Uncertainty in resistance models for historic cast-iron columns

Brych, Ivan; Holický, Milan; Jung, Karel; Sýkora, Milan

doi:10.2495/sc150411

Cited by 5 publications

(2 citation statements)

References 13 publications

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“…More detailed analysis could be based on the approaches to load combination described in [2]. The probabilistic model of θ R is based on results of the detailed study focused on uncertainties in predicting compressive resistance of cast-iron columns [23]. The probabilistic analysis leads to the reliability index β ≈ 3.5 when a reinforced concrete slab is applied (alt.…”

Section: Reliability Verification Of Columnsmentioning

confidence: 99%

Basis for reliability assessment of industrial heritage buildings and a case study of a 19th century factory

Marková¹,

Holický²,

Jung³

et al. 2017

Int. J. HA

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Considerable efforts are aimed at re-using industrial heritage buildings in order to preserve their heritage value, revive declining regions and avoid wasting energy. Such buildings hardly fulfil the requirements of present standards for structural design. Decisions about construction interventions should be based on the complex assessment of a structure considering actual material properties, environmental influences and satisfactory past performance. Simplified conservative procedures accepted for structural design often lead to expensive repairs and losses of heritage value. The probabilistic procedure in accordance with ISO 13822 for assessment of existing structures can considerably enhance reliability verification. Application of theoretical principles is illustrated by the case study of a 19th-century spinning factory, listed as industrial heritage. The actual characteristics of a cast-iron structure are verified by material tests, measurements of geometry and careful visual inspection. Actual behaviour of an existing structure and the previous load history is considered when deciding about its further use and rehabilitation. The case study indicates that the probabilistic methods can be effectively applied in reliability verifications of heritage buildings and decisions about construction interventions.

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Section: Reliability Verification Of Columnsmentioning

confidence: 99%

Basis for reliability assessment of industrial heritage buildings and a case study of a 19th century factory

Marková¹,

Holický²,

Jung³

et al. 2017

Int. J. HA

Self Cite

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“…Coefficients of variation for structural members from historic metals. ] developed a more complex model that accounts for the geometrical imperfections of cast-iron columns, the tensile strength significantly lower than the compressive strength, non-linear stress-strain curve and a low Young's modulus by checking failure due to yielding in compression and fracture in tension.While the uncertainty associated with Heyde and Lindner's model has not been investigated in detail yet, Brych et al[10] and Brych and Sykora[11] compared the predictions of Rondal and Rasmussen's model with the results of 72 full-scale tests of columns made of English iron and English grey cast iron. They derived μξ = 1.2-1.25 depending on slenderness and V ξ = 0.15.…”

mentioning

confidence: 99%

Optimising Surveys and Reliability Assessments of Historic Cast-Iron Columns

Jung

Marková

Sýkora

2018

WIT Transactions on the Built Environment

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Cast iron structures mostly date back to the second half of the 19th century. Material properties vary due to different composition and production techniques that have been used in different regions over decades. This is why it is of crucial importance to obtain case-specific information on properties of historic structures. Many historic metal structures do not fulfil requirements of present standards. Decisions about adequate construction interventions should be based on complex assessment of structural reliability. In this contribution, the material properties of an iron column are investigated and the key considerations for reliability assessment are presented. Three fundamental issues are addressed to optimise surveys and reliability assessments of cast iron columns: 1) an optimum number of material tests; 2) the selection between a finite element (FE) and analytical model; and 3) the target reliability level for a historic structure. It is shown that uncertainties due to limited test data, variability of material and geometrical properties, and resistance model uncertainty can be treated by a semi-probabilistic verification method. As a first approximation, five tensile tests might be considered as an optimum survey strategy. The application of FE models is more demanding than that of simplified analytical formulas, but it can better reflect structure-specific conditions and may increase structural resistance by about 15%. Optimum target reliability level for existing structures with a cultural heritage value could be lower than that for structural design and the assessment value of resistance may increase by about 20% for a reduced target level.

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Resistance Models for Semi-Probabilistic Assessment of Historic Steel Bridges

Lenner¹,

Ryjáček²,

Sýkora³

2020

IABSE Symposium, Wroclaw 2020: Synergy of Culture and Civil Engineering – History and Challenges

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<p>The mechanical properties of historic metal materials exhibit a considerable scatter dependent on periods of construction and the region of a producer. Assessments of historic metal bridges then need to be based on measurements and tests. The use of non- or minor-destructive tests (NDTs) is often preferred over to destructive tests (DTs) to reduce the cost of structural survey. This contribution explores the measurement errors associated with common NDT hardness techniques and quantifies uncertainties in design (assessment) values of resistance. When deriving the partial factor, the uncertainty in geometry and model uncertainty is considered along with the variability of a material property and measurement error. Numerical studies reveal the effects of measurement error and model uncertainty (bending, buckling) on assessment values of resistance. A unity mean and coefficient of variation of 12% might be adopted for the measurement uncertainty of the hardness methods under study as a first approximation. On average, the true assessment resistance is by ~15% larger than that based on a NDT survey. Model uncertainty affects the partial factor for resistance of historic metal bridges.</p>

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Uncertainty in resistance models for historic cast-iron columns

Cited by 5 publications

References 13 publications

Basis for reliability assessment of industrial heritage buildings and a case study of a 19th century factory

Basis for reliability assessment of industrial heritage buildings and a case study of a 19th century factory

Optimising Surveys and Reliability Assessments of Historic Cast-Iron Columns

Resistance Models for Semi-Probabilistic Assessment of Historic Steel Bridges

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