布置压杆的弧形钢闸门静动力特性分析

ANALYSIS OF STATIC AND DYNAMIC CHARACTERISTICS OF RADIAL STEEL GATE WITH COMPRESSION BARS

采用通用有限元软件ANSYS建立了布置压杆的弧形钢闸门有限元模型,对压杆布置闸门模型和传统闸门模型进行了静动力特性对比研究,验证了压杆布置的有效性。根据闸门运行特点,于支臂分叉点和纵梁下翼缘处均匀布置压杆,通过有限元模型分析了压杆布置对弧形闸门的静动力特性的影响,对两种型式下的闸门分别进行了静力分析、模态分析和谐响应分析。结果表明:所提出的压杆布置闸门在静水荷载作用下的应力和位移有大幅度降低,在用钢量增加极小的情况下闸门整体极限承载能力得到大幅度提升;闸门在无水关闭情况下的自振频率随着压杆的布置而增大;压杆布置闸门的幅值响应频率增大,各关键节点响应幅值降低,达到了提升结构整体稳定和抗振性能的目的。

The finite element software ANSYS was used to establish the finite element model for the radial steel gate with compression bars.The static and dynamic characteristics of the gate with compression bars were compared with the traditional gate,and the effectiveness of the arrangement of compression bars was verified.According to the operation characteristics of the gate,compression bars were evenly arranged at the branch point of the arm and the lower flange of the longitudinal beam.The influence of the compression bar arrangement on the static and dynamic characteristics of the radial gate was analyzed by the finite element model.The static analysis,modal analysis and harmonic response analysis were carried out for the two types of gates.The results indicate that:the stress and displacement of the proposed gate with compression bars are greatly reduced under the hydrostatic load,and the overall ultimate bearing capacity of the gate is greatly increased with the minimum increase of steel consumption;in the case of no water closure,the natural frequency of the gate increases with the arrangement of the pressure bar;the amplitude response frequency of the pressure bar arrangement gate increases,and the response amplitude of each key node decreases,which achieves the purpose of improving the overall stability and anti-vibration performance of the structure.