EFFECTS OF NEGATIVE PHASE BLAST LOADING ON STRUCTURAL RESPONSES
A blast load consists of a positive and a negative phase. The positive phase refers to the blast loading duration in which the pressure is greater than the atmospheric pressure,while the negative phase refers to the duration in which the pressure is below the atmospheric pressure. In design and analysis of blast loading effects on structures,the negative phase blast loading is often neglected owing to its relatively small amplitude as compared to that of the positive phase. Recent experiments have shown however that the effect of negative phase could be significant on structural responses,especially when the positive phase duration is short. There is no systematic study yet on the effects of neglecting the negative phase blast loadings on structural responses. This study calculates the errors arising from neglecting the negative phase of blast loadings on responses of reinforced concrete beams,and the corresponding Pressure-Impulse curves. Both linear elastic and nonlinear inelastic responses are calculated. It is found that when the structural responses are in the quasi-static and dynamic range,the negative phase of the blast loading can be neglected in the analysis. However,when the structure response falls in the impulsive range,neglecting negative blast loading phase will introduce errors in structural response calculations,especially when the explosion scaled distance is large.
Blast load Negative phase Pressure-impulse curve Inelastic response
Hong Hao
School of Civil and Resource Engineering,the University of Western Australia,Crawley,WA 6009,Australia
国际会议
The Eleventh International Symposium on Structural Engineering(第十一届结构工程国际研讨会)
广州
英文
2048-2054
2010-12-01（万方平台首次上网日期，不代表论文的发表时间）