大轴重列车对既有线32m预应力混凝土简支T梁的疲劳影响研究  

Study on the Effect of Fatigue in 32 m-span PC Simply Supported T-type Beams on Existing Line Due to Heavy-haul Transport

作　　者：李进洲[1,2] 余志武[2] 

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063 [2]中南大学土木工程学院,长沙410075

出　　处：《铁道标准设计》2014年第10期56-61,共6页Railway Standard Design

基　　金：国家863高技术研究发展计划(2009AA11Z101);国家自然科学基金(51278496)

摘　　要：以朔黄铁路为工程背景,从疲劳抗裂的角度对列车轴重250 kN、280 kN、300 kN、330 kN、350 kN、400 kN情况下,对朔黄铁路32 m正常高度预应力混凝土简支T梁的疲劳抗裂性进行分析。通过正截面疲劳应力分析可知:1250 kN轴重时,梁体在循环次数达500万次左右才会出现消压,1 800万次左右开裂;2280 kN轴重时,梁体在循环次数达150万次左右就会出现消压,800万次左右开裂;3300 kN轴重时,梁体在循环次数达51万次左右已开始消压,450万次左右开裂;4330 kN轴重时,梁体在循环次数达3万次左右已开始消压,150万次左右开裂;5350 kN轴重时,梁体在循环次数达1000次左右就开始消压,59万次左右开裂;6400 kN轴重时,梁体在循环次数达100次左右已出现开裂。因此,既有朔黄铁路重载运输的列车轴重从23t提高到300 kN是较为适宜的。Based on Shuo-Huang railway engineering, an analysis of fatigue crack resistance is conducted on 32 m-span PC normal-height simply supported T-type beam under 250 kN, 280 kN, 300 kN, 330 kN, 350 kN, 400 kN axle load. The analysis of fatigue stress of right section shows that ①under 250 kN axle 〈br〉 loads, the bottom flange of the beam can be of decompression with about 5. 00 million cycles and cracked about 18. 00 million; ②under 280 kN axle loads, the bottom flange of the beam can be of decompression with about 1. 5 million cycles and cracked about 8. 00 million; ③under 300 kN axle loads, the bottom flange of the beam can be of decompression with about 4. 50 million cycles and cracked about 0. 51 million; ④ under 33t axle loads, the bottom flange of the beam can be of decompression with about 0. 03 million cycles and cracked about 1. 50 million; ⑤ under 35t axle loads, the bottom flange of the beam can be of decompression with about 1000 cycles and cracked about 0. 59 million; ⑥under 400 kN axle loads, the bottom flange of the beam can be cracked with about 100 cycles. Therefore, it is appropriate that the axle-load of heavy-haul transport on the existing Shuo-Huang railway line is increased from current 230 kN to 300 kN.

关 键 词：朔黄铁路 重载运输 轴重 预应力混凝土简支T梁 疲劳抗裂性能 

分 类 号：U441.2[建筑科学—桥梁与隧道工程] U441.4[交通运输工程—道路与铁道工程]