基于地表冲击荷载作用下的城市地下空间结构动力响应分析
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摘要
由于地震效应、重载车辆的震动效应或由于不同爆炸物引起的强烈冲击效应,都会给城市地下空间结构带来较大的影响。通过土体的混凝土改进剑桥动力本构模型和混凝土塑性损伤本构模型,建立地表爆炸冲压荷载简化计算模型,对城市地下空间结构在TNT当量100 kg的炸药爆炸冲压荷载作用下进行了动力分析,研究了结构埋深、土体刚度对结构动力响应的影响,分析了远场爆炸地震波作用下地下空间结构的动力响应。计算结果表明,地下空间结构中部顶板产生了轻微的拉伸损伤;当埋深小于5 m时,结构动应力响应较大;结构覆盖土刚度越小,土对爆炸能量的吸收作用越显著;由于爆炸产生的地震波频率高,其对结构动应力的影响较小。研究结果对地下结构的抗爆设计具有一定的参考意义。
In order to study the dynamic response of subway station structure subjected to surface ground explosion,a simplified model of airblast forces is demonstrated in detail.Whereafter,the improved concrete dynamic Cam-Clay model of soil and the concrete damaged plasticity constitutive model are used for the dynamic analysis of subway station when 100 kg TNT detonates on ground surface.Meanwhile,the influences of soil stiffness and buried depth on dynamic response of subway station are taken into consideration.Finally,the dynamic response of station structural subjected to far-field explosion wave is analyzed.The results show that,the central roof of station has small tension damage.When the buried depth is less than 5 m,the dynamic stress is larger.The smaller the covering soil stiffness is,the more energy of the explosion the covering soil absorb.As the frequency of the explosion waves is very larger,the dynamic stress of the station subjected to far-field explosion wave is smaller.The results will be benefit anti-explosion design of underground structures.
In order to study the dynamic response of subway station structure subjected to surface ground explosion,a simplified model of airblast forces is demonstrated in detail.Whereafter,the improved concrete dynamic Cam-Clay model of soil and the concrete damaged plasticity constitutive model are used for the dynamic analysis of subway station when 100 kg TNT detonates on ground surface.Meanwhile,the influences of soil stiffness and buried depth on dynamic response of subway station are taken into consideration.Finally,the dynamic response of station structural subjected to far-field explosion wave is analyzed.The results show that,the central roof of station has small tension damage.When the buried depth is less than 5 m,the dynamic stress is larger.The smaller the covering soil stiffness is,the more energy of the explosion the covering soil absorb.As the frequency of the explosion waves is very larger,the dynamic stress of the station subjected to far-field explosion wave is smaller.The results will be benefit anti-explosion design of underground structures.
引文
[1]CHOI S,WANG J,MUNFAKH G,et al.3D nonlinearblast model analysis for underground structures[C]//GeoCongress 2006.Atlanta:Geotechnical Engineering inthe Information Technology Age,2006.
[2]LU Y,WANG Z,CHONG K.A comparative study ofburied structure in soil subjected to blast load using 2Dand 3D numerical simulations[J].Soil Dynamics andEarthquake Engineering,2005,25(3):275-288.
[3]刘晶波,杜义欣,闫秋实,等.地下箱形结构在爆炸冲击荷载作用下的动力反应分析[J].解放军理工大学学报(自然科学版),2007,8(5):520-524.LIU Jing-bo,DU Yi-xin,YAN Qiu-shi.Dynamic responseof underground box structures subjected to blast load[J].Journal of PLA University of Science and Technology,2007,8(5):520-524
[4]杜修力,廖维张,田志敏,等.炸药爆炸作用下地下结构的动力响应分析[J].爆炸与冲击,2006,26(5):474-480.DU Xiu-li,LIAO Wei-zhang,TIAN Zhi-min,et al.Dynamic response analysis of underground structuresunder explosion-induced loads[J].Explosion and ShockWaves,2006,26(5):474-480.
[5]罗昆升,王勇,赵跃堂.地铁区间隧道在地面爆炸荷载作用下的数值模拟[J].解放军理工大学学报(自然科学版),2007,8(6):674-679.LUO Kun-sheng,WANG Yong,ZHAO Yue-tang,et al.Numerical simulation of section subway tunnel undersurface explosion[J].Journal of PLA University ofScience and Technology,2007,8(6):674-679.
[6]国胜兵,王明洋,赵跃堂,等.爆炸地震波作用下地下结构动力响应数值分析[J].世界地震工程,2004,20(4):137-142.GUO Sheng-bing,WANG Ming-yang,ZHAO Yue-tang,et al.Dynamic numerical analysis of undergroundstructures under action of explosion seismic wave[J].World Earthquake Engineering,2004,20(4):137-142.
[7]WU CHENGQING,HAO HONG.Modeling ofsimultaneous ground shock and air blast pressure onnearby structures from surface explosions[J].Inter-national Journal of Impact Engineering,2005,31(6):699-717.
[8]GWINNER J,BROSOWSKI B.A penalty approximationfor a unilateral contact problem in non-linear elasticity[J].Mathematical Methods in the Applied Sciences,1989,11(4):447-458.
[9]CARTER J P,BOOKER J R,WROTH C P.A critical statesoil model for cyclic loading[C]//Soil Mechanics——Transient and Cyclic Loads.London:John Wiley and Son,1982:219-252.
[10]LEE JEELO,FENVES GREGORY L.Plastic damagemodel for cyclic loading of concrete structures[J].Journal of Engineering Mechanics,1998,112(4):892-900.0.0 0.2 0.4 0.6 0.8 1.0-8-4048力应/kPa时间/s
[2]LU Y,WANG Z,CHONG K.A comparative study ofburied structure in soil subjected to blast load using 2Dand 3D numerical simulations[J].Soil Dynamics andEarthquake Engineering,2005,25(3):275-288.
[3]刘晶波,杜义欣,闫秋实,等.地下箱形结构在爆炸冲击荷载作用下的动力反应分析[J].解放军理工大学学报(自然科学版),2007,8(5):520-524.LIU Jing-bo,DU Yi-xin,YAN Qiu-shi.Dynamic responseof underground box structures subjected to blast load[J].Journal of PLA University of Science and Technology,2007,8(5):520-524
[4]杜修力,廖维张,田志敏,等.炸药爆炸作用下地下结构的动力响应分析[J].爆炸与冲击,2006,26(5):474-480.DU Xiu-li,LIAO Wei-zhang,TIAN Zhi-min,et al.Dynamic response analysis of underground structuresunder explosion-induced loads[J].Explosion and ShockWaves,2006,26(5):474-480.
[5]罗昆升,王勇,赵跃堂.地铁区间隧道在地面爆炸荷载作用下的数值模拟[J].解放军理工大学学报(自然科学版),2007,8(6):674-679.LUO Kun-sheng,WANG Yong,ZHAO Yue-tang,et al.Numerical simulation of section subway tunnel undersurface explosion[J].Journal of PLA University ofScience and Technology,2007,8(6):674-679.
[6]国胜兵,王明洋,赵跃堂,等.爆炸地震波作用下地下结构动力响应数值分析[J].世界地震工程,2004,20(4):137-142.GUO Sheng-bing,WANG Ming-yang,ZHAO Yue-tang,et al.Dynamic numerical analysis of undergroundstructures under action of explosion seismic wave[J].World Earthquake Engineering,2004,20(4):137-142.
[7]WU CHENGQING,HAO HONG.Modeling ofsimultaneous ground shock and air blast pressure onnearby structures from surface explosions[J].Inter-national Journal of Impact Engineering,2005,31(6):699-717.
[8]GWINNER J,BROSOWSKI B.A penalty approximationfor a unilateral contact problem in non-linear elasticity[J].Mathematical Methods in the Applied Sciences,1989,11(4):447-458.
[9]CARTER J P,BOOKER J R,WROTH C P.A critical statesoil model for cyclic loading[C]//Soil Mechanics——Transient and Cyclic Loads.London:John Wiley and Son,1982:219-252.
[10]LEE JEELO,FENVES GREGORY L.Plastic damagemodel for cyclic loading of concrete structures[J].Journal of Engineering Mechanics,1998,112(4):892-900.0.0 0.2 0.4 0.6 0.8 1.0-8-4048力应/kPa时间/s
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