钢楼梯在人致激励下的振动舒适度控制研究

Research on Vibration Comfort Control of Steel Stairs under Human Excitation

钢楼梯在人行激励作用下,会产生竖向振动。过大的振动不仅会引起舒适度问题,还可能引发结构的安全问题。文章以某钢结构旋转楼梯作为研究对象,采用Midas Gen软件对该楼梯进行了人行激励下的结构动力特性分析,对比分析了安装TMD前后结构的加速度响应,结果表明TMD系统减振效果显著。同时根据TMD原理,对TMD频率比和阻尼比参数所起到的减振效果进行分析比较,可为类似工程提供参考。

Steel stairs generate vertical vibrations under the excitation of pedestrians.Excessive vibration can cause not only comfort problems,but also structural safety issues.In this paper,a steel structure spiral staircase is taken as the research object.The structural dynamic characteristics of the staircase under the pedestrian excitation are analyzed by Midas Gen software.The acceleration response of the structure before and after the installation of TMD is compared and analyzed.The results show that the TMD system has significant vibration reduction effect.At the same time,according to the TMD principle,the vibration damping effect of the TMD frequency ratio and the damping ratio parameter is analyzed and compared,which can provide reference for similar projects.