基于移动窗口最小拟合法的空间网格结构损伤识别和状态评估方法研究

项目名称： 基于移动窗口最小拟合法的空间网格结构损伤识别和状态评估方法研究

项目编号： No.51468023

项目类型： 地区科学基金项目

立项/批准年度： 2015

项目学科： 建筑科学

项目作者： 桂国庆

作者单位： 井冈山大学

项目金额： 50万元

中文摘要： 近十年来，空间网格结构倒塌事故引起了工程界对其结构损伤识别以及状态评估科学性的广泛关注。空间网格结构状态评估方法的选择和测点布置，以及监测识别是研究难点，尤其是由于现场噪音以及其他因素的干扰，结构监测识别困难很大。本项目针对空间网格结构在环境荷载、疲劳效应、腐蚀等作用下的可靠度降低这一问题，结合结构在自重、地震、风、雪荷载等作用下的结构响应敏感性程度，建立考虑缺陷随机变量概率分布的可靠度分析方法和以敏感性为基础的测点布置方法；发展新的移动窗口最小拟合方法，以缺陷随机变量的概率分布函数为基础，对空间网格结构进行损伤识别和状态评估，并通过现场实测数据和理论计算数据的对比调整最小拟合法的移动窗口，实现交互式损伤识别；通过空间网格结构模型的冲击激励和振动台试验研究，对上述结构损伤识别和状态评估的新方法进行验证，同时开发相关的状态评估软件，为空间网格结构的健康评估提供更为高效准确的方法。

中文关键词： 空间网格结构；移动窗口最小拟合法；损伤识别；状态评估；随机缺陷

英文摘要： Substantial economic losses and fatalities during recent collapses of space latticed structures in the last ten years have highlighted the particular need to proper structural damage identification and their condition assessment. Determination and selection of appropriate methods and instrumentation layout for condition assessment of space latticed structures, as well as the corresponding damage identification, are still not clear. In particular, due to collected data on site usually contaminated by noise effect and other types of interventions, damage location detection using these data is the biggest challenge. To bridge this gap, this project will develop reliability-based analysis with random imperfections and the corresponding sensitivity for the benchmark of determination of instrumentation layout, which responds for the reliability of space latticed structures due to impacts of environmental effects, fatigue and fracture, and corrosion, and their sensitivity to various physical loadings, including self weight, earthquake, wind and snow loads. With the aid of a probability density function in terms of random imperfections, this project aims to develop a new moving-window least squares fitting method for damage detection and localization with applications to condition assessment of space latticed structures. The new fitting method will provide a capability of mutual adjustment for damage identification through its moving window, in accordance with data collected on site against predicted ones. In addition, the proposed fitting method will be experimentally validated with testing of scaled single-layer reticulated domes under a concentrated impact load and shake table, respectively. New in-house software consisting of those aforementioned functions will be developed in the end. This understanding will provide a robust structural condition assessment for space latticed structures.

英文关键词： space latticed structure;moving-window least squares fitting method;damage identification;condition assessment;random imperfection