在役挡土墙结构在多因素作用下会出现损伤，而损伤可能降低其安全性。为了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以及评价其安全性。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，挡土墙损伤程度在不断增大，挡土墙的安全性在逐渐降低。而且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以评价其安全性。
Abstract
The damages will appear within retaining wall structures in service under many factors, the damage may decrease the safety of retaining wall structures. To evaluate the safety of retaining wall structures in service, the Hilbert marginal energy ratio spectrum analysis was performed via the Hilbert-Huang Transformation of a virtual impulse response function of responses to the retaining wall structure under ambient excitation. Based on the damage sensitivity analysis of bands obtained via the Hilbert-Huang Transform, the Hilbert damage feature vector and damage index, which were used to reflected damage information of the retaining wall, were created. Tests on a pile plate retaining wall structure in service were performed. The vibration caused by vehicles was regarded as excitations. Multiple field tests on the retaining wall were performed under ambient excitations with considering the influences of environmental temperature and humidity. The damage index was used to identify the damage within the retaining wall and evaluate the safety of the wall. The tests results indicate that the value of the damage index increases continuously and the safety of the wall decreases under the persistent effects of ambient excitations. It is shown that damages appear within the wall continuously, the damage intensity of the wall increases continuously, and the stability of the wall decreases gradually. The safety of the can be evaluated via establishing quantitative relationship between the stability coefficient and damage index. In addition, the temperature and humidity have larger influences on damage accumulation. Especially, high temperature and heavy rainfall will accelerate appearance of the damage within the retaining wall. Thus, the damage index can be used to identify damages within the wall and evaluate the safety of the wall.
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
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Key words
damage identification /
safety evaluation /
field tests /
retaining wall structures /
ambient excitation /
Hilbert damage feature vector
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