铁路钢-混结合梁下平联布置形式研究  

A Study on Bottom Laterals Arrangement of Railway Steel-concrete Composite Girder

作　　者：魏程峰 艾宗良[1] 戴胜勇[1] 钟亚伟[1] 徐硕 WEI Chengfeng;AI Zongliang;DAI Shengyong;ZHONG Yawei;XU Shuo(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《高速铁路技术》2023年第1期59-62,共4页High Speed Railway Technology

摘　　要：为提高高速铁路钢-混结合梁的抗扭转性能,采用数值模拟对下平联布置形式进行了研究,建立了双工字形、三工字形和双槽形3种截面形式钢-混结合梁的有限元模型,分析了单线列车偏载作用下梁体扭转引起的轨面不平顺值及两片主梁的位移比,结果表明:(1)双槽形钢-混结合梁抗扭性能较好,不需设置下平联即可满足高速铁路行车要求;(2)工字形钢-混结合梁设置下平联后,抗扭性能得到显著改善;(3)建议200 km/h及以下速度铁路工字型截面钢-混结合梁下平联选择桁式结构的形式,200 km/h以上速度铁路选择混凝土底板的形式。In order to improve the torsional resistance of steel-concrete composite girders for high-speed railways,the layout of the bottom laterals was studied by numerical simulation,and the finite element models of steel-concrete composite girders with double-I-shaped,triple-I-shaped and double-groove sections were established,and the rail surface irregularity caused by girder torsion under the eccentric load of a single-track train and the displacement ratio of two main girders were analyzed.The results show that:(1)The double-channel steel-concrete composite girder has good torsional performance and can meet the train operation requirements of high-speed railways without setting the bottom laterals.(2)After the I-shaped steel-concrete composite girder is set with the bottom laterals,the torsional performance is significantly improved.(3)It is recommended to select the truss structure for the bottom laterals of the steel-concrete composite girder of I-shaped section for the railway with a speed of 200 km/h and below,and select the concrete floor for railways with a speed of above 200 km/h.

关 键 词：铁路钢-混结合梁 抗扭性能 轨面不平顺 桁式平联 

分 类 号：U448.36[建筑科学—桥梁与隧道工程]