Damping in vibrating structures is much less understood than their stiffness and inertial properties and in timber structures it is even less understood how damping is generated in motion ...characteristic of bending and shear separately. We analyse these contributions through application of the so-called method of complex moduli, arising in constant-hysteretic models of damping. We separate the influences on overall damping due to these independent material properties by considering a partial differential equation of undamped motion and substituting Young's and shear moduli with their complex counterparts. We keep the rotary inertia present in the model to assess its own damping contribution and design an experimental setup in which vibration of a free-free beam is simulated so that no reaction (i.e., no contact damping) should be present, which allows us to assess the contribution due to bending, shear and rotary inertia to material damping only. We show that, in the present model, the overall loss factor is indeed smaller than in the literature, while the damping due to shear effects grows in higher vibration modes and beams with smaller length-to-height ratio. Finally, we propose a damping prediction model built on simple linear regression in which the vibration modes are processed separately.
The proclamation of Rijeka as a free port in 1719, and the construction of the lazaretto (naval quarantine station) of St Charles Borromeo in 1725, initiated the economic and urban development of ...Rijeka, which grew from a small coastal town into a significant centre of manufacturing and industry. With the lazaretto and the largest factory, a sugar refinery built in 1750, the city's first manufacturing zone was formed. In the second zone, along the Rječina River, in 1821 a paper mill was built, which in 1833 received the first steam engine, with which the industrialisation of the city began. This article describes the materials and structures of the industrial buildings that characterise this period. In proto-industrial and early industrial times, construction consisted mainly of massive stone and brick walls or masonry-vaulted structures. In the 19th century, buildings begin to adapt to the production processes, which influenced the development of a new architectural typology. The internal structures were made of wood, a readily available and inexpensive material, with which the builders already had extensive experience.
Celotno besedilo
Dostopno za:
BFBNIB, DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, UILJ, UKNU, UL, UM, UPUK
The article describes the use of iron in industrial buildings constructed in the first industrial age in Rijeka. Since the middle of the 19th century, the structural use of cast iron in internal ...skeleton structures in place of timber created opportunities for improved functional design of these multi-storey buildings. The analysis of some buildings indicates a lack of experience in the application of new structural typologies, while in others it indicates experimental and innovative structural solutions which reflected the progress of science, technology and high-quality workmanship in that period.
Celotno besedilo
Dostopno za:
BFBNIB, DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, UILJ, UKNU, UL, UM, UPUK
Na primjeru projekta izvedene staklene stijene ovješene na prednapetim vertikalnim kablovima, u radu su kratko opisane njihove konstrukcijske značajke, a detaljnije razrađena načela proračuna. ...Uspoređeni su rezultati primjene dvaju pristupa u modeliranju: integralnog, koji uključuje i glavnu nosivu konstrukcije te interakciju u zonama oslonaca ostakljenja, te pojednostavnjenog, sa sekvencijalno modeliranim kablovima i simulacijom interakcije s glavnom konstrukcijom oprugama zamjenskih krutosti u točkama sidrenja kablova. Analizirane su prednosti, razlozi i posljedice primjene modela na ponašanje staklene stijene i cjelovite konstrukcije.
Structural design of cable net wall (CNW) with vertically pretensioned cables is used to give brief overview of basic structural performances of these façades and to elaborate the methodological specifies of their design. We compared results of the two applied approaches in modelling: the integral model with main load-bearing structure included, taking into account real interaction at zones of glazing supports; the simplified model with sequentially modelled cable, and springs of adequate stiffness, placed at points of cable anchorages, as simulation of interaction. Benefits, prerequisites for the application of these models and consequences they make on behaviour of glass façade and entire structural system were analysed.
In memoriam prof. dr. sc. Darko Meštrović Adriana Bjelanović; Ivana Štimac Grandić
Zbornik radova (Građevinski fakultet u Rijeci. Online),
12/2022, Letnik:
25, Številka:
1
Journal Article
PDF