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An explicit compound Poisson process-based shock deterioration model for reliability assessment of aging structures

Journal of Traffic and Transportation Engineering(English Edition) 2022年第3期9卷 461-472页

作者： cao wang School of Civil Mining and Environmental EngineeringUniversity of WollongongWollongongNW 222Austalia Department of Civil Engineering Monash UniversityClaytonVic 3800Australia

Existing structures may suffer from resistance deterioration due to repeated attacks. The modeling of resistance deterioration is a critical ingredient in the reliability assessment and service life prediction of these degraded structures. In this paper, an explicit compound Poisson process-based model is developed to describe the shock deterioration of structural resistance, where the magnitude of each shock deterioration increment is modeled by a Gamma-distributed random variable. The moments(mean value and variance) and the distribution function of the cumulative shock deterioration are derived in a closed form, based on a proposed W-function. A method for the efficient calculation of the W-function is presented,which reduces to the Bessel type I function if the shock deterioration increment is exponentially distributed(a special case of Gamma distribution). The proposed shock deterioration model is applicable to either a stationary or a nonstationary Poisson process of random ***, the overall resistance deterioration is modeled as the linear combination of gradual and shock deteriorations, based on which the proposed model can be used in the timedependent reliability assessment of aging structures efficiently. A numerical example is presented to demonstrate the applicability of the proposed deterioration model by estimating the time-dependent reliability of an aging bridge. It is found that a smaller threshold for the degraded resistance leads to greater mean value and standard deviation of the time to failure,and this effect is enhanced by a smaller occurrence rate of the shock deterioration.

关键词： Structural reliability Resistance degradation Compound Poisson process Shock deterioration W-function

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Reliability-based design of lining structures for underground space against water seepage

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Underground Space 2021年第3期6卷 290-299页

作者： cao wang Department of Civil Engineering Monash UniversityClaytonVIC 3800Australia School of Civil Engineering The University of SydneySydneyNSW 2006Australia

The use of underground spaces is becoming increasingly important in this era of rapid urbanization and population ***,underground spaces are susceptible to water ingress,which may trigger the deterioration of their structural performance and reduce their *** highlights the importance of the proper design of lining structures with an emphasis on water *** study develops a reliability-based approach to guide the design of lining structures used for underground *** equivalent depth of water seepage is considered for a two-dimensional lining structure in the presence of the randomness and spatial correlation of the water seepage *** probabilistic behavior of the equivalent seepage depth that is derived serves as the basis for reliability-based design of lining structures.A simple design criterion is *** example is presented to demonstrate the applicability of the proposed approach.

关键词： Reliability-based design Spatial correlation Underground space Lining structure Water penetration Serviceability

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Sensitivity of tropical cyclone damage costs to integrated wind profile

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Journal of Ocean Engineering and Science 2021年第3期6卷 257-264页

作者： cao wang School of Civil Mining and Environmental EngineeringUniversity of WollongongWollongongNSW 2522Australia

The dramatic tropical cyclone(TC)damages in coastal areas around the world have gained significant attention from asset owners,policy makers and *** estimate of TC damage for a specific region of interest is informative of the preparedness and resilience of the area subjected to TC hazards,and thus should be conducted using a quantitative approach.A reasonable indicator of TC damage should incorporate not only the TC characteristics(e.g.,intensity,frequency and duration)but also the vulnerability of the TC-prone *** this paper,a new indicator is proposed to measure the TC threat,which takes into account both the TC characteristics and the vulnerability of the *** indicator has two forms:the first one considers the maximum wind speed only and the second incorporates the integrated wind speed *** historical damage scenarios along the US East Coast,as well as those in Hong Kong,China,are examined to demonstrate the applicability of the proposed *** show that the proposed indicator is capable of representing the impact of TC wind field profile on the TC damage *** proposed indicator could be further used to project the future TC damages for areas subjected to TC hazards.

关键词： Adaptive potential damage index Damage costs Integrated wind profile Tropical cyclone Wind speed.

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Diagonally loaded SMI algorithm based on inverse matrix recursion

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Journal of Systems Engineering and Electronics 2007年第1期18卷 160-163页

作者： cao Jianshu wang Xuegang Coll. of Electronic Engineering Univ. of Electronic Science and Technology Chengdu 610054 P. R. China

The derivation of a diagonally loaded sample-matrix inversion （LSMI） algorithm on the busis of inverse matrix recursion （***-IMR algorithm） is conducted by reconstructing the recursive formulation of covariance matrix. For the new algorithm, diagonal loading is by setting initial inverse matrix without any addition of computation. In addition, a corresponding improved recursive algorithm is presented, which is low computational complexity. This eliminates the complex multiplications of the scalar coefficient and updating matrix, resulting in significant computational savings. Simulations show that the LSMI-IMR algorithm is valid.

关键词： Robust adaptive beamforming Space-time adaptive processing (STAP) Diagonal loading Inverse matrix recursion

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New recursive algorithm for matrix inversion

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Journal of Systems Engineering and Electronics 2008年第2期19卷 381-384页

作者： cao Jianshu wang Xuegang Coll. of Electronic Engineering Univ. of Electronic Science and Technology of China Chengdu 610054 P. R. China

To reduce the computational complexity of matrix inversion, which is the majority of processing in many practical applications, two numerically efficient recursive algorithms （called algorithms I and II, respectively） are presented. Algorithm I is used to calculate the inverse of such a matrix, whose leading principal minors are all nonzero. Algorithm II, whereby, the inverse of an arbitrary nonsingular matrix can be evaluated is derived via improving the algorithm I. The implementation, for algorithm II or I, involves matrix-vector multiplications and vector outer products. These operations are computationally fast and highly parallelizable. MATLAB simulations show that both recursive algorithms are valid.

关键词： recursive algorithm matrix inversion matrix-vector product leading principal minor (LPM).

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Upcrossing-based time-dependent resilience of aging structures

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Resilient Cities and Structures 2024年第3期3卷 20-27页

作者： cao wang School of Civil and Environmental Engineering University of Technology SydneyUltimoNSW 2007Australia

The time-dependent resilience of an in-service aging structure provides quantitative measure of the structural ability to prepare for,adapt to,withstand and recover from disruptive *** models have been proposed in the literature to evaluate the resilience of aging structures subjected to discrete load processes,which are,however,not applicable to handle resilience problems considering continuous load *** this paper,a new method is developed to evaluate the time-dependent resilience of aging structures subjected to a continuous load *** proposed method serves as the complement of the existing resilience models addressing discrete load processes,and takes into account the aging effects of the structural resistance/capacity and the nonstationarity in loads as a result of climate change.A structure suffers from a damage state upon the occurrence of an upcrossing of the load effect with respect to the resistance/capacity,leading to the reduction of the performance function,followed by a recovery process that restores the *** proposed method enables the time-dependent resilience to be evaluated via a closed form *** is also revealed that,the proposed resilience model takes an extended form of the existing formula for upcrossing-based time-dependent reliability,thus establishing a unified framework for the two *** applicability of the proposed method is demonstrated through examining the time-dependent resilience of a residential building subjected to wind *** effects of key factors on resilience,including the nonstationarity and correlation structure of the load process,as well as the resistance/capacity deterioration scenario,are investigated through an *** particular,the structural resilience would be overestimated if ignoring the potential impacts of climate change,which is a relatively non-conservative evaluation.

关键词： Time-dependent resilience Stochastic load process Multiple damage states Upcrossing Closed form solution

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A generalized index for functionality-sensitive resilience quantiﬁcation

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Resilient Cities and Structures 2023年第1期2卷 68-75页

作者： cao wang School of Civil MiningEnvironmental and Architectural EngineeringUniversity of WollongongWollongongNSW 2522Australia

The resilience index based on the integral of functionality/performance function within a time interval of interest has been widely used in the ***,it cannot fully reﬂect the sensitivity of the resilience of the object(e.g.,structure or system)to the variation of *** this paper,a generalized index is proposed to measure the resilience of structures and systems that is sensitive to the instantaneous functionality,as reﬂected by a generating function involved in the proposed resilience *** mathematical properties of the proposed resilience model are *** is proven that,the proposed index varies within[0,1],and is a monotone *** the generating function is a power function with α being the exponent(called α-fairness function),the additivity property(i.e.,superadditivity,additivity,and subadditivity)of the resilience index is dependent on the value of α.It is also observed that the existing resilience index is a special case of the proposed one.A byproduct is that,with a properly selected generating function,the time-dependent reliability problem of an aging structure can also be described by the proposed resilience *** applicability of the proposed resilience model is demonstrated through four examples.

关键词： Resilience index Functionality-sensitive Monotone measure

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Organocatalytic Oxidative Amidation of Aldehydes with Tetrazoles to Construct 2,5-Diaryl 1,3,4-Oxadiazoles

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Chinese Journal of Chemistry 2015年第11期33卷 1239-1243页

作者： Jing cao Liang wang School of Petrochemical Engineering Changzhou University Changzhou Jiangsu 213164 China

A practical and metal-flee oxidative amidation of aldehydes with tetrazoles into 1,3,4-oxadiazoles has been de- veloped by employing tetrabutylammonium iodide （TBAI） as catalyst and tert-butyl hydroperoxide （TBHP） as oxidant. A wide range of 2,5-disubstituted 1,3,4-oxadiazoles can be conveniently generated in moderate to good yields. Gram-scale reaction was also realized in this catalytic system.

关键词： 1,3,4-oxadiazoles oxidative amidation tetrazoles aldehydes organocatalysis

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Synthesis,Structure and Properties of Layered Phosphide Nitrides AkTh_(2)Mn_(4)P_(4)N_(2)(Ak=Rb,Cs)

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Chinese Journal of Chemistry 2021年第10期39卷 2873-2880页

作者： Bai-Zhuo Li Si-Qi Wu Zhi-Cheng wang cao wang Guang-Han cao Department of Physics Zhejiang Province Key Laboratory of Quantum Technology and DevicesInterdisciplinary Center for Quantum Informationand State Key Lab of Silicon MaterialsZhejiang UniversityHangzhouZhejiang310027 China School of Physics&Optoelectronic Engineering Shandong University of TechnologyZiboShandong 255000China Collaborative Innovation Centre of Advanced Microstructures Nanjing UniversityNanjingJiangsu210093 China

Main observation and conclusion We report the design,synthesis,structure,and properties of two complex layered phosphide nitrides,AkTh_(2)Mn_(4)P_(4)N_(2)(Ak=Rb,Cs),which contain anti-fluorite-type[Mn_(2)P_(2)]bilayers separated by fluorite-type[Th_(2)N_(2)]layers as a result of the intergrowth between AkMn2P2 and *** new compounds are featured with an intrinsic hole doping associated with the interlayer charge transfer and a built-in chemical pressure from the[Th_(2)N_(2)]layers,both of which are reflected by the changes in the lattice and the atomic position of *** measurements of magnetic susceptibility,electrical resistivity,and specific heat indicate existence of local moments as well as itinerant electrons in relation with d-p *** expected dominant antiferromagnetic interactions with enhanced d-p hybridizations were demonstrated by the first-principles calculations only when additional Coulomb repulsions are *** density of states at the Fermi level derived from the specific-heat analysis are 3.5 and 7.5 times of the calculated ones for Ak=Rb and Cs,respectively,suggesting strong electron correlations in the title compounds.

关键词： Intercalations Synthetic methods Physical properties Phosphide nitrides Electronic structure

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Leader-follower Optimal Selection Method for Distributed Control System in Active Distribution Networks

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CSEE Journal of Power and Energy Systems 2024年第1期10卷 314-323页

作者： Jian Le Liangang Zhao cao wang Qian Zhou Yang wang School of Electrical Engineering and Automation Wuhan UniversityWuhan 430072China

Aiming at the shortcomings of a traditional centralized control in an active distribution network(AND),this paper proposes a leader-follower distributed group cooperative control strategy to realize multiple operation and control tasks for an *** distributed information exchange protocols of the distributed generation(DG)group devoted to node voltage regulation or exchange power control are developed using a DG power utilization ratio as the consensus *** these bases,this study further investigates the leader optimal selection method for a DG group to improve the response speed of the distributed control ***,a single or multiple leader selection model is established to minimize the constraints of the one-step convergence factor and the number of leaders to improve the response speed of the distributed control *** simulation results of the IEEE 33 bus standard test system show the effectiveness of the proposed distributed control *** addition,the response speed of a DG control group can be improved effectively when the single or multiple leaders are selected optimally.

关键词： Active distribution1network consensus algorithm leader-follower system mixed-integer semidefinite programming optimal distributed control

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