Structural Optimization of Network Arch Bridges with Hollow Tubular Arches and Chords

Pipinato, Alessio

doi:10.5539/mas.v12n2p36

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…Tey obtained minimal bending moments at the angle values α � 42-55 °. Similar problems were investigated by Islam Ahsan and Ahsan [15,16], and Pipinato [17,18]. Islam Ahsan showed that circular arch network bridges compared to parabolic arch bridges have a lower arch rise and a lesser number of hangers.…”

Section: Introductionmentioning

confidence: 62%

Insights into Optimal Schemes of Radial Network Arch Pedestrian Bridge

Belevičius

Rusakevičius

Valentinavičius

2022

Advances in Civil Engineering

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The main objective of the article is to find the optimal ranges of the cardinal topological, shape, and dimensional parameters that fully describe the constructional scheme of pedestrian radial network arch bridges of moderate spans. This task is solved by formulating the global optimization problem and seeking the minimum mass of the whole bridge structure. An optimal bridge scheme was obtained by tuning a large set of interdependent design parameters of diverse character: the topological parameters–the type of hanger arrangement, and the number of hangers; the shape parameters–hanger spread and central section angles, the alteration of these angles, and the arch rise; and the sizing parameters–all cross-sectional dimensions of structural members. Mathematically, this is a constrained mixed-integer global optimization problem solved by a stochastic evolutionary algorithm. Plane light-deck bridges of typical moderate 30, 45, 60, 75, and 90 m spans were optimized. Decisive design parameters and their rational ranges for all spans were revealed. In addition, the effects of some simplifications of the general bridge scheme were shown: using the constant spread and central section angles; imposing certain values on the ratio arch rise/bridge span; bounding the hanger diameters to a given value; and so on. Obtained results clearly indicate that the design recommendations for the lightweight network arch bridges should differ from the recommendations for similar automotive and railway bridges. Our findings are: the optimal ratio of arch rise to the bridge span is 0.20–0.30, the number of hangers is >40 even for the shortest spans, the spread angle between hangers is 30°–40°, and the girder mass amounts to ∼30% of the total bridge mass, while the mass of hangers amounts up to 20% and increases when imposing constraints on the minimal radius at the expense of diminishing arch mass.

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Section: Introductionmentioning

confidence: 62%

Insights into Optimal Schemes of Radial Network Arch Pedestrian Bridge

Belevičius

Rusakevičius

Valentinavičius

2022

Advances in Civil Engineering

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“…In the design process, the stability of steel arch is the key issue. Mostly, linear buckling analysis (LBA) is conducted in the finite elements analysis (FEA) software [2,4,5]. Alternatively, the solution for beam supported by flexible springs is used as a first estimation, especially in optimization tasks, due to its simplicity.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear buckling analysis of network arch bridges

Błonka

Skrętkowicz

2022

Studia Geotechnica Et Mechanica

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The paper presents designing due to the instability in-plane problem of the net-arch bridge. Firstly, three essential nonlinear examples are benchmarked in a finite element software. Secondly, linear and nonlinear buckling analyses are conducted, with the purpose of investigating the impact of nonlinear behavior of cables on steel arch instability, involving a comparison of the critical load factor and form from both the linear buckling and the post-critical third-order theory analyses. The impact of prestress and tension, elevation, and hanger failure on instability is discussed. Moreover, a new method for determining nonlinear buckling form for the net-arch structure is proposed in order to allow implementation of Unique Global and Local Imperfection method in cable structures. Calculations are conducted in the finite element software. The model of the network arch bridge is based on the bridge over Vistula River in Cracow.

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“…to the appropriate sequence of controls obtained from different conditions. Despite a reach literature published in recent years on the development of arch-shaped optimization [2,8,20,23,25], to the best authors' knowledge these works do not include research in the area of optimal control . The present work is a continuation of the research topic presented in [6].…”

Section: Introductionmentioning

confidence: 99%

Structure of Optimal Control in Optimal Shaping of the Steel Arch

Mikulski

Jasińska

Dąbrowska

2022

Civil and Environmental Engineering Reports

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The paper presents the problem of optimal shaping of the H-bar cross-section of a steel arch that ensures minimal mass. Nineteen combinations of nine basic load states are considered simultaneously in the problem formulation. The optimal shaping task is formulated as a control theory problem within the formal structure of the maximum Pontriagin’s principle. Since the ranges of constraint activity defining the control structure are a priori unknown and must be determined numerically, assuming the proper control structure plays a key role in the task solution. The main achievement of the present work is the determination of a solution of the multi-decision and multi-constraint optimization problem of the arch constituting a primary structural system of the existing building assuring the reduction of the structure mass up to 42%. In addition, the impact of the assumed state constraint value on the solution structure is examined.

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Structural Optimization of Network Arch Bridges with Hollow Tubular Arches and Chords

Cited by 4 publications

References 7 publications

Insights into Optimal Schemes of Radial Network Arch Pedestrian Bridge

Insights into Optimal Schemes of Radial Network Arch Pedestrian Bridge

Nonlinear buckling analysis of network arch bridges

Structure of Optimal Control in Optimal Shaping of the Steel Arch

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