爆炸条件下结构超压-冲量曲线简化计算研究

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摘要超压-冲量（P-I）曲线可用于快速评估爆炸荷载作用下建筑结构的毁伤效应。基于单自由度等效体系运动方程和结构变形的理想弹塑性模型，在传统能量法基础上考虑阻尼影响，运用图像法计算阻尼耗能，得到了P-I曲线冲量区和准静态区的渐进线方程，在此基础上通过大量计算，得到了P-I曲线动态区的拟合公式。提出的简化计算公式与运用Newmark 法计算结构响应得到的P-I曲线相比较为一致，验证了所提方法的合理性。通过算例表明，随着延性比的增大，P-I图的冲量渐近线和准静态渐近线的值逐渐变小；随着阻尼比的增大，P-I图的冲量渐近线和准静态渐近线的值逐渐变大，且阻尼比对冲量渐近线影响明显。

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	陈俊杰1
	高康华1
	孙敖2

关键词 ：超压-冲量（P-I）曲线, 单自由度等效体系；理想弹塑性模型；阻尼；损伤评估

Abstract：Pressure-impulse (P-I) curves can be used to quickly assess damage effect of members under blast load. Based on motion equations of equivalent single-degree-of-freedom system and structural deformation of the elastic perfectly-plastic model, damping effect was considered in traditional energy method, and damping energy dissipation was calculated by using image method. The asymptote equations of quasi-static region and impulse region of P-I curves was obtained, and the fitting formulas for dynamic region of P-I curves were obtained through a large amount of calculation. The proposed simplified calculation formulas matched the P-I curves well, which were obtained by structural analysis of Newark method. The the rationality of the proposed method was verified. The calculation results show that the values of impulse asymptote and quasi-static asymptote decrease with the increase of ductility. The values of impulse asymptote and quasi-static asymptote increase with damping ratio, and damping ratio has obvious effect on impulse asymptote.

Key words： pressure-impulse curve single-degree-of-freedom system elastic perfectly-plastic model damping effect damage assessment

收稿日期: 2015-07-06 出版日期: 2016-06-25

引用本文:

陈俊杰1，高康华1,孙敖2. 爆炸条件下结构超压-冲量曲线简化计算研究[J]. 振动与冲击, 2016, 35(13): 224-232.
CHEN Jun-jie1, GAO Kang-hua1, Sun Ao2. Simplified calculation method for pressure-impulse curve under blast load. JOURNAL OF VIBRATION AND SHOCK, 2016, 35(13): 224-232.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2016/V35/I13/224

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