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Prof. Vlatka Rajčić
University of Zagreb, Faculty of Civil Engineering, Head of Structural department, Street: Fra Andrije Kacica-Miosica 26, 10000 Zagreb, Croatia

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Research Keywords & Expertise

0 Structural Health Monitoring
0 Timber Structures
0 Protection of cultural heritage
0 Nondestructive methods of structural element assessment
0 Rehabilitation and reconstruction of cultural heritage objects

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Journal article
Published: 29 May 2021 in Forests
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The TCC concept has been studied and developed over the past decades. The variety of solutions shows the meaningfulness and functionality of this system, as well as the continuous work of scientists over time. To benefit from these advantages, the composite needs to provide sufficient stiffness to meet the serviceability criteria and load capacity to resist loading at every stage of the building life. An example of connector types and load slip curves according to EN 1995 is given. This paper discusses possible limitations related to residential areas, and additionally, the possible solutions that EN 1995 does not discuss in the case of resonant response (f1< 8 Hz). The theoretical studies were accompanied by numerical analyses considering certain simplifications suitable for practical use.

ACS Style

Nikola Perković; Vlatka Rajčić; Jure Barbalić. Analytical and Numerical Verification of Vibration Design in Timber Concrete Composite Floors. Forests 2021, 12, 707 .

AMA Style

Nikola Perković, Vlatka Rajčić, Jure Barbalić. Analytical and Numerical Verification of Vibration Design in Timber Concrete Composite Floors. Forests. 2021; 12 (6):707.

Chicago/Turabian Style

Nikola Perković; Vlatka Rajčić; Jure Barbalić. 2021. "Analytical and Numerical Verification of Vibration Design in Timber Concrete Composite Floors." Forests 12, no. 6: 707.

Journal article
Published: 17 March 2021 in Applied Sciences
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Bonded-in rods (BiR) represent a structural connection type that is largely used for new timber structures and rehabilitation (repair or reinforcement) of existing structural members. The technology is based on steel / Fiber Reinforced Polymer (FRP) / Glass Fiber Reinforced Polymer (GFRP) rods bonded into predrilled holes in timber elements. The mechanical advantages of BiRs include high local force capacity, improved strength, a relatively high stiffness and the possibility of ductile behaviour. They also offer aesthetic benefits, given that rods are hidden in the cross sections of wooden members. As such, BiR connections are regarded as a solution with great potential, but still uncertain design formulations. Several research projects have dealt with BiRs, but a final definition of their mechanics and a universal design procedure is still missing. This research study explores the typical fracture mechanics modes for BiR connections. A special focus is given to the evaluation of the impact of adhesive bonds under various operational conditions (i.e., moisture content of timber). A total of 84 specimens are tested in pull-out setup, and investigated with the support of digital image correlation (DIC). The reliability of empirical equations and a newly developed analytical model in support of design, based on linear elastic fracture mechanics (LEFM), is also assessed.

ACS Style

Jure Barbalić; Vlatka Rajčić; Chiara Bedon; Michal Budzik. Short-Term Analysis of Adhesive Types and Bonding Mistakes on Bonded-in-Rod (BiR) Connections for Timber Structures. Applied Sciences 2021, 11, 2665 .

AMA Style

Jure Barbalić, Vlatka Rajčić, Chiara Bedon, Michal Budzik. Short-Term Analysis of Adhesive Types and Bonding Mistakes on Bonded-in-Rod (BiR) Connections for Timber Structures. Applied Sciences. 2021; 11 (6):2665.

Chicago/Turabian Style

Jure Barbalić; Vlatka Rajčić; Chiara Bedon; Michal Budzik. 2021. "Short-Term Analysis of Adhesive Types and Bonding Mistakes on Bonded-in-Rod (BiR) Connections for Timber Structures." Applied Sciences 11, no. 6: 2665.

Preprint
Published: 27 April 2020
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Façade elements are a building component that satisfies multiple performance parameters. Among other things, “advanced façades” take advantage of hybrid solutions, such as assembling laminated materials. In addition to the enhanced mechanical properties that are typical of optimally composed hybrid structural components, these systems are energy-efficient, durable, and offer lighting comfort and optimal thermal performance, an example of which is the structural solution developed in collaboration with the University of Zagreb and the University of Ljubljana within the Croatian Science Foundation VETROLIGNUM project. The design concept involves the mechanical interaction of timber and glass load-bearing members without sealing or bonding the glass-to-timber surfaces. Following earlier research efforts devoted to the structural analysis and optimization of thus-assembled hybrid Cross-Laminated Timber (CLT)-glass façade elements, in this paper, special focus is given to a thermal and energy performance investigation under ordinary operational conditions. A simplified numerical model representative of a full-size building is first presented by taking advantage of continuous ambient records from a Live-Lab mock-up facility in Zagreb. Afterwards, a more detailed Finite Element (FE) numerical analysis is carried out at the component level to further explore the potential of CLT–glass façade elements. The collected numerical results show that CLT–glass composite panels can offer stable and promising thermal performance for façades similar to national and European standard requirements.

ACS Style

Vlatka Rajčić. Thermal and Energy-Efficiency Assessment of Hybrid CLT–glass Façade Elements. 2020, 1 .

AMA Style

Vlatka Rajčić. Thermal and Energy-Efficiency Assessment of Hybrid CLT–glass Façade Elements. . 2020; ():1.

Chicago/Turabian Style

Vlatka Rajčić. 2020. "Thermal and Energy-Efficiency Assessment of Hybrid CLT–glass Façade Elements." , no. : 1.

Review
Published: 19 February 2020 in Applied Sciences
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Use of timber as a construction material has entered a period of renaissance since the development of high-performance engineered wood products, enabling larger and taller buildings to be built. In addition, due to substantial contribution of the building sector to global energy use, greenhouse gas emissions and waste production, sustainable solutions are needed, for which timber has shown a great potential as a sustainable, resilient and renewable building alternative, not only for single family homes but also for mid-rise and high-rise buildings. Both recent technological developments in timber engineering and exponentially increased use of engineered wood products and wood composites reflect in deficiency of current timber codes and standards. This paper presents an overview of some of the current challenges and emerging trends in the field of seismic design of timber buildings. Currently existing building codes and the development of new generation of European building codes are presented. Ongoing studies on a variety topics within seismic timber engineering are presented, including tall timber and hybrid buildings, composites with timber and seismic retrofitting with timber. Crucial challenges, key research needs and opportunities are addressed and critically discussed.

ACS Style

Mislav Stepinac; Iztok Šušteršič; Igor Gavrić; Vlatka Rajčić. Seismic Design of Timber Buildings: Highlighted Challenges and Future Trends. Applied Sciences 2020, 10, 1380 .

AMA Style

Mislav Stepinac, Iztok Šušteršič, Igor Gavrić, Vlatka Rajčić. Seismic Design of Timber Buildings: Highlighted Challenges and Future Trends. Applied Sciences. 2020; 10 (4):1380.

Chicago/Turabian Style

Mislav Stepinac; Iztok Šušteršič; Igor Gavrić; Vlatka Rajčić. 2020. "Seismic Design of Timber Buildings: Highlighted Challenges and Future Trends." Applied Sciences 10, no. 4: 1380.