Analytical and numerical analysis of the torsional response of the multi-cell deck of a collapsed cable-stayed bridge

Scattarreggia, Nicola; Galik, William; Calvi, Paolo M.; Moratti, Matteo; Orgnoni, Andrea; Pinho, Rui

doi:10.1016/j.engstruct.2022.114412

Cited by 13 publications

(4 citation statements)

References 11 publications

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“…The Morandi bridge, depicted in Figure 7, represented an important infrastructure for the Italian road network, part of the motorway connecting several North-West urban centres to the French border. While the entire structure, as well as its foundation scheme, is comprehensively described in, e.g., Morandi,19 in what follows special attention will be given to the collapsed cable-stayed 'balanced system 9' (see, e.g., Calvi et al, 20 Malomo et al 21 and Scattarreggia et al 22 ), and in particular to its post-compressed RC concrete stays.…”

Section: Structural Systemmentioning

confidence: 99%

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Numerical dynamic characterisation of concrete bridge stays

Orgnoni

Pinho

Calvi

et al. 2023

Earthq Engng Struct Dyn

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Following the recent collapse of a cable‐stayed bridge in Genoa, Italy, an interest has arisen to understand if it would have been possible for unknown localised material deterioration and/or decrease in prestress levels to introduce noticeable changes in the dynamic behaviour of RC stays. As such, in this study we start by reviewing past research work, experimental and analytical, on the effects that prestress level may or may not have on the dynamic response of RC beam elements. We then review also available analytical formulations used to determine the natural frequency of vibration of prestressed beams, and, subsequently, complete the preliminary investigation on the effects of prestress levels, and local damage, through the analysis of finite element models of prestressed beams and stays. The comparison of analytical and numerical estimations with results obtained from an in‐situ dynamic characterisation campaign on a RC bridge stay is also undertaken. In the second part of the study, we explicitly consider the Morandi bridge case‐study, for which finite element models of the stays alone, as well as of the full bridge, are developed and analysed. The obtained results are then also compared with the observations made in pre‐collapse in situ dynamic characterisation endeavours. All results obtained and discussed lead to the conclusion that, most regrettably, dynamic characterisation endeavours do not have the capability of providing insight on possible localised material deterioration or partial reduction of the average state of compression in this type of structural elements.

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Section: Structural Systemmentioning

confidence: 99%

“…While the entire structure, as well as its foundation scheme, is comprehensively described in, e.g., Morandi, 19 in what follows special attention will be given to the collapsed cable‐stayed ‘balanced system 9’ (see, e.g., Calvi et al., 20 Malomo et al 21 . and Scattarreggia et al 22 …”

Section: Case‐study: the Morandi Bridgementioning

confidence: 99%

Numerical dynamic characterisation of concrete bridge stays

Orgnoni

Pinho

Calvi

et al. 2023

Earthq Engng Struct Dyn

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“…The discretization adopted was devised with a view to balance computational accuracy and analysis time. Indeed, the selection of the appropriate mesh sizes for each structural element/region was guided, as proposed by Scattarreggia et al (2022) [12], by the expected damage distribution. A coarser mesh was therefore allotted to regions that would not suffer extensive damage or which with unlikelihood undergo large deformations, while more refined element subdivisions were applied to regions which are deemed to potentially trigger the collapse or exhibit significant damage/deformation.…”

Section: Numerical Modellingmentioning

confidence: 99%

Nonlinear Analysis of a Large Rc Cantilever Grandstand of San Siro Meazza Stadium in Milan Using the Applied Element Method

Scattarreggia,

Cogliano,

Calvi

et al. 2023

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Stadiums may suffer from vibration serviceability problems when a large group of individuals in a crowd are involved in a coordinated motion due to their common light weight and adopted line of sight. Considering old stadium structures may have been designed without considering the dynamic effects associated to people jumping up and down or moving in synchro to a played song, it is of relevant interest to assess their safety usually conducted using Finite Element models. In this work, the Applied Element Method, a low-cost computational approach based on the mechanical interaction between rigid bodies and zero-thickness nonlinear interface springs, is used to assess the nonlinear structural performance of a sector of the reinforced concrete San Siro Meazza stadium in Milan, characterized by a large RC cantilever. Once the numerical model has been validated using available experimental data and results obtained through traditional FE models, nonlinear static analyses have been performed to evaluate the vertical capacity and the potential collapse mechanism. Thereafter, dynamic analyses have been conducted with a view to assess the structural response using a possible dynamic jumping load model. Displacement and acceleration time-histories have highlighted the nonlinear structural response of the analyzed portion when subjected to periodic dynamic loadings with frequencies resonant with those of the structure. Finally, a theoretical collapse mechanism has been numerically obtained.

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“…Zhen Xu [8] simulated the complete progressive-collapse process of stone arch bridges using the general-purpose FE program MSC Marc, which adopted a three-dimensional (3D) FE model and enabled a nonlinear analysis using the contact algorithm in conjunction with the element-deactivation technique. Nicola Scattarreggia [9] adopted AEM-based models to carry out the explicit modeling of the torsional-flexural-shear failure of a bridge deck accounting for the damage propagation during a collapse, and a frame-by-frame verification of the numerical modeling was compared with footage of the observed collapse. Pennington et al focused on the cause of the overturning of the Buxi railway bridge and summarized and proposed relevant engineering measures based on the process and accident data [10].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of the Anti-Overturning Theory of Single-Column Pier Bridges

Xu¹,

et al. 2023

Sustainability

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In recent years, overturning accidents at single-pier bridges have occurred frequently, resulting in significant property losses and safety accidents. Overturning accidents show that there are still many hidden dangers in the design, operation, and management of existing single-pier bridges. Therefore, this paper takes the K503 + 647.4 separated overpass of the Hegang–Dalian Expressway as the research object and carries out an onsite anti-overturning stability test of a single-column pier bridge. Through loading under various working conditions, the displacement changes of each support are measured, and the reaction changes of the supports are calculated. In the process of simulating the field test using the finite element program ANSYS, a rigid model based on ideal support and an elastic model considering beam deformation are established, and the accuracy of the elastic model is verified by comparison with the field-measured data. Furthermore, a series of parameters, such as the bridge side-span ratio, bridge span number, bearing spacing, loading position, and torsional rigidity, are varied, and finite element simulation is carried out on the basis of the elastic model. Through comparison of the results, a relationship between the parameters of the single-pier bridge and the anti-overturning ability is obtained, which provides a theoretical basis for anti-overturning design research and the effective reinforcement of single-pier bridges.

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Analytical and numerical analysis of the torsional response of the multi-cell deck of a collapsed cable-stayed bridge

Cited by 13 publications

References 11 publications

Numerical dynamic characterisation of concrete bridge stays

Numerical dynamic characterisation of concrete bridge stays

Nonlinear Analysis of a Large Rc Cantilever Grandstand of San Siro Meazza Stadium in Milan Using the Applied Element Method

Experimental and Numerical Investigation of the Anti-Overturning Theory of Single-Column Pier Bridges

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