A probabilistic approach for a T-stub ultimate strength assessment using response-surface approximation

The main goal of the study is to examine and demonstrate the application of a developed probabilistic framework to the analysis of a chosen general type of steel connection component in order to obtain the basic characteristics of its mechanical behaviour with regard to the chosen type of the input geometry and material properties. Accordingly, as a typical representative of the component method proposed by the Eurocode the equivalent T-stub was chosen as a subject of the study. This type of structural element has the capability to address the behaviour of several parts of the connection: column flange in bending, end plate in bending and flange cleat in bending. A method is proposed to determine the probability density function of the ultimate strength using a response-surface approach coupled with FEM applied to a stochastic structural model. The results of a study were processed by means of sensitivity analysis to determine the importance level of the input variables

Analysis of High - Strength Steel Pin Connection

The paper presents analytical and numerical analysis of the pin connection resistance made of high-strength steel used in the temporary bridge ŽM 60. The assessment of the pin connection was performed according to standard [1] and also using numerical analysis by means of numerical sophisticated calculations based on FEM analyses

Pinned - Fixed Beam - Column Resistance Verification According to European Standards

Verification of beam-column resistance can be accomplished according to design approaches given in EN 1993-1-1 [1]. These approaches are derived from verification of single span beam with pinned end conditions subjected to compression and bending moments. In the case of different end conditions, the application of those approaches is not so accurate and more difficult. Therefore, the comparison of verification according to above standard EN 1993-1-1 [1] as well as EN 1999-1-1 [2] to results of experimental analyses of beam-columns having pinned-fixed end conditions subjected to an eccentric compressive force simulating the behaviour of columns integrated into frames is presented in this paper

Existing bridge evaluation using deficiency point method

In the transforming EU countries, transportation infrastructure has a prominent position in advancing industry and society. Recent developments show, that attention should be moved from the design of new structures towards the repair and reconstruction of existing ones to ensure and increase their satisfactory structural reliability and durability. The problem is very urgent because many construction projects, especially transport infrastructure, in most European countries are more than 50-60 years old and require rehabilitations based on objective evaluations. Therefore, the paper presents methodology of existing bridge evaluation based on reliability concept using Deficiency Point Method. The methodology was prepared from the viewpoint to determine the priority order for existing bridge rehabilitation

Existing bridge evaluation using deficiency point method

In the transforming EU countries, transportation infrastructure has a prominent position in advancing industry and society. Recent developments show, that attention should be moved from the design of new structures towards the repair and reconstruction of existing ones to ensure and increase their satisfactory structural reliability and durability. The problem is very urgent because many construction projects, especially transport infrastructure, in most European countries are more than 50-60 years old and require rehabilitations based on objective evaluations. Therefore, the paper presents methodology of existing bridge evaluation based on reliability concept using Deficiency Point Method. The methodology was prepared from the viewpoint to determine the priority order for existing bridge rehabilitation

Evaluation of Elder and Historical Bridges

AbstractBridge structures are designed on lifetime, which is given in standards and relevant time of design. The design lifetime of bridge structures was 80 years according to expired Slovak standard STN. New design lifetime of the newly designed bridges extends to Td = 100 years by establishing Eurocode STN EN. In the frame of research activities of Department of Structures and Bridges, the theoretical approach for evaluation of existing bridge structures was developed taking into account Eurocodes. However, the problems occur in the case of elder bridges with real lifetime over 100 years, or in the case of remaining lifetime extension over 100 years

Elastic Critical Resistance of the Simple Beam Grillage Resulting from the Lateral Torsional Buckling Condition: FEM Modelling and Analytical Considerations

Transversely loaded beam grillages are quite often used in industrial construction. In order to produce a safe design of such structures, it is necessary to account for the lateral torsional buckling phenomenon, which reduces load-bearing capacity. To be able to calculate the relevant reduction factor, the elastic critical load must be determined. As regards the existing design practice for such structures, simplified conditions are assumed for the mutual restraint of the component beams. However, this approach does not correspond to reality. This study discusses the results of numerical investigations and analytical calculations concerning the effect of the elastic action of simple beam grillage (SBG) joints on the critical load, which results from the lateral torsional buckling (LTB) condition. The SBG was defined as a flat system of interconnected beams, unstiffened laterally and loaded perpendicularly to the grillage plane. The analysis covered H-shaped grillages with different span ratios of component beams, in which the main (coupling) beam was decisive for instability. The effectiveness of the use of closed-section stiffeners at the grillage joints was also investigated. The grillage elastic critical resistances (ECR) were determined for two variants of joint stiffening. The computations were performed by means of FEM numerical simulations. The spatial models were discretised with the following elements: (1) solid ones in Abaqus, (2) shell ones in ConSteel, and (3) thin-walled bars in ConSteel. The LTB critical moments of the weakest beam (critical beam), elastically restrained against warping and against lateral rotation (in the LTB plane), were computed using the analytical methods developed by the authors. To this end, the methods were proposed to determine the indexes of the critical beam elastic restraint in the adjacent stiffening beams. In the study, it was demonstrated that (1) taking into account the conditions of mutual elastic restraint and interaction of the component beams provides a more accurate assessment of the grillage ECR, (2) the use of closed-section stiffeners in the grillage joints increase the ECR compared with classic flat stiffeners, (3) the grillage ECR can be estimated based on the critical moment Mcr of the weakest beam (critical beam) when the conditions of its elastic restraint in joints are accounted for

Statistická přejímka prvků ocelových mostních konstrukcí

The paper presents a new statistical approach to the acceptance of steel bridge structure members based on their rehability. Two exaples are shown to demonstrate this methods for the acceptance of compression members. The described methods anables to determine the failure probability of the set of members with higher accuracy.Článek presentuje nový statistický přistup k problematice přebiráni prvků ocelových mostů vycházející z jejich spolehlivosti. Jsou uvedeny dva příklady, které demonstrují uvedenou metodu při přejímce tlačených prvků. Popsaná metoda umožňuje stanovit pravděpodobnost poruchy souboru zkoumaných prvků s větši přesností.Der Beitrag befafsst sich mit dem neuen statistischen Zutritt für die Übernahme der Stahlbrückenelementen, der an iher Verlässichkeit gegründet ist. Zwei Beispiele sind angeführt, um die Methode für die Übernahme der druckbelasteten Elementen vorzustellen. Diese Methode vermägt die Wahrscheinlichkeitsverletzung der Tragfähigkeit der Stahlelementen mit höher Genauigkeit bestimmen

Analysis of the Stringer-to-Cross-Beam Riveted Joints Behaviour

The main aim of the paper is to present results of the numerical and experimental studies related to the analysis of the real stiffness of the stringer-to-cross-beam connection in order to avoid approximation of this joint by means of complicated 2D modelling and to use simplified 1D model for global analyses of bridges with open bridge decks