密肋复合墙结构体系火灾灾变机理及安全评估研究

Multi-ribbed composite wall structure is new structural system, which was developed in response to increasing need of innovative and energy-efficient building wall systems from the country. The advantages of this system include light weight, high strength, energy efficiency and excellent seismic performance. After nearly two decades’ promotion, it has been widely used in numerous engineering applications in many areas of the country. Extensive studies have been conducted on its mechanical properties and seismic performance. However, all these studies only consider room temperature. Until now, there is no study available on its performance subjected to fire and post-disaster safety assessment. The aim of this project is to fill this blank. First, fire performance of the wall system will be evaluated at multiple levels, from material, component to structural levels, based on damage theory. Next, a post-disaster safety assessment method will be proposed to study the performances of the damaged structure, calculate remaining capacities and stiffness, and quantitatively determine the degree of damage of the structure subjected to fire. Finally, design guidelines will be provided considering fire effect. This project is expected to significantly improve the design theory and expand the use of the multi-ribbed composite wall structure.

密肋复合墙结构是为适应国家墙体材料革新与建筑节能、可持续发展而开发的一种生态、节能、减震型建筑结构新体系。经过近二十年的推广，该体系已在国内部分地区得到大量的工程应用。然而，对该体系的研究，目前还仅局限于常温下的力学特性和抗震性能，对其遭受火灾时的灾变机理及灾后安全评估的研究，则尚属空白。本项目的研究内容，主要包括两部分：一是密肋复合墙结构的火灾灾变机理研究，二是火灾后结构的安全评估方法研究。在火灾灾变机理研究方面，将基于损伤力学理论，从材料层次、构件层次，最后到结构层次进行系统的理论建模、数值分析和实验研究，以揭示该体系的火灾灾变机理；在火灾后结构的安全评估研究方面，拟通过对各种受损结构材料性能进行研究，对火灾后结构和构件进行剩余承载力和刚度的计算，对部分构件乃至整体结构的受损程度进行定量判断，最终提出一种密肋复合墙体火灾后的安全评估方法，进而完善密肋复合墙结构设计理论。

密肋复合墙结构是为适应国家墙体材料革新与建筑节能、可持续发展而开发的一种生态、节能、减震型建筑结构新体系。经过近二十年的推广，该体系已在国内部分地区得到大量的工程应用。然而，对于该体系的研究，目前还仅局限于常温下的力学特性和抗震性能，对其遭受火灾时的灾变机理及灾后安全评估的研究，则尚属空白。. 本项目将试验、理论和数值模拟相结合对密肋复合墙结构的火灾灾变机理和其火灾后结构的安全评估方法进行了系统的研究。基于损伤力学理论，从材料层次、构件层次，最后到结构层次进行了理论建模、数值分析和实验研究，揭示了该体系的火灾灾变机理；利用结构易损性理论对火灾后该结构的安全进行评估研究，提出了一种密肋复合墙体火灾后的安全评估方法，进而完善了密肋复合墙结构设计理论。 . 以本项目为依托，共培养毕业硕士研究生8名，在读研究生5名；发表期刊论文7篇，其中SCI收录期刊论文3篇，EI论文4篇。本项目的实施，对于完善该结构体系的设计理论，具有重要的理论意义和工程应用价值。