Anđelko Vlašić

University of Zagreb · Department of Structures

For wide flange box sections, conventional Euler–Bernoulli beam theory with maintaining the cross-section planarity may lead to underestimation of axial stresses. Axial stresses in cross-section flanges may have a non-uniform distribution due to shear pliability, decreasing in value from the flange–web junction to the middle area of the flange. Thi...

Limiting the crack width in reinforced concrete structures is essential to ensure a durable structure as it prevents accelerated corrosion of the reinforcement. For composite bridges, Eurocode HRN EN 1994-2 defines a very strict condition of a maximum crack width of 0.15-0.2 mm, which must be met for frequent combinations of actions. Since cracks i...

The basis for decisions on the maintenance and management of bridges are reports on the main visual inspection, which are carried out regularly every six years. However, some damage in early phase and/or internal structural defects cannot be detected by a visual inspection but require additional testing and monitoring of the structural condition. T...

In today’s world, concrete structures are exposed to various influences, including explosive actions. With the increasing use of fiber-reinforced concrete (FRC), it is essential to investigate its response to blast effects. As there are few studies on this topic worldwide, this research is dedicated to the question of how blast effects affect the d...

The seismic design of reinforced concrete walls is greatly influenced by the selected ductility class. The ductility class directly determines the reduction of seismic loading by reducing the response spectrum using an appropriate behaviour factor. A higher ductility class can only be achieved by following more stringent design rules related to the...

According to Eurocode HRN EN 1991-2 and Croatian National Annex HRN EN 1991-2/NA highway and expressway bridges need to be designed for Load Model 1 (heavy vehicles) and Load Model 3 (special vehicles) traffic loads. Classes of special vehicles are defined in Annex A of HRN EN 1991-2, while the Croatian National Annex requires the use of 15 axle sp...

Seismic assessment and subsequent retrofitting of existing road bridges is a growing challenge for structural engineers in earthquake-prone areas. Following the two catastrophic earthquakes which occurred in the last two years in Croatia, the awareness (both from the engineers and public) for older existing road bridges is heightened. As they were...

The load-carrying capacity assessment of existing road bridges, is a growing challenge for civil engineers worldwide due to the age and condition of these critical parts of the infrastructure network. The critical loading event for road bridges is the live load; however, in earthquake-prone areas bridges generally require an additional seismic eval...

In December 2020, a strong earthquake occurred in Northwestern Croatia with a magnitude of ML = 6.3. The epicenter of this earthquake was located in the town of Petrinja, about 50 km from Zagreb, and caused severe structural damage throughout Sisak-Moslavina county. One of the biggest problems after this earthquake was the structural condition of t...

In seismically active areas, knowledge of the actual behavior of bridges under seismic load is extremely important, as they are crucial elements of the transport infrastructure. To assess their seismic resistance, it is necessary to know the key indicators of their seismic response. Bridges built before the adoption of standards for seismic detaili...

Horizontal loads such as earthquake and wind are considered dominant loads for the design of tall buildings. One of the most efficient structural systems in this regard is the tube structural system. Even though such systems have a high resistance when it comes to horizontal loads, the shear lag effect that is characterized by an incomplete and une...

Concrete damage (cracks, voids and delamination) significantly influence initiation and propagation phase of reinforcement corrosion. The three methods are combined in the framework of this research: (i) on-site testing on concrete bridges, (ii) application of an advanced numerical model for service life prediction on existing structures and (iii)...

Assessment of reinforcement corrosion and concrete damage on bridges using non-destructive testing Management of bridges in Croatia and their vulnerability to reinforcement corrosion is discussed in the paper. New maintenance approach, where visual inspections are combined with the non-destructive testing methods, is proposed and demonstrated on si...

Existing bridge maintenance policy, where bridge assessment is based on results of visual inspection is not sufficient since reinforcement corrosion, as the main degradation process of concrete bridges, cannot be timely detected. Hence, new approach, where visual inspection is combined with simple, rapid and cost-effective non-destructive testing (...

p>Paper reports findings from parametric analysis of open section constant height composite bridges with considered spans ranging from 20 to 70 m (for larger spans closed box girder section is recommended). For these spans, girder structural system is analyzed for permanent and traffic loads, and thus steel quantity determined according to Eurocode...

The idea behind choosing design of a diagrid structural system in a high rise building as the thesis is the effectivness and uniqueness, despite its complexity. It is a system that combines high structural efficiency and great aesthetic value. Diagrid system forms a grid of diagonal elements on the outside perimeter of the building. Diagonalized ap...

The research topic for this thesis is the comparative analysis of different variants in placing the outrigger trusses throughout the height of the building and how this placement and their number effect the behaviour of the building itself. The main purpose of the outriggers is the reduction of the overturning moment in the core of the building, so...

Due to bending, flanges of steel box girder cross sections act as compression plates and require stiffeners. Using stability evidence from EN 1993-1-5, a parametric study was performed for six different types of stiffeners. The obtained diagrams show design buckling resistance stress for various plate width and thickness values, and the type and nu...

New Zagreb airport terminal is currently being built following the winning design from an international competition called upon by Zagreb City in 2008. After some pause, the project was rebooted in 2012, when Croatian government signed a concessionary agreement with French company Bouygues for the erection of the terminal according to the winning d...

The design of the new airport terminal by Branko Kincl, Velimir Neidhardt and Jure Radić was awarded a first prize following an international competition organised by the City of Zagreb in 2008. The airport design comprises an multidimensional approach integrating construction, form, urbanism, ecology and functionality. An important part of the ter...

Na međunarodnom natječaju koji je raspisala Zračna luka Zagreb pobijedilo je rješenje autora s Arhitektonskog i Građevinskog fakulteta Sveučilišta u Zagrebu. Konstrukcija i oblik rješenja zajedno su integrirani višedimenzionalnim pristupom u kojem niti jedan od čimbenika - urbanizam, ekologija, arhitektura, konstrukcija, funkcionalnost, promet - ni...

A single span bridge should be designed to cross the Bakar Strait on the state road between Rijeka and Senj. Solid rock terrain and deep cliffs are especially suitable for an arch bridge. Traditionally, concrete arch bridges are long present on Croatian coastline, so an attempt is to be made for such a bridge. A few alternative solutions of a concr...

Charts for the bending moments in the closed rib orthotropic deck plate are derived, based on the method originally introduced by Pelikan and Esslinger. New charts are done for EN 1991-2 traffic load distribution schemes. The governing Huber plate equation is solved utilizing Fourier series for various bridge deck plate boundary conditions. Bending...

Authors present a new artificial-intelligence method called the support vector method The method is used in the classification of samples and for regression analysis. The,set of data defining rigidity parameters for cable stay bridges has been selected as an example. When used in the scope of this method, the mentioned data enable estimation of cab...

Authors present a new artificial-intelligence method called the support vector method. The method is used in the classification of samples and for regression analysis. The set of data defining rigidity parameters for cable stay bridges has been selected as an example. When used in the scope of this method, the mentioned data enable estimation of ca...

A single span bridge should be designed to cross the Bakar Strait on the state road between Rijeka and Senj. Solid rock terrain and deep cliffs are especially suitable for an arch bridge. Traditionally, concrete arch bridges are long present on Croatian coastline, so an attempt is to be made for such a bridge. A few alternative solutions of a concr...