气液联动执行器抗震应力分析

利用有限元仿真软件ANSYS Workbench对气液联动执行器进行预应力模态分析,同时计算执行器在系统运行工况下的应力和变形,并根据ASME BPVC-VIII DIV.2 PART 5规范进行应力评定。结果证明,气液联动执行器在设计载荷和地震载荷共同作用下能够保持结构完整性和可运行性,满足技术要求,在实际工程应用中可以良好运行。

反应谱理论及其在电阻架抗震分析中的应用

以高压绝缘电阻架为研究对象,基于振型分解反应谱理论,建立了三维梁壳单元有限元分析模型。结合电阻架的动力特性和地震响应谱,并计入结构阻尼对地震反应的影响,进行了电阻架的模态分析和反应谱分析,得到了电阻架在双向水平与扭转地震偶联作用下的位移、速度、加速度响应以及应力。分析结果表明,电阻架位移和速度的最大响应点在最顶层电阻器上,加速度最大的位置在铜管。地震响应的应力评定满足结构强度要求,该方法为电阻架的抗震设计提供了参考及依据。

Study on Improvement of Seismic Performance of Transmission Tower Using Viscous Damper

The earthquake resistance of transmission tower has been often discussed from the viewpoint of reinforcing the foundation of steel tower, but there are also few studies considering the damping characteristics of the tower. This paper focuses on the viscous damper which has been adopted for seismic reinforcement of bridges in recent years. The purpose of this study is to improve the seismic performance of steel tower by giving the high damping to the tower. We construct a single tower model considering the influence of transmission line, and then simulate the vibration characteristics and seismic behavior of the tower by the eigenvalue analysis and the dynamic response analysis. The results show that the transmission tower with viscous damper can reduce its own response effectively and drastically. This research concludes that it is necessary to consider the extreme increase of steel tower＇s response depending on the seismic wave and the collapse of steel tower can be avoided by using the optimum damper in the design of the transmission tower.