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

发布时间：2018-08-03 15:52

【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。
[Abstract]:Taking Shuohuang railway as engineering background, the fatigue crack resistance of prestressed concrete simply supported T beams with normal height of 32 m in Shuohuang Railway is analyzed from the point of view of fatigue crack resistance under the condition of 250 KN ~ 280 KN ~ (300) KN ~ (30) KN ~ (30) KN ~ (3 +) ~ (350) KN ~ + 400 KN. Through the fatigue stress analysis of normal section, it can be seen that when the axial load is 1250kN, the beam can only be depressurized and cracked about 2280kN for about 18 million times when the number of cycles is about 5 million times. When the number of cycles is about 1.5 million times, there will be pressure relief. When the axial load of 3300kN is cracked about 8 million times, the beam has already begun to depress at about 510000 cycles, and when the axial load is about 4330kN for 4.5 million times of cracking, When the beam has been depressurized for about 30 000 cycles, when the axle load is cracked about 5 350 KN for 1.5 million times, the beam begins to depress when the cycle number is about 1000, and the axial load is about 6 400 KN for 590000 times. The beam has been cracked about 100 times. Therefore, it is more suitable to increase the axle load from 23t to 300kN for heavy haul transportation of the existing Shuohuang railway.
【作者单位】：中铁第四勘察设计院集团有限公司;中南大学土木工程学院;
【基金】：国家863高技术研究发展计划(2009AA11Z101) 国家自然科学基金(51278496)
【分类号】：U441.4;U239.4

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