摘要
结合110/220 kV变电站主体建筑基础的特点,提出一种用于变电站建筑的新型模块化装配式基础。基于某变电站上部建筑结构荷载设计了新型模块化装配式基础,进行了新型基础的足尺试验和有限元分析,研究其在偏心受压作用下的承载性能。试验和有限元分析结果表明:新型模块化装配式基础具有良好的承载能力、变形特性,以及具备良好的整体性,能够满足变电站建筑结构的基础设计要求;在加载过程中底座湿接缝处的钢筋较早屈服,在实际工程中可以适当加强湿接缝的强度;有限元分析与实验结果基本吻合,验证了理论分析的正确性;基座底座板厚比为1.1时,新型模块化装配式基础的力学性能最为优越;抗剪键截面尺寸对基础的承载力有一定影响,大尺寸的抗剪键能提高基础的初始刚度,但抗剪键的尺寸过大会导致底座对应的抗剪键槽变大,降低底座的有效厚度,加速基础的刚度退化;使用UHPC材料作为湿接缝的填充材料,可提高基础的承载性能。
Combining with the characteristics of the main building foundations for 110/220 kV substations,this paper proposes a new-type modular prefabricated foundation for substation buildings.A new-type modular prefabricated foundation is designed based on the load of the upper building structure of a certain substation,and the full-scale test and finite element analysis(FEA)of the new foundation is carried out to study its bearing capacity under eccentric compression.The results of both the tests and FEA go as follows:the new-type modular prefabricated foundation exhibits excellent load-bearing capacity,deformation characteristics and good integrity,meeting the design requirements for substation foundation structure.During the loading process,the reinforcing bars at the wet joints of the base yield earlier,suggesting that the strength of the wet joints could be appropriately enhanced in practical engineering applications.The FEA results are generally consistent with the experimental findings,validating the accuracy of the theoretical analysis.When the thickness ratio of the base plate to the foundation is 1.1,the mechanical properties of the new-type prefabricated foundation are optimal.The crosssectional size of the shear key has a certain impact on the foundation's load-bearing capacity.Larger-sized shear keys can increase the initial stiffness of the foundation.However,if the size of the shear key is too large,the shear key slots corresponding to the base will become larger,reduce the effective thickness of the base,and accelerate the stiffness degradation of the foundation.Using UHPC(ultrahigh performance concrete)material as the filling material for wet joints can enhance the loadbearing performance of the foundation.
作者
殷建刚
熊川羽
周林涛
YIN Jiangang;XIONG Chuanyu;ZHOU Lintao(State Grid Hubei Electric Power Co.Ltd.,Wuhan Hubei 430048,China;State Grid Hubei Electric Economics and Technology Research Institute,Wuhan Hubei 430077,China;State Grid Xianning Power Supply Company Xianning,Xianning Hubei 437100,China)
出处
《湖北电力》
2025年第1期1-10,共10页
Hubei Electric Power
基金
国家电网有限公司总部管理科技项目(项目编号:5200-202222082A-1-1-ZN)。
关键词
变电站
装配式基础
静载试验
有限元分析
极限承载力
transformer substation
prefabricated foundation
static load testing
finite element analysis(FEA)
ultimate bearing capacity
