Influence of Bridge Approach, Surface Condition, and Velocity on Impact Factors for Fatigue-Prone Details

Clarke, Shima; Deatherage, J H; Goodpasture, David W; Burdette, Edwin G.

doi:10.3141/1624-20

Cited by 2 publications

(3 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The dynamic amplification factor is the ratio of the bridge's maximum dynamic response ( max Y ) to the maximum static response ( st Y ) under the same vehicle load. The difference between the DLA (u) and the dynamic amplification factor ( DAF ) is 1, as shown in Equation (2). The diagram of this method is shown in Figure 2, and the related DLA is named theoretical DLA.…”

Section: Theoretical Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Assessing Dynamic Load Allowance of the Negative Bending Moment in Continuous Girder Bridges by Weighted Average Method

Wang

Tian²,

Zhou

et al. 2022

Coatings

View full text Add to dashboard Cite

Accurate acquisition of dynamic load allowance (DLA) based on measurement data is essential to the safety assessment of a bridge. When static load tests cannot be achieved, and filtering fails, the estimated DLAs from the experimental method vary widely due to the choice of a left or right band. In this paper, the proposed weighted average method (WAM) is used to possibly solve the above problem in continuous gird bridges. Two-span and three-span precast concrete box-gird bridges were selected to optimize intercepted segments of WAM for the first time with the assistance of standard deviation and coefficient of variation in statistics. Then, a DLA measurement case of the negative bending moment was utilized to verify the validity of the WAM. The results show that the intercepted segments of 10L/16 to L were suitable for the WAM to calculate the DLA of the negative bending moment due to small offset moments and stable variation coefficients. The WAM had a strong anti-interference ability of outliers filtering in “bad data,” which differed significantly from the experimental method. In three measurements of a field bridge, DLAs obtained by the WAM had less dispersion than the experimental and low-pass filtering methods.

show abstract

Section: Theoretical Methodsmentioning

confidence: 99%

“…The dynamic effect of moving vehicles on bridges is generally treated as a dynamic load allowance (or dynamic impact factor), which is one of the important evaluation indicators of bridge health. Failure to properly account for dynamic effect can underestimate the stress cycles contributing to bridge component fatigue [1,2].…”

Section: Introductionmentioning

confidence: 99%

Assessing Dynamic Load Allowance of the Negative Bending Moment in Continuous Girder Bridges by Weighted Average Method

Wang

Tian²,

Zhou

et al. 2022

Coatings

View full text Add to dashboard Cite

show abstract

“…The data were acquired by using Optim's Megadac 5017A series and Test Control Software. A detailed description of the bridge, instrumentation, gauge locations, and field testing procedures may be found elsewhere (13,14). Table 1 provides a summary of the various fatigue-prone details that were instrumented for this evaluation.…”

Section: Evaluation Proceduresmentioning

confidence: 99%

Effect of Cycle-Counting Methods on Effective Stress Range and Number of Stress Cycles for Fatigue-Prone Details

Clarke

Goodpasture

Bennett

et al. 2000

Transportation Research Record: Journal of the Transportation R

Self Cite

View full text Add to dashboard Cite

Two important parameters in fatigue life evaluations of existing steel highway bridges are the number of stress cycles experienced and the effective stress range. The inaccuracies in predicting remaining fatigue life can be attributed to either one of these two parameters. However, the AASHTO guide specification has no provisions for the cycle-counting methods to be used to determine these two parameters. A sensitivity analysis that addresses the effects of cycle-counting methods on the effective stress range and the number of cycles for various fatigue-prone details in both main and secondary bridge members is described. A comparison of five cycle-counting methods (level-crossing counting, peak counting, simple-range counting, mean-crossing-peak counting, and rain-flow counting) by using a simple variable-amplitude strain-time history showed that both the stress range and the number of cycles are sensitive to cycle-counting methods. Two of the most commonly used cycle-counting techniques for highway bridge variable-amplitude loading are the mean-crossing-peak and the rainflow cycle-counting methods. A comparison of the two methods by using field data taken under normal traffic showed that the rainflow cycle-counting method is more conservative than the mean-crossing-peak method. The relationship between the mean-crossing-peak and the rainflow cycle-counting methods was determined in the form of a correlation coefficient and a linear regression line. There is a nearly perfect positive correlation between the two methods. Therefore, values obtained for the effective stress range and the number of cycles by the mean-crossing-peak method can be converted to values for the rainflow method.

show abstract

Influence of Bridge Approach, Surface Condition, and Velocity on Impact Factors for Fatigue-Prone Details

Cited by 2 publications

References 2 publications

Assessing Dynamic Load Allowance of the Negative Bending Moment in Continuous Girder Bridges by Weighted Average Method

Assessing Dynamic Load Allowance of the Negative Bending Moment in Continuous Girder Bridges by Weighted Average Method

Effect of Cycle-Counting Methods on Effective Stress Range and Number of Stress Cycles for Fatigue-Prone Details

Contact Info

Product

Resources

About