<p>Research on development of seismic assessment procedure for existing bridges will be presented in this paper. Both the linear response spectrum analysis and the nonlinear static pushover method are used and results were evaluated following the demands defined by current European seismic design codes. At first, this procedure is validated by its application to major Adriatic arch bridges with spans ranging from 200 m to almost 400 m as a part of an extensive project to develop their appropriate maintenance strategy. Seismic assessment is further developed and their suitability is proved at different bridge types.</p>

<p>Numerous issues, including structural, environmental and economic indicators, that are to be considered in order to achieve efficient and effective performance of existing concrete arch bridge will be systematized and elaborated in this paper through the examples of several Croatian Adriatic arch bridges.</p>

<p>Research on development of assessment procedures for existing bridges exposed to wind load will be presented in this paper. Both linear and the nonlinear methods are used and a probabilistic model of wind load is developed. The results were evaluated following the demands defined by current European design codes and specific location conditions. This procedure is validated by its application to major Adriatic arch bridges with spans ranging from 200 m to almost 400 m as a part of an extensive project to develop their appropriate maintenance strategy.</p>

Subject reviewThe paper deals with accurate determination of the relationship between bending moment and curvature of hollow rectangular bridge columns. With the calculation procedure to determine accurate curve of relationship, the method of determining the idealized diagram typically used in practice is also shown. The aim of this work is to point to a reserve in load capacity of an element when comparing the results of an accurate curve and the idealized diagram, and to analyse the impact of various calculation situations on the curve shape. The conclusion is that for practical use it is sufficient to use the idealized diagram, but for detailed scientific analysis the exact relationship between bending moment and curvature must be determined. Keywords: bending moment; bridge columns; curvature; hollow sectionIznalaženje odnosa momenta savijanja -zakrivljenosti armiranobetonskih stupova šupljeg presjeka na mostovima Pregledni članak Predmet rada je točno određivanje odnosa momenta savijanja i zakrivljenosti šupljih pravokutnih stupova mostova. Uz postupak proračuna točne krivulje odnosa prikazan je i način određivanja idealiziranog dijagrama obično korištenog u praksi. Cilj rada je ukazati na zalihu nosivosti elementa u usporedbi točne krivulje i idealiziranog dijagrama te analizirati utjecaj različitih proračunskih situacija na oblik krivulje. Zaključak je da je za praktičnu uporabu dovoljno koristiti idealizirani dijagram dok se za detaljne znanstvene analize mora određivati točan odnos momenta savijanja i zakrivljenosti.

In order to sustain the equilibrium between the nature and requirements on structures based on contemporary standards, research on development of assessment procedures for existing arch bridges exposed to wind load and located in seismic active areas is developing through last few years in Croatia as a part of an extensive project to develop their appropriate maintenance strategy. In this paper an overview of assessment results for Adriatic arch bridges with spans ranging from 200 m to almost 400 m will be presented. More detailed assessment of the Krk Bridge spanning 244 m and exposed to severe wind load will be presented.