Nonlinear seismic responses of a hydropower house under near-fault ground motions oblique input
WANG Fei1, SONG Zhiqiang1, LU Tao2
1.Institute of Water Resources and Hydro-Electric Engineering, Xi’an University of Technology, Xi’an 710048, China;
2.Jiangxi Provincial Water Conservancy Planning Design and Research Institute, Nanchang 330029, China
Abstract:Compared with remote ground motions, near-fault ground motions perhaps have larger velocity and displacement pulse effect.As the buried depth of seismic fault is shallow, the assumption of vertical surface incidence of seismic waves is generally no longer applicable.Until now, the aseismic study on hydropower house has not considered influences of near-fault pulse-type ground motion oblique input.Here, 5 near-fault pulse-type ground motion records and 5 near-fault non-pulse type ground motion ones were chosen to meet site conditions of a certain hydropower house and taken as inputs.According to the wave theory, the viscoelastic dynamic artificial boundary method was used to derive calculation formulas of equivalent node forces of artificial boundary under SV wave 3-D oblique incidence.These formulas were verified with examples.A finite element analysis model for 3-D plastic damage of hydropower house was established to analyze its nonlinear seismic responses under vertical and oblique incidences of near-fault pulse-type and non-pulse type ground motions.The results showed that near-fault pulse-type ground motions oblique input can excite high-order modal shapes of a hydropower house structure, cause its lower structure’s larger damage, displacement and stress responses, and have the strongest destructive effect on it.
王飞1,宋志强1,卢韬2. 近断层地震动斜输入下水电站厂房非线性地震响应研究[J]. 振动与冲击, 2020, 39(5): 63-73.
WANG Fei1, SONG Zhiqiang1, LU Tao2. Nonlinear seismic responses of a hydropower house under near-fault ground motions oblique input. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(5): 63-73.
[1] BRAY J D, RODRIGUEZ-MAREK A. Characterization of forward-directivity ground motions in the near-fault region[J]. Soil Dynamics & Earthquake Engineering, 2004, 24(11): 815-828.
[2] YANG D X, WANG W. Nonlocal period parameters of frequency content characterization for near-fault ground motions[J]. Earthquake Engineering and Structural Dynamics, 2012,41(13):1793-1811.
[3] 刘启方, 袁一凡, 金星, 等. 近断层地震动基本特征[J]. 地震工程与工程振动, 2006, 26(1):01-10.
LIU Q F, YUAN Y F, JIN X, et al. Basic characteristics of near-fault ground motion[J]. Earthquake Engineering and Engineering Vibration,2006,26(1) : 1-10.
[4] 杨迪雄, 李刚, 程耿东. 近断层脉冲型地震动作用下隔震结构地震反应分析[J]. 地震工程与工程振动, 2005, 25(02):119-125.
YANG D X, LI G, CHENG G D. Seismic analysis of base-isolated structures subjected to near-fault pulse-like ground motions[J]. Earthquake Engineering and Engineering Vibration,2005,25(02):119-125.
[5] 杨迪雄, 赵岩. 近断层地震动破裂向前方向性与滑冲效应对隔震建筑结构抗震性能的影响[J]. 地震学报, 2010, 32(05):579-587.
YANG D X, ZHAO X. Effects of rupture forward directivity and fling step of near-fault ground motions on seismic performance of base-isolated building structure[J]. Acta Seismologica Sinica, 2010,32(5): 579-587.
[6] BAYRAKTAR A, TÜRKER T, AKKOSE M, et al. The effect of reservoir length on seismic performance of gravity dams to near-and far-fault ground motions[J]. Nat Hazards, 2010, 52: 257-275.
[7] HUANG J J. Earthquake damage analysis of concrete gravity dams:Modeling and behavior under near-Fault seismic excitations [J]. Journal of Earthquake Engineering, 2015,19(7):1037-1085.
[8] 邹德高, 韩慧超, 孔宪京,等.近断层脉冲型地震动作用下面板堆石坝的动力响应[J]. 水利学报, 2017, 48(01):78-85.
ZOU Z G, HAN H C, KONG X J, et al. Seismic response of a concrete-faced rockfill dam to near-fault pulse-like ground motions[J]. Journal of Hydraulic Engineering,2017,48(1):78-85.
[9] ZOU Z G, HAN H C, LIU J M , et al. Seismic failure analysis for a high concrete face rockfill dam subjected to near-fault pulse-like ground motions [J]. Soil Dynamics and Earthquake Engineering,2017,98:235-243.
[10] 张社荣, 王宽, 王高辉, 等.近断层地震动方向性效应对混凝土重力坝累积损伤特性的影响[J]. 地震工程与工程振动, 2014, 34(1):44-53.
ZHANG S R, WANG K, WANG G H, et al. Effects of the directivity of near fault ground motions on accumulated damage of concrete gravity dams[J]. Earthquake Engineering and Engineering Vibration,2014,34(1):44-53.
[11] 王亚楠, 杜永峰, 胡高兴. 脉冲型地震下隔震结构的等强度位移需求谱研究[J]. 振动与冲击,2018,37(1):85-89.
WANG Y N, DU Y F, HU G X. Constant-strength displacement demand spectra of base-isolated structures under pulse-like ground motions[J]. Journal of Vibration and Shock,2018,37(1):85-89.
[12] 徐海滨, 杜修力, 赵密, 等. 地震波斜入射对高拱坝地震反应的影响[J]. 水力发电学报,2011,30(6):159-165.
XU H B, DU X L, ZHAO M, et al. Effect of oblique incidence of seismic waves on seismic responses of high arch dam[J]. Journal of Hydroelectric Engineering,2011,30(6):159-165.
[13] 杜修力, 徐海滨, 赵密. SV波斜入射下高拱坝地震反应分析[J]. 水力发电学报, 2015, 34(4):139-145.
DU X L, XU H B, ZHAO M. Analysis on seismic responses of high arch dam to SV waves of oblique incidence[J]. Journal of Hydroelectric Engineering,2015,34(4): 139-145.
[14] 黄景琦,杜修力,田志敏,等. 斜入射SV 波对地铁车站地震响应的影响[J].工程力学,2014,31(9):81-89.
HUANG J Q, DU X L,TIAN Z M, et al. Effect of the oblique incidence of seismic SV waves on the seismic response of subway station structure[J]. Engineering Mechanics, 2014,31(9):81-89.
[15] HUANG J Q, ZHAO M, Du X L. Non-linear Seismic Responses of tunnels within normal fault ground under obliquely incident P Waves[J]. Tunnelling and Underground Space Technology, 2017, 61: 26-39.
[16] HUANG J Q, DU X L, JIN L. Impact of incident angles of P waves on the dynamic responses of long lined tunnels[J]. Earthquake Engineering & Structural Dynamics,2016, 45(15):2435-2454.
[17] 郭峰. 抗震设计中有关场地的若干问题研究[D].武汉:华中科技大学,2010.
GUO F. Research on some issues of site for seismic design[D]. Wuhan:Huazhong University of Science and Technology,2010.
[18] 张冰. 近场地震作用下框架与桥梁结构抗震分析[D].长沙:湖南大学,2007.
ZHANG B. Seismic analysis of frame and bridge structure under near-field ground motions[D].Changsha:Hunan University,2007.
[19] 何建涛, 马怀发, 张伯艳, 等. 黏弹性人工边界地震动输入方法及实现[J]. 水利学报, 2010, 41(8):960-969.
He J T, MA H F, ZHANG B Y, et al. Method and realization of seismic motion input of viscous-spring boundary[J].Journal of Hydraulic Engineering, 2010,41(8): 960–969.
[20] SONG Z Q, SU C H. Computation of Rayleigh Damping Coefficients for the Seismic Analysis of a Hydro-Powerhouse[J]. Shock and Vibration, 2017, 2017(2):1-11.
[21] 高峰, 赵冯兵. 地下结构静-动力分析中的人工边界转换方法研究[J].振动与冲击, 2011,30(11) :165-170.
GAO F, ZHAO F B. Study on transformation method for artificial boundaries in static-dynamic analysis of underground structure[J]. Journal of Vibration and Shock,2011,30(11): 165-170.
[22] GB 50010-2010,混凝土结构设计规范[S].
GB 50010-2010, Code for design of concrete structures [S].
[23] NB 35047-2015,水电工程水工建筑物抗震设计规范[S].
NB 35047-2015, Code for seismic design of hydraulic structures of hydropower project[S].
[24] 郝军刚,胡 蕾,伍鹤皋,等. 罕遇地震作用下水电站厂房上部结构破坏模式研究[J].振动与冲击, 2016,35(3):55-61.
HAO J G, HU L,WU H G, et al. Failure modes of hydropower house superstructure under rare earthquake action[J]. Journal of Vibration and Shock,2016,35(3): 55-61.