Fatigue life of bridges under repeated highway loadings

  • 60 Pages
  • 4.18 MB
  • English
University of Alabama, Dept. of Civil and Mineral Engineering , University
Bridges -- Live loads, Bridges, Iron and steel -- Testing, Bridges -- Al



Statementby Terry R. Douglas ; sponsored by the Alabama Highway Department in cooperation with the Federal Highway Administration.
SeriesB.E.R. report ; no. 126-39
LC ClassificationsTG260 .D65
The Physical Object
Paginationiv, 60 p. :
ID Numbers
Open LibraryOL4603717M
LC Control Number77366836

Petitive loadings to which highway and railroad bridges are subjected This work, a well as lessons learned from the reiatively few cases of undesirable performance, have led to a bettor understanding of bridge fatigue behavior and to substantial changes in fatigue pro­ Ylsion of bridge design specifications.

Fatigue design of bridges From Although the fatigue limit state is an ultimate limit state, it requires a different approach to design from that of other limit states because failure is associated with the cumulative damage caused by repeated application of ‘common’ levels of stress. Fatigue damage accumulation in aluminum highway bridges under random loading is studied.

The fatigue life of welded joints has been determined both experimentally and from a fracture mechanics analysis. In the experimental part of the investigation, fatigue test series on. Fatigue is among the most critical forms of damage potentially occurring in steel bridges, while accurate assessment or prediction of the fatigue damage status as well as the remaining fatigue life of steel bridges is still a challenging and unsolved issue.

There have been numerous investigations on the fatigue damage evaluation and life prediction of steel bridges by use of deterministic or Cited by: remaining life assessment of steel bridges older than 50 years. A better understanding of the real behavior of steel bridges will help establishing an assessment procedure and guiding engineers when deciding betw een reinforcement and replacement.

Fatigue of steel bridges Most fatigue damages in a bridge are caused by the passages of single Cited by: 1. Bridge stress-range history / P.P. Christiano, L.E. Goodman, C.N.

Sun --Fatigue life of bridges under repeated highway loadings / Terry R. Douglas --Comparisons between induced girder stresses and corresponding vehicle weights / Conrad P.

Heins, Jr., Ratten L. Khosa --Loading history study of two highway bridges in Virginia / Wallace T. McKeel. Kim et al. proposed a Y-type perfobond rib shear connector in which the conventional perfobond rib shear connector is modified to improve various aspects of the performance, such as the shear resistance, vertical resistance, ductility, and workability for transverse rebar placement.

Fig. 1 shows the manufacturing process of a Y-type perfobond rib shear by: Fatigue analysis of long-span suspension bridges under multiple loading: Case study Article in Engineering Structures 33(12) December with Reads How we measure 'reads'.

Fatigue Fatigue Life Probability Density Function Fatigue Strength Traffic Load These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm : Antonino Giuffrè, Paolo Emilio Pinto.


Details Fatigue life of bridges under repeated highway loadings PDF

CHEN1*†, Y. XU2 1Department of Civil Engineering, Xiamen University, China 2Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, Hong Kong ABSTRACT Many long span suspension bridges have been built throughout the world in recent years Author: Z.

Chen, Y. However, many concrete structures such as highway pavements, highway bridges, railroad bridges, airport pavements and bridges, marine structure, etc.

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are subjected to dynamic loads. Fatigue strength data of concrete and other materials that are used in these structures for obtaining their safe, effective and economical design are Size: 2MB.

Fatigue failures are a concern for riveted steel bridges due to their long operational period under variable amplitude loading, with increasing intensity [1] [2] [3]. In addition, the majority of. T.H.T. Chan, Z.X. Li, J.M. KoFatigue analysis and life prediction of bridges with structural health monitoring data—Part II: applications International Journal of Cited by: TRB’s National Cooperative Highway Research Program (NCHRP) Report Fatigue Evaluation of Steel Bridges provides proposed revisions to Section 7—Fatigue Evaluation of Steel Bridges of the American Association of State Highway and Transportation Officials Manual for Bridge Evaluation with detailed examples of the application of the proposed revisions.

Fatigue Damage in Steel Bridges and Extending Their Life Fisher et al. [7] tested eight beams under VA loading, also with a Rayleigh spectrum.

Although the tests were carried out to million cycles, the data fell in a wide band along the sloped S-N line of the finite-life Size: 1MB.

life for existing bridges. This report documents that work and provides recommended revisions to the fatigue evaluation requirements in the AASHTO Manual for Main-tenance Inspection of Bridges.

In addition, recommended revisions to' the design re-quirements in the AASHTO Standard Spec,flcations for Highway Bridges are presented, in a similar. a single test vehicle and under normal traffic.

The results of the study indicate that the small stress cycles cause considerable fatigue damage and cannot be ignored in the design and evaluation of steel bridges for fatigue.

Based on the results of the experimental study and anFile Size: 5MB. 2 Identification and Rehabilitation of Fatigue Details Background • What is Fatigue • Described in IDM (04) – Fatigue Analysis • “Fatigue is the tendency of a member to fail at a stress level below the elastic limit when subjected to cyclical loading” – NHI Fracture Critical Inspection TechniquesFile Size: 5MB.

The American Society for Testing and Materials defines fatigue life, N f, as the number of stress cycles of a specified character that a specimen sustains before failure of a specified nature occurs.

For some materials, notably steel and titanium, there is a theoretical value for stress amplitude below which the material will not fail for any number of cycles, called a fatigue limit, endurance.

In steel bridges, fatigue is often a major problem limiting the load-carrying capacity and the residual life of existing bridges. The correct identification of fatigue-prone details in a bridge, along with well-planned inspection routines and successful strengthening and repair schedules, can contribute.

After obtaining the time-history spectra, the fatigue life and the remaining fatigue life for this detail can be calculated as a function of stress range and number of cycles. Detailed traffic load simulation is reported in a separate companion paper, Fatigue Assessment of Highway Bridges under Traffic Loading Using Microscopic Traffic : Timothy Saad, Chung C.

Fu, Gengwen Zhao, Chaoran Xu. The expected life of a steel highway bridge subjected to random, variable-amplitude traffic cycles is highly dependent on damage accumulation caused by various fatigue mechanisms. This study addressed some of the issues associated with developing probabilistic reliability models for steel bridge structures under vehicular traffic Size: KB.

Fatigue life estimation of metal historical bridges is a key issue for managing cost-effective decisions regarding rehabilitation or replacement of existing infrastructure. Because of increasing service loads and speeds, this type of assessment method is becoming relevant.

Hence there is a need to estimate how long these structures could remain in by: 6. result, the median fatigue life of a population of nominally-identical connections is considerably greater than N d.

Although fatigue tests have traditionally been conducted using a constant-amplitude stress range, highway bridges are subjected to stress cycles with varying amplitudes under service loads.

A cumulative damage theory is used to. Fatigue damage is normally estimated using Miner's rule of linear damage accumulation. Applying the stress life approach, the level of damage induced by a single stress cycle increases significantly with higher levels of stress.

Therefore, fatigue behavior of bridges is predominately a function of truck traffic parameters. The histograms ofFile Size: KB. Fatigue studies were conducted on a twin-girder, m~ltilaned highway bridge.

Two types of stress histories W'2re measured at several locations on the bridge. One type of stress history was measured during the passage of a test truck of knownFile Size: 2MB.

da Silva et al. / Fatigue analysis and life prediction of composite highway bridge decks under traffic loading Latin American Journal of Solids and Structures 10() – Figure 8 Four vehicles crossing the bridge: υ = 60km/h and l = m (Load Model III - LM-III). This paper is focused on developing fatigue-load model for highway bridges based on the measurements data of WIM (Weigh-in-Motion) in China.

In this paper, based on the analysis of vehicle flow data collected from six toll stations on Jing-Fu Highway which is one of the busiest highways in China, spring festival index and month index of vehicle flow are : F. Yue, X.S. Ren, M.

Description Fatigue life of bridges under repeated highway loadings PDF

Chen, Y.Y. Miao, M.Y. Li, Z.G. Hao. The first steps of the composite highway bridge study involved an extensive literature review of the techniques used to define steel and composite bridges service life, a study of the theoretical aspects of fatigue in steel, and the recommended procedures present in.

Deterministic and probabilistic approaches for calculating the remaining fatigue life were considered, and three methods are presented in this dissertation.

For deterministic approaches, the output of the equations is the year when the fatigue life has been exceeded for a specific probability of failure, whereas for probabilistic approaches. Fatigue load effects are studied in terms of effective truck weights, truck dimensions, and multiple presence in comparison with current evaluation procedures.

Experimental load and response data from the instrumented bridge along with computer models is used to study the effect of truck weight, volume, and multiple presence of the fatigue life.The Mechanical Properties of Reinforced Concrete Plate-Girders when Placed Under Repeated Simulated Vehicle Loads strain and bearing capacity of reinforced concrete members when placed under the fatigue loadings The overload ratio of vehicle loads should be strictly controlled in order to avoid or reduce the possibility of highway Author: Jinquan Zhang, Pengfei Li, Yan Mao, Zhenhua Dong.Fatigue life is a key concern in welded-steel frames for mobile equipment that experience large and varying dynamic loads.

For engineers who design welded-steel structures subject to dynamic.