Curved footbridges supported by a shell obtained through thrust network analysis

Fenu, Luigi; Congiu, Eleonora; Lavorato, Davide; Briseghella, Bruno; Marano, Giuseppe Carlo

doi:10.1016/j.jtte.2018.10.007

Cited by 6 publications

(5 citation statements)

References 23 publications

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“…Therefore, the design problem that was asked to solve was: taking into account the form and the structural functioning of curved bridges and of shell-supported bridges, which is the form that a curved shell-supported bridge should have to better transfer deck loads to earth? To answer this question it is worth noting that while a straight deck supported along a single line by a straight girder is always unstable (Figure 9a), a curved deck supported by a curved girder along a curved line can be stable, thanks to the peculiar properties of ring girders [28,[45][46][47][48]. Therefore, while Musmeci needed to support the straight deck of Basento Bridge using point supports symmetrically aligned along two parallel lines (Figure 9b), Schlaich designed his suspended or cable-stayed curved bridges by hanging either the outer or the inner deck edge, that is hanging the deck along one curved line only.…”

Section: Curved Shell-supported Bridgesmentioning

confidence: 99%

“…A box girder with high torsional stiffness is usually used to absorb the torsional moments induced by the eccentric loads acting on the cantilever deck. In the recent years, an external pretensioning system applied to the upper flange of the girder has been used in some footbridges to equilibrate the torsional mo- ments, as also done in the case study presented in this paper [28,[45][46][47][48].…”

Section: Curved Shell-supported Bridgesmentioning

confidence: 99%

“…For instance, at the abutments the shell can be restrained either at some points with concrete hinges [49] (three by side in the example under consideration) or along one curve, provided that the given boundary conditions allow the shell surface to be anticlastic. Contrary to the upper edge, the shell lower edge is not given, and the curve describing it is free to be found by the form-finding procedure [47,48,50]. For given boundary conditions, different form-finding methods can be used.…”

Section: Curved Shell-supported Bridgesmentioning

confidence: 99%

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Shell-supported footbridges

Fenu

Congiu

Marano

et al. 2020

Curved and Layered Structures

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Architects and engineers have been always attracted by concrete shell structures due to their high efficiency and plastic shapes. In this paper the possibility to use concrete shells to support footbridges is explored. Starting from Musmeci’s fundamental research and work in shell bridge design, the use of numerical form-finding methods is analysed. The form-finding of a shell-supported footbridge shaped following Musmeci’s work is first introduced. Coupling Musmeci’s and Nervi’s experiences, an easy construction method using a stay-in-place ferrocement formwork is proposed. Moreover, the advantage of inserting holes in the shell through topology optimization to remove less exploited concrete has been considered. Curved shell-supported footbridges have been also studied, and the possibility of supporting the deck with the shell top edge, that is along a single curve only, has been investigated. The form-finding of curved shell-supported footbridges has been performed using a Particle-Spring System and Thrust Network Analysis. Finally, the form-finding of curved shell-supported footbridges subjected to both vertical and horizontal forces (i.e. earthquake action) has been implemented.

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Section: Curved Shell-supported Bridgesmentioning

confidence: 99%

Section: Curved Shell-supported Bridgesmentioning

confidence: 99%

Section: Curved Shell-supported Bridgesmentioning

confidence: 99%

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Shell-supported footbridges

Fenu

Congiu

Marano

et al. 2020

Curved and Layered Structures

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“…At the same time, more and more landscape bridges require the use of beautiful curved bridge decks. How to balance the mechanical performance requirements of super large-span structures and the aesthetic requirements of curved bridges is faced by bridge engineers [1][2][3][4] .…”

Section: Introductionmentioning

confidence: 99%

Design of Pedestrian Landscape Flying-Bird Arch Bridge with Cable-Stayed Cable and Lissajous Curved Arch Rib

Zhu

Wang

Xu³

2021

E3S Web Conf.

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In view of the demand of super long span pedestrian landscape bridge with curved deck, this paper proposes a kind of cable-stayed and flying-brid arch bridge with Lissajous curved arch rib and double curved bridge deck. Its plane positive projection is Lissajous curve figure, the side elevation of the arch rib is the shape of the cable-stayed and flying-brid arch, and the arch foot cable and the upper space cable between the arch ribs are installed on the Lissajous spatial curved arch rib with concrete-filled steel tube to form a self balanced structure system, which floats and drags across the river. The main arch sling and the tail cable are installed, the double curved bridge deck and the central circular sightseeing platform are suspended, and multiple groups of spatial cables work well together to complement each other, with having complementary advantages. Combined with the actual project, the parameter design is carried out, the Midas finite element model is established, the internal force of the structure is calculated, the structural dynamic mode and stability analysis are carried out, the rationality of its structural performance is verified by analysis and research.

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“…It is well known that structural optimization is an important tool, both for sizing structure members and for helping the designer find the most suitable structural form [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. Today, structural optimization is common in mechanical and aeronautical engineering, and in recent years it has been progressively adopted for structural-engineering applications, such as sizing building and bridge members [29][30][31][32][33][34][35][36], detailing reinforced concrete structures [37][38][39][40][41][42][43][44][45], shaping bridges [46][47][48][49][50], domes [51][52][53][54], and other threedimensional structures [55].…”

Section: Introductionmentioning

confidence: 99%

A Heuristic Approach to Identify the Steel Grid Direction of R/C Slabs Using the Yield‐Line Method for Analysis

Fenu

Colasanti

Congiu

et al. 2019

Advances in Civil Engineering

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In the last few years, nonregular reinforced concrete (R/C) slabs have become more popular in buildings and bridges due to architectural or functional requirements. In these cases, an optimum design method to obtain the ultimate load capacity and the minimum reinforcement amount should be used. For simple R/C slabs, the yield-line method is extensively used in engineering practice. In addition to strength, the “true” failure mechanism is also obtained by identifying the parameters that define it and minimizing the collapse load. Unfortunately, when the mechanism is too complicated to be described or defined by several parameters (e.g., in slabs with complicated geometry), the method becomes more difficult because the system of nonlinear equations becomes harder to solve through traditional methods. In this case, an efficient and robust algorithm becomes necessary. In this paper, a structural analysis of R/C slabs is performed by using the yield-line method in association with a zero-th order optimization algorithm (the sequential simplex method) to avoid calculating gradients as well as any derivatives. The constraints that often limit these parameters are taken into account through the exterior penalty function method, leading to a successful solution of the problem. Considering that the direction of each yield-line is sought by minimizing the ultimate load and finding the parameters defining the collapse mechanism, another parameter concerned with the direction of an orthotropic reinforcement grid is introduced. In this way, the number of unknown parameters increases, but aside from obtaining the ultimate load and the parameters defining the collapse mechanism, the solution also finds both best and worst reinforcement orientations.

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Curved footbridges supported by a shell obtained through thrust network analysis

Cited by 6 publications

References 23 publications

Shell-supported footbridges

Shell-supported footbridges

Design of Pedestrian Landscape Flying-Bird Arch Bridge with Cable-Stayed Cable and Lissajous Curved Arch Rib

A Heuristic Approach to Identify the Steel Grid Direction of R/C Slabs Using the Yield‐Line Method for Analysis

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