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2 2024

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Assessment of safety of masonry buildings near deep excavations: impact of excavations on structures

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Jasiński R. , Skrzypczak I. , Leśniak A. , Natividade E.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2024

tom Vol. 72, nr 4

art. no. e149817

The knowledge of the impact and the load-bearing capacity of unstrengthened/strengthened structures is a crucial source of information about the safety of masonry buildings near deep excavations, especially in dense urban areas. Incorrect calculations made for such designs can seriously affect not only an analyzed object but also the adjacent buildings. The safety of masonry buildings can be determined by many factors that are closely related to the hazards presented during the performance of deep excavations. These factors are at first identified and then prioritized. The AHP process in the multi-criteria analysis was used to support the decision-making process related to the verification of factors affecting the safety assessment of masonry buildings in the area of deep excavations. The proper design of building structures, including the verification of the structure strengthening near deep excavations, was found to be the most significant factor determining the safety of such buildings. The methodology for proceeding with the verification of ultimate (ULS) and serviceability (SLS) limit states in accordance with the literature data, current regulations, such as Eurocode 6 and other design standards, and the know-how of the authors, described in this paper was the next stage of the discussed analysis.

Prioritization of the Requirements Formulated in the European Standard EN 206 in Assessment of Concrete Quality - Multicriteria Analysis Using the AHP Method

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Skrzypczak I. , Leśniak A. , Jasiński R. , Natividade E.

Civil and Environmental Engineering Reports

2024

tom Vol. 34, no. 1

104--115

The technological process of ready-mixed concrete production, which is designed to ensure the quality of concrete and the durability of the constructed buildings in accordance with the European Standard EN 206, consists of several stages. In this standard, to ensure the stability of both the concrete production process itself and its individual stages, appropriate requirements have been formulated. Some of these requirements pertain to the on-line stage of the production process, and some to the off-line stage. Some of these requirements, if not properly controlled, can disrupt the stability of the production process and also negatively impact the quality and durability of concrete structures. The article analyzes the significance of these standard requirements. For this purpose, the AHP method was used, and the Pareto principle was applied to interpret the results. The AHP analysis showed that three out of seven requirements have the most significant impact on the quality of concrete and concrete structures. These are: the constituents of concrete, the limitations for concrete composition, and the delivery of fresh concrete. The applied Pareto principle confirmed their dominant role. These three criteria account for almost 80% of the importance in ensuring the quality of concrete.