G. Lengyel

Budapest University of Technology and Economics · Department of Structural Mechanics

Historically, the first groin vaults were built without ribs, but ribs later appeared for various reasons. Some ribs have only an aesthetic role, while others have a clear structural role in stiffening the groin. The stiffening effect on the static behavior is currently of wide interest, as the preservation of architectural heritage has become impo...

The paper investigates the energy- and amplitude-dependent natural periods of symmetrically cracked semi-circular arches, which are loaded by their self-weight and horizontal support displacement. The cracks appear due to previous static effects. Symmetric free vibration of the arches is under analysis. The symmetry condition results in an SDoF sys...

The paper investigates how the shape affects the Couplet–Heyman minimum thickness of the masonry pointed arch. The minimum thickness is such a structural thickness, at which a vault made of rigid voussoirs is stable for self-weight. It is expressed as a function of the pointed generator curve’s deviation from the semicircle. The arch is analysed in...

The paper investigates the natural periods of symmetrically cracked semi-circular masonry arches. The cracks are present due to previous actions, additionally new cracks do not appear and the depth of the cracks do not change during motion, which assumptions are acceptable, if the amplitude of the vibration is relatively small. During vibration the...

The paper investigates how the deviation of the centreline from the semi-circle influences the mechanical behaviour of gothic masonry vaults. The geometry of the vaults is quantified by a scalar parameter. The present work deals with the force-transmitting system, crack opening magnitude and pattern. Furthermore, the magnitude of the so-called thre...

In this work the dynamical analysis of a pre-stressed continuous rod with one crack at the end is carried out. This kind of behaviour is typical for masonry and concrete structures, which have low tensional resistance. An initial crack is assumed at the end of the bar. The longitudinal vibration in this structure will be performed with the modal an...

The magnitude of horizontal reactions under self-weight are analysed for pointed barrel vaults with different eccentricities. The magnitude is expressed as the function of the eccentricity (deviation of the pointed generator curve from the circle). Vaults with fixed supports and with increasing outwards support displacements are considered. An anal...

The role of ribs in the mechanical behavior of masonry cross vaults has been the subject of intense debates since the 19th century. Literature on the subject diverges from considering the ribs as the main load-bearing units which carry the weight of the masonry web, to the opinion that the ribs are merely decorations. This research focused on the s...

Munkánkban a csak nyomásnak ellenálló anyagú húzott-nyomott rúd diszkrét modelljének dinamikai vizsgálatát végezzük el. Ilyen anyagként modellezhető például a beton, vagy a falazott szerkezetek, melyek húzószilárdsága jóval alacsonyabb, mint a nyomószilárdsága. Ezen anyagok folytonossága már alacsony húzóerő hatására megszűnik, repedések jelennek m...

Magnetic Levitation (MAGLEV) based high-speed trains are one of the most promising means of transport for the near future. In order to optimize the relatively high investment cost of these networks, engineers need to develop accurate dynamical simulations of the whole complex MAGLEV system. It involves the proper consideration of the interactions b...