Roofs of prestressed concrete membranes

Stráský, Jiří; Juchelková, Pavlína; Kaláb, Pavel; Nečas, Radim

doi:10.1002/suco.201600037

Cited by 8 publications

(4 citation statements)

References 4 publications

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“…The main reason why the construction of spatially curved surface structures is currently limited to a few prestige buildings 7–12 can be found in the costs for their construction. Most conventional building components are linear or planar, because timber formwork panels are flat and curved structures are harder to analyze.…”

Section: Shell Structuresmentioning

confidence: 99%

Actively bent concrete shells

Berger

Gericke

Feix

et al. 2020

Structural Concrete

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Shells are impressive structures due to the high load‐bearing capacity they exhibit when appropriately designed. Their construction, however, is usually associated with great efforts. In this paper, a novel approach for shell‐construction is presented that circumvents the necessity for doubly curved formwork. Instead, shells are erected from flat plates to which an eccentric force is applied causing them to bend into a desired curved shape. The form‐activating forces are induced by coupling a system of tendons to a thin—thus flexible—plate made from reinforced concrete. This approach may seem controversial as concrete exhibits a small ultimate strain and a brittle failure behavior. Therefore, it does not appear suited for the large deformations expected during the construction of actively bent structures. The investigations presented in this paper show the suitability of textile‐reinforced concrete for the fabrication of actively bent shells.

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Section: Shell Structuresmentioning

confidence: 99%

Actively bent concrete shells

Berger

Gericke

Feix

et al. 2020

Structural Concrete

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“…Lim and Plantier reported that increasing precast concrete arch tunnels have been designed and constructed in Korea (Lim and Plantier, 2020). Strasky et al (Strasky et al, 2017) presented that it is applicable to use precast members to build economical and architecturally interesting membrane-arch roof structures. Ong et al (Chong Yong et al, 2015) reviewed 9 kinds of available precast concrete closed spandrel arch bridge systems in the market and their advantages.…”

Section: Introductionmentioning

confidence: 99%

Static performance of precast concrete arches with carbon fiber reinforced polymer reinforcement

Zhao,

Zhou,

Kong

et al. 2024

Advances in Structural Engineering

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In this paper, static performances of a new precast concrete arch system with carbon fiber reinforced polymer (CFRP) reinforcement were investigated. Varied concrete strengths and segment types of precast concrete arches were tested. The results show that the increase of concrete strength can improve the bearing capacity of the precast arches with CFRP reinforcement. The ultimate bearing capacity of the precast arches segmented at the arch vault with CFRP reinforcement can reach or even exceed that of complete arches, while the precast arch segmented at the shoulder had lower ultimate load. A theoretical analysis method was proposed to predict the failure and bearing capacity of the precast concrete arches with CFRP reinforcement, which were found to be in close agreement with the experimental result.

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“…In the field of architecture, there was a freeform surface structure which defined specified fixed points of the perimeter as the geometric constraint conditions [24]. In addition, NURBS (nonuniform rational B-spline) is an effective method to express the geometry of freeform shell structures through the coordinates of the NURBS control points, and restressed membrane roofs of freeform could be suspended on arches or suspension cables [25,26]. From above, we can draw from the form of constraint conditions of freeform surface structures in the field of architecture to obtain desired asymmetric membrane in the design of multifocal liquid lens.…”

Section: Introductionmentioning

confidence: 99%

Progressive Multifocal Liquid Lenses Based on Asymmetric Freeform Surface Structure of Nonuniform Thickness Elastic Membranes with Different Constraints

Jia

Zhang

2019

International Journal of Optics

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For a progressive multifocal liquid lens with an elastic membrane deformed by liquid pressure, to realize a reasonably power distribution, asymmetric deformation characteristics of the membrane surface are needed. Based on the asymmetric freeform surface structure, this paper proposed progressive multifocal liquid lenses focused by liquid with nonuniform thickness membranes. The structure and mathematical model of power distribution for the lens are introduced. The membrane deformation and the corresponding power distribution of the lenses with asymmetric freeform surface are predicted and compared under uniform pressure load and different boundary conditions using the finite element method. An optical testing system is constructed to analyze the optical characteristics of the fabricated lenses through observing the focusing performance of the F target image at different regions of the lenses. Experimental results show that the liquid lenses can realize as asymmetrical progressive multifocal liquid lenses after liquid accommodation; meanwhile, the trends of power distribution of the lenses generally agree well with simulations.

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Roofs of prestressed concrete membranes

Cited by 8 publications

References 4 publications

Actively bent concrete shells

Actively bent concrete shells

Static performance of precast concrete arches with carbon fiber reinforced polymer reinforcement

Progressive Multifocal Liquid Lenses Based on Asymmetric Freeform Surface Structure of Nonuniform Thickness Elastic Membranes with Different Constraints

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