大型复杂动力机器基础参振质量的概念、理论及应用  

Concept,theoretical and application of participating mass of large-scale complex dynamic machine foundation

作　　者：巴振宁 符瞻远[1,3] 韩庆华 梁建文 刘铭劼[1,2,3] 张晋元 BA Zhenning;FU Zhanyuan;HAN Qinghua;LIANG Jianwen;LIU Mingjie;ZHANG Jinyuan(Key Laboratory of Earthquake Engineering Simulation and Seismic Resilience of China Earthquake Administration(Tianjin University),Tianjin 300350,China;Key Laboratory of Coast Civil Structure Safety of China Ministry of Education(Tianjin University),Tianjin 300350,China;School of Civil Engineering,Tianjin University,Tianjin 300350,China)

机构地区：[1]中国地震局地震工程综合模拟与城乡抗震韧性重点实验室(天津大学),天津300350 [2]滨海土木工程结构与安全教育部重点实验室(天津大学),天津300350 [3]天津大学建筑工程学院,天津300350

出　　处：《地震工程与工程振动》2023年第3期56-68,共13页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(U1939208)。

摘　　要：为满足大型动力机器设备的性能及工艺需求,动力机器基础正朝着大尺寸和构造形式复杂的方向发展。动力荷载作用下,大型复杂动力机器基础自身各部分的振动难以保持同步,即无法完全参振,此时,现有的将基础整体视为刚体进行动力设计的相关国家标准规范不再适用。参考基础动力设计分析中十分重要的地基土参振质量(基础振动时周围地基土同步参振的质量)概念,将大型复杂动力机器基础考虑为由核心实体刚体部分与外围附属弹性体部分组成的刚体-弹性体系统,提出了大型复杂动力机器基础参振质量的概念(核心刚体质量与外围弹性体同步参振质量之和),进而基于弹性半空间理论体系给出了理论求解公式和相应的数值求解流程,并以天津大学在建国家大型地震工程模拟研究设施中的大型地震模拟振动台基础为例,建立了精细化基础-桩基-地基土整体模型,分析了工作荷载作用下基础参振质量。数值结果表明:该基础参振质量总体可达80%以上,基础振动同步性较好。基于文中提出的参振质量概念和数值求解步骤,开展基础参振质量分析,可从振动同步性角度评估基础动力设计的合理性,为大型复杂动力机器基础的动力设计提供支撑。In order to meet the performance and technological requirements of large-scale dynamic machine,the foundation of which is developing in the direction of large size and complex structure.Under the action of dynamic load,it is difficult to keep the vibration of various parts synchronized,that is,unable to fully participate in the vibration.At this time,the existing relevant national standards which regard the foundation as a rigid body are no longer applicable.With the reference to the concept of foundation soil participating mass(the mass of surrounding foundation soil synchronously participating in foundation),the large-sacle complex dynamic machine foundation is considered as a rigid-elastomer system composed of the rigid part of the core body and the peripheral elastic body.The concept of self-participating mass of large-scale complex dynamic machine foundation(the sum of core rigid body mass and peripheral elastic body synchronous vibration mass)is proposed,and the theoretical solution formula and corresponding numerical solution flow are given based on the elastic half-space theory system.Taking the large-scale earthquake simulation shaking table foundation of the National Facility for Earthquake Engineering Simulation(NFEES)of Tianjin University as an instance.The whole model of fine foundation-pile-foundation soil is established,and the participating mass of the foundation itself under working load is analyzed.The numerical results show that the overall participating mass of the foundation can reach more than 80%,and the vibration synchronization of the foundation performs well.Based on the concept and numerical solution flow of participating mass proposed in this paper,the analysis of foundation self-participating vibration mass can evaluate the rationality of foundation dynamic design from the point of view of vibration synchronization and provide support for the dynamic design of large-scale complex dynamic machine foundation.

关 键 词：动力机器基础 基础参振质量 地震模拟振动台 刚体-弹性体系统 有限元 

分 类 号：TU4[建筑科学—土工工程]