地基与密肋复合墙结构相互作用系统频域地震响应试验研究
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摘要
为研究地震作用下黄土地基与密肋复合墙结构相互作用系统频域地震响应的基本规律,进行了1:15比例结构模型进行振动台试验。输入白噪声、El-Centro波、天津波,测试了结构与地基的动力响应。通过快速傅里叶变化得到频域响应曲线,分析了地基与结构的动力特性以及从7度至9度水平向地震波加载时的动力反应,对比了各加载工况下加速度及位移频域响应曲线,研究了地基、结构频域动力响应的基本规律及其影响因素。结果表明:地震波激励下地基土开裂,自振频率降低,对上部结构的嵌固作用减弱;地基表面与结构顶部加速度响应随烈度的提高而增大,峰值所对应频率的变化显著,地基对加速度的放大效应显著,上部结构对位移的放大效应显著。因此,考虑地基与结构相互作用后,动力放大效应与地基破坏状况及地震动特性密切相关。
In order to study the seismic response of the interaction systems assembled by multi-ribbed composite wall structure and subsoil in frequency domain, a series of shake table tests was carried out using a model scaled in 1/15. The dynamic responses of the structure and subsoil were studied by inputting white noise, El-Centro wave, Tianjin wave in the tests. The response curve was obtained in frequency domain by Fast Fourier Transform, and the dynamic characteristics of the foundation and structure as well as their dynamic responses from 7 degree to 9 degree along horizontal axis loading were analyzed. The frequency response curves of the acceleration and displacement under different loading conditions were comparatively investigated. The dynamic frequency responses of the foundation and structure and their influencing factors were also examined. It was found that the fixing effects of subsoil for the superstructure are lessened, and the vibration frequencies decrease after the subsoil crack affected by the earthquake wave. The acceleration responses are amplified at the subsoil surface and the structure top with increasing the intensity, the frequencies corresponding peak response vary remarkably. The amplification effect of foundation on acceleration is remarkable, and the amplification effect of superstructure on displacement is significant. Therefore, the dynamic amplification effect is closely related to the destruction of subsoil and earthquake ground motion characteristics when considering the interaction between subsoil and structure.
In order to study the seismic response of the interaction systems assembled by multi-ribbed composite wall structure and subsoil in frequency domain, a series of shake table tests was carried out using a model scaled in 1/15. The dynamic responses of the structure and subsoil were studied by inputting white noise, El-Centro wave, Tianjin wave in the tests. The response curve was obtained in frequency domain by Fast Fourier Transform, and the dynamic characteristics of the foundation and structure as well as their dynamic responses from 7 degree to 9 degree along horizontal axis loading were analyzed. The frequency response curves of the acceleration and displacement under different loading conditions were comparatively investigated. The dynamic frequency responses of the foundation and structure and their influencing factors were also examined. It was found that the fixing effects of subsoil for the superstructure are lessened, and the vibration frequencies decrease after the subsoil crack affected by the earthquake wave. The acceleration responses are amplified at the subsoil surface and the structure top with increasing the intensity, the frequencies corresponding peak response vary remarkably. The amplification effect of foundation on acceleration is remarkable, and the amplification effect of superstructure on displacement is significant. Therefore, the dynamic amplification effect is closely related to the destruction of subsoil and earthquake ground motion characteristics when considering the interaction between subsoil and structure.
引文
[1]尚守平,鲁华伟,邹新平,等.土与结构相互作用大比例模型试验研究[J].工程力学,2013,30(9):41-46.SHANG Shou-ping,LU Hua-wei,ZOU Xin-ping,et al.Experimental study on soil-structure interaction through large scale model tests[J].Engineering Mechanics,2013,30(9):41-46.
[2]尚守平,邹新平,曹万林.钢框架-筏基结构与土相互作用试验研究[J].建筑结构学报,2012,33(9):74-80.SHANG Shou-ping,ZOU Xin-ping,CAO Wan-lin.Experimental investigation on soil-structure interaction of steel frame-raft foundation[J].Journal of Building Structures,2012,33(9):74-80.
[3]陈跃庆,吕西林,李培振,等.不同土性的地基-结构动力相互作用振动台模型试验对比研究[J].土木工程学报,2006,39(5):57-64.CHEN Yue-qing,LüXi-lin,LI Pei-zhen,et al.Comparative study on dynamic soil-structure interaction system with various soil by using shaking table model tests[J].China Civil Engineering Journal,2006,39(5):57-64.
[4]陈灯红,杜成斌.结构-地基动力相互作用的时域模型[J].岩土力学,2014,35(4):1164-1172.CHEN Deng-hong,DU Cheng-bin.A computational model for structure-foundation dynamic interaction in time domain[J].Rock and Soil Mechanics,2014,35(4):1164-1172.
[5]尹训强,金煜皓,王桂萱.考虑土-结构相互作用效应和土质地基非线性的核岛厂房结构地震响应分析[J].岩土力学,2017,38(4):1114-1120.YIN Xun-qiang,JIN Yu-hao,WANG Gui-xuan.Seismic response analysis of nuclear island buildings considering soil-structure interaction and nonlinear soil foundation[J].Rock and Soil Mechanics,2017,38(4):1114-1120.
[6]王国波,于艳丽,蒋沧如,等.地基土模型对土-结构相互作用体系地震响应影响的初步分析[J].岩石力学与工程学报,2014,33(增刊2):4264-4270.WANG Guo-bo,YU Yan-li,JIANG Cang-ru,et al.Preliminary analysis of influence of soil models on seismic response of soil-structure interaction system[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(Suppl.2):4264-4270.
[7]夏栋舟,何益斌,刘建华.土-结构动力相互作用体系阻尼及地震反应分析[J].岩土力学,2009,30(10):2923-2928.XIA Dong-zhou,HE Yi-bin,LIU Jian-hua.Study of damping property and seismic action effect for soil-structure dynamic interaction system[J].Rock and Soil Mechanics,2009,30(10):2923-2928.
[8]蒋玉敏,钱德玲,张泽涵,等.框架-核心筒结构与地基基础动力相互作用振动台试验研究[J].建筑结构学报,2016,37(2):34-40.JIANG Yu-min,QIAN De-ling,ZHANG Ze-han,et al.Shaking table tests on dynamic interaction of frame-core tube structure and subgrade[J].Journal of Building Structures,2016,37(2):34-40.
[9]朱超,庄海洋,于旭,等.土-桩-隔震结构动力相互作用体系振动反应特性试验研究[J].岩土工程学报,2015,37(12):2182-2188.ZHU Chao,ZHUANG Hai-yang,YU Xu,et al.Experimental study on vibration characteristics of soil-pile-isolated structure dynamic interaction system[J].Chinese Journal of Geotechnical Engineering,2015,37(12):2182-2188.
[10]姚谦峰,陈平,张荫,等.密肋壁板轻框结构节能住宅体系研究[J].工业建筑,2003,33(1):1-5.YAO Qian-feng,CHEN Ping,ZHANG Yin,et al.Study on energy-saving residential system of multi-ribbed wall slab with light-weight outer frame[J].Industrial Construction,2003,33(1):1-5.
[11]姚谦峰,袁泉.小高层密肋壁板轻框结构模型振动台试验研究[J].建筑结构学报,2003,24(1):59-63.YAO Qian-feng,YUAN Quan.Study on shaking table test of a 1/10 scale high-rise multi-rib wall plate slab lightweight frame mode[J].Journal of Building Structures,2003,24(1):59-63.
[12]袁泉,何玉阳.框支密肋复合墙结构模型振动台试验研究[J].振动与冲击,2014,33(22):72-77.YUAN Quan,HE Yu-yang.Tests for a seismic performance of a multi-grid composite wall structure system[J].Journal of Vibration and Shock,2014,33(22):72-77.
[13]何玉阳,袁泉.框支密肋复合墙结构振动台试验与数值模拟分析[J].振动与冲击,2015,34(13):205-210.HE Yu-yang,YUAN Quan.Frame-supported multi-ribbed composite wall shaking table test and numerical simulation analysis[J].Journal of Vibration and Shock,2015,34(13):205-210.
[2]尚守平,邹新平,曹万林.钢框架-筏基结构与土相互作用试验研究[J].建筑结构学报,2012,33(9):74-80.SHANG Shou-ping,ZOU Xin-ping,CAO Wan-lin.Experimental investigation on soil-structure interaction of steel frame-raft foundation[J].Journal of Building Structures,2012,33(9):74-80.
[3]陈跃庆,吕西林,李培振,等.不同土性的地基-结构动力相互作用振动台模型试验对比研究[J].土木工程学报,2006,39(5):57-64.CHEN Yue-qing,LüXi-lin,LI Pei-zhen,et al.Comparative study on dynamic soil-structure interaction system with various soil by using shaking table model tests[J].China Civil Engineering Journal,2006,39(5):57-64.
[4]陈灯红,杜成斌.结构-地基动力相互作用的时域模型[J].岩土力学,2014,35(4):1164-1172.CHEN Deng-hong,DU Cheng-bin.A computational model for structure-foundation dynamic interaction in time domain[J].Rock and Soil Mechanics,2014,35(4):1164-1172.
[5]尹训强,金煜皓,王桂萱.考虑土-结构相互作用效应和土质地基非线性的核岛厂房结构地震响应分析[J].岩土力学,2017,38(4):1114-1120.YIN Xun-qiang,JIN Yu-hao,WANG Gui-xuan.Seismic response analysis of nuclear island buildings considering soil-structure interaction and nonlinear soil foundation[J].Rock and Soil Mechanics,2017,38(4):1114-1120.
[6]王国波,于艳丽,蒋沧如,等.地基土模型对土-结构相互作用体系地震响应影响的初步分析[J].岩石力学与工程学报,2014,33(增刊2):4264-4270.WANG Guo-bo,YU Yan-li,JIANG Cang-ru,et al.Preliminary analysis of influence of soil models on seismic response of soil-structure interaction system[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(Suppl.2):4264-4270.
[7]夏栋舟,何益斌,刘建华.土-结构动力相互作用体系阻尼及地震反应分析[J].岩土力学,2009,30(10):2923-2928.XIA Dong-zhou,HE Yi-bin,LIU Jian-hua.Study of damping property and seismic action effect for soil-structure dynamic interaction system[J].Rock and Soil Mechanics,2009,30(10):2923-2928.
[8]蒋玉敏,钱德玲,张泽涵,等.框架-核心筒结构与地基基础动力相互作用振动台试验研究[J].建筑结构学报,2016,37(2):34-40.JIANG Yu-min,QIAN De-ling,ZHANG Ze-han,et al.Shaking table tests on dynamic interaction of frame-core tube structure and subgrade[J].Journal of Building Structures,2016,37(2):34-40.
[9]朱超,庄海洋,于旭,等.土-桩-隔震结构动力相互作用体系振动反应特性试验研究[J].岩土工程学报,2015,37(12):2182-2188.ZHU Chao,ZHUANG Hai-yang,YU Xu,et al.Experimental study on vibration characteristics of soil-pile-isolated structure dynamic interaction system[J].Chinese Journal of Geotechnical Engineering,2015,37(12):2182-2188.
[10]姚谦峰,陈平,张荫,等.密肋壁板轻框结构节能住宅体系研究[J].工业建筑,2003,33(1):1-5.YAO Qian-feng,CHEN Ping,ZHANG Yin,et al.Study on energy-saving residential system of multi-ribbed wall slab with light-weight outer frame[J].Industrial Construction,2003,33(1):1-5.
[11]姚谦峰,袁泉.小高层密肋壁板轻框结构模型振动台试验研究[J].建筑结构学报,2003,24(1):59-63.YAO Qian-feng,YUAN Quan.Study on shaking table test of a 1/10 scale high-rise multi-rib wall plate slab lightweight frame mode[J].Journal of Building Structures,2003,24(1):59-63.
[12]袁泉,何玉阳.框支密肋复合墙结构模型振动台试验研究[J].振动与冲击,2014,33(22):72-77.YUAN Quan,HE Yu-yang.Tests for a seismic performance of a multi-grid composite wall structure system[J].Journal of Vibration and Shock,2014,33(22):72-77.
[13]何玉阳,袁泉.框支密肋复合墙结构振动台试验与数值模拟分析[J].振动与冲击,2015,34(13):205-210.HE Yu-yang,YUAN Quan.Frame-supported multi-ribbed composite wall shaking table test and numerical simulation analysis[J].Journal of Vibration and Shock,2015,34(13):205-210.