本論文之主要研究方向為運用壓電智能骨材進行混凝土結構之健康診斷,本研究使用之智能骨材以壓電陶瓷材料所製成,利用基本波動力學及智能材料可發射應力波,亦可接收應力波之特性,進行混凝土結構物健康診斷之研究,結構健康診斷為將智能骨材埋入RC結構物內,當試體受到破壞時,由智能材料發射應力波及由不同位置的智能骨材來擷取應力波,利用應力波振幅隨著結構破壞程度、裂縫增加而減少振幅之特性,可知結構物之損壞程度,再利用數值分析得到損壞指標,即可判斷出結構物損壞程度與裂縫多寡,壓電材料可進一步應用於實際結構檢測,判斷混凝土結構之健康程度,為土木結構非破壞檢測上之一種新的檢測方法。
Recent years, piezoelectric materials have been successfully applied to the damage detection of concrete structures due to their advantages of active sensing, low cost, quick response, availability in different shapes, and simplicity for implementation. The adopted smart aggregate of this research is fabricated by embedding a water-proof coated piezoceramic patch into a small concrete block. The major purposes of this research are the health monitoring of concrete structures under static load and seismic load. For RC structures damaged by reversed cyclic loading or earthquake loading, by analyzing the wave response, the existence of crack can be detected and the severity can be estimated. A damage index is developed to evaluate the damage status of the structures. The experimental results demonstrate the sensitiveness and the effectiveness of the proposed piezoceramic-based approach in the structural health monitoring of the concrete structure under static and earthquake loading. This is a new detection method for civil engineering structures on non-destructive testing.