服役预制板结构动力特性测试及分析

Testing and and analysis of dynamic characteristics of precast slab structure in service

结构动力特性是结构本身的一种固有属性,通过测试结构的动力特性来判断结构性能或识别结构损伤是一个有效的途径。本文通过试验实测了服役房屋结构某预制板的固有频率及振型等结构动力特性,并通过ANSYS软件对该预制板进行了有限元模态分析。测试与分析结果显示,预制板前三阶振型所对应的振动频率实测值与理论分析值非常接近,表明了该结构在服役了多年后其性能状态仍是基本完好的。

The structural dynamic characteristics are a kind of inherent quality of the structure itself,and it is an effective method to determine the structural performance or the structural damage by testing the structural dynamic characteristics. In this paper,the structural dynamic characteristics such as natural frequency and vibration mode of a precast slab from an existing structure were tested throush an experiment,and the finite element mode analysis was made for the precast slab by using ANSYS software. The test and analysis results show that,the measured frequency of the first three modes of vibration are all very close to the theory values,and they also indicate that the structure is still basically good in performance state after serving for many years.