Fire-damaged Identification of Both Brittle and Ductile Materials by Coupling a Nondestructive Acousto-optic Technique

• Main Authors: Tsu-Ching Tsao, 曹祖璟
• Other Authors: 陳立憲
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/s5c8dn

碩士 === 國立臺北科技大學 === 土木工程系土木與防災碩士班（碩士在職專班） === 103 === Associated with synchronized nondestructive techniques of acoustic emission (AE) and electronic speckle pattern interferometry (ESPI), macro- and micro-scale failure of reinforced concrete (including both brittle concrete and ductile steel materials) will be examined corresponding to entire true loading histories of both uniaxial compressive tests in concrete and tensile tests in steel bar before and after fire damage respectively. Objective in the plan will aim at the fire-driven damage/fracture characteristics such as micro-seismic activities, evolution from displacement continuity field to discontinuity (micro-crack initiation/propagation), and post-peak stability problem will be observed from coupled AE and ESPI by controlling the COD (crack opening displacement) as a feedback signal to conduct the closed-loop experiences. Furthermore, this study will propose a velocity ratio, defined as Vp/Vs, to be a useful index potentially to identify the degree of fire damage in field.