NorMoor JIP, Mooring Design Code Calibration

2017 ◽  
Author(s):  
Torfinn Hørte ◽  
Siril Okkenhaug ◽  
Øivind Paulshus
Keyword(s):  
Design Code ◽  
Code Calibration

Traffic loads on medium and long span bridges

1984 ◽  
Vol 11 (3) ◽  
pp. 556-573 ◽  
Author(s):  
D. J. Harman ◽  
A. G. Davenport ◽  
W. S. S. Wong
Keyword(s):  
Limit State ◽  
Structural Effect ◽  
Reference Period ◽  
Structural Effects ◽  
Highway Traffic ◽  
Design Code ◽  
Long Span Bridges ◽  
Long Span ◽  
Code Calibration ◽  
Consistent Manner

A procedure is described for calculating two statistics, the mean and the coefficient of variation, for largest live load effects in a bridge structure caused by highway traffic during a reference period. These statistics are pertinent in the selection of highway live loads and calibration of a statistically based design code. The reference period depends on the limit state being calibrated.Using weights and dimensions of trucks from a 1982 survey in Ontario, congested traffic moving through one bridge length is repeatedly simulated for various “truck densities.” Herein truck density is the number of trucks on a length of highway divided by the maximum number that could occupy the length. When simulating traffic of one density crossing one influence line, the largest structural effect per traffic move has a frequency distribution that, with reasonable accuracy, is idealized as Gaussian.Observed multiple truck presence is modelled by a modified Poisson distribution that has three parameters. For one set of these traffic parameters, mean largest structural effects are shown to vary in a consistent manner with truck density, truck volume, and one parameter characterizing the tributary area of the effect. Based on these observations, more concise procedures for simulation and calculation are recommended. Key words: statistics, probability, truck survey, bridge loads, structural effects, bridge design, code calibration.

Reliability-based design code calibration for concrete containment structures

1991 ◽  
Vol 128 (2) ◽  
pp. 207-216 ◽  
Author(s):  
Bong Koo Han ◽  
Hyo Nam Cho ◽  
Sung Pil Chang
Keyword(s):  
Design Code ◽  
Reliability Based Design ◽  
Code Calibration

Evaluation of the Current Concrete Design Code on Shear and End Anchorage of Deep Beams by a Limit Analysis Based on Concrete Plasticity

2012 ◽  
Vol 18 (11) ◽  
pp. 1311-1318
Author(s):  
Hosoon Choi ◽  
Sung-Gul Hong ◽  
Young Hak Lee ◽  
Heecheul Kim ◽  
Dae-Jin Kim
Keyword(s):  
Limit Analysis ◽  
Design Code ◽  
Deep Beams

scholarly journals Code Calibration of the Eurocodes

2021 ◽  
Vol 11 (12) ◽  
pp. 5474
Author(s):  
Tuomo Poutanen
Keyword(s):  
High Reliability ◽  
High Accuracy ◽  
Variable Load ◽  
Reliability Model ◽  
Safety Factors ◽  
Rounding Errors ◽  
Code Calibration ◽  
Load Factors ◽  
Characteristic Values

This article addresses the process to optimally select safety factors and characteristic values for the Eurocodes. Five amendments to the present codes are proposed: (1) The load factors are fixed, γG = γQ, by making the characteristic load of the variable load changeable, it simplifies the codes and lessens the calculation work. (2) Currently, the characteristic load of the variable load is the same for all variable loads. It creates excess safety and material waste for the variable loads with low variation. This deficiency can be avoided by applying the same amendment as above. (3) Various materials fit with different accuracy in the reliability model. This article explains two options to reduce this difficulty. (4) A method to avoid rounding errors in the safety factors is explained. (5) The current safety factors are usually set by minimizing the reliability indexes regarding the target when the obtained codes include considerable safe and unsafe design cases with the variability ratio (high reliability/low) of about 1.4. The proposed three code models match the target β50 = 3.2 with high accuracy, no unsafe design cases and insignificant safe design cases with the variability ratio 1.07, 1.03 and 1.04.

scholarly journals Development of Fragility Curves for Piping and Slope Stability of River Levees

Water ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 738
Author(s):  
Nicola Rossi ◽  
Mario Bačić ◽  
Meho Saša Kovačević ◽  
Lovorka Librić
Keyword(s):  
Slope Stability ◽  
Fragility Curves ◽  
Safety Margin ◽  
Water Levels ◽  
Flood Event ◽  
Soil Parameters ◽  
Design Code ◽  
A Site ◽  
Insight Into

The design code Eurocode 7 relies on semi-probabilistic calculation procedures, through utilization of the soil parameters obtained by in situ and laboratory tests, or by the means of transformation models. To reach a prescribed safety margin, the inherent soil parameter variability is accounted for through the application of partial factors to either soil parameters directly or to the resistance. However, considering several sources of geotechnical uncertainty, including the inherent soil variability, measurement error and transformation uncertainty, full probabilistic analyses should be implemented to directly consider the site-specific variability. This paper presents the procedure of developing fragility curves for levee slope stability and piping as failure mechanisms that lead to larger breaches, where a direct influence of the flood event intensity on the probability of failure is calculated. A range of fragility curve sets is presented, considering the variability of levee material properties and varying durations of the flood event, thus providing crucial insight into the vulnerability of the levee exposed to rising water levels. The procedure is applied to the River Drava levee, a site which has shown a continuous trend of increased water levels in recent years.

Structural Integrity for Nuclear Power Plant Against Excessive Load on Design Extension Condition

2013 ◽  
Author(s):  
Daigo Watanabe ◽  
Kiminobu Hojo
Keyword(s):  
Nuclear Power ◽  
Structural Integrity ◽  
Safety Factors ◽  
Design Code ◽  
Acceptance Criteria ◽  
Integrity Assessment ◽  
Current Design ◽  
Factor Design ◽  
Excessive Load ◽  
Load And Resistance Factor

This paper introduces an example of structural integrity evaluation for Light Water Reactor (LWR) against excessive loads on the Design Extension Condition (DEC). In order to assess the design acceptance level of DEC, three acceptance criteria which are the stress basis limit of the current design code, the strain basis limit of the current design code and the strain basis limit by using Load and Resistance Factor Design (LRFD) method were applied. As a result the allowable stress was increased by changing the acceptance criteria from the stress basis limit to the strain basis limit. It is shown that the practical margin of the LWR’s components still keeps even on DEC by introducing an appropriate criterion for integrity assessment and safety factors.

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