Exact and Invariant Second-Moment Code Format

Hasofer, A. M.; Lind, Niels C.

doi:10.1061/jmcea3.0001848

Cited by 2,054 publications

(330 citation statements)

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“…The expected values, along with the reliability index, become functions of the basic PSD design parameters ( , m, a, 1 , 2 , and ℎ). The FOSM method, based on the Hasofer-Lind (1974) method, was used as the reliability method in this study. This method works in standard normal space (Figure 5.2) using the following equations:…”

Section: Reliability Modelingmentioning

confidence: 99%

Development of framework for in-vehicle collision warning system considering driver characteristics

Hassein¹

2021

Preprint

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Passing collisions are one of the most serious traffic safety problems on two-lane highways. The purpose of this dissertation is to develop a framework for a passing collision warning system (PCWS) for two-lane highways that can help drivers avoid passing collisions by reducing the chance of human error. Specifically, the objectives of this research are: (1) to conduct a comprehensive literature review of existing collision warning systems, (2) to design driving simulator and field experiments for data collection, (3) to develop deterministic and reliability-based models for passing sight distance (PSD) that consider driver characteristics, (4) to develop an in-vehicle passing collision warning system, and (5) to develop a Simulink model that implements the proposed PCWS in a real time environment. A driving simulator was used to collect data from participants (males and females of different ages). The field study data werecollected on real highways using an in-vehicle video camera and a GPS data logger. The driving simulator and field data were used to develop the passing parameters for the proposed PSD model. The estimated parameters included initial time, passing time, and average acceleration rate. The results of the model were compared with those from existing models and design guidelines. The results revealed that the existing PSD models were either too liberal or too conservative. The reliability-based PSD model was developed using the First-Order Second-Moments method and a Monte Carlo Simulation was used to validate the model. The proposed PCWS uses a radar sensor placed in the passing vehicle to detect opposing vehicles travelling in the left lane and calculate their relative distance and speed in order to estimate the time to collision. This time is then compared with the time required for the passing vehicle to clear the path. The “safe pass” signal can assist passing drivers in preparing for a safe passing maneuver during the overtaking process. A Simulink MATLAB model was developed and used to implement the methodology of the proposed warning system. The different factors that affect system accuracy were examined. The application of the system was illustrated using an example.

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Section: Reliability Modelingmentioning

confidence: 99%

Development of framework for in-vehicle collision warning system considering driver characteristics

Hassein¹

2021

Preprint

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“…This problem was solved by the Hasofer-Lind method. 15 In this method, a reduced coordinate system and reduced variables are defined as…”

Section: The Algorithm Of Formmentioning

confidence: 99%

Preliminary reliability analysis of a high-altitude airship’s envelope

Liu

Wang

Chen

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part G:

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To analyze the reliability of an airship's envelope, the methodology of structural reliability analysis is adopted. The basic theory and the detailed steps of the algorithm of the first-order reliability method are discussed. For finding multiple design points, the method of adding bulge to the limit-state function is applied. With regard to the problem of envelope's reliability, the safety criterion and limit state function of the airship's envelope are analyzed. The mathematical model of the envelope's maximum stress is also presented. The reliability simulation of a stratospheric airship's envelope is taken as an example. Results of sensitivity analyses of the envelope are also obtained.

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“…A number of approaches can be found in the literature for the probabilistic or stochastic timeline analysis. The safety index (or the Beta reliability index) method, which was used in structural safety analysis in the 1960s [14] and systematically formulated later on by Hasofer and Lind [15], was introduced to fire safety analysis towards the end of the last century [16,17]. Hasofer and Beck [18] applied this method to analyze occupant safety in building fires.…”

Section: S4r: ð1þmentioning

confidence: 99%

A Risk-based Equivalence Approach to Fire Resistance Design for Buildings

He¹,

Grubits²

2010

Journal of Fire Protection Engineering

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This article presents a risk, or probability-based method for determining the residual fire resistance that is required when sprinklers are installed supplementary to building regulatory requirements. The concept of equivalence of a building design to a code-complying design on the basis of risk is introduced. The probability of failure is formulated, taking into account the probability density distributions for fire resistance of building structures and for fire severity. The sprinkler system is treated as a dual-exclusive-status system which has a bi-valued probability distribution. The probability density distribution for fire severity is moderated by the discrete reliability for sprinklers. A parametric study is conducted to demonstrate the sensitivity of the residual fire resistance to sprinkler reliability and fire severity distribution.

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Exact and Invariant Second-Moment Code Format

Cited by 2,054 publications

References 0 publications

Development of framework for in-vehicle collision warning system considering driver characteristics

Development of framework for in-vehicle collision warning system considering driver characteristics

Preliminary reliability analysis of a high-altitude airship’s envelope

A Risk-based Equivalence Approach to Fire Resistance Design for Buildings

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