梁高变化线形对公路连续梁桥静动力特性的影响分析
首发时间:2019-08-27
摘要:基于变截面梁单元刚度矩阵的具体表达式,理论分析梁高对变截面单元刚度的影响规律。在此基础上,采用ANSYS建立公路变截面连续梁模型,分析梁高变化线形对变截面连续梁桥静动力特性的影响。分析结果表明,随着梁高变化系数的增加,单元刚度值逐步增大,但增幅较小;在静力均布荷载作用下,随着抛物线线形阶次的增大,桥梁的位移峰值逐渐增大,连续梁梁高变化线形对桥梁刚度分布影响较为明显;随着梁高变化线形阶次的增大,桥梁竖向振动频率减小,横向振动频率增大,桥梁的一阶竖向振动频率下降幅度更为明显;在动力荷载作用下,随着梁高变化线形阶次的增大,桥梁跨中位移和加速度峰值都呈增大趋势,梁高变化线形对桥梁的动力响应影响较大。
关键词: 桥梁工程 公路连续梁桥 梁高变化线形 静力分析 自振特性分析 动力特性
For information in English, please click here
Analysis of the influence of alignment of beam height variation static and dynamic characteristics of highway continuous beam bridge
Abstract:In this paper,based on the concrete expression of the stiffness matrix of variable cross-section beam element, the influence of beam height on the stiffness of variable cross-section beam element is theoretically analyzed. On this basis, ANSYS is used to establish the highway continuous beam model with variable section, and the influence of the change line of beam height on static and dynamic characteristics of variable cross-section continuous beam bridge is analyzed. The results show that the stiffness of the element increases gradually with the increase of the variation coefficient of the beam height, but the increase is smaller. Under static uniform load, the displacement peaks of the bridge increase gradually with the increase of parabolic order. The influence of continuous beam height variation on bridge stiffness distribution is more obvious. With the increase of the linear order of the beam height change, the vertical vibration frequency of the bridge decreases and the transverse vibration frequency increases. And the first-order vertical vibration frequency of bridge decreases more obviously. Under the dynamic load, the displacement and acceleration peaks of bridge span increase with the increase of linear order of beam height change. And the dynamic response of bridge is greatly affected by the change of beam height alignment.
Keywords: bridge engineering highway continuous girder bridge alignment of beam height variation static analysis analysis of self-vibration characteristics dynamic characteristics
引用
No.****
动态公开评议
共计0人参与
勘误表
梁高变化线形对公路连续梁桥静动力特性的影响分析
评论
全部评论0/1000