Failure Resistance of the Historic Stone Bridge Structure of Charles Bridge. I: Susceptibility to Nonstress Effects

Witzany, Jiří; Čejka, Tomáš; Zigler, Radek

doi:10.1061/(asce)0887-3828(2008)22:2(71)

Cited by 8 publications

(11 citation statements)

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“…However, the large number of existing stone bridges, at an international level, creates a considerable and invaluable stock of cultural heritage assets, which demands appropriate maintenance, conservation, and protection in order to ensure their preservation for future generations. Stone arch bridges in particular are in the center of significant scientific research worldwide [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

The Plaka Bridge in Epirus: An Evaluation of New Building Materials for Its Restoration

et al. 2019

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The sustainable preservation of monuments requires the use of performing materials which are at the same time compatible with the monument’s historical building materials to ensure structural integrity, adequate performance of the structure in earthquake stresses, and resilience of both restoration and historical materials. This is especially true for cultural heritage assets that have experienced major destruction, demanding extensive reconstruction. The Plaka Bridge in Epirus, Greece, partially collapsed after a heavy rainfall in 2015. It was a supreme example of traditional stone bridge architecture of the region and an important landmark. In the present study, a potential restoration stone from a nearby quarry was examined in terms of compatibility in relation to the dominant historical building stone of the bridge, as well as in terms of mechanical performance, through a variety of in lab techniques. In addition, criteria were set for restoration mortars, taking into account the characteristics of the historical materials, as well as the environment of the bridge. The results of the study regarding the restoration stone and mortars are presented and assessed, in order to select the most appropriate restoration materials for Plaka Bridge in its upcoming restoration, aiming to enhance the overall resilience of the structure.

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Section: Introductionmentioning

confidence: 99%

The Plaka Bridge in Epirus: An Evaluation of New Building Materials for Its Restoration

et al. 2019

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“…The failure mechanism of masonry loaded in concentric compression and the exhaustion of its load-bearing capacity in compression are characterised by the appearance and development of vertical, mainly tensile cracks. The first cracks arise at the points of a masonry structure where the acting tensile normal stress σ x (principal stress σ 1 ) exceeds the local tensile strength of masonry, or where the transverse deformation exceeds the ultimate relative tensile strain (Witzany et al 2008;Winkler 1975).…”

Section: Introductionmentioning

confidence: 99%

“…Due to the interaction between mortar and masonry units ( Fig. 1), spatial stress state arises in the masonry (Witzany et al 2006(Witzany et al , 2008.…”

Section: Introductionmentioning

confidence: 99%

“…Jiří WITZANY. Professor, DrSc, Dr h.c., Eng., Rector Emeritus, Dean FCE CTU 1990-1996, Rector CTU 2000-2006, Department of Building Structures (Head of the Department 1990-2008, Faculty of Civil Engineering, Czech Technical University in Prague, Czech Republic. Professional activities during last 10 years: Chief researcher of 2 research plan and 10 grant, author and co-author of 10 monographs, 10 utility designs, 5 patents, 58 scientific and professional articles and over 80 papers on national and international conferences, 25 research reports.…”

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confidence: 99%

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Assessment of Compressive Strength of Historic Mixed Masonry

Witzany

Čejka

Sýkora

et al. 2015

Journal of Civil Engineering and Management

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The majority of load-bearing masonry structures of historic buildings are built of mixed or stone masonry composed of regular or irregular (so-called quarry) masonry units – bricks, sedimentary and metamorphic rock – possessing often very different physical and mechanical characteristics. The identification of residual mechanical properties of stone or mixed masonry of irregular walling units requires the application of a suitable diagnostic method, the assessment of the phase of degradation processes and the choice of an appropriate probabilistic model for the strength of mixed masonry. The presented experimental research involves the analysis of the heterogeneity (homogeneity) of mixed masonry of a church from the 17th century. The probabilistic model for masonry strength is developed on the basis of destructive and non-destructive testing of masonry units and mortar. It appears that the probabilistic approach leads to a design value by 75% higher than the deterministic approach.

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“…Undermining the foundation can induce several negative effects which may jeopardize the integrity of arch bridge components or even global stability. These include (i) rupture of the foundation plinth due to the loss of support [19], (ii) failure of the foundation-soil system [20], (iii) cracking and mechanism formation due to angular rotation, (iv) subsidence, and/or (v) shift of the bridge pier's [21]. Finally, it is worth noting that the low clearance offered by arch bridges makes them very susceptible to debris accumulation, and this may increase both scour development and hydrodynamic forces [22].…”

Section: Flood-induced Actionsmentioning

confidence: 99%