Wyniki wyszukiwania - BazTech

1

Comparison of approaches to reliability verification of existing steel structures

Nadolski Vitali, Holický Milan, Sykora Miroslav, Tur Viktar

Budownictwo i Architektura

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2022

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Vol. 21, no 4

13--24

EN

Many existing steel structures are exposed to degradation due to corrosion or fatigue and to increasing loads. Their reliability assessment is then needed. The key question is whether a particular structure can be preserved ‘as it is’, or needs to be strengthened, or whether it needs to be replaced. Unnecessary replacements of existing structures may be avoided and the remaining service life of existing steel structures may be authorized by: using advanced reliability verification techniques, optimizing target reliability, and obtaining data for a specific site or structure. In this contribution, the application of advanced reliability approaches is illustrated by the assessment of an existing steel structure. The case study demonstrates that such approaches may significantly improve assessment and allow to increase the load-bearing capacity of the structure (in the case under investigation by 10 to 20%). Improvements in reliability assessment are attributed to the use of an optimal target reliability level, case-specific statistical parameters and probabilistic distributions of the basic variables, and adjusted partial factors.

2

Assesment of existing reinforced concrete structures with usage of the fuzzy logic - based expert system

Tur Viktar, Yalavaya Yuliya

Modern Engineering

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2019

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2

61--70

EN

Fuzzy logic is a useful tool when assessing the existing reinforced concrete structures. The introduction of expert system in assessing the technical condition of the existing structures built on the fuzzy logic represents a transition to a new and higher-quality level for the survey of constructions sites. As a result, it is seen that the assessment of the existing building with the usage of the proposed expert system complies with the estimation of the qualified experts.

3

Problems of assessing the duration and cost of restoration projects on the example of Poland, Slovakia and Lithuania

Radziszewska-Zielina E., Szewczyk B., Sroka B., Śladowski G., Mesároš P., Kutut V.

Przegląd Naukowy Inżynieria i Kształtowanie Środowiska

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2018

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Vol. 27, No. 1

3--8

EN

The restoration of existing structures, especially historical ones, is a complicated endeavour. The often insuffi cient identification of the extant state of a building, the possibility of archaeological fi ndings and the necessary procedures involving the securing and conservation of historical substance lead to diffi culties in assessing the duration and cost of a planned project. The goal of the article is the presentation of the results of a study focusing on these assessments. Surveys were carried out among a group of developers, designers and contractors from Poland, Lithuania and Slovakia – all of whom had experience in the restoration of historical structures. The analysis of the results pointed to a low accuracy of the assessment of the cost of construction of these types of projects. The respondents expressed the need to take into account additional costs of the carrying out of these types of projects. The respondents highlighted the need to take into account additional costs of the performing of additional and substitute work as a result of considering different scenarios of the construction of restoration projects.

4

Reliability assessment of existing structures

Marková J.

Journal of KONBiN

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2008

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No. 1 (4)

149-164

EN

The international standard ISO 13822 provides procedures for the reliability assessment of existing structures including the application of probabilistic methods. Probabilistic approach facilitates to decide about new exploitation of existing structures. Application of probabilistic methods for the reliability assessment of existing structures is shown on the example of deteriorated balcony beams.

5

Assessment of existing structures and rehabilitation of existing buildings

Chmielewski T.

Zeszyty Naukowe. Budownictwo / Politechnika Opolska

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2003

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z. 47

9-16

EN

In the first part of this paper the general principles and procedures for assessment of existing structures based on the International Standard ISO 13822 are given. In the second part an overview of the state-of-the-art in techniques for seismic rehabilitation of existing buildings is presented. First, typical techniques used for reinforced concrete, steel and masonry building are summarized in accordance with the aims of rehabilitation. New approaches to utilize seismic isolation and supplemental damping, as well as conventional strengthening techniques, to infill, brace and jacket existing structure are described.