摘要
提出一种桥梁新型多功能支座,重点探讨此支座对桥上无缝线路纵向受力与变形的影响规律,以杭温铁路义乌特大桥为工点,对比研究桥梁采用固定墩设计方案及中墩更换为多功能支座后的桥上无缝线路力学特性,并在此基础上提出支座优化建议。研究得到以下结论:多功能支座方案可将桥梁的伸缩位移零点调整到桥梁主跨中点,从而减小桥梁温度跨度,解决义乌特大桥不适合做刚构桥的地形限值条件;当多功能支座摩擦系数小于0.005时,多功能支座方案相比传统支座方案的无缝线路受力优化幅度较小,摩擦系数大于0.005时,支座摩擦力可完全抵消列车制动力,无缝线路受力将得到大幅优化;随着摩擦系数的增加,钢轨伸缩力小幅增加,钢轨制动力较大幅度减小,摩擦系数为0.005时,制动力最小;建议多功能支座后续的优化方向为增大支座摩擦系数。
A new type of multifunctional bridge bearing is proposed.In order to discuss the influence of this bearing on the longitudinal stress and deformation of the CWR on the bridge,the design scheme of the fixed pier and the mechanical characteristics of the CWR on the bridge after the intermediate pier is replaced with multifunctional bearing are compared and studied with the Yiwu Super Major Bridge of Hangzhou-Wenzhou Railway as the construction site,and suggestions for bearing optimization are put forward on this basis.The following conclusions are drawn from the study:The multifunctional bearing scheme can adjust the zero point of the expansion displacement of the bridge to the midpoint of the main span of the bridge,thus reducing the temperature span of the bridge and solving the terrain limit condition that Yiwu Super Major Bridge is not suitable for rigid frame bridges;when the friction coefficient of the multifunctional bearing is less than 0.005,the stress optimization range of CWR in the multifunctional bearing scheme is smaller than that of the traditional bearing scheme.When the friction coefficient is greater than 0.005,the bearing friction can completely offset the train braking force,and the stress of the CWR will be greatly optimized;with the increase of friction coefficient,the rail expansion force increases slightly,and the rail braking force decreases greatly.When the friction coefficient is 0.005,the braking force is the smallest;regarding the subsequent optimization of the multifunctional bearing,it is suggested to increase the friction coefficient of the bearing.
作者
叶松
YE Song(China Railway SIYUAN Survey and Design Group Co.,Ltd.,Wuhan Hubei 430063,China;Hubei Key Laboratory of Railway Track Safety Service,Wuhan Hubei 430063,China)
出处
《中国铁路》
2023年第2期13-18,共6页
China Railway
基金
中国铁建股份有限公司科技研发重大项目(2021-A03)
中铁第四勘察设计院集团有限公司科研项目(2020C02)
第七届中国科协(第五届铁路)青年人才托举工程项目(2021QNRC001)。
