has been formulated by the boundary element techniques. Numerical evaluation procedures were proposed for boundary integrals and domain integrals with both numerical efficiency and accuracy. A simple and robust procedure to describe boundaries and interfaces for arbitrarily connected heterogeneous bod … More ies has been described which can reduce computational resources for pivoting coefficients for solving the system of equations. Couples of simple thermal problems have been analysed as numerical demonstrations.In the sixth chapter, in situ monitored experimental data on the real scaled exterior insulation wall with vented cavity has been analysed in order to demonstrate usefulness and applicability of the proposed method for hygrothermal and corrosion performances. The monitored wall with vented cavity devised aluminum exterior cladding supported by SUS pillars. The differences on thermal performances and moisture and corrosion performances as well, have been evaluated. The merging these monitored data can create important opportunity to compare and validate the whole numerical procedure. Besides it also provide opportunity for experimental evaluations on following aspects : (1) Hygrothermal performances of a vented cavity wall, (2) the air flow and dehumidification characteristics of the cavity, and (3) improving thermal and economical performance of pillars fabricated by stainless-steel or aluminum which support the finish layer. In this paper, the experimental setup and the measurement plan are described and measured data on recent hygrothermal situations of wall systems are presented. Less