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Injury severities from heavy vehicle accidents:An exploratory empirical analysis

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Journal of Traffic and Transportation Engineering(English Edition) 2022年第6期9卷 991-1002页

作者： Hamsa Zubaidi Ali Alnedawi Ihsan Obaid Masoud Ghodrat Abadi Roads and Transport Engineering Department College of EngineeringUniversity of Al-QadisiyahAl-DiwaniyaIraq Investment Commission Endowment BaghdadIraq Department of Civil Engineering California State UniversitySacramentoCA 95819USA

Despite the importance of heavy vehicles in Australia’s transportation system,little is known on the factors influencing injury severity from accidents involving a single heavy *** vehicular crashes have been one of the main causes of fatal injuries in Australia,and this raises safety concerns for transport authorities,insurance companies,and emergency *** there have been several potential attempts to identify the factors contributing to heavy vehicle crashes and injury severity,it is still necessary to reduce the number of traffic crashes and lower the fatality rate involving heavy *** aims of this study were investigating the effects of heavy trucks’presence in accidents on the injury severity level sustained by the vehicle driver and detecting the contributing factors that lead to specific injury severity ***-and random-parameter ordered probit and logit models were applied for predicting the likelihood of three injury severity categories severe,moderate,and no injury based on data from crashes caused by heavy trucks in Victoria,Australia in *** results showed that the random-parameter ordered probit model performed better than the other models *** variables(i.e.,factors)were found to be significant,and 12 of them were found to have random parameters that were normally *** some of the investigated factors had different effects on the type of injury severity in Australia,this paper does not recommend generalizing the findings from other case *** on the findings,Victoria state authorities can have insight and enhanced understanding of the specific factors that lead to various types of injury severity involving heavy ***,the safety of all road users,including heavy vehicle drivers,can be enhanced.

关键词： Heavy vehicle Injury severity random parameter Ordered probit model

Hopf bifurcation of nonlinear system with multisource stochastic factors

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Theoretical & Applied Mechanics Letters 2023年第2期13卷 93-97页

作者： Xinyu Bai Shaojuan Ma Qianling Zhang Qiyi Liu School of Mathematics and Information Science North Minzu UniversityYinChuanNingXia 750021China

The article mainly explores the Hopf bifurcation of a kind of nonlinear system with Gaussian white noise excitation and bounded random ***,the nonlinear system with multisource stochastic fac-tors is reduced to an equivalent deterministic nonlinear system by the sequential orthogonal decomposi-tion method and the Karhunen-Loeve(K-L)decomposition ***,the critical conditions about the Hopf bifurcation of the equivalent deterministic system are *** the same time the influence of multisource stochastic factors on the Hopf bifurcation for the proposed system is ***,the theorical results are verified by the numerical simulations.

关键词： Multisource stochastic factors Gaussian white noise K-L decomposition Hopf bifurcation random parameter

Effect of randomness of Interfacial Properties on Fracture Behavior of Concrete Under Uniaxial Tension

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Acta Mechanica Solida Sinica 2018年第2期31卷 174-186页

作者： Chuanchuan Zhang Xinhua Yang Hu Gao School of Civil Engineering and Mechanics Huazhong University of Science and Technology Wuhan 430074 China Hubei Key Laboratory of Engineering Structural Analysis and Safety Assessment 1037 Luoyu Road Wuhan 430074 China

Interfacial transition zones （ITZs） between aggregates and mortar are the weakest parts in concrete. The random aggregate generation and packing algorithm was utilized to create a two-phase concrete model, and the zero-thickness cohesive elements with different normal distribution parameters were used to model the ITZs with random mechanical properties. A number of uniaxial tension-induced fracture simulations were carried out, and the effects of the random parameters on the fracture behavior of concrete were statistically analyzed. The results show that, different from the dissipated fracture energy, the peak load of concrete does not always obey a normal distribution, when the elastic stiffness, tensile strength, or fracture energy of ITZs is normally distributed. The tensile strength of the ITZs has a significant effect on the fracture behavior of concrete, and its large standard deviation leads to obvious diversity of the fracture path in both location and shape.

关键词： Interface transition zone random parameter Concrete Fracture