https://journals.vilniustech.lt/index.php/EST/issue/feedEngineering Structures and Technologies2025-02-11T08:26:53+02:00Dr Remigijus Šalnaesn@vilniustech.ltOpen Journal Systems<p>Engineering Structures and Technologies publishes original research on the implementation of scientific and technical equipment in sustainable building. <a href="https://journals.vilniustech.lt/index.php/EST/about">More information ...</a></p>https://journals.vilniustech.lt/index.php/EST/article/view/18403Analysis for symmetrical and asymmetrical loading of a single-span combined string steel structure2023-01-20T18:15:01+02:00Edmundas Beivydasedmundas.beivydas@vilniustech.lt<p>The article consists of 3 parts. String analyzes with symmetrical loading, combined parametric analyzes of string structure with symmetrical loading and combined string structure analyzes with asymmetrical loading. Through various parameters, the influence of different parameters of the string on its behavior is revealed. The influence of prestressing in the combined string structure is also released. To assess the correctness of the results, an experimental study was carried out in the laboratory, after the structure was designed from steel elements.</p> <p><strong>First published online</strong> 20 January 2023</p>2022-12-30T00:00:00+02:00Copyright (c) 2022 The Author(s). Published by Vilnius Gediminas Technical University.https://journals.vilniustech.lt/index.php/EST/article/view/23007Modification of partial safety factors for a semi-probabilistic evaluation of existing timber structures2025-02-11T08:26:53+02:00Maria Loebjinskim.loebjinski@tu-braunschweig.deZheng Lim.loebjinski@tu-braunschweig.deWolgang Rugm.loebjinski@tu-braunschweig.deHartmut Pasternakm.loebjinski@tu-braunschweig.de<p>The evaluation of the load-bearing capacity of existing structures is a central and important part in the work of structural engineers. Currently, engineers are confronted with the challenge of applying design rules developed for new structures in the evaluation of existing ones as no specific recommendations exist on a European level. As a contribution to this, a first step of this study is the evaluation of the reliability level of timber elements subjected to common limit states. Based on these analyses, modifications of the target reliability and of partial safety factors (PSF) for existing structures on the resistance side are studied. Considering a modification of the target reliability, the PSF for the material strength could be proposed with <img src="/public/site/images/irena/Screenshot_2025-02-10_152148.png" width="78" height="18"> for compressive and flexural strength in limit states, where variable actions are present. Additionally, options for incorporating updated material parameters from a survey on site supported by technical devices are discussed and further need for research is identified. Subsequently, this paper provides a stepwise evaluation procedure including modified PSF considering both, an update of the target reliability and update of the material parameters obtained by a survey on site and is thus adaptive for different individual cases and level of information. </p> <p><strong>First published online</strong> 10 February 2025</p>2022-12-30T00:00:00+02:00Copyright (c) 2022 The Author(s). Published by Vilnius Gediminas Technical University.