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Abstract

Due to demand of tightness, the liquid tanks should be designed with particular care. In addition to the liquid pressure, the imposed concrete strains and thermal actions should be taken into consideration. Furthermore, the verification of the ULS in persistent design situation only is not sufficient. The crack control both in persistent situation as well as in early age transient one is necessary for determination of the reinforcement. In the beginning of the design process some assumptions, influencing the future tank performance must be made. First, the tightness class must be chosen, followed by formulation of conditions for crack width control. Next, the critical age of concrete, proper for early age transient situation should be assumed. This age determines the value of imposed strain on the one hand and the effective tensile concrete strength on the other. Then, it should be decided, if any reduction of the effective tensile strength would be applied (reduction associated with nonuniform imposed strain and reduction due to cracking under other combination of actions). Eventually, the decisions for structural analysis should be made, concerning the values of combination factors for actions both for ultimate and cracking limit state and the possible reduction of cross-section stiffness due to cracking caused by thermal actions in ULS.

The above-mentioned assumptions are listed and discussed in the paper. On the basis of the discussion the algorithm for crack control in concrete tanks is worked out and proposed. The issues are illustrated with practical example of cylindrical tank for liquid.

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Authors and Affiliations

Anna Halicka
ORCID: ORCID
Dominika Franczak-Balmas
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Abstract

The article presents the process of structural diagnostics of the Dominican monastery in Lublin. In order to establish the underlying cause of cracks, not only in situ investigations but also detailed analyses of documents were executed. Inventory drawings were examined in order to identify the building’s structural system. The query of historical documents and city archives was carried out to understand the structure’s performance. Conclusions were confronted with the crack pattern. It was established that the damage resulted from the original conditions of the structural system in place. These conditions were created in past, when the monastery incorporated sections of the medieval town wall into its structure.
The article details structural remedies applied in the course of rehabilitation. The introduction of supporting structures was the effect of a compromise between the necessity of ensuring structural safety and the demand for the minimum impact on the heritage site. The article aims to highlight that the structural assessment of the heritage asset is an investigative process. The work also emphasizes that in spite of numerous up-to-date methods helpful in the structural diagnostics of building structure, the conceptual analyses of the structural system still remain of vital importance. The query of historical documents helps in determining the structural system of a historic building, and vice versa, structural analyses assist in recognizing and supplementing the knowledge of the asset’s history.
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Authors and Affiliations

Anna Halicka
1
ORCID: ORCID
Anna Ostańska
1
ORCID: ORCID

  1. Lublin University of Technology, Faculty of Civil Engineering and Architecture, ul. Nadbystrzycka 40, 20-618 Lublin

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