Dynamic responses of RC beams under long-duration near-planar blast waves

被引：0
|
作者：
Peng Q. [1 ]
Wu H. [1 ]
Fang Q. [2 ]
Lu H. [2 ]
机构：
[1] College of Civil Engineering, Tongji University, Shanghai
[2] Army Engineering University of PLA, Nanjing
来源：
Jianzhu Jiegou Xuebao/Journal of Building Structures | 2023年 / 44卷 / 03期
关键词：
blast test; dynamic response; equivalent single degree of freedom approach; long-duration near-planar blast wave; near-planar blast simulator; numerical simulation; RC beam;
D O I：
10.14006/j.jzjgxb.2021.0751
中图分类号：
学科分类号：
摘要：
The dynamic response and damage pattern of RC beams under long-duration near-planar blast waves were studied by conducting field tests and numerical simulations. To obtain the long-duration near-planar blast waves, a near-planar blast waves generation apparatus based on the plane multi-charge explosion technique was designed. The field tests on four simply-supported RC beams with the dimension of 2 500 mm × 200 mm × 200 mm were conducted, in which the magnitudes and durations of the near-planar blast loadings were varied within 0. 4-0. 7 MPa and 85-100 ms, respectively. Then, by adopting the structured-arbitrary-Lagrangian-Eulerian (SALE) solver and fluid-structure interaction algorithm implemented in the commercial finite element program LS-DYNA, the scenarios of the above test were simulated numerically. By comparing with the test data including the time histories of overpressure, rebar strain and displacement as well as post-blast structural damage, the accuracy of adopted finite element analyses approach was verified. The applicability of the equivalent single degree of freedom (SDOF) approach in the specification UFC 3-340-02 to predict the maximal mid-span deflection was further verified. The results indicate that the feasibility of long-duration near-planar explosion loading generating apparatus is proved; the RC beams exhibit the typical bending damage pattern in considered scenarios. The finite element analyses approach by using SALE in this paper applies to multi-points charges conditions. The SDOF method underestimates the maximum displacement of the RC beam at mid-span. For the considered blast scenarios, the dynamic amplification factors for concrete and rebar are recommended as 1. 05 and 1. 02, respectively. © 2023 Science Press. All rights reserved.
引用
收藏
页码：87 / 101
页数：14
相关论文
共 36 条
  • [1] LI J, HAO H., Numerical study of concrete spall damage to blast loads, International Journal of Impact Engineering, 68, pp. 41-55, (2014)
  • [2] KUMAR V, KARTIK K V, IQBAL M A., Experimental and numerical investigation of reinforced concrete slabs under blast loading, Engineering Structures, 206, (2020)
  • [3] SHI Y C, WANG J, CUI J., Experimental studies on fragments of reinforced concrete slabs under close-in explosions, International Journal of Impact Engineering, 144, (2020)
  • [4] CLUBLEY S K., Long duration blast loading of cylindrical shell structures with variable fill level, Thin-Walled Structures, 85, pp. 234-249, (2014)
  • [5] AULD H E, D'ARCY G P, LEIGH G G., Simulation of air-blast-induced ground motions:phase 2, (1965)
  • [6] JACQUES E., Blast retrofit of reinforced concrete walls and slabs, pp. 38-111, (2011)
  • [7] ALEX M R, STEVE P, DAVID R, Et al., Commissioning of the australian national facility for physical blast simulation, (2018)
  • [8] CHEN Yeqing, ZHOU Fengjun, SU Shaozeng, Simulation of long-duration and high-overpressure blast wave action using a plane charge, Explosion and Shock Waves, 14, 2, pp. 112-118, (1994)
  • [9] ZHANG Y D, FANG Q, LIU O, Et al., Numerical and experimental investigation into plane charge explosion technique, International Journal of Impact Engineering, 35, 10, pp. 1179-1185, (2008)
  • [10] CHEN H., LS-DYNA structured ALE (S-ALE) solver [C], 14th LS-DYNA International Users Conference, pp. 1-12, (2016)
1234