Shear failure of pre-stressed concrete T-shaped girders: Experiment and nonlinear modeling

Funding informationDutch Ministry of Infrastructure and the Environment.Many existing reinforced concrete bridges in The Netherlands are suspected of having insufficient shear strength, hence a methodical approach is necessary to assess them. The aim of this paper is to provide a structured approach for assessment of the reinforced concrete slab bridges, which make up a considerable proportion of the Dutch bridge stock. The proposed method uses the levels of approximation introduced in the fib Model Code for Concrete Structures 2010. The recommendations at all levels are linked to experimental research. The different levels include spreadsheet-based calculations (the "Quick Scan"), linear finite element models, nonlinear finite element models, the analysis of a structure with cracked concrete, and, for exceptional cases, proof loading of the structure. The result of this approach is a structured method of levels of assessment that can be used when many bridges need to be assessed. For most bridges, assessment at the lowest level will prove sufficient. For a limited number of cases, higher levels of assessment will offer options and guidelines for a more in-depth study of the structure being assessed. K E Y W O R D Sassessment, bridges, finite element models, hand calculations, levels of approximation, reinforced concrete, shear, slabs, slab bridges 1 | INTRODUCTION | Bridges in The NetherlandsThe Dutch road network went through a large period of expansion in the decades of reconstruction after the Second World War. The bridges that were built at this time are reaching the end of the service lives originally envisaged, but replacing all these structures is not practical. The economic cost of replacing these structures is high, as are likewise the ecological cost (associated with the CO 2 emissions in the production and transportation of the materials) and the social cost (such as traffic delays, which lead to large indirect costs in a densely populated country like the Netherlands). numerous reinforced concrete slab bridges that were built without shear reinforcement in the Netherlands need to be assessed with regard to their shear capacity. The scope of this study covers 600 reinforced concrete solid slab bridges, most of which were built during the 1960s and 1970s. | Levels of approximationThe recently published fib Model Code for Concrete Structures 2010 6 allows the shear and punching capacities to be calculated for different "levels of approximation." The

Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Levels of approximation for the shear assessment of reinforced concrete slab bridges

Lantsoght

Boer

Veen

2017

“…The obtained information was used to set up their stochastic models and response surfaces in an optimum manner for particular limit states and for the subsequent determination of selected uncertain design parameters followed by load‐bearing capacity and reliability assessments of the bridge . The dominant input parameters were also put to similar use in performance of the reliability‐based optimization of precast T‐shaped structural members …”

Section: Case Studiesmentioning

confidence: 99%

A comparison of sensitivity analyses for selected prestressed concrete structures

Lehký

Pan

Novák

et al. 2018

Self Cite

Three sensitivity analysis methods are employed to achieve the optimum selection of the dominant random variables of selected concrete structures. The first of these methods uses the nonparametric rank-order statistical correlation between the basic random input variables and the structural response output variable. The second is neural network ensemble-based sensitivity analysis and the last of them is sensitivity analysis in terms of coefficient of variation. All of the methods were utilized and compared for two selected concrete structures: a prestressed concrete bridge made of MPD girders, and T-shaped prestressed concrete roof girder. The obtained information was used to set up a stochastic model and response surfaces in an optimum manner and was employed in the subsequent determination of selected uncertain design parameters followed by load-bearing capacity and reliability assessment.artificial neural network, prestressed concrete, sensitivity analysis, structural reliability, surrogate modeling

“…Except for the LoA approach proposed in MC2010, the principle has also been adopted for calculation of shear and punching capacity in literature from different countries, e.g., Germany, Austria and Czech, Sweden and the Netherland . The calculation methods form the MC2010 have been applied for the shear and punching strength of RC slabs in different cases.…”

Section: Literature Reviewmentioning

confidence: 99%

Shear assessment of a reinforced concrete bridge deck slab according to level‐of‐approximation approach

Shu

2018

Reinforced concrete (RC) slabs without shear reinforcement are commonly used for existing bridge structures. For such structures, shear and punching can be the governing failure modes at the ultimate limit state if subjected to large concentrated loads. The aim of this study is to examine a structured approach for the analyses of the RC bridge deck slabs, which make up a considerable proportion of the currently used bridge decks. The method used for analyses is the levels‐of‐approximation introduced in fib Model Code for Concrete Structures 2010. The different levels include simplified calculation method, linear finite element analysis as well as non‐linear finite element analysis. The differences between analysis methods at different levels of analyses were discussed regarding one‐way shear and punching shear behavior of the slab.