爆炸地震动下储液结构动力响应试验研究  

Test study on dynamic response of liquid storage structure under explosion ground motion

作　　者：张浩天 赵雪川 宋春明 吴红晓 郑际镜 岳松林 程怡豪 ZHANG Haotian;ZHAO Xuechuan;SONG Chunming;WU Hongxiao;ZHENG Jijing;YUE Songlin;CHENG Yihao(State Key Laboratory of Disaster Prevention&Mitigation of Explosion&Impact,Army Engineering University of PLA,Nanjing 210007,China;96911 of PLA,Beijing 100010,China)

机构地区：[1]陆军工程大学爆炸冲击防灾减灾国家重点实验室,南京210007 [2]96911部队,北京100010

出　　处：《振动与冲击》2022年第21期97-108,128,共13页Journal of Vibration and Shock

摘　　要：储液结构(LSS)关乎战略资源的储备安全,在国防工程建设中备受关注,需要考虑武器爆炸时强烈冲击地震动对其动力响应的影响。利用爆炸冲击震动模拟平台开展了地面式矩形储液结构模型试验,研究了不同储液状态下储液结构在爆炸地震动下的动力响应,分析了地震动强度对结构振动加速度、结构应变以及动水压力的影响。此外,结合理论方法对储液结构壁板振型进行了探讨,对动水压力计算及相关设计规范的准确性与安全性进行了讨论。结果表明:储液增加使液固体系固有频率下降;结构动力响应与地震动峰值加速度相关性较高,随着地震动增强,不同储液状态下结构振动加速度、应变和动水压力均表现出强化效应;相较于无液状态,储液状态下结构动力响应随地震动强度变化敏感性提高,表现出更加显著的地震动强化效应;等强度地震动下,结构动力响应随储液增加而增强,说明储液结构处于高液位状态更加不利;沿壁板底部至顶部,结构振动加速度呈现放大效应,结构竖向变形符合剪切梁悬臂模型;动水压力的主要组成为脉冲压力,液面以下随水深增加呈现先增大后减小的趋势。动水压力标准值理论计算值偏于安全,基于理论方法修正了动水压力系数,给出了倾覆力矩系数。Liquid storage structure(LSS) is related to storage safety of strategic resources,and has received much attention in construction of national defense projects.It is necessary to consider effects of strong shock ground motion on its dynamic response when weapons blasting.Here,model tests of ground type rectangular liquid storage structure were conducted by using a blast impact shock analog platform to study dynamic response of liquid storage structure under explosion ground motion and different liquid storage states,and analyze effects of ground motion intensity on structural vibration acceleration,structural strain and hydrodynamic pressure.Besides,combined with the theoretical method,vibration modal shapes of wall plate of liquid storage structure were explored,and the accuracy and safety of hydrodynamic pressure calculation and related design specifications were discussed.The results showed that natural frequencies of liquid-solid system decrease with increase in liquid storage;the correlation between structure dynamic response and ground motion peak acceleration is higher;with ground motion intensifying,structure vibration acceleration,strain and hydrodynamic pressure under different liquid storage states have strengthening effects;compared with no liquid state,the sensitivity of structural dynamic response under liquid storage state with change of ground motion intensity is improved to reveal a more significant ground motion strengthening effect;under equal intensity ground motion,structure dynamic response increases with increase in liquid storage,so liquid storage structure with high liquid level is more unfavorable;from wall plate bottom to top,structure vibration acceleration has amplification effect,and structure vertical deformation conforms to shear beam cantilever model;main component of hydrodynamic pressure is pulse pressure,below liquid surface,it increases firstly and then decreases with increase in liquid depth;the theoretical calculation value of hydrodynamic pressure standard value is partial t

关 键 词：储液结构(LSS) 爆炸地震动 振动加速度 变形 动水压力 

分 类 号：TV32[水利工程—水工结构工程]