爆炸条件下结构超压-冲量曲线简化计算研究

陈俊杰1,高康华1,孙 敖2

振动与冲击 ›› 2016, Vol. 35 ›› Issue (13) : 224-232.

PDF(1869 KB)
PDF(1869 KB)
振动与冲击 ›› 2016, Vol. 35 ›› Issue (13) : 224-232.
论文

爆炸条件下结构超压-冲量曲线简化计算研究

  • 陈俊杰1,高康华1,孙  敖2
作者信息 +

Simplified calculation method for pressure-impulse curve under blast load

  • CHEN Jun-jie1, GAO Kang-hua1, Sun Ao2
Author information +
文章历史 +

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。

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.

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

Key words

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

引用本文

导出引用
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[J]. Journal of Vibration and Shock, 2016, 35(13): 224-232

参考文献

[1] Wesevich J W, Oswald C J. Empirical based concrete masonry pressure-impulse diagrams for varying degrees of damage [C]. American Society of Civil Engineers, 2005, 2083-2094.
[2] Baker W E, Cox P A, Westine P S, et al. Explosion Hazards and Evaluation [M]. Amsterdam, New York: Elsevier Scientific Pub. Co., 1983.
[3] Oswald C J, Skerhut D. FACEDAP User’s Manual [M]. Omaha: Southwest Research Institute and U.S. Army Corps of Engineers, 1993.
[4] Krauthammer T. Modern protective structures [M]. Boca Raton, London, New York: CRC Press, 2008.
[5] Krauthammer T, Astarlioglu S, Blasko J, et al. Pressure-impulse diagrams for the behavior  assessment of structural components[J]. International Journal of Impact Engineering, 2008, 35(8): 771-783.
[6] Li Q M, Meng H. Pulse loading shape effects on pressure-impulse diagram of an elastic-plastic, single-degree-of-freedom structural model [J]. International Journal of Mechanical Sciences, 2002, 44(9): 85-98.
[7] Li Q M, Meng H. Pressure-impulse diagram for blast loads based on dimensional analysis and single-degree-of-freedom model [J]. Journal of Engineering Mechanics (ASCE), 2002, 128(1): 87-92.
[8] Soleiman F A, Louca L A. Pressure-impulse diagrams for elastic plastic hardening and softening single-degree-of-freedom models subjected to blast loading [J]. International Journal of Impact Engineering, 2007, 34(4): 823-842.
[9] Ma G W, Shi H J, Shu D W. P-I diagram method for combined failure modes of rigid-plastic beams [J]. International Journal of Impact Engineering, 2007, 34(6): 1081-1094.
[10] Wang W, Zhang D, Lu F Y, et al. Pressure-impulse diagram with multiple failure modes of one-way reinforced concrete slab under blast loading using SDOF method [J]. Journal of Central South University of Technology, 2013, 20(2):510-519.
[11] 李忠献,师燕超,史祥生. 爆炸载荷作用下钢筋混凝土板破坏评定方法[J]. 建筑结构学报, 2009, 30(6):61-66.
Li Zhongxian, Shi Yanchao, Shi XiangSheng. Damage analysis and assessment of RC slabs under blast load [J]. Journal of Building Structures, 2009, 30(6):61-66.
[12] Huang X, Li J C, Ma G W. Damage analysis of RC column/beam subject to blast load [C] Proceedings of the 8th International Conference on Shock and Impact Loads on Structures. Adelaide:2009, 311-320
[13] Shi Y C, Hao H, Li Z X. Numerical derivation of pressure-impulse diagrams for prediction of RC column damage to blast loads [J]. International Journal of Impact Engineering, 2008, 35(11): 1213-1227.
[14] Wu C, Sheikh H. Simulation of pressure impulse diagrams for foam protected RC members [C]. Proceedings of the 22nd Australasian Conference on the Mechanics of Structures and Materials, ACMSM 2012:787-792.
[15] Mutalib A A, Hao H. Development of P-I diagrams for FRP strengthened RC columns [J]. International Journal of Impact Engineering, 2011, 38(5): 290-304.
[16] Huang X. Ma G W. Li J C. Damage assessment of reinforced concrete structural elements subjected to blast load [J]. International Journal of Protective Structures, 2010, 1(1): 103-124.
 

PDF(1869 KB)

Accesses

Citation

Detail

段落导航
相关文章

/