Additive manufacturing is gaining ground in the construction industry. The potential to improve on current construction methods is significant. One of such methods being explored currently, both in...

/pdf/additive-manufacturing-of-concrete-in-construction-42t6jdajwr.pdf

Additive manufacturing of concrete in construction: potentials and challenges of 3D concrete printing

Although the use of Fibre Reinforced Concrete (FRC) for structural applications is continuously increasing, it is still limited with respect to its potentials, mainly due to the lack of International Building Codes for FRC structural elements. Within fib (Federation Internationale du Beton), the Special Activity Group 5 is preparing a New fib Model Code that aims to update the previous CEB-FIP Model Code 90, published in 1993, that can be considered as the reference document for Eurocode 2. The New Model Code includes several innovations and addresses among other topics, new materials for structural design. In this respect, FRC will be introduced. The Technical Groups fib TG 8.3 “Fibre reinforced concrete” and fib TG 8.6 “Ultra high performance FRC” are preparing some sections of the New Model Code, including regular and high performance FRC. This paper aims to briefly explain the main concepts behind the structural rules for FRC structural design.

Fibre reinforced concrete: new design perspectives

Structural performance of ultra-high-performance concrete beams with different steel fibers

Effects of fiber shape, aspect ratio, and volume fraction on flexural behavior of ultra-high-performance fiber-reinforced cement composites

Fibre distribution and orientation in a series of round panel specimens of ultra high performance fibre reinforced concrete (UHPFRC) was investigated using electrical resistivity measurements and confirmed by X-ray CT imaging. By pouring specimens in different ways, the orientation of steel fibres was influenced and the sensitivity of the electrical resistivity technique was investigated. The round panels were tested in flexure and the results are discussed in relation to the observed orientation of fibres in the panels. It was found that the fibres tended to align perpendicular to the direction of flow. As a result, panels poured from the centre were significantly stronger than panels poured by other methods because the alignment of fibres led to more fibres bridging the radial cracks formed during mechanical testing.

Assessment of fibre orientation in ultra high performance fibre reinforced concrete and its effect on flexural strength

Betoni vrlo visokih svojstava armirani vlknima su gradiva sa cementnom matricom i karakteristicnom tlacnom cvrstocom vecom od 150 MPa, s mogucim dosegom do 250 MPa, koja sadržavaju celicna vlakna da bi se postiglo duktilno ponasanje pod djelovanjem vlaka, i, ako je moguce, izbjegla uporaba pasivne armature.

Ultra High Performance Fibre-Reinforced Concretes-Interim Recommendations

The bridge across the sea strait between the mainland and the Peljesac peninsula is to be built to establish the fixed road link between parts of Croatian territory, thus facilitating the development of Dubrovnik and all of the southern Croatia. Extensive offshore site investigations were carried out, including continuous shear wave survey and geotechnical explorations from a specially equipped drill ship, to obtain soil parameters for the design of bridge foundations. A site-specific seismic study was undertaken based on the seismic source zone characterization and attenuation relationships for the south of Croatia. Over ten different bridge types, including beams, trusses, arches and a cablestayed bridge, were investigated in the preliminary design and two of them, a steel box type beam and a cable stayed bridge over the navigation channel were proposed for the next design phase. The finally chosen solution is a continuous steel box type superstructure bridge of uniform depth, supported by concrete piers and abutments on deep tubular steel driven piles foundations.

Overview of Pelješac bridge design

The most complex problem in a cantilever bridge analysis is the calculation of deflection and defining the structure precamber. It has not been fully examined yet what altogether, in what way and in what amount has an impact on deflection. But, it is a fact that a big difference between calculated and subsequently measured deflections has been observed on the majority of such bridges constructed. In the paper, an analysis of causes of large deformation developments is made and the experiences and proposals for the design and calculation of such bridges are presented.

A new approach to deflection analysis of cantilever beam bridges

True reinforced concrete arches are discussed from the aspects of the structural materials, the structural system, the shape of the arch, and construction methods. Four large concrete arch bridges were built on the Adriatic Sea coast in Croatia from 1965 to 1980. The degradation of those bridges and their maintenance problems are discussed. The designs for two new large arch bridges are presented. The shapes of the arches were designed so that the bending moments under permanent actions would be minimized. This was done by the use of a computer program developed for the purpose.

New Contribution to Concrete Arch Bridge Construction

Original scientific paper Long-term deformations on cantilever girder bridges Long term deformations are a crucial problem on reinforced-concrete cantilever girder bridges. In fact, a great difference has been revealed between the calculated and subsequently measured deflection values on most of such bridges built over the past fifty years. It is still not clearly understood what parameters trigger such deflections. The analysis of data from a number of bridges realized all over the world is given, and possible reasons for great deformations and poor correspondence with design values, are presented.

/pdf/dugotrajne-deformacije-konzolno-gradenih-grednih-mostova-3iqm779zsh.pdf

Dugotrajne deformacije konzolno građenih grednih mostova

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