温度效应下曲线梁爬移的机理分析

为了明确曲线梁爬移的力学机理,进一步确定温度效应下曲线梁的爬移,利用ANSYS有限元软件建立某曲线梁的实体模型,采用稳态热分析确定各节点的温度即温度场,在此基础上采用一次荷载代替长期反复荷载、主梁横桥向位移代替爬移变形的方法分析温度效应下曲线梁爬移；然后为了进一步说明曲线梁桥的爬移机理,并探讨摩阻力使橡胶支座产生残余变形进而使曲线梁出现横向爬移的过程,利用Combine39单元模拟桥梁爬移时支座变形的累计效应,近似分析温度效应下曲线梁爬移的力学机理。研究表明：温度效应是曲线梁爬移的重要外部荷载原因,灰尘和垃圾堵塞支座空隙、支座材料老化和支座摩阻力是引起曲线梁桥爬移的主要内在因素,通过Combine39单元模拟橡胶支座的摩阻力-残余变形可以近似分析曲线梁爬移的变形累积过程,该方法能定量解释曲线梁桥横向爬移的机理。

Analysis of the Mechanism of Curved Beam Lateral Deformation under Temperature Effect

To understand the mechanism of the curved beam lateral displacement, further to determine the curved beam lateral displacement under temperature effect, using ANSYS finite element software to establish solid element model of a curved beam, steady state thermal analysis method is applied to analyze temperature field. Based on the analysis, using the primary load instead of the long-term repeated load, transverse displacement of main girder instead of lateral deformation, the curved beam lateral deformation under temperature effect is analyzed. Then in order to further explain the lateral deformation mechanism of curved beam, to discuss the frictional force causing the residual deformation of the rubber bearing to make the lateral deformation of the curved beam, using Combine39 element to simulate cumulative effect of the bearing lateral deformation, the mechanical mechanism of curved beam under temperature effect is approximately analyzed. It is indicated that temperature effect is an important external load factor of curved beam lateral deformation. The main factors that cause the displacement of curved beam are dust and garbage to clog the gap of bearing, the aging of bearing material and the friction of bearing. The method of using Combine39 element to approximately simulate cumulative effect of the bearing lateral deformation is feasible and this method can be used to explain the mechanism of lateral deformation of curved beam.