地震后地下受损拱结构的抗爆炸能力研究
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摘要
为了评估地下结构的地震后抗爆炸能力,以边墙高3.0 m、半径3.0 m的半圆拱结构为模拟对象,假定了7种裂缝可能出现的位置。采用网格划分软件True Grid构建网格模型,基于LS-DYNA数值模拟分析地下拱结构在1条裂缝、2条裂缝和3条裂缝条件下的抗爆炸能力。分析结果表明:1条裂缝存在的条件下,地下拱结构的抗爆炸能力平均下降50%以上,裂缝的位置对地下拱结构的抗爆炸能力有明显影响,底板与边墙连接处的裂缝影响最大,拱顶正中的竖向裂缝影响最小;多条裂缝条件下的抗爆炸能力与单一裂缝相比没有明显区别,其抗爆炸能力的大小与各条裂缝单独存在时的最小抗爆炸能力相等。
The evaluation of anti-blasting ability of underground structures has become a new research subject since earthquake can seriously damage the underground structures. A semicircular arch structure with radius of arch of 3. 0 m and height of side wall of 3. 0 m is simulated,and seven kinds of cracks at different locations are presumed. True Grid is used to construct a mesh model,and then the anti-blasting ability of underground arch structure is numerically simulated by LS-DYNA. The results show that the anti-blasting ability of underground arch structure with a crack is dropped by more than 50%. The antiblasting ability of underground arch structure is affected by the location of cracks. The cracks between floor and side wall have the greatest effects on its anti-blasting ability and the cracks in arch crown have the least effects on its anti-blasting ability. The anti-blasting ability of arch structure with multi-cracks is not obviously different to that of arch structure with a single crack,and the anti-blasting ability is equal to the least value of anti-blasting ability when the cracks exist singly.
The evaluation of anti-blasting ability of underground structures has become a new research subject since earthquake can seriously damage the underground structures. A semicircular arch structure with radius of arch of 3. 0 m and height of side wall of 3. 0 m is simulated,and seven kinds of cracks at different locations are presumed. True Grid is used to construct a mesh model,and then the anti-blasting ability of underground arch structure is numerically simulated by LS-DYNA. The results show that the anti-blasting ability of underground arch structure with a crack is dropped by more than 50%. The antiblasting ability of underground arch structure is affected by the location of cracks. The cracks between floor and side wall have the greatest effects on its anti-blasting ability and the cracks in arch crown have the least effects on its anti-blasting ability. The anti-blasting ability of arch structure with multi-cracks is not obviously different to that of arch structure with a single crack,and the anti-blasting ability is equal to the least value of anti-blasting ability when the cracks exist singly.
引文
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[4]周健南,范华林,金丰年,等.非均布荷载作用下震后地下拱结构抗动载能力评估[J].工程力学,2012,29(增刊1):119-123,140.ZHOU Jian-nan,FAN Hua-lin,JIN Feng-nian,et al.Residual dynamic resistance assessment of seismic damaged underground arch under non-uniform explosion loading[J].Engineering Mechanics,2012,29(S1):119-123,140.(in Chinese)
[5]范鹏贤,王明洋,冯淑芳,等.直墙拱顶地下结构受爆炸地震波作用的动力响应[J].振动与冲击,2014,33(22):183-187.FAN Peng-xian,WANG Ming-yang,FENG Shu-fang,et al.Dynamic response of underground straight-wall-round-arch structure subjected to explosion seismic wave[J].Journal of Vibration and Shock,2014,33(22):183-187.(in Chinese)
[6]王光勇,顾金才,陈安敏,等.锚固洞室在顶爆作用下破坏形式及破坏过程研究[J].岩土工程学报,2015,37(8):1381-1389.WANG Guang-yong,GU Jin-cai,CHEN An-min,et al.Failure modes and process of tunnels reinforced by rockbolts under top explosion[J].Chinese Journal of Geotechnical Engineering,2015,37(8):1381-1389.(in Chinese)
[7]谢威,蒋美蓉,周健南,等.空爆作用下复合材料加固圆拱动力响应数值模拟[J].武汉理工大学学报,2014,36(1):135-139.XIE Wei,JIANG Mei-rong,ZHOU Jian-nan,et al.Numerical simulation on dynamic response of circular concrete arch strengthened with composite materials under air blast loading[J].Journal of Wuhan University of Technology,2014,36(1):135-139.(in Chinese)
[8]康婷,许金余,白应生,等.爆炸冲击荷载作用下拱结构的弹塑性动力响应研究[J].兵工学报,2013,34(9):1097-1102.KANG Ting,XU Jin-yu,BAI Ying-sheng,et al.Elastic-plastic analysis on dynamic response of arch subjected to explosive impact[J].Acta Armamentarii,2013,34(9):1097-1102.(in Chinese)
[9]Tu Z G,Lu Y.Evaluation of typical concrete material model used in hydrocodes for high dynamic response simulations[J].International Journal of Impact Engineering,2009,36(1):132-146.
[10]贾彬,李正良,陶俊林,等.混凝土SHPB试验数值模拟研究[J].固体力学学报,2010,31(增刊1):216-221.JIA Bin,LI Zheng-liang,TAO Jun-lin,et al.Research on numerical simulation of SHPB concrete tests[J].Chinese Journal of Solid Mechanics,2010,31(S1):216-221.(in Chinese)
[11]田力,朱聪,王浩,等.碰撞冲击荷载作用下钢筋混凝土柱的动态响应及破坏模式[J].工程力学,2013,30(2):150-155.TIAN Li,ZHU Cong,WANG Hao,et al.Dynamic response and failure modes of RC columns under impact[J].Engineering Mechanics,2013,30(2):150-155.(in Chinese)