Jaime Mata Falcón

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Mata Falcón

First Name

Jaime

ORCID

0000-0001-8701-4410

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Publications 1 - 10 of 85

Fundamental Studies on the Use of Distributed Fibre Optical Sensing on Concrete and Reinforcing Bars
Galkovski, Tena; Lemcherreq, Yasmin; Mata Falcón, Jaime; et al. (2021)
Sensors ~ Distributed Optical Fiber Sensors for Concrete Structure Monitoring
Distributed fibre optical sensing (DFOS) allows for quasi-continuous strain measurement in a broad range of gauge lengths and measurement frequencies. In particular, Rayleigh backscatter-based coherent optical frequency domain reflectometry has recently registered a significant application increase in structural concrete research and monitoring thanks to its numerous merits, such as high resolution and low invasiveness. However, it is not a plug-and-play technique. The quality of the acquired data depends highly on the choice of the fibre optical sensor and the methods of instrumentation and post-processing. Furthermore, its unprecedented resolution and sensitivity allow capturing local effects not well documented so far. This paper analyses the suitability of DFOS based on Rayleigh backscatter for reliably measuring strains and discusses the origin and structural relevance of local variations in the results. A series of experimental investigations are presented, comprising tensile tests on bare reinforcing bars and concrete compression tests. A critical analysis of the results leads to a best practice for applying DFOS to reinforcing bars and concrete, which establishes a basis for reliable, accurate measurements in structural concrete applications with bonded reinforcement.
Experimental research on reinforced concrete dapped-end beams: shear strength and serviceability behaviour
Mata Falcón, Jaime; Pallarés Rubio, Luis; Miguel Sosa, Pedro (2012)
Proceedings of the 9th fib International PhD Symposium in Civil Engineering
Crack widths in structural concrete subjected to in-plane loading
Kaufmann, Walter; Mata Falcón, Jaime (2017)
Crack Width Calculation Methods for Large Concrete Structures. Workshop Proceedings No. 12
Interlayer Reinforcement for Digitally Fabricated Concrete Structures
Mata Falcón, Jaime; Gebhard, Lukas; Kaufmann, Walter (2021)
Design and fabrication of optimised ribbed concrete floor slabs using large scale 3D printed formwork
Burger, Joris Jan; Huber, Tobias; Lloret-Fritschi, Ena; et al. (2022)
Automation in Construction
This paper describes the design, fabrication, and testing process of an optimised, reinforced concrete ribbed floor slab fabricated using robotically 3D printed formwork. The design of the floor slab is based on the alignment of ribs along the trajectories of the principal bending moments. A workflow is described that generates a rib layout based on structural analysis, which is used to create a three-dimensional model of the slab. A full-scale prototype is fabricated by using an industrial robotic arm with a pellet extruder mounted as an end effector to 3D print the formwork. Reinforcement is inserted and the formwork is cast using self-compacting concrete. The successful design, fabrication, and structural testing of the full-scale floor slab prototype showed that the described workflow is suitable for realizing material-optimised, ribbed reinforced concrete floor slabs using 3D printed formwork.
Design and Fabrication of a Non-standard, Structural Concrete Column Using Eggshell: Ultra-Thin, 3D Printed Formwork
Burger, Joris Jan; Lloret-Fritschi, Ena; Taha, Nizar; et al. (2020)
RILEM Bookseries ~ Second RILEM International Conference on Concrete and Digital Fabrication
This paper describes the design and fabrication process of a concrete column cast in ultra-thin, 3D printed formwork, using a process known as Eggshell. The column was prefabricated as part of a real-world construction project, serving as the main load-bearing element for a reciprocal timber frame structure. The fabrication of the column required upscaling of the Eggshell process, to allow for the fabrication of elements of an architectural scale. Furthermore, several challenges had to be addressed such as: integration of reinforcement, establishing the formwork design space, and scaling up the 3D printing process. For the production of the final column a 1.5 mm thin formwork was 3D printed, after which it was combined with a prefabricated reinforcement cage and filled with concrete in a set-on-demand casting process. The successful realization of the project provides a first example of a full-scale building element produced with the Eggshell fabrication process. By 3D printing the formwork, geometrical freedom in concrete construction is greatly expanded, as well as formwork waste reduced.
Towards efficient concrete structures with ultra-thin 3D printed formwork: exploring reinforcement strategies and optimisation
Gebhard, Lukas; Burger, Joris Jan; Mata Falcón, Jaime; et al. (2022)
Virtual and Physical Prototyping
The Eggshell fabrication process combines the 3D printing of formwork with the simultaneous casting of a fast-hardening concrete. One limiting factor to reaching mass-market adoption is a suitable reinforcing strategy. In this study, a reinforcement strategy combining steel reinforcing bars with steel fibres is explored. A series of eight beams were produced using the Eggshell process or conventionally cast. The longitudinal reinforcement was provided by two reinforcing bars, and two types of fibres, either mixed with the concrete or placed and aligned between the cast concrete layers, were used as shear reinforcement. The results showed that combining conventional longitudinal reinforcement and fibres as shear reinforcement is a suitable strategy. These findings were applied to fabricate an optimised beam with a volume reduction of almost 50%. The structural performance of this beam was similar to the beam with a rectangular crosssection with the same reinforcement strategy showing the potential of Eggshell in combination with an innovative reinforcement strategy to produce material-efficient structural concrete elements.
New structural engineering possibilities of digital fabrication towards leaner concrete structures
Mata Falcón, Jaime; Lee, Minu; Gebhard, Lukas; et al. (2022)
The design possibilities of concrete structures are typically tightly constrained by the high costs and material waste of formworks and reinforcement for producing non-conventional shapes. Digital fabrication technologies aim at producing structures with increased degrees of geometrical freedom at little extra cost and avoiding material waste. This might allow (i) revisiting abandoned structural typologies (e.g. shells, folded roofs, ribbed or mushroom slabs) and (ii) exploring new concepts towards leaner construction. In this lunch talk, researchers from the Group of Concrete Structures and Bridge design at ETH Zurich will present recent structural engineering developments within the domain of Digital Fabrication with Concrete, making use of technologies such as 3D concrete printing, knitted textile reinforcement, robotic reinforcement assemblies and 3D formwork printing.
Design and assessment with strut-and-tie models and stress fields: from simple calculations to detailed numerical analysis
Haugerud, Stein Atle; Blaauwendraad, Johan; Bousias, Stathis; et al. (2021)
fib Bulletin
Following the long-standing tradition of fib in promoting the use of consistent design methods, strut-and-tie models were formally incorporated in Model Code 1990 to serve as the design basis for discontinuity regions. This choice was largely acknowledged as a sound approach for design and was thereafter followed in many national standards. For Model Code 2010, some update and revision of the previous provisions was performed, but the scope of the method was particularly broadened by introducing its complementary use with the stress field method. Since Model Code 2010, significant new knowledge has been generated in this topic. Particularly, the use of software implementing the theoretical ground of the stress field method is becoming increasingly popular and efficient, allowing for design, optimisation and assessment of structures in a simple, transparent and accessible manner. In this Bulletin, the current state-of-the-art of the strut-and-tie models (STM) and the stress field models (SFM) is presented. Reference is not only made to classical rigid-plastic solutions, but also to solutions considering compatibility of deformations, such as elastic-plastic approaches or models allowing investigation of serviceability behaviour and deformation capacity of concrete structures. It is shown in the Bulletin that all models share the same ground and fundamental hypotheses. Their results are presented in a unitary and consistent manner by means of compression fields in the concrete and stresses in the reinforcement. The consistency amongst these approaches and their potential use in practice is also explored by means of the Levels-of-Approximation (LoA) approach as described in Model Code 2010. Another effort in this Bulletin has been devoted to provide comparisons of the solutions according to strut-and-tie and stress fields to tests, in order to discuss on their pertinence and limitations. This perspective is also completed with practical examples presented of structures actually designed with this technique and where the potential of these methods can be appreciated in a clear manner. Finally, a number of special topics are also covered in the Bulletin, related to numerical optimisation, verifications at serviceability states, minimum reinforcement or the applicability of the methods under cyclic or reversal actions. This Bulletin not only aims to give state-of-the-art rules and methods to design according to these techniques, but also to provide an outlook of how these methods could be implemented in future standards. This material also serves as the background document for the revision of the current provisions of Model Code 2010 in the new Model Code 2020.
Inter-laboratory study on the influence of 3D concrete printing set-ups on the bond behaviour of various reinforcements
Gebhard, Lukas; Esposito, Laura; Menna, Costantino; et al. (2022)
Cement and Concrete Composites
This study investigates the influence of different printing set-ups and materials on the bond strength of reinforcement manually placed between 3D printed concrete layers. An identical experimental campaign was performed at two institutes in Switzerland and Italy. Each institute used its own printing process, which consisted either of a set on-demand mix or a high yield stress material. Two types of reinforcement (reinforcing bar Ø8 mm and a high strength steel wire Ø1 mm) and three production configurations (casting and printing with the reinforcement parallel or perpendicular to the printing direction) were investigated. The results showed high bond strength with only a limited influence of the fabrication method for the reinforcing bars. An increased bond was observed for the set on-demand approach compared to the high yield strength material. The comparison with existing models showed that the reinforcing bar bond strength of printed concrete varies slightly from conventional concrete. The high strength wires exhibited poor bond. Based on the gathered experiences, insights into the standardisation of testing for 3D concrete printing are discussed.

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Jaime Mata Falcón

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