Research and application of fatigue load spectrum of port highway bridge(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2018年04期
- Page:
- 48-55
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Research and application of fatigue load spectrum of port highway bridge
- Author(s):
- DI Jin; WANG Jie; PENG Xi; QIN Fengjiang; DAI Jie
- (1. Key Laboratory of New Technology for Construction of Cities in Mountain Area of Ministry of Education,Chongqing University, Chongqing 400045, China； 2． School of Civil Engineering， Chongqing University，Chongqing 400045, China； 3． School of Highway， Changan University， Xian 710064, Shaanxi， China)
- Keywords:
- road engineering; port highway bridge; fatigue load spectrum; orthotropic steel deck; vehicle load; fatigue life
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to study the fatigue load spectrum of port highway bridge, a highway bridge in the port in Zhejiang coast was used as a background to continuously track its load information of vehicles within 1 year to study the fatigue load spectrum of port highway bridge. First, the vehicles of the port highway bridge were divided into 7 categories based on the number of axle and wheelbase, and the distribution characteristics on the vehicle load of port highway bridge were analyzed from traffic volumes, the quality of axle load and wheelbase. Then, according to the principle of equivalent fatigue damage, the quality of equivalent axle load and the equivalent wheelbase of every type of vehicles were calculated to obtain the fatigue load spectrum of port highway bridge. Finally, based on this fatigue load spectrum, the fatigue life of three key fatigue details of this bridges orthotropic steel deck was evaluated by hot spot stress method. The results show that the traffic volume of the slow lanes on both sides accounts for 79.5% of the total, weight vehicles with four or more axles (V4 to V7) accounts for 81.5% of the total traffic volume and the dominating types are V4, V5, V7. The axle loads of the 4axle truck obey mixed Gauss distribution, and the wheelbase obey Gauss distribution, in the fatigue load spectrum of port highway bridge, the weight of all equivalent fatigue vehicles is bigger than 10 t, and four or more axles trucks account for 85.9%. The contribution rate of fatigue damage of four or more axle trucks to the steel deck is more than 90%, of which the ratio of the 5axle truck and the second type of 6axle truck accounts for 70% of the total traffic volume, while the ratio of second type of 3axle vehicle is the lowest, accounting for less than 1%. The fatigue life of this bridges three key fatigue details is evaluated to be less than the designed service life, and the fatigue life of P2 and P3 is only 4.4 years and 6.1 years, so its necessary to strengthen the monitoring to ensure the safety of bridge structure. The fatigue load spectrum obtained in this paper is of great reference value for the fatigue design and fatigue damage assessment of the port highway bridge in the future, and the results of fatigue life evaluation provide guidance for the later maintenance of this bridge. 4 tabs, 9 figs, 26 refs.
Last Update: 2018-08-03