Biparametric Shakedown Design of Steel Frame Structures

Jankovski, Valentinas; Atkočiūnas, Juozas

doi:10.5755/j01.mech.17.1.196

Cited by 10 publications

(6 citation statements)

References 25 publications

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“…Its value depends on the material properties [25][26][27][28]. If damage accumulation increases, thus d h >1 and oppositely, if damage accumulation decreases, then d h <1.…”

Section: The Concept and Mathematical Model Of Increasing The Cyclic mentioning

confidence: 99%

Increasing the cyclic strength of threaded joints through the unloading of cracked sections

Krenevičius

Kačianauskas

Leonavičius

et al. 2012

J min metall B Metall

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The cyclic strength of the axially loaded threaded joints is considered and the procedural method to increase their lifetime through the unloading of cracked sections is presented. The method operates by varying the mutual positions of the stud and the nut. It was shown how to exploit resources of the threaded joint after opening of the crack without reduction of the safety. The developed mathematical model allows control the accumulation of the fatigue damage as well as the crack growth in the roots of the stud thread. Increase of the cyclic lifetime is theoretically evaluated by the ratio of the numbers of loading cycles required to initiate cracks in the roots of unengaged and the most dangerous engaged turns of the stud. Performance of the elaborated technique is demonstrated by considering the crack growth in depth of the nut. The relative safety of the unloaded cross-sections containing cracks is studied. Comparison of the presented developments with standard safety requirements is presented

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“…Its value depends on the material properties [25][26][27][28]. If damage accumulation increases, thus d h >1 and oppositely, if damage accumulation decreases, then d h <1.…”

Section: The Concept and Mathematical Model Of Increasing The Cyclic mentioning

confidence: 99%

Increasing the cyclic strength of threaded joints through the unloading of cracked sections

Krenevičius

Kačianauskas

Leonavičius

et al. 2012

J min metall B Metall

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“…The solution is to build a detailed model of the section of the structure and attach it to the spatial bar system. More information on this type of engineering modelling can be found in [1,2].…”

Section: Modelling Of Details and Engineering Modellingmentioning

confidence: 99%

Analysis of local influences in structural details of the bridges

Rudzik¹,

Pradelok²

2017

Transport Problems

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Summary.The article analyses the problems of local influences in structural details of bridges as the critical locations, whose damages or excessive force may directly affect the safety of users. These analyses are shown on selected examples. Presented is the example of local changes in the forms of proper vibrations in the node of the truss bridge that can be used in expert issues concerning the causes of damages. The second example are the changes in stresses in the stay cable anchorage element including the nonlinear material models. Models of this type can be successfully used by engineers as they allow for analysis of selected structural details without the need for detailed mapping of the entire structure, but only a selected section. ANALIZA LOKALNYCH WPŁYWÓW W SZCZEGÓŁACH KONSTRUKCYJNYCH MOSTÓWStreszczenie. W artykule podjęto problematykę analizy lokalnych wpływów w szczegółach konstrukcyjnych mostów, jako miejscach newralgicznych, których uszkodzenia lub nadmierne wytężenie może bezpośrednio wpłynąć na bezpieczeństwo użytkowania. Możliwość takich analiz pokazano na wybranych przykładach. Przedstawiono przykład lokalnych zmian postaci drgań własnych w wyniku uszkodzenia w węźle mostu kratownicowego, który może być wykorzystany w zagadnieniach eksperckich, dotyczących poszukiwań przyczyny powstałego uszkodzenia. Drugim przykładem są zmiany naprężeń w elemencie zakotwienia cięgna podwieszającego z uwzględnieniem nieliniowych modeli materiału. Modele tego typu mogą być z powodzeniem wykorzystywane przez projektantów, gdyż pozwalają na analizę wybranych detali konstrukcyjnych bez konieczności szczegółowego odwzorowania w modelu całego obiektu, a jedynie wybranego fragmentu.

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“…However, the problem occurs when having to decide on the optimization criteria. The minimum volume of a structure [4], the minimum element size [5] and the stability [6] are commonly used criteria, although some questions have been related to different criteria [7,8].…”

Section: Introductionmentioning

confidence: 99%