Analysis of Reasons for the Structural Collapse of Historic Buildings

Drobiec, Łukasz; Grzyb, Krzysztof; Zając, J.

doi:10.3390/su131810058

Cited by 15 publications

(10 citation statements)

References 27 publications

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“…The minor-destructive test on the mortar in the existing structure is frequently performed in order to use the results obtained for determining the masonry compressive strength [ 55 , 56 , 57 ]. In such a case, it is often necessary to convert the estimated mortar strength obtained in the MDT test to the mortar compressive strength determined on half-beam specimens 4 × 4 × 8 cm 3 [ 58 ].…”

Section: Discussionmentioning

confidence: 99%

Prediction of Mortar Compressive Strength Based on Modern Minor-Destructive Tests

Łątka

2023

Materials

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The crucial task of the diagnosis of an existing masonry structure is to assess the current values of the mechanical parameters of the materials from which the structure was erected—usually bricks and mortar. The article presents the results of minor-destructive tests carried out on bed joints of three-brick-masonry prisms prepared in the laboratory. Three types of mortars used in the masonry were tested, which differ by the type and amount of binder. In order to determine mortar compression strength, three modern diagnostic methods were used: double punch test (DPT), standard penetrometric test (PT) and torque penetrometric test (TPT). Tests were carried out after 4, 12 and 90 weeks. The mortar strength determined in each of these tests was compared with the mortar reference strength determined on the beam specimen according to the methodology given in EN 1015-11. The results of the conducted tests confirmed the high usefulness of all three diagnostic methods. However, limitations in the application of the PT test were noticed—only lime mortars and weak cement–lime mortars can be tested with this method. In the case of mortars with an increased amount of cement binder, the impact energy is too low to estimate the compressive strength of the mortar in the brick wall joint. Technical limitations in the use of TPT and DPT tests were also indicated—weak lime mortars with low cohesion do not allow for obtaining reliable results. It was shown that DPT results strongly depend on two factors, specimen slenderness and mortar strength. Due to this fact, simple non-parameter conversion from mortar compressive strength according to the DPT test into mortar reference strength may lead to significant overestimation. As the results show, in newly built masonry, proper selection of diagnostic method is crucial due to the strong dependence of mortar curing dynamics on its location in the joint. This paper helps to match diagnostic techniques with the condition and type of mortar in the existing structure.

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Section: Discussionmentioning

confidence: 99%

Prediction of Mortar Compressive Strength Based on Modern Minor-Destructive Tests

Łątka

2023

Materials

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“…Only by uncovering, it is possible to fully assess the quality of brick and mortar and their degree of degradation. The evaluation of the material properties of the structure is possible by taking representative samples and performing laboratory tests [2,10,[54][55][56][57][58][59]. A deeper analysis of the performance of the structure and the causes of its damage is possible using FEM-based 3D models [57][58][59][60][61][62][63][64].…”

Section: Introductionmentioning

confidence: 99%

“…The evaluation of the material properties of the structure is possible by taking representative samples and performing laboratory tests [2,10,[54][55][56][57][58][59]. A deeper analysis of the performance of the structure and the causes of its damage is possible using FEM-based 3D models [57][58][59][60][61][62][63][64]. On this basis, it is possible to precisely select the reinforcement methods.…”

Section: Introductionmentioning

confidence: 99%

Research and TLS (LiDAR) Construction Diagnostics of Clay Brick Masonry Arched Stairs

et al. 2022

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The study presents the terrestrial laser scanning (TLS) diagnostic of the clay brick masonry arched staircase in a historic building. Based on the measurements of the existing arched stair flights, 1:1 scale experimental models with and without stair treads were made. Strength tests of the models were carried out for different concentrated force locations in relation to the supporting structure. Force, deflections and reaction in the upper support of the run were measured during the tests. The influence of the masonry steps on the curved vault on the load capacity and stiffness of the run structure was analyzed. The conducted experimental investigations showed that the key element responsible for the actual load-bearing capacity and stiffness of this type of stair flights were the treads above the masonry arch.

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“…Poor management and lack of maintenance of buildings that have been in continuous use for more than a century threaten the durability of the structure and, consequently, the safety of users [ 1 , 2 ]. Ignoring the need for retrofit work can accelerate the degradation processes of building materials [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Diagnostics of the RC Roofing Structure of the 100-Year-Old Municipal Theatre Facility

2022

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Reinforced concrete has been a widely used material for the construction of buildings for many decades. However, with the passage of time, the material characteristics and connection of structural elements gradually degrade. Development in measurement technology makes it possible to efficiently obtain data on the current state of the structure and material characteristics using non-destructive methods, with limited or no destructive testing. The paper presents the analysis of the condition of the reinforced concrete roof of a 100-year-old theatre building in terms of its further use after planned modernisation. The tests carried out in situ as well as the computational analysis of structure are described. Based on the test results, the current load-bearing capacity was assessed and the limit state conditions were checked. Limitations on the accuracy of the non-destructive test results in relation to the destructive test results were formulated. Options for the strengthening reinforced concrete beams with regard to structural and technological considerations were analysed.

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Analysis of Reasons for the Structural Collapse of Historic Buildings

Cited by 15 publications

References 27 publications

Prediction of Mortar Compressive Strength Based on Modern Minor-Destructive Tests

Prediction of Mortar Compressive Strength Based on Modern Minor-Destructive Tests

Research and TLS (LiDAR) Construction Diagnostics of Clay Brick Masonry Arched Stairs

Diagnostics of the RC Roofing Structure of the 100-Year-Old Municipal Theatre Facility

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