Comparative Assessment of Static and Dynamic Damage Identification Indices Based on Distributed Macro-Strain Responses

摘要

In this paper, a new method for damage assessment of reinforced concrete(RC) beams is presented. This method is based on static data measured withdistributed long-gage macro-strain sensors. Based on static macro-strain, the staticdamage index independent of load is theoretically deducted considering thevariations of neutral axis height and flexural rigidity. RC beam experiment wasconducted to verify the effectiveness of the proposed method. The experimentalresults of a RC beam show that small crack initiation and propagation graduallyinduced by means of static load testing can also be identified. Meanwhile, damageindices using static and dynamic responses are compared and both of them areeffective for damage identification of the beam structure. Therefore, distributedlong-gage macro-strain sensing technique has great capacity for the damageassessment of the reinforced concrete structures.