3234 KB40 KB195120262025Čas, BojanČešarek, PeterStopar, Martinaštevilka:2letnik:75COBISSID:289406723URN:URN:NBN:SI:doc-08T3PKISslZveza društev gradbenih inženirjev in tehnikov SlovenijeGradbeni vestnikbrv Irča vasnatezni trakpešcitemperaturne spremembevibracijeVpliv temperature in dušenja na vibracije brvi z nosilnim sistemom nateznega traku| The influence of temperature and damping on the vibrations of a stress ribbon footbridge| case study of footbridge in Irča vas| študija primera brvi v Irči vasi|Stress ribbon bridges and footbridges are specific and technologically demanding structures which, due to their slenderness, are susceptible to vibrations resulting from dynamic excitation caused by pedestrian and runner activity. Their dynamic response is highly dependent on temperature changes that affect the stiffness of the structure, as well as on damping, which is difficult to estimate accurately in advance. This article examines the influence of temperature variations and damping on the vibrations of a stress ribbon footbridge and, consequently, on user comfort. The case study of these effects was conducted on the pedestrian and cyclist bridge over the Krka River in Irča vas near Novo mesto, which is the first and currently the only structure of this type in Slovenia. The article also presents a numerical model of the analysed footbridge, with its response compared to the measured static and dynamic response of the actual structure. Furthermore, the findings of extensive parametric dynamic analyses are presented, performed under varying temperature conditions and considering different ratios of critical dampingMostovi oz. brvi z nosilnim sistemom nateznega traku so specifične in tehnološko zahtevne konstrukcije, ki so zaradi svoje vitkosti dovzetne za vibracije, ki nastanejo kot posledica dinamičnega vzbujanja zaradi hoje in teka pešcev in tekačev. Njihov dinamični odziv je močno odvisen od temperaturnih sprememb, ki vplivajo na togost brvi, ter od dušenja, ki ga je vnaprej težko natančno oceniti. V prispevku predstavimo, kakšen vpliv imajo temperaturne spremembe in dušenje na vibracije brvi z nosilnim sistemom nateznega traku ter posledično na udobje uporabnikov. Preučevanje omenjenih vplivov smo izvedli na konkretni brvi za pešce in kolesarje čez reko Krko v Irči vasi pri Novem mestu, ki je prva in trenutno edina konstrukcija tega tipa v Sloveniji. V prispevku je predstavljen računski model obravnavane brvi, katerega odziv je primerjan z dejansko izmerjenim statičnim in dinamičnim odzivom brvi. Predstavljene so tudi ugotovitve obsežnih parametričnih dinamičnih analiz, ki so bile izvedene ob različnih temperaturnih pogojih in pri različnih deležih kritičnega dušenjaTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaZveza društev gradbenih inženirjev in tehnikov Slovenije