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The spectrum characteristics of microseismic signals in different deformation and failure stages of the concrete beam are analyzed, and the identification method of the fracture stages and crack propagation precursors of concrete beam is established. Meanwhile, the Realistic Failure Process Analysis code (RFPA) is adopted to simulate and analyze the entire failure processes of concrete beam from its cracks initiation, development, propagation, and coalescence, until macroscopic fractures formation subjected to three-point bending test. The relation curve of the load, loaded displacement, and acoustic emission (AE) of concrete beam in the three-point bending test is also obtained. It is found that the failure characteristics of concrete beam obtained from numerical experiments agree well with the field physical test results. The heterogeneity of concrete is the major cause of zigzag propagation paths of beam cracks subjected to three-point bending tests. The results lay foundation for further exploring the formation mechanism of dam concrete cracks of Guanyinyan hydropower station.<\/jats:p>","DOI":"10.1155\/2015\/987232","type":"journal-article","created":{"date-parts":[[2015,7,27]],"date-time":"2015-07-27T21:03:40Z","timestamp":1438031020000},"page":"1-11","source":"Crossref","is-referenced-by-count":5,"title":["Microseismic Signal Characterization and Numerical Simulation of Concrete Beam Subjected to Three-Point Bending Fracture"],"prefix":"10.1155","volume":"2015","author":[{"given":"Nuwen","family":"Xu","sequence":"first","affiliation":[{"name":"State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu, Sichuan 610065, China"},{"name":"College of Civil Engineering, Shandong University, Ji\u2019nan, Shandong 250016, 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