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| Fatigue reliability evaluation of railway steel truss bridge based on measured load |
| Received:March 28, 2019 Revised:May 21, 2019 |
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| DOI：10.7511/jslx20190328002 |
| KeyWord:railway steel bridge random vehicle load fatigue reliability assessment β-boundary method system fatigue reliability |
| Author | Institution |
| 肖鑫 |
中国铁道科学研究院集团有限公司铁道建筑研究所, 北京 ;高速铁路轨道技术国家重点实验室, 北京 |
| 赵欣欣 |
中国铁道科学研究院集团有限公司铁道建筑研究所, 北京 ;高速铁路轨道技术国家重点实验室, 北京 |
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| Abstract: |
| In order to evaluate the fatigue of a steel truss bridge,a reliability theory is introduced,and a fatigue reliability assessment method based on measured load data is proposed.According to the measured load data of a railway steel truss bridge,a random vehicle load model is established.On the basis of the randomness of vehicle loads,the fatigue stress spectrum of members of the steel truss bridge is analyzed by combining Monte-Carlo method with the finite element method,the variation of fatigue reliability with time is calculated,and the influence of variability of vehicle loads and load effects on the fatigue reliability of members is discussed.Finally,the fatigue reliability of the steel truss bridge system is studied by the β-bound method and static analysis method.The results show that the fatigue stress spectrum of the members based on the random vehicle load shows a single peak distribution.The increase of the vehicle load and variability of load effect have the great influence on fatigue reliability of components,when the growth rate of the vehicle load and the variation coefficient of the equivalent stress increase to 5%,the fatigue life of the component is greatly reduced.The β-boundary method combined with the static analysis method can quickly determine the failure mode of the steel truss bridge,and the fatigue life of the system is less than the fatigue life of the members.In general,the steel truss bridge fatigue reliability assessment method based on the measured load can effectively use the monitoring data and has good applicability. |
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