摘要
为满足某工程汽机基础振动控制要求和承载力需求,提出了安全可靠合理的改造方案。首先基于有限元分析方法,对改造前汽机基础进行自振分析,得到自振频率和振型等模态参数,与现场动力检测数据进行对比,验证了有限元计算模型的合理性;接着对改造方案汽机基础进行自振分析和谐响应分析,发现在0~62.5 Hz频率范围内,汽机基础各扰力关键点的振动线位移均符合振动位移控制标准;然后对改造方案汽机基础进行组合荷载静力分析,发现新梁截面轴向合力均为压力,有利于新老混凝土界面的连接,并采取布置预应力筋和锚杆的界面加固方法,以保证新老混凝土交界面接触稳定可靠;最后基于前述计算分析结果,进行了钢筋-混凝土锚固试件低周循环疲劳试验,试件和连接均未出现疲劳破坏,说明采用的钢筋和锚杆的界面加固方法在工作状态下合理可靠。研究结果对动力基础的设计和加固改造具有一定的参考意义。
For the renovation project of a turbine generator foundation and to get a safe reliable and reasonable reconstruction scheme,which meets the vibration control and bearing capacity requirements,this paper uses the finite element analysis method firstly,conducts a self-vibration analysis of the turbine foundation before renovation is carried out,and gets the modal parameters such as natural frequency and vibration mode,which are compared with the field dynamic test data to verify the rationality of the finite element model.Then the natural vibration analysis and harmonious response analysis are carried out on the turbine foundation of the reconstruction plan.It is concluded that the vibration displacement of each disturbance key points of the turbine foundation within the frequency range of 0~62.5 Hz conforms to the vibration displacement control standard.Through the combined load static analysis of the turbine foundation,it is concluded that the axial resultant force of the section of the new beam is negative,which is beneficial to the connection of the interface between new and old concrete,so as to ensure that the interface between new and old concrete is always in a stable and reliable state,the method of placing prestressed rebar and anchor bolt is adopted.Finally,based on the results of calculation and analysis above,the low-cycle fatigue test of reinforced concrete anchorage specimens is carried out.In the test,no fatigue failure occurs in the specimens and joints,indicating that the interface reinforcement method of prestressed rebar and anchor bolt adopted is reasonable and reliable in the working state.Through the finite element analysis and experimental investigation of the reconstructed turbine foundation in this paper,a reasonable and reliable reconstruction scheme is obtained,which applies to the engineering example of a turbine generator foundation reconstruction project,which has a guiding significance for the design and reconstruction technology of turbine generator foundation research.
作者
廖杰洪
周志勇
李明
胡俊杰
陈明祥
LIAO Jiehong;ZHOU Zhiyong;LI Ming;HU Junjie;CHEN Mingxiang(Research Institute of Wuda Jucheng Structure Co.,Ltd.,Wuhan 430223,China;Hubei Electric Power Survey and Design Inst.Co.,Ltd.,Wuhan 430040,China;School of Civil Engineering and Architectural,Wuhan University,Wuhan 430072,China;Engineering Research Center of Ministry of Education for Building Detection and Reinforcement,Wuhan University,Wuhan 430072,China)
出处
《武汉大学学报（工学版）》
CAS
CSCD
北大核心
2021年第S02期14-20,共7页
Engineering Journal of Wuhan University
关键词
汽机基础
振动控制
承载力
振动线位移
turbine foundation
vibration control
the bearing capacity
vibration displacement
作者简介
廖杰洪(1987-),男,工学博士,高级工程师,主要从事建筑结构加固改造研究,E-mail:liaojie342@qq.com.
