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机构地区:[1]重庆大学土木工程学院,重庆400045 [2]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045
出 处:《中南大学学报(自然科学版)》2016年第6期2053-2057,共5页Journal of Central South University:Science and Technology
基 金:国家自然科学基金资助项目(51027004);教育部长江学者和创新团队发展计划项目(IRT1045)~~
摘 要:对结构动力系统响应信号间的虚拟脉冲响应函数进行小波包分解得到小波包频带能量谱,引入剩余频带的概念,创建特征频带向量谱,并在特征频带向量谱的基础上构建损伤特征向量谱。当损伤特征向量谱为零向量时,挡土墙不存在损伤;当损伤特征向量谱为非零向量时,挡土墙存在损伤。为了量化挡土墙的损伤状态,提出2个损伤预警指标:能量比均方差D_(IS)和能量比变异系数C_(Ⅳ)。对某桩板式挡土墙进行锤击振动试验,通过损伤预警指标对不同损伤状态下的挡土墙进行损伤识别。研究结果表明:当DIS=0,C_(Ⅳ)=0时,挡土墙不存在损伤;随着D_(IS)和C_(Ⅳ)的增大,挡土墙的损伤程度增大。因此,预警指标D_(IS)和C_(Ⅳ)不但可诊断挡土墙是否存在损伤,而且可识别挡土墙的损伤程度,可用于挡土墙结构的损伤预警。A wavelet packet frequency band energy spectrum was obtained using wavelet packet decomposition of virtual impulse response function between the response signals of structural dynamic system. The conception of residual frequency band was proposed, and character frequency band vector spectrum was also proposed. And the damage character vector spectrum was created based on the character frequency band vector spectrum. Retaining wall was undamaged when damage character vector spectrum was zero vector, while retaining wall was damaged when damage character vector spectrum was non-zero vector. In order to analyze the damage conditions of retaining wall quantitatively,two damage alarming indexes, i.e., energy ratio standard deviation(DIS) and energy ratio variation coefficient(C_(Ⅳ)), were proposed. Through a hammer vibration test on a pile plate retaining wall, the damage condition of retaining wall was identified by damage alarming indexes. The results show that the retaining wall is undamaged when D_(IS)=0, C_(Ⅳ)=0. With the increase of D_(IS) and C_(Ⅳ), the damage degree of the wall is also increased. So these alarming indexes based on damage character vector spectrum can not only distinguish whether the retaining wall is damaged or not, but also detect the damage degree of the wall. Consequently, the two indexes can be used to the damage alarming for retaining wall structures.
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