As an effective structure health monitoring technology, acoustic emission (AE) has been developed rapidly in various fields over recent years. AE source localization is the core element of AE technology. In this paper, a Node Block Location Method (NBLM) based on the collaborative model of node and block matrix was proposed to meet the high-precision requirement of source localization in the quasi-cylindrical structure with complex hole. NBLM can not only bypass the empty area, but also fit the actual propagation of elastic waves better in the complex boundaries. In order to evaluate the effectiveness of NBLM, lead-breaking tests were carried out on two cylindrical structure: one with square hole and the other with circular hole. The lead-breaking points were used as AE source in the test. The source coordinates were inverted by three separate location methods according to arrivals. Test results verify the superiority of NBLM and show that the location accuracy of the NBLM has been greatly improved compared to the existing methods. INDEX TERMS Acoustic emission (AE), lead-breaking test, node block location method (NBLM), source localization.
Based on the general finite element software ABAQUS, the FE model of 30-story SRC frame-RC core wall hybrid structure is established and the simulation analysis is conducted to the evolution of storey damage under cyclic loading, then the law of storey damage evolution affected by component damage is revealed. The analysis results show that the storey damage evolution is affected more by the damage of SRC column and RC shear wall than by the SRC beam's, when the single component has similar damage; and also is affected greatly by the damage of RC shear wall, when the two different types of components have similar damage. Based on the results of numerical simulation, the mathematical relations between the component damage and the storey damage are established, which would provide theoretical support to the hybrid structure damage model under earthquake excitation.
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