Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Determination of load combination factors for code calibration
https://orcid.org/0000-0001-6166-0895
Abstract Semi-probabilistic methods are widely used for structural engineering design and assessment. In such methods, the safety and performance adequacy of structures are typically tied to partial safety factors for load and resistance, and load combination factors. There exist some heuristic strategies for estimating these partial factors, such as the design value method and first order reliability coefficient method. However, when adopted for the estimation of load combination factors, these strategies are either inaccurate or have non-unique estimates. Excessive conservatism in factor estimates is not desirable, particularly for the performance assessment of existing structures. In this study we propose a method for estimating load combination factors using a matrix linear algebra approach. Specifically, we develop a closed-form analytical expression to estimate unique load combination factors for typical code calibration problems. A comparative study of the existing heuristic approaches with the new approach is presented and demonstrated on two case studies. It is shown that the proposed method offers a valuable means of deriving load combination factors: one that avoids hueristics, and conservatism.
Highlights Load combination factors for code calibration are considered. The traditional approaches are shown to have shortcomings. A closed-form optimum solution to the problem is developed. The new expression will improve code calibrations.
Determination of load combination factors for code calibration
https://orcid.org/0000-0001-6166-0895
Abstract Semi-probabilistic methods are widely used for structural engineering design and assessment. In such methods, the safety and performance adequacy of structures are typically tied to partial safety factors for load and resistance, and load combination factors. There exist some heuristic strategies for estimating these partial factors, such as the design value method and first order reliability coefficient method. However, when adopted for the estimation of load combination factors, these strategies are either inaccurate or have non-unique estimates. Excessive conservatism in factor estimates is not desirable, particularly for the performance assessment of existing structures. In this study we propose a method for estimating load combination factors using a matrix linear algebra approach. Specifically, we develop a closed-form analytical expression to estimate unique load combination factors for typical code calibration problems. A comparative study of the existing heuristic approaches with the new approach is presented and demonstrated on two case studies. It is shown that the proposed method offers a valuable means of deriving load combination factors: one that avoids hueristics, and conservatism.
Highlights Load combination factors for code calibration are considered. The traditional approaches are shown to have shortcomings. A closed-form optimum solution to the problem is developed. The new expression will improve code calibrations.
Determination of load combination factors for code calibration
https://orcid.org/0000-0001-6166-0895
Abstract Semi-probabilistic methods are widely used for structural engineering design and assessment. In such methods, the safety and performance adequacy of structures are typically tied to partial safety factors for load and resistance, and load combination factors. There exist some heuristic strategies for estimating these partial factors, such as the design value method and first order reliability coefficient method. However, when adopted for the estimation of load combination factors, these strategies are either inaccurate or have non-unique estimates. Excessive conservatism in factor estimates is not desirable, particularly for the performance assessment of existing structures. In this study we propose a method for estimating load combination factors using a matrix linear algebra approach. Specifically, we develop a closed-form analytical expression to estimate unique load combination factors for typical code calibration problems. A comparative study of the existing heuristic approaches with the new approach is presented and demonstrated on two case studies. It is shown that the proposed method offers a valuable means of deriving load combination factors: one that avoids hueristics, and conservatism.
Highlights Load combination factors for code calibration are considered. The traditional approaches are shown to have shortcomings. A closed-form optimum solution to the problem is developed. The new expression will improve code calibrations.
Determination of load combination factors for code calibration
Caprani, Colin C. (Autor:in) / Khan, M. Shihabuddin (Autor:in)
Structural Safety ; 107
23.11.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Calibration of the load enhancement factors
| Elsevier | 1980
Calibration of Load Factors for Load and Resistance Factor Evaluation
| British Library Conference Proceedings | 1999
Calibration of combination factors for fire design situation
| British Library Conference Proceedings | 2005
Calibration of Load Factors for LRFR Bridge Evaluation
| NTIS | 2001