基于压电智能骨料的钢管混凝土柱冲击应力监测与数值模拟

Impact Stress Monitoring and Numerical Simulation Analysis of CFST Based on Piezoelectric Smart Aggregates

为研究钢管混凝土柱在冲击荷载作用下的应力监测方法,将压电智能骨料埋入钢管混凝土柱内部进行不同工况下的冲击应力监测试验。通过锤头加速度传感器和智能骨料的监测数据,分别转换并绘制了钢管混凝土柱的冲击力时程曲线和智能骨料的应力响应曲线,同时观测了试件的变形和破坏现象。利用ABAQUS软件对冲击试验进行有限元分析,将有限元分析结果与试验结果进行对比,二者吻合程度较好。结果表明,压电智能骨料能够有效监测钢管混凝土柱在冲击荷载作用下的内部应力变化,有限元建立的模型具有较好的适用性,本文研究成果可以为钢管混凝土结构动力灾变机理分析提供监测数据。

In order to research the stress monitoring method of the concrete filled steel tube column（ CFST） under the impact load,the piezoelectric smart aggregate is embedded into CFST to carry out the impact stress monitoring test under different working conditions. Through the monitoring data of the hammerhead acceleration sensor and the smart aggregate,the impact force time-history curve of CFST and the stress response curve of the smart aggregate are transformed and plotted respectively,and the deformation and failure of the specimen are observed. The finite element analysis of impact test is carried out by ABAQUS software. The results of finite element analysis are compared with the experimental results,and the two are in good agreement. The results show that the piezoelectric smart aggregate can effectively monitor the internal stress changes of CFST under the impact load,and the model established by the finite element method has good applicability. The results of this paper can provide the monitoring data for the analysis of the dynamic catastrophe mechanism of the concrete filled steel tube structure.