基于有限元法分析T梁跨度对基频的影响

针对梁桥结构设计参数对桥梁基频的影响展开研究。常见的影响因数包括桥梁主跨跨径、跨数、边中跨比、高跨比、宽跨比等。实验研究表明,主跨跨径、跨数、边中跨比对连续梁桥基频影响较大。采用控制参数法,通过控制同跨数、同边中跨比来建立不同跨度的T梁桥的有限元模型并进行分析,提取其基频值,可为各种常见跨度的简支、连续T梁提供拟合公式,并用实例进行了验证。验证结果显示,拟合出的经验公式计算所得基频与有限元模型计算基频吻合得很好,说明该研究方法具有可行性及有效性,从而为研究跨度对基频的影响寻求了实用的简化计算式。

Effect of T-beam Span on Basic Frequency by Finite Element Method

The influence of the bridge structure design parameters on the fundamental frequency of bridge was studied, the common impact factors include the main span, the span number, the main span and side span ratio, depth-span ratio, wide span ratio, etc.The experimental studies has shown that the main span, the span number, themain span and side span ratio have great influence on the fundamental frequency of continuous girder bridges. The finite element models of T girder bridge in different span can established by using controlling the same span number, same span ratios and can be analyzed by it. The fitting formula of various common span continuous T beam will leads by extracting the fundamental frequency value and was validated by an example. The validation results show that the calculated fundamental frequency by fitting formula agreement with the finite element model very well and verify the research method of this paper is feasibility and validity, it provided the practical simplified calculation formula to study the effect of span on the fundamental frequency.