铁道标准设计
鐵道標準設計
철도표준설계
RAILWAY STANDARD DESIGN
2014年
10期
56-61
,共6页
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
朔黃鐵路%重載運輸%軸重%預應力混凝土簡支T樑%疲勞抗裂性能
삭황철로%중재운수%축중%예응력혼응토간지T량%피로항렬성능
Shuo-Huang railway%Heavy-haul transport%Axle load%PC simply supported T-type beam%Fatigue crack resistance
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,1800万次左右开裂；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。
以朔黃鐵路為工程揹景,從疲勞抗裂的角度對列車軸重250 kN、280 kN、300 kN、330 kN、350 kN、400 kN 情況下,對朔黃鐵路32 m 正常高度預應力混凝土簡支 T 樑的疲勞抗裂性進行分析。通過正截麵疲勞應力分析可知：①250 kN 軸重時,樑體在循環次數達500萬次左右纔會齣現消壓,1800萬次左右開裂；②280 kN 軸重時,樑體在循環次數達150萬次左右就會齣現消壓,800萬次左右開裂；③300 kN 軸重時,樑體在循環次數達51萬次左右已開始消壓,450萬次左右開裂；④330 kN 軸重時,樑體在循環次數達3萬次左右已開始消壓,150萬次左右開裂；⑤350 kN軸重時,樑體在循環次數達1000次左右就開始消壓,59萬次左右開裂；⑥400 kN 軸重時,樑體在循環次數達100次左右已齣現開裂。因此,既有朔黃鐵路重載運輸的列車軸重從23t 提高到300 kN 是較為適宜的。
이삭황철로위공정배경,종피로항렬적각도대열차축중250 kN、280 kN、300 kN、330 kN、350 kN、400 kN 정황하,대삭황철로32 m 정상고도예응력혼응토간지 T 량적피로항렬성진행분석。통과정절면피로응력분석가지：①250 kN 축중시,량체재순배차수체500만차좌우재회출현소압,1800만차좌우개렬；②280 kN 축중시,량체재순배차수체150만차좌우취회출현소압,800만차좌우개렬；③300 kN 축중시,량체재순배차수체51만차좌우이개시소압,450만차좌우개렬；④330 kN 축중시,량체재순배차수체3만차좌우이개시소압,150만차좌우개렬；⑤350 kN축중시,량체재순배차수체1000차좌우취개시소압,59만차좌우개렬；⑥400 kN 축중시,량체재순배차수체100차좌우이출현개렬。인차,기유삭황철로중재운수적열차축중종23t 제고도300 kN 시교위괄의적。
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.
