Finite element model updating of Senyuva historical arch bridge using ambient vibration tests/Senyuva istorinio arkinio tilto baigtiniu elementu modelio atnaujinimas, taikant aplinkos sukeliamu virpesiu analize/Galigo elementu modela pilnveidosana Senyuvas vesturiskajam loka tiltam, izmantojot apkarejas vibraciju testus/Senyuva ajaloolise kaarsilla loplike elementide mudeli taiustamine kasutades umbritsevat vibratsioonikatset

This paper describes a historical arch bridge; its analytical modelling, modal testing and finite element model (FEM) updating. For this purpose, Senyuva historical arch bridge which is built in 1696 and located in Camlihemsin, Rize, Turkey, is selected as an application. 3D FEM of the bridge is modelled using ANSYS software to obtain analytical dynamic characteristics such as natural frequencies and mode shapes. Then, operational modal analysis using ambient vibrations is performed to attain dynamic characteristics experimentally. Human walking and wind are used as natural excitation. The output-only modal parameter identification is carried out using the Peak Picking method in frequency domain and the Stochastic Subspace Identification method in time domain. After, analytically and experimentally identified dynamic characteristics compared with each other and FEM of the historical bridge is updated to minimize the differences between modal parameters by changing uncertain modelling parameters such as boundary conditions. As a result, differences between the natural frequencies are reduced from 27% to 3% and good agreement is found between analytical and experimental dynamic characteristics after FEM updating. Keywords: ambient vibration, dynamic characteristics, finite element model (FEM) updating, historical arch bridge, modal testing, operational modal analysis. Siame darbe aprasytas istorinis arkinis tiltas, sio tilto analizinis modeliavimas, modaline analize ir baigtiniu elementu modelio (BEM) atnaujinimas. Tam tikslui pasirinktas istorinis Senyuva arkinis tiltas, pastatytas 1696 m. Turkijoje, Rize provincijos Camlihemsin miestelyje. Naudojant ENSYS programa sumodeliuotas trimatis baigtiniu elementu modelis, gauta analizine dinamine charakteristika. Eksperimentiniam dinamines charakteristikos nustatymui atlikta operacine modaline analize, naudojant aplinkos sukeliamus virpesius. Nustatyti modaliniai parametrai, taikant maksimaliu reiksmiu atrankos metoda (angl. Peak Picking Method) dazniu srityje ir tikimybini poerdvio nustatymo metoda (angl. Stochastic Subspace Identiication Method) laiko srityje. Tuomet palygintos analiziniu ir eksperimentiniu budu nustatytos dinamines charakteristikos, atnaujintas istorinio tilto baigtiniu elementu modelis. Atnaujinus baigtiniu elementu modeli, nustatytas geras suderinamumas tarp analiziniu ir eksperimentiniu dinaminiu charakteristiku. Reiksminiai zodziai: aplinkos virpesiai, dinamine charakteristika, baigtiniu el