›› 2009, Vol. 30 ›› Issue (S1): 244-249.

• Numerical Analysis • Previous Articles     Next Articles

Application of an improved three-points rain flow counting method to the evaluation of blasting damage

XIAO Jian-qing 1, 2, DING De-xin1, ZHANG Ping3, JIANG Fu-liang 1, 2   

  1. 1. School of Nuclear Resources and Safety Engineering, University of South China, Hengyang 421001, China; 2. School of Resources and Safety Engineering, Central South University, Changsha 410083, China; 3. School of Fine Arts, Hunan Normal University, Changsha 410081, China
  • Received:2008-08-05 Online:2009-08-10 Published:2011-03-16

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Abstract:

Structure failure subjected to seismic load induced by blasting is a complex process characterised by damage monotonic accumulation. So, attention should be paid to structure deterioration course besides the influence of geometric distance, blasting condition and geological condition on vibration intensity during blasting seismic effect research. It is suggested that fatigue theory should be used to analyze blasting seismic effect. Firstly, the method measuring stress spectrum induced by blasting is introduced. Secondly, an improved scheme is proposed to overcome the defects of rain flow counting model. The improved model simplified the process of counting by integrating equivalent points compression, peak-valley points detection into cycle counting. Then, the distribution of frequency is obtained by using the improved model to analyze the stress spectrum of vibration. The statistical result indicates that most fatigue cycles are low amplitude cycles, and the proportion of tensile and compressive cycles is very high.

Key words: blasting, fatigue, stress spectrum, rain-flow counting method

CLC Number: 

  • TD 235.1
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