周期结构梁弯曲振动特性研究

Study on Flexural Vibration Characteristics of Periodic Structure Beams

为研究周期结构梁的弯曲振动特性,本文建立计算模型并推导了周期梁的自振频率计算方法,计算周期梁上附加构件参数变化对自振频率的影响。计算结果显示,改变周期梁附加构件的几何参数,梁的自振特性也发生明显变化:附加构件长度增加,周期梁的自振频率随之增大;随着构件高度增加,自振频率先增大后减小;保持单个附加构件长度不变,自振频率随附加构件的数量增加而增大。结果表明:在混凝土梁上附加钢板形成周期结构梁,可有效改变梁的振动特性,并可通过改变构件参数调整周期梁的自振频率,实现对既有建筑结构中梁构件的靶向加固。

In order to study the flexural vibration characteristics of periodic structure beams,a calculation model was established and the calculation method of natural frequency of periodic beams was derived.The calculation results show that the natural vibration characteristics of the beam also change significantly when the geometric parameters of the additional members of the periodic beam are changed.The natural vibration frequency of the periodic beam increases with the increase of the length of the additional component.With the increase of component height,the natural frequency first increases and then decreases.Keep the length of the additional components unchanged,and the natural frequency increases with the number of additional components.The results show that adding steel plates to concrete beams to form periodic structure beams can effectively change the vibration characteristics of beams,and can adjust the natural frequency of periodic beams through changing component parameters to achieve targeted reinforcement of beams in the existing building structures.