大型复杂结构健康精准体检方法  

Precise structural health diagnosis of large-scale complex structures

作　　者：朱宏平[1] 翁顺[1] 王丹生[1] 孙燕华[2] 夏勇[3] 高飞[1] ZHU Hongping;WENG Shun;WANG Dansheng;SUN Yanhua;XIA Yong;GAO Fei(School of Civil Engineering and Mechanics,Huazhong University of Science and Technology,Wuhan 430072,China;Mechanical Science and Engineering,Huazhong University of Science and Technology,Wuhan 430072,China;Department of Civil and Environmental Engineering,The Hong Kong Polytechnic University,Kowloon 999077,China)

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430072 [2]华中科技大学机械科学与工程学院,湖北武汉430072 [3]香港理工大学土木及环境工程学系,香港九龙999077

出　　处：《建筑结构学报》2019年第2期215-226,共12页Journal of Building Structures

基　　金：国家自然科学基金项目(51629801;51578260;51778258);国家重点研发计划(2016YFC0802002)

摘　　要：精确的安全检测与诊断评估是保证结构安全与长寿命服役的基础。为此,提出大型复杂结构的健康精准体检方法。建立了区域子结构与整体结构特征参数的定量关系式,推导区域子结构灵敏度计算方程,提出基于灵敏度分析的复杂结构损伤关键区域确定方法。提出了关键区域内部混凝土探伤的压电智能精准探测方法,通过压电阻抗的统计指标长距离、高精度表征混凝土内部损伤状况;建立关键区域内部钢结构磁电智能精准探伤方法,推导C形开环电流空间域磁场的聚集和调控方程,并在此基础上研发了开环式电磁磁化装置。基于子结构有限元模型修正的损伤识别方法,依据关键区域精准损伤精确诊断评估整体结构安全状态。研究结果表明:该健康体检方法精准探测结构内部微损伤,仅需关键区域损伤即可精确诊断评估结构安全性能,全寿命周期记录并动态评估大型结构各时期安全状况,为大型复杂结构安全诊断评估提供可靠的技术支撑。Accurate structural testing and diagnosis are the basis for structural safety and long life service. A ‘health diagnosis’ technique for large-scale complex structures is proposed in this paper. First, the quantitative relationship of characteristic parameters between the regional substructure and the global structure is established. The sensitivity formulas of the substructures to structural parameters are deduced. The method for determining the critical areas of damage in large-scale structures based on the sensitivity analysis is proposed. Afterwards, a piezoelectricity based damage detection method is developed to precisely and intelligently identify the damage in the interior of concrete. This method uses statistical indicators of piezoelectric impedance to assess the damage status in the interior area of concrete structure with a long-distance and high-precision. An open magnetizing technique is established for the damage detection of steel. The aggregation and regulation equations of the C-type open-loop magnetic field in space domain is deduced. Based on this method, a C-type open-loop electromagnetic magnetization device is developed. Finally, based on substructure-based model updating, the accurate damage detection of the local critical area is used to assess the structural conditions of the global structure. The research results show that, the ‘health diagnosis’ technique can detects the internal micro-damage of the structure, and accurately evaluate the structural safety performance by only requiring damage detection of critical area. The proposed technique records and dynamically evaluates the safety status of large-scale structures throughout the life cycle, providing high-accuracy safety assessment for large-scale complex structures.

关 键 词：大型复杂结构 健康精准体检 损伤探测 压电阻抗 损伤漏磁场 安全性能 

分 类 号：TU317.9[建筑科学—结构工程]