Partial safety factors for homogeneous reliability of nonlinear reinforced concrete columns

Mohamed, Alaa; Soares, Rodrigo de Carvalho; Venturini, W. S.

doi:10.1016/s0167-4730(01)00009-1

Cited by 25 publications

(14 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In Brazilian and European design codes, a different partial resistance factor is used for each structural material. It is widely accepted (Kogut and Chou, 2004;Mohamed et al, 2001) that the ANSI/AISC format lacks flexibility, and results in non-uniform reliability in problems involving more than one structural material (for example, reinforced concrete or steel-concrete composites).…”

Section: Comparison Of Code Formatsmentioning

confidence: 99%

A first attempt towards reliability-based calibration of Brazilian structural design codes

Beck¹,

Souza²

2010

J. Braz. Soc. Mech. Sci. & Eng.

View full text Add to dashboard Cite

Section: Comparison Of Code Formatsmentioning

confidence: 99%

A first attempt towards reliability-based calibration of Brazilian structural design codes

Beck¹,

Souza²

2010

J. Braz. Soc. Mech. Sci. & Eng.

View full text Add to dashboard Cite

“…Based on the differences of reliability levels under fixed eccentricity, a group of partial safety factors was studied and proposed to achieve homogeneous reliability design of RC columns (Mohamed et al 2001). However, the corresponding analysis of reliability differences is not sufficient for RC columns with random eccentricity.…”

Section: Figure 1 Column Failure In Wenchuan Earthquakementioning

confidence: 99%

Robust Analysis of Current Reliability-Based Design Method for RC Columns with Tension Failure under Random Eccentricity.

Jiang¹,

Lü²,

Yang³

2014

Vulnerability, Uncertainty, and Risk

View full text Add to dashboard Cite

The current methods for designing reinforced concrete (RC) columns are mainly based on the reliability calibration under fixed eccentricity criterion. However, for an RC column under combined vertical gravity load and horizontal earthquake action, its eccentricity would be random due to probability properties of these loads. According to the capacity models in Chinese code, the failure function with random eccentricity is obtained and found to be a complex one, which is largely different from the one obtained by the fixed eccentricity criterion. Based on the prescribed statistical models of relevant variables, the differences of failure probability are analyzed for RC columns with different load effect ratios and different strong column factors by the Monte Carlo method. Compared with the fixed eccentricity case, such differences under random eccentricity would be much larger among different cases. Thus, the current design method of RC column is hard to achieve a robust design.

show abstract

“…The ultimate and serviceability constraints in deterministic optimization model [Eq. (2)] are transformed to probabilistic constraints, where the ith limit state function G i is given in terms of design variables d and random variables X. In the above model, the probabilistic constraints define the feasible domain, such as the failure probability P f of the limit state G i should be lower than the allowable probability P T f .…”

Section: Probabilistic Design Optimizationmentioning

confidence: 99%

“…Furthermore, the optimization process has a large effect on structural safety. The use of prescribed partial safety factors in designing RC structures, although convenient, is not adapted to determine the reliable design, as these factors are calibrated for a large class of structures [2]. In fact, the partial safety factors are not directly linked to uncertainties of the overall system performance, therefore these safety factors can not guarantee the required safety level of the optimum deterministic design.…”

Section: Introductionmentioning

confidence: 99%

Optimal Design Under Uncertainty of Reinforced Concrete Structures Using System Reliability Approach

Aoues

Chateauneuf

Lemosse

et al. 2013

Int. J. UncertaintyQuantification

View full text Add to dashboard Cite

The design of reinforced concrete (RC) structures involves several kinds of uncertainties, which are usually considered through the partial safety factors prescribed in the codes of practice. The traditional design optimization of RC structures uses deterministic information of the problem. The partial safety factors are used to consider loading fluctuation and the variability of material properties. The use of these safety factors in deterministic optimization usually leads to over-designing structures, as these safety factors are calibrated for a large class of structures. In the deterministic optimization procedure the reliability cannot be controlled. For this reason, the Reliability-Based Design Optimization (RBDO) is devoted to design economical and reliable structures. However, the RBDO problem involves the evaluation of probabilistic constraints performed by the reliability analysis. The most common RBDO formulations are based on a nested optimization problem, with an outer loop for the design optimization and an inner loop for the reliability analysis. Therefore, an expensive computation effort is required to solve the RBDO problem. In this paper, a new RBDO method of RC structures is proposed. The RBDO problem is decomposed to several cycles of deterministic design optimization (DDO) based on new safety factors called Optimal System Safety Factors (OSSF). At each cycle of the DDO, the system reliability analysis is performed to verify the reliability of the optimal design, the OSSF are computed by a probabilistic method on the basis of the previous system reliability analysis, then the updated OSSF are provided for the next cycle of the DDO. The application to the design of an RC structure shows the interest and the efficiency of the proposed method.

show abstract

Partial safety factors for homogeneous reliability of nonlinear reinforced concrete columns

Cited by 25 publications

References 8 publications

A first attempt towards reliability-based calibration of Brazilian structural design codes

A first attempt towards reliability-based calibration of Brazilian structural design codes

Robust Analysis of Current Reliability-Based Design Method for RC Columns with Tension Failure under Random Eccentricity.

Optimal Design Under Uncertainty of Reinforced Concrete Structures Using System Reliability Approach

Contact Info

Product

Resources

About