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  • 1.
    Ansell, Anders
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
    Dynamic testing of steel for a new type of energy absorbing rock bolt2006In: Journal of constructional steel research, ISSN 0143-974X, E-ISSN 1873-5983, Vol. 62, no 5, p. 501-512Article in journal (Refereed)
    Abstract [en]

    Rock bolts of steel are the most frequently used components in systems for rock reinforcement. Special types are used as energy absorbing elements in systems exposed to dynamic loads and these must yield plastically under high loading velocities. A new type of energy absorbing rock bolt of soft steel has been suggested and tested. To investigate the strain rate effects on the yield stress and ultimate strength of the steel were bars dynamically loaded in a high speed testing machine. The observed tensile forces can be divided into one part from impact and another from quasi-static straining. The tests showed that there was a considerable strain rate effect on the yield stress of the steel. It is recommended that higher dynamic yield stresses are utilized in the dynamic design which has to incorporate the risk of high peak forces from impact loading.

  • 2.
    Leander, John
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Reliability evaluation of the Eurocode model for fatigue assessment of steel bridges2018In: Journal of constructional steel research, ISSN 0143-974X, E-ISSN 1873-5983, Vol. 141, p. 1-8Article in journal (Refereed)
    Abstract [en]

    In European countries, the design of bridges is conducted following the specifications in the Eurocodes. For verification against fatigue of steel bridges, a simplified model is suggested based on a single vehicle load model together with λ factors to estimate a representative stress range. Since the release of the Eurocodes the accuracy of this format has been discussed and questioned. In the current paper, a probabilistic model for fatigue assessment is suggested estimating the load effect from bridge weigh-in-motion (BWIM) measurements. The probabilistic model has been used to estimate the reliability reached with the existing verification format for road bridges. The result shows a large scatter depending foremost on the bridge geometry and the traffic volume. A tentative calibration of the verification format has been performed and new functions for two of the λ factors have been derived. With these new functions a significant improvement in the consistency of the reliability level has been achieved. The study demonstrates the need for a more extensive calibration of the Eurocode model and indicates the parameters to focus on.

  • 3.
    Leander, John
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Karoumi, Raid
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Dynamics of thick bridge beams and its influence on fatigue life predictions2013In: Journal of constructional steel research, ISSN 0143-974X, E-ISSN 1873-5983, Vol. 89, p. 262-271Article in journal (Refereed)
    Abstract [en]

    An analytical model for moving load analysis is derived based on the Timoshenko beam theory. The model enables rapid and reliable analyses of the influence of dynamics on the fatigue life prediction of thick beams. This type of beams is typical for open deck railway bridges. The number of modes required in a modal superpositioning is studied as well as the influence of damping and support stiffness. A total of 22 bridge beams from open deck bridges presented in the literature is included in the study. The results clearly show a fundamental difference in the behaviour of one span beams and continuous beams. Especially in the case of assessment of existing bridges, the quasi static model of the Eurocode renders an excessive safety margin. For the majority of continuous beams studied, the dynamic response is lower than the static response resulting in no dynamic amplification. Such an outcome can have a substantial influence on the remaining fatigue life prediction due to the exponential relation between the stress range and the fatigue life.

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