多孔裂缝围护结构HAM耦合迁移非连续模型及动态性能研究

随着既有、PC、地下建筑占比增加，围护结构受损日趋严重，所产生的裂缝会使内部热、空气、湿（HAM）迁移加剧而直接降低建筑综合性能。但目前研究集中在无损伤围护结构的热湿耦合迁移机理及其影响。因此为延长建筑寿命、提高结构安全性、降低建筑能耗和改善室内环境，进行多孔裂缝围护结构HAM耦合迁移机理及动态性能研究，是提高建筑综合性能的关键。本项目将采用理论、实验、和模拟方法及无人机结合图像技术，对裂缝尺度、裂缝特征参数、等效热湿物性参数、HAM耦合迁移机理、WDR动态边界条件、裂缝信息提取和主动控制技术等进行研究，建立HAM耦合迁移非连续模型和非荷载作用下围护结构裂缝发展预测模型，形成适合工程领域应用的建筑性能修正系数，搭建多因素下围护结构外表面受损基本信息平台，实现对建筑综合性能动态变化预测和评价。研究成果为建筑围护结构体系设计、维护、管理等阶段提供适宜的预防控制手段，为提高建筑性能提供科学指导。

With the increase of the proportion of existing，underground and PC buildings, the damage of the building envelope is becoming more and more serious. The cracks will aggravate the coupled transfer of heat, air and moisture (HAM) and directly reduce the comprehensive performance of the building. However, at present, the research focuses on the mechanism and influence of coupled heat and moisture transfer of undamaged envelope. Therefore, in order to prolong the life of the building, improve the safety of the structure, reduce the energy consumption of the building and improve the indoor environment, the research on the mechanism and dynamic performance of HAM coupling transfer of the porous crack envelope structure is the key to improve the comprehensive performance of the building. In this project, theoretical, experimental, and simulation methods and UAV image technology will be used to study crack scale, crack characteristic parameters, equivalent hygrothermal physical parameters, HAM coupled transfer mechanism, WDR dynamic boundary conditions, crack information extraction, active control technology, etc., to establish HAM coupled transfer discontinuous model and prediction model of crack development of retaining structure under non-load. In order to realize the prediction and evaluation of the dynamic change of the comprehensive performance of the building, we should form the correction coefficient of the building performance which is suitable for the application in the engineering field, construct the basic information platform of the damage of the outer surface of the enclosure structure under the multi-factors. The research results provide appropriate prevention and control means for the design, maintenance, management and other stages of building envelope system, and provide scientific guidance for improving building performance.