NUMERICAL ANALYSIS OF ANTI-EXPLOSION PERFORMANCES OF RC BEAM WITH INITIAL CRACKS STRENGTHENED WITH CFRP SHEETS

Abstract

Abstract: Building structures strengthened with CFRP is a kind of new technology. Only limited research has been developed to study anti-explosion performances of simply supported RC beams with initial cracks (pre-cracked RC beam). Based on the large nonlinear dynamics analysis software LS-DYNA, nonlinear finite element analysis of the anti-explosion behavior of pre-cracked RC beams locally strengthened with CFRP in the form of full package were conducted from two aspects of strengthening layers and lengths of CFRP. The results show that, when the pre-cracked RC beam locally was strengthened by CFRP, the overall stiffness of the pre-cracked RC beam is improved, and that the damage and deformation under blasting load is reduced. When four layers of 300 mm wide CFRP sheets in the form of full package were locally bonded to the surface of pre-cracked RC beam, where the initial cracks located, the anti-explosion properties of the pre-cracked RC beam could be effectively improved to some extent. The obtained results are of great significance to the anti-explosion design and reinforcements of RC structures.

Key words: RC beam, initial cracks, anti-explosion behavior, blasting load, CFRP

CLC Number:

TB332

QU Yan-dong, LI Xin, LIU Wan-li, ZHANG Wen-jiao. NUMERICAL ANALYSIS OF ANTI-EXPLOSION PERFORMANCES OF RC BEAM WITH INITIAL CRACKS STRENGTHENED WITH CFRP SHEETS[J]. Fiber Reinforced Plastics/Composites, 2016, 0(8): 53-56.

References

[1] 鲍育明, 赵艳秋. 碳纤维布加固钢筋混凝土构件抗爆性能研究综述[J]. 建筑技术, 2006, 37(6): 428-430.
[2] 刘华新, 柳根金, 孔祥清, 等. 纤维增强复合材料抗剪加固混凝土梁试验研究进展[J]. 科技导报, 2016, 34(2): 94-98.
[3] 黄羽立, 叶列平. 碳纤维布加固RC梁中粘结性能的非线性有限元分析[J]. 工程力学, 2004, 21(2): 54-61.
[4] Tabatabaei Z S, Volz J S, Baird J, et al. Experimental and numerical analyses of long carbon fiber reinforced concrete panels exposed to blast loading [J]. International Journal of Impact Engineering, 2013, 57(1): 70-80.
[5] 周春苹, 李兴德, 朱杉. 玻璃纤维复合材料砂石冲击数值模拟与试验研究[J]. 玻璃钢/复合材料, 2014(8): 54-58.
[6] 曲艳东, 李鑫, 孔祥清, 等. 爆炸荷载作用下钢筋混凝土梁的抗爆与加固技术研究进展[J].科技导报, 2016, 34(2): 99-103.
[7] 张志刚, 李姝雅, 瘳红建. 爆炸荷载下碳纤维布加固混凝土板的抗弯性能研究[J]. 应用力学学报, 2008, 25(1):150-153.
[8] Yan B, Liu F, Song D Y, et al. Numerical study on damage mechanism of RC beams under close-in blast loading[J]. Engineering Failure Analysis, 2015, 51: 9-19.
[9] 曲艳东, 吴敏, 孔祥清, 等. 深孔连续与间隔装药爆破数值模拟研究[J]. 爆破, 2014(4):16-21.
[10] Uenishi K, Takahashi H, Yamachi H, et al. PC-based simulations of blasting demolition of RC structures [J]. Construction and Building Materials, 2010, 24(12): 2401-2410.
[11] Zhang F R, Wu C Q, Wang H W, et al. Numerical simulation of concrete filled steel tube columns against blast loads [J]. Thin-Walled Structures, 2015, 92, 82-92.
[12] 赵凯, 王肖钧, 卞梁,等. 混凝土介质中不同药形装药爆炸波传播特性的数值模拟[J]. 中国科学技术大学学报, 2007, 37(7):711-716.
[13] Zhang D, Yao S J, Lu F Y, et al. Experimental study on scaling of RC beams under close-in blast loading [J]. Engineering Failure Analysis, 2013, 33: 497-504.
[14] Livermore Software Technology Corporation. LS-DYNA keyword user′s manual[M]. California: Livermore Software Technology Corporation, 2006.
[15] Hallquist J O. LS-DYNA keyword user′s manual. Volume I and Ⅱ, Version 971 R6.0.0[Z]. California: Livermore Software Technology Corporation, 2012: 246-249.
[16] Mou H L, Zhou T F, Chen Y F. Simulation and experimental analysis of composite corrugated plate quasi-static crushing [J]. Mechanical Science and Technology for Aerospace Engineering, 2015, 34(4): 618-622.