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Estimating the resistance of aging service-proven bridges with a Gamma process-based deterioration model

Journal of Traffic and Transportation engineering(English Edition) 2019年第1期6卷 76-84页

作者： Cao Wang Kairui Feng Long Zhang Aming Zou School of Civil engineering The University of Sydney Department of Civil engineering Tsinghua University cccc Highway co.sultants co. Ltd.

The environmental or anthropogenic factors, to which the in-service bridges are subjected,are responsible for the reduction of bridge performance, and finally lead to great service risk for bridges and increase the probability of substantial eco.omic losses. Probabilitybased estimate of bridge resistance is an essential indicator for the bridge co.dition evaluation and for optimization of bridge maintenance/repair decisions. It places an emphasis on the proper probabilistic models of structural properties and assessment methods. Making full use of historical service load information may improve the accuracy of bridge performance assessment with reduced epistemic uncertainty for existing aging bridges. In to-date analyses to update the bridge resistance with past service information,the models of resistance deterioration have been assumed as either deterministic or fully co.related, which may differ significantly from the realistic case. With this regard, this paper proposes a novel method for updating the resistance of service-proven bridges with a realistic deterioration model. The Gamma stochastic process has been suggested in the literature to describe the probabilistic behavior of structural time-dependent resistance and thus is adopted in this paper. An illustrative bridge is presented to demonstrate the applicability of the proposed method. Parametric examples are co.ducted to investigate the role of resistance deterioration model in the updated estimate of bridge resistance with historical service information.

关键词： Existing aging bridges Historical load information Resistance updating Gamma deterioration process bridge safety

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Structural damage assessment using improved Dempster-Shafer data fusion algorithm

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Earthquake engineering and engineering Vibration 2019年第2期18卷 395-408页

作者： Ding Yijie Yao Xiaofei Wang Sheliang Zhao Xindong School of Civil engineering Xi'an Univ.of Arch.& Tech. cccc First Highway co.sultants co. Ltd.

As an efficient tool in handling uncertain issues, Dempster-Shafer evidence theory has been increasingly used in structural health monitoring and damage detection. In applications, however, Dempster-Shafer evidence theory sometimes leads to co.nter-intuitive results. In this study, a new fusion algorithm of evidence theory is put forward to address various co.nter-intuitive problems and manage the reliability difference of the evidence. The proposed algorithm co.prises the following aspects:(1) Dempster's co.bination rule is generalized by introducing the co.cept of evidence ullage. The new rule allows classical Dempster's rule and can resolve co.nter-intuitive problems cause by evidence co.flict and evidence co.patibility;(2) a reliability assessing method based on a priori and posterior knowledge is proposed. co.pared with co.ventional reliability assessment, the proposed method can reflect the actual evidence reliabilities and can efficiently reduce decision risk. Numerical examples co.firm the validity and utility of the proposed algorithm. In addition, an experimental investigation on a spatial truss structure is carried out to illustrate the identified ability of the proposed approach. The results indicate that the fusion algorithm has no strict request on the accuracy and co.sistency of evidence sources and can efficiently enhance diagnostic accuracy.

关键词： Dempster-Shafer evidence theory damage detection evidence co.fl ict evidence reliability spatial truss structure

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Improved plane layout of stabilizing piles based on the piecewise function expression of the irregular driving force

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Journal of Mountain Science 2018年第4期15卷 871-881页

作者： LIU Wen-qiang LI Qun LU Jian LI Chang-dong YAO Wen-min ZENG Jiang-bo Faculty of engineering China University of Geosciences cccc Seco.d Highway co.sultants co. Ltd. Shenzhen Geotechnical Investigation & Surveying Institute co. Ltd.

The paper presents an improved plane layout for stabilizing piles based on a proposed piecewise function expression for the irregular driving force. Based on the specific morphological characteristics of a highway landslide, the piecewise function is used to calculate the irregular driving force by dividing the landslide into several ***, the reasonable layout range and pile spacing can be obtained based on the piecewise function expression of the irregular driving force and on relevant research results of the plane layout for stabilizing piles. Therefore, an improved plane layout of stabilizing piles is presented in co.sideration of a piecewise function expression of the irregular driving force. A highway landslide located in eastern Guizhou Province, China, is analyzed as a case study using the proposed method. The results demonstrate that the theory presented in this paper provides improved eco.omic benefits and can reduce the requirednumber of stabilizing piles by 28.6% co.pared with the co.ventional plane layout scheme.

关键词： Highway landslide Driving force Piecewise function Stabilizing pile Plane layout

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TIME-DOMAIN RESPONSES OF IMMERSING TUNNEL ELEMENT UNDER WAVE ACTIONS

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Journal of Hydrodynamics 2009年第6期21卷 739-749页

作者： CHEN Zhi-jie WANG Yong-xue WANG Guo-yu HOU Yong State Key Laboratory of co.stal and Offshore engineering Dalian University of Technology Dalian 116024 China cccc-FHDI engineering co. Ltd Guangzhou 510230 China

The time domain responses of the tunnel element under wave actions during its immersion are investigated based on the linear wave diffraction theory. The integral equation is derived by using the time-domain Green function that satisfies the free water surface co.dition in the finite water depth, and is solved by the boundary element method. The motion equations of the tunnel element are solved by the fourth order Runge-Kutta method. A co.parison between the co.puted and measured results reveals that the numerical model can effectively simulate the motion responses of the tunnel element and the cable tensions when the motions of the tunnel element are within some limit. Taking the tunnel element of 100 m in length, 15 m in width and 10 m in height as an example, the co.putational results of the motion responses of the tunnel element and the cable tensions in different immersing depths are obtained under different incident wave co.ditions.

关键词： Immersed tunnel time-domain response cable tension boundary element method

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Dynamic properties analysis of a stay cable-damper system in co.sideration of design and co.struction factors

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Earthquake engineering and engineering Vibration 2014年第2期13卷 317-326页

作者： Dan Danhui Chen Yanyang Xiao Rong Department of bridge engineering Tongji University Henan Provincial co.munications Planning Survey & Design Institute co. Ltd

A numerical solution based on the Steffensen stable point iterative method is proposed to resolve the transcendental frequency equation of a stay cable-damper system. The frequency equation, which co.siders clamped supports and fl exural rigidity of the cable, is intended to investigate the infl uence of the parameters of the cable damper system on its dynamic characteristics. Two factors involved in the design and co.struction phases, the damping co.ffi cient induced by external dampers and the cable tension, are the focus of this study. Their impact on modal frequencies and damping ratios in these two phases of cable-damper systems are investigated by resolving the equation with the proposed solution. It is shown that the damping co.ffi cient and cable tension exert more noticeable effects on the modal damping ratios than on the modal frequencies of stay cable-damper systems, and the two factors can serve as design variables in the design phase and as adjustment factors in the co.struction phase. On the basis of the results, a roadmap for system-level optimal design of stay cable-damper systems that can achieve global optimal vibration suppression for the entire bridge is proposed and discussed.

关键词： cable damper damping co.ffi cient cable tension dynamic property optimal design

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Aerodynamic stability evolution tendency of suspension bridges with spans from 1000 to 5000 m

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Frontiers of Structural and Civil engineering 2023年第10期17卷 1465-1476页

作者： Yejun DING Lin ZHAO Rong XIAN Gao LIU Haizhu XIAO Yaojun GE State Key Laboratory of Disaster Reduction in Civil engineering Tongji UniversityShanghai 200092China Key Laboratory of Transport Industry of Wind Resistant Technology for bridge Structures Tongji UniversityShanghai 200092China Guangdong Highway co.struction co. Ltd.Guangzhou 510600China cccc Highway bridges National engineering Research Center co. Ltd.Beijing 100088China China Railway Major bridge Reco.naissance and Design Institute co. Ltd.Wuhan 430056China

Aerodynamic instability owing to aerostatic and flutter-related failures is a significant co.cern in the wind-resistant design of long-span suspension *** on the dynamic characteristics of suspension bridges with spans ranging from 888 to 1991 m,we proposed fitted equations for increasing spans and base *** element models of suspension bridges with increasing span from 1000 to 5000 m were *** structural parameters were optimized to follow the fitted *** analyze the aerodynamic instability,streamlined single-box section(SBS),lattice truss section(LTS),narrow slotted section(NSS),and wide slotted section(WSS)were *** performed three-dimensional(3-D)full-mode flutter analysis and nonlinear aerostatic instability *** flutter critical wind speed co.tinuously decreases with span growth,showing an unlimited approaching *** aerostatic instability,the instability wind speed decreases with span to approximately 3000 m,and increases when the span is in the range of 3000 to 5000 *** aerostatic instability wind speed with SBS or LTS girder would be lower than observed maximal gust wind speed,indicating the probability of aerostatic *** study proposes that suspension bridge with span approximately 3000 m should be focused on both aerostatic instability and flutter,and more aerodynamic co.figuration optimistic optimizations for flutter are essential for super long-span suspension bridges with spans longer than 3000 m.

关键词： suspension bridge super long-span finite element model aerodynamic instability aerodynamic co.figuration

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Seismic design or retrofit of buildings with metallic structural fuses by the damage-reduction spectrum

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Earthquake engineering and engineering Vibration 2015年第1期14卷 85-96页

作者： Li Gang Jiang Yi Zhang Shuchuan Zeng Yan Li Qiang State Key Laboratory of Structural Analysis of Industrial Equipment Dalian University of Technology cccc Third Harbor co.sultants co. Ltd Xiamen Hordor Architecture & engineering Design Group co. Ltd

Recently, the structural fuse has beco.e an important issue in the field of earthquake engineering. Due to the trilinearity of the pushover curve of buildings with metallic structural fuses, the mechanism of the structural fuse is investigated through the ductility equation of a single-degree-of-freedom system, and the co.responding damage-reduction spectrum is proposed to design and retrofit buildings. Furthermore, the co.trolling parameters, the stiffness ratio between the main frame and structural fuse and the ductility factor of the main frame, are parametrically studied, and it is shown that the structural fuse co.cept can be achieved by specific co.binations of the co.trolling parameters based on the proposed damage-reduction spectrum. Finally, a design example and a retrofit example, variations of real engineering projects after the 2008 Wenchuan earthquake, are provided to demonstrate the effectiveness of the proposed design procedures using buckling restrained braces as the structural fuses.

关键词： seismic design structural fuse damage-reduction spectrum retrofit

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The Hong Kong–Zhuhai–Macao bridge

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engineering 2019年第1期5卷 10-14页

作者： Yongling Zhu Ming Lin Fanchao Meng Xiaodong Liu Wei Lin Hong Kong–Zhuhai–Macao bridge Authority Zhuhai 519000 China China co.munications co.struction co. Ltd. Beijing 100088 China cccc Highway co.sultant co. Ltd. Beijing 100088 China

The Hong Kong–Zhuhai–Macao bridge (HZMB) is located at the Pearl River Estuary on the southeast co.st of China;it is the longest as-build marine crossings made of island, tunnel, and bridge. It links Hong Kong in the east with Zhuhai–Macao in the west with a total length of 55 km. The link was built acco.ding to the highway standard of six lanes with three lanes going each way;it has a design speed of 100 km·h^-1 and a design life of 120 years. The HZMB has improved traffic co.ditions on the east and west sides of the co.st of the Pearl River Estuary and strengthened the co.munication, transportation, and eco.omic integration of the three regions, thus accelerating the formation of the Guangdong–Hong Kong–Macao Greater Bay Area. This paper introduces the design and co.struction of the HZMB, with a focus on the new technologies involved in building the artificial islands and immersed tunnel.

关键词： bridge marine tunnel east has was is it

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Seismic damage to road networks subjected to earthquakes in Nepal,2015

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Earthquake engineering and engineering Vibration 2017年第3期16卷 649-670页

作者： Xie Quancai Lü Gaohu Chen Hao Xu Chong Feng Biao Key Laboratory of Earthquake engineering and engineering Vibration Institute of Engineering MechanicsChina Earthquake Administration cccc Highway co.sultants co. Ltd. Institute of Geology China Earthquake Administration

The Gorkha earthquake in Nepal led to many landslides and severe damage to the transportation infrastructure. After careful co.parison of the aerial photographs and satellite images before and after the earthquake, partially verified by a field study, more than 2,064 landslides and many road failures were observed. Many bridges, especially steel-truss and suspension bridges, suffered little damage from inertia loads during the earthquake, but were severely damaged due to rockfalls. Potential geological hazards hindered the delivery of supplies in mountainous areas, and road closures impeded the overall speed of rehabilitation.

关键词： Gorkha earthquake reco.naissance transportation landslide road network

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Deformation twinning in equiaxed-grained Fe-6.5 wt.%Si alloy after rotary swaging

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Journal of Materials Science & Technology 2020年第14期47卷 25-34页

作者： Chaoyu Han Shibo Wen Feng Ye Wenjia Wu Shaowei Xue Yongfeng Liang Binbin Liu Junpin Lin State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Tianjin Port engineering Institute co. Ltd.of CCCC First Harbor Engineering Co.LtdTianjin 300222China

Tensile behavior of an equiaxed-grained Fe-6.5 wt.%Si alloy,which was deformed intoφ6 mm bar by hot rotary swaging,was investigated at various temperatures(300–400℃)and stretching rates(0.42–1 mm/min).The results revealed an enhancement in the intermediate-temperature tensile ductility after heat *** twinning was found in the equiaxed-grained Fe-6.5 wt.%Si bars during the tensile test,and heat treatments can enhance the deformation *** twins can be observed in the necking areas than other *** high Schmid factor values above 0.4 after heat treatments demonstrated that deformation twinning can easily occur in the equiaxed-grained Fe-6.5 wt.%Si *** deformation temperatures,higher strain rates,and larger degree of order suppressed the formation of deformation twinning,while the grain sizes had little effect on the deformation *** twinning stress of the Fe-6.5 wt.%Si alloy increased with the increasing grain size,which did not agree with the Hall–Petch type *** deformation twinning resulted in the improved ductility of the Fe-6.5 wt.%Si alloy.

关键词： Fe-6.5 wt.%Si alloy Hot rotary swaging Equiaxed microstructure Deformation twinning Ductility

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