György Farkas

Budapest University of Technology and Economics

The present chapter intends to include the following aspects for reinforced and prestressed concrete bridges: material specifications (US and European standards); different types of cast-in-situ or precast bridge decks like solid or voided slabs; beams; reinforcing and prestressing systems; details; losses and time-dependent effects in prestressing...

In this article the primary segment of an antiprismatic pop-up mast is analyzed, that can be applied for largely flexible architectural designs, like deployable bridges or transportable look-out towers. This deployable column, consisting of rigid plates, rigid and elastic bars, is characterized by its selfdeploying behavior due to the energy accumu...

Part I of this paper introduces an experimental program carried out on RC members with thick walled hollow circular cross-section to study their behaviour under combined bending and shear. Ultimate resistance and propagation of characteristic crack pattern, as well as shape and behaviour of the failure sections as function of the wall thickness, th...

Polymer concrete, a composite material in which the binding material is some type of polymer, is being used more widely in the construction industry. Polymer concretes can also contain steel reinforcing rebars; therefore, the rate of adhesion between polymer concrete and reinforcing steel must be determined. Our study investigated the extent and be...

This paper deals with the axial folding of an antiprismatic self-deployable mast rendered packable by stretchable hoop strut circles. The main novelty pertains to an interesting kinematic-mechanical softening phenomena, related to the serial connection of packable segments. The softening in this case occurs as the consequence of geometric instabili...

This paper focuses on scissor like deployable/retractable structures that can be used for civil engineering and architectural applications. A general outline of deployable structures is given through the principals of different succeeded examples, namely manually locking deployable structures stabilized by cables, self-locking deployable systems an...

The aim of the research was to determine the relationship between the Schmidt N rebound index and the compressive strength of spun-cast concrete elements with low water-cement (w/c) ratio. In the research 22 specimens of 8 different mixtures were tested. The investigated mixture parameters included w/c ratio, compaction intensity and type of aggreg...

The aim of the research was to characterize the concrete mixtures for spun-cast concrete and to determine the relationship between the compacting ratio and the manner of segregation. In the research 23 specimens of 9 different mixtures with low w/c ratio were tested. Investigated parameters included w/c, spinning speed, duration, and properties of...

The paper deals with the assessment of damage in a lightly reinforced concrete beam using the measured values of the first natural frequency. The aim of the presented laboratory experiment was the experimental investigation of the relationship between the degree of cracking and the first natural frequency under defined deterioration conditions. As...

Three different calculation methods regarding the static analysis of reinforced concrete (RC) frame buildings have been compared to each other. The differences between the results coming from the different models were evaluated and summarized. Typical problem is the application of prestressed concrete (PC) columns in RC industrial halls. Therefore...

This paper is primarily focused upon the use of carbon fibres and fabrics, which is consisted of a composite of epoxy polymeric resin matrix reinforced by carbon fibres on different RC structures. In this paper we focus primarily on the modelling of concrete columns confined by carbon fibre cloth.The results of the validation process of a confineme...

The paper deals with the assessment of damage in a lightly reinforced concrete beam using the measured values of the first natural frequency. The aim of the presented laboratory experiment was the experimental investigation of the relationship between the degree of cracking and the first natural frequency under defined deterioration conditions. As...

This paper deals with the circumstances of application of high-strength concrete in the Hungarian bridge construction industry in the mirror of adopting the Eurocode series. As a historical background, first a comparison has been carried out analysing the safety level of concrete bridge structures designed according to the Hungarian codes through t...

Considering that the volume of road transport has multiplied in the course of the past few years, the maintenance of more than the 5700 road bridges in Hungary is an actual problem with considerable technical and economical consequences. Therefore, the development of an adequate Bridge Management System (BMS) is a common interest.

A direct practical method is presented in this paper for determination of either the required area of the reinforcement or the ultimate critical load of reinforced concrete slender columns. This method is based on the determination of the point of intersection of two curves. The first is the M - N interaction diagram concerning the resistance of th...