环境激励下挡土墙结构损伤识别及安全性评价  

Damage recognition and safety evaluation of retaining wall structure under environmental excitation

作　　者：徐乾 XU Qian(College of Civil Engineering and Architecture,Shaanxi University of Technology,Hanzhong 723001,China)

机构地区：[1]陕西理工大学土木工程与建筑学院,陕西汉中723001

出　　处：《振动与冲击》2023年第13期155-162,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金青年项目(51908345);陕西省教育厅专项科研计划项目(20JK0559)。

摘　　要：在役挡土墙结构在多因素作用下会出现损伤,而损伤即降低其安全性。为评价在役挡土墙结构的安全性,对环境激励下挡土墙结构动力响应间虚拟脉冲响应函数进行希尔伯特边际能量比谱分析,基于希尔伯特频段的损伤敏感性分析,创建识别挡土墙结构损伤的希尔伯特损伤特征向量和损伤指标;并以某在役桩板式挡土墙结构为试验对象,将行驶车辆引起的振动作为激励,并考虑环境温度和湿度的影响,对该挡土墙进行环境激励下的多次现场测试,通过损伤指标识别该挡土墙的损伤并评价其安全性。试验结果发现:在环境激励持续作用下,损伤指标值持续增长,挡土墙稳定系数逐渐减小,表明挡土墙的损伤在持续产生、损伤程度不断增大、安全性逐渐降低;而建立稳定系数与损伤指标间的定量关系可评价挡土墙的安全性;另外,温湿度对挡土墙损伤积累有较大影响,尤其是高温联合强降雨会加速挡土墙损伤的出现;因此,通过损伤指标不仅可识别挡土墙的损伤还可评价其安全性。Retaining wall structure in service can be damaged under action of multi-factor,and damage may reduce its safety.Here,to evaluate safety of retaining wall structure in service,Hilbert marginal energy ratio spectral analysis of virtual impulse response function for dynamic responses of retaining wall structure under environmental excitation was performed.Based on damage sensitivity analysis of Hilbert frequency bands,Hilbert damage feature vector and damage index for recognizing retaining wall structure damage were created.A pile-plate retaining wall structure in service was taken as the test object,vibrations caused by driving vehicles were taken as environment excitation.Considering effects of environment temperature and humidity,the retaining wall was tested several times under environmental excitation,its damage was recognized with damage index and its safety was evaluated.The test results showed that under continuous action of environmental excitation,the retaining wall structure’s damage index value increases continuously and its stability coefficient gradually decreases to reveal its damage continuously occurring,its damage degree continuously increasing and its safety gradually decreasing;the quantitative relation between stability coefficient and damage index can be established to evaluate safety of retaining wall;temperature and humidity more largely affects accumulation of retaining wall damage,especially,combination of high temperature and strong rainfall can accelerate occurrence of retaining wall damage;damage index can not only recognize retaining wall damage,but also evaluate its safety.

关 键 词：损伤识别 安全性评价 现场测试 挡土墙结构 环境激励 希尔伯特损伤特征向量 

分 类 号：TU311.41[建筑科学—结构工程]