Acoustic emission generated in corners of reinforced concrete rigid frame under cyclic loading

摘要: A fundamental study was made of the acoustic emission (AE) behavior reinforced concrete structures under cyclic loading. The growth tensile cracks, shear cracks and bond failure reinforcement in an L shaped rigid frame monitored by AE. results were compared with visual observation measured value crack widths deflections. From tests, it shown that different AE sources could be clearly discriminated comparing parameter data width measurement. It revealed Kaiser effect exists so long as is smaller than about 0.15--0.20 mm (0.006--0.0078 in.). However, fails after has reached this onset cracks. effect, thus, becomes a very effective method for estimating level deterioration structures. Moment tensor analysis, quantitative waveform analysis based on moment modeling applied to classify types determine orientations fracture process frame. Crack determined from eigenvectors obtained decomposition components more » directions presented crack-opening vectors fault-motion good agreement surface showed start appear play primary role when fails. « less