Load limit determination of steel bridge decks based on fatigue reliability

被引：0

作者：

Zhai M.-S. ^{[1
]}

Qian J.-C. ^{[1
]}

Chu L. ^{[1
]}

Tao Y.-R. ^{[1
]}

机构：

[1] School of Civil Engineering, Suzhou University of Science and Technology, Jiangsu, Suzhou

来源：

Jiaotong Yunshu Gongcheng Xuebao/Journal of Traffic and Transportation Engineering | 2024年 / 24卷 / 01期

关键词：

bridge engineering; cumulative fatigue damage theory; fatigue reliability; load limit; steel bridge deck; weigh-in-motion;

D O I：

10.19818/j.cnki.1671-1637.2024.01.016

中图分类号：

学科分类号：

摘要：

To determine the reasonable load limit of steel bridge decks, the multi-scale finite element models were built for steel bridge decks. With the weigh-in-motion (WIM) and Monte Carlo method, the stochastic traffic flows were generated and the finite element model was dynamically loaded. Stochastic fatigue stress spectra were acquired by rain flow counting method. According to reliability theory and cumulative fatigue damage theory, the fatigue reliabilities of typical details were calculated, and then the fatigue reliability-based load limit method was proposed for steel bridge decks. Taking the steel bridge deck of a sea-crossing cable-stayed bridge as an example, the fatigue reliabilities of typical details were assessed respectively based on the WIM data in 12 consecutive months. Considering the linear annual growth coefficients of traffic volume and load level, load limit values were determined for steel bridge decks under different traffic conditions. Research results show that the fatigue reliability indices of steel bridge decks are higher than the target fatigue reliability indices under current traffic conditions. Traffic volume and load level have great influence on the fatigue reliability of steel bridge decks. Considering that the linear annual growth coefficient of the traffic volume is 2. 0% or the linear annual growth coefficient of the load level is 0. 4%, the fatigue reliability indices of some details are lower than the target fatigue reliability indices during the design service life. Considering that the linear annual growth coefficient of traffic volume is 3. 0% and the linear annual growth coefficient of load level is 0. 6%, the fatigue reliability indices arc lower than the target fatigue reliability indices under the current load limit of 49. 0 t. When the load limit is 36. 5 t, the fatigue reliabilities can meet the fatigue safety requirements. At the current load level, the maximum average daily truck traffic of the single lane is 3 820 veh. When the traffic volume increases significantly during the operation, the fatigue damage detection should be strengthened for the steel bridge decks, and traffic diversion or bridge load limit measures should be taken if it is necessary. 14 figs, 31 refs. © 2024 Chang'an University. All rights reserved.

引用

页码：245 / 256

页数：11

共 31 条

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