摘要
TB 10002—2017《铁路桥涵设计规范》规定墩台承受的制动附加力为竖向荷载的10%,不能很好地反映列车制动时墩台受力规律。建立重载铁路简支梁线桥模型,研究典型工况下墩台受力变化规律,并对主要影响因素进行分析。研究结果表明:满跨加载状态下,桥梁墩台整体承受约90%的轨面制动力,单墩最大制动附加力与对应单跨轨面制动力基本相等;单线加载单线受力对墩台受力更为不利,双线受力使约10%的轨面制动力沿另一线钢轨传入两侧路基;相邻墩顶线刚度差比值不超过10%时,桥墩承受的制动附加力基本不受影响;线路纵向阻力在一定范围内对墩台受力特征基本无影响。
TB 10002—2017《Code for Design on Railway Bridge and Culvert》stipulates that the additional braking force on the pier and abutment is 10%of the vertical load,which cannot reflect the force law of the pier and abutment during train braking.The model of simple supported beam track bridge for heavy haul railway was established to study the force variation law of pier and abutment under typical working conditions,and the main influencing factors were analyzed.The results show that under the full span loading state,the bridge piers and abutments bear about 90%of the rail surface braking force,and the maximum additional braking force of single pier is basically equal to the corresponding single span rail surface braking force.The single track loading and single track force is more unfavorable to the pier and abutment force.The double track force makes about 10%of the rail surface braking force transmitted into the subgrade on both sides along the other line of rail.When the stiffness difference ratio of adjacent pier top line is less than 10%,the additional braking force of pier is not affected.In a certain range,the longitudinal resistance of the track has no effect on the mechanical characteristics of the pier and abutment.
作者
陈浩瑞
班新林
CHEN Haorui;BAN Xinlin(Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)
出处
《铁道建筑》
北大核心
2020年第10期13-16,共4页
Railway Engineering
基金
中国国家铁路集团有限公司科技研究开发计划(J2019G001)
中国铁道科学研究院基金(2018YJ030)
朔黄铁路发展有限公司技术开发项目(SHGF-12-24)。
关键词
铁路桥梁
制动附加力
理论分析
桥梁墩台
有效制动力率
纵向阻力
railway bridge
additional braking force
theoretical analysis
bridge pier and abutment
effective braking force rate
longitudinal resistance
作者简介
第一作者:陈浩瑞(1995-),男,研究实习员,硕士。E-mail:chenhaorui0115@sina.com。
