无缝线路上铁路桥梁墩台制动力的计算方法

研究目的:制动力是影响桥梁墩台设计的重要因素之一,现针对无缝线路上铁路桥梁制动力的传力特点, 研究在中-活载作用下无缝线路上简支梁桥墩、台顶制动力的分配规律,提出更接近于实际的制动力计算方法、 研究方法:针对无缝线路上铁路桥梁的传力特点,采用将桥梁结构、台后部分路基以及上面的轨道结构作 为一个整体系统共同承受列车制动力的整体计算模型(即线-桥系统),运用有限元程序进行分析、计算。 研究结果:在对等跨度、桥墩等刚度的铁路多跨简支梁桥的墩、台顶制动力进行大量计算的基础上,找出了 影响多跨简支梁桥墩、台顶制动力分配的因素及其变化规律,提出了制动力的实用计算公式。 研究结论:通过对无缝线路上铁路桥梁的墩台顶制动力分配的影响因素分析,提出了铁路桥梁墩台顶制动 力的实用计算方法,经过分析该制动力实用计算方法,使用方便,操作简单,使制动力的计算更接近于实际。

THE APPLICABLE CALCULATION METHOD OF PIERS' AND ABUTMENTS' BRAKING FORCE OF RAILWAY BRIDGE ON JOINTLESS TRACK

Research purpose:Braking force is one of important influence factors in designing piers and abuments of bridge. Now according to the characteristics of transmiting braking force of railway bridge on jointless track, the law of piers' and abutments' braking force of the simply-supported bridges on jointless track loaded by Standard Railway Train Live Load Specidied by The People's Republic of China is analysed, and applicable calculation method of braking force is put forward. Research method: According to the characteristics of transmiting braking force of railway bridge on jointless track, bridge constructure, jointless track on bridge, part of subgrade on back of abutment are considered as integral calculating model, to calculate braking force of track. Based on this model,finite element method is adopted to analyse and calculate. Research result: The influence factors and the law of piers' and abutments' braking force of the simply - supported bridges loaded by Standard Railway Train Live Load Specidied by The People's Republic of China are analysed, piers' and abutments' braking force considering equal span and equal piers'stiffness on the simply-supported bridges is calculated. Finally, applicable calculation method of braking force considering equal span and equal piers' stiffness on the simply-supported bridges is put forward. Research conclusion: This method is simple, applicable and also approach the calculated data.