- 學位論文
應用壓電感測器於混凝土結構早強評估及健康診斷
Application of Piezoelectric Transducer to Early-age Strength Monitoring and Health Monitoring of Concrete Structures
摘要
本論文之主要研究方向為運用智能骨材感測器進行混凝土早期強度評估、混凝土梁及構架試體之健康診斷試驗，研究所使用之智能骨材為以水泥砂漿包裹壓電陶瓷材料所製，利用基本波動力學及壓電材料可激發亦或接收應力波的特性，進行混凝土結構之健康診斷研究。於早期強度評估試驗上探討混凝土強度與壓電振幅訊號的關聯性；混凝土梁試驗與構架試驗皆進行結構健康診斷，前者探討梁試體損壞裂縫之寬度、長度與損壞指標關係；後者試驗針對三座不同材料組成的混凝土構架進行振動台試驗，探討於不同階段地震強度下之壓電振幅訊號與構架試體損壞位置及裂縫之關係，並將激發端之智能骨材分為預埋與後埋兩種方式，在每一次試驗後，量測試體內骨材互相傳遞之訊號，經數值分析得到損壞指標即可判讀各階段試驗損壞程度。本研究驗證了壓電材料應用於混凝土結構物檢測的可行性，結果顯示電壓振幅會隨著早期強度又或者試體的損壞程度越來越小，此為一種創新的檢測方法應用於土木結構領域。
並列摘要
In this paper,a water-proof piezoelectric patch with lead wires into a small concrete block,named the smart aggregates,are used for the concrete early-age strength monitoring and and health monitoring of reinforced concrete structures.Base on the wave propagration theory and piezoelectric transducer can be used as actuators to generate high frequency vibrating waves by concrete structures;meanwhile, they can also be used as receivers to detect the waves.During the concrete early-age strength monitoring, we study the relationship between the strength development of concrete structures and the development of harmonic response amplitude from the embedded piezoelectric sensor. Health monitoring are including RC columns subjected to reversed cyclic loading test and shake table test of RC frames. We study the relationship between the cracks of RC beam and the damage index in the former test.The other one, we study the relationship between the development of harmonic response amplitude from different PGA and the cracks of three different kinds of RC frames.By the way, the actuators divided into pre-embedded and post-embedded.By analyzing the wave response,the existence of crack can be detected and the severity can be estimated.The proposed smart aggreegate based approach successfully evaluated the status of concrete iii structures. With the increasing number and severity of cracks,the magnitude of the sensor output decrease .An innovative piezoceramic-based approach is developed in concrete civil structures.
參考文獻
延伸閱讀
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