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cumulative damage effect on debris slopes under frequent microseisms

Journal of Mountain Science 2022年第3期19卷 781-797页

作者： YANG Zhong-ping LI Shi-qi TIAN Xin HU Yuan-xin LI Wan-kun School of Civil Engineering Chongqing UniversityChongqing 400045China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400044China National Joint Engineering Research Center for Prevention and Control of Environmental Geological Hazards in the TGR Area(Chongqing) Chongqing 400045China Southwest Institute of Chemical Co. Ltd.Chengdu 610200China Extension Project Headquarters of Chongqing Jiangbei International Airport Chongqing 401120China Chongqing Luneng Development(Group)Co. Ltd.Chongqing 401120China

Debris slopes are widely distributed across the Three Gorges Reservoir area in China,and seasonal fluctuations of the water level in the area tend to cause high-frequency microseisms that subsequently induce landslides on such debris *** this study,a cumulative damage model of debris slope with varying slope characteristics under the effects of frequent microseisms was established,based on the accurate definition of slope damage *** cumulative damage behaviour and the mechanisms of slope instability and sliding under frequent microseisms were thus systematically investigated through a series of shaking table tests and discrete element numerical simulations,and the influences of related parameters such as bedrock,dry density and stone content were *** results showed that the instability mode of a debris slope can be divided into a vibration-compaction stage,a crack generation stage,a crack development stage,and an instability *** the action of frequent microseisms,debris slope undergoes the last three stages cyclically,which causes the accumulation to slide out in layers under the synergistic action of tension and shear,causing the slope to become *** are two sliding surfaces as well as the parallel tensile surfaces in the final instability of the debris *** the process of instability,the development trend of the damage accumulation curve remains similar for debris slopes with different ***,the initial vibration compaction effect in the bedrock-free model is stronger than that in the bedrock model,with the overall cumulative damage degree in the former being lower than that of the *** damage degree of the debris slope with high dry density also develops more slowly than that of the debris slope with low dry *** damage development rate of the debris slope does not always decrease with the increase of stone *** damage degree growth rate of the debris slope with the optimal stone

关键词： cumulative damage Debris slopes Frequent microseisms Shaking table tests Discrete element numerical simulation

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A cumulative damage model for predicting and assessing raveling in asphalt pavement using an energy dissipation approach

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Frontiers of Structural and Civil Engineering 2024年第6期18卷 949-962页

作者： Kailing DENG Duanyi WANG Cheng TANG Jianwen SITU Luobin CHEN School of Civil Engineering and Transportation South China University of TechnologyGuangzhou 510640China

Raveling is a common distress of asphalt pavements,defined as the removal of stones from the pavement *** predict and assess raveling quantitatively,a cumulative damage model based on an energy dissipation approach has been developed at the meso *** construct the model,a new test method,the pendulum impact test,was employed to determine the fracture energy of the stone-mastic-stone meso-unit,while digital image analysis and dynamic shear rheometer test were used to acquire the strain rate of specimens and the rheology property of mastic,*** of the model reveals that when the material properties remain constant,the cumulative damage is directly correlated with loading time,loading amplitude,and loading ***,damage increases with superimposed linear and cosine variations over time.A higher stress amplitude results in a more rapidly increasing rate of damage,while a lower load frequency leads to more severe damage within the same loading ***,an example of the application of the model has been presented,showing that the model can be utilized to estimate failure life due to *** model is able to offer a theoretical foundation for the design and maintenance of anti-raveling asphalt pavements.

关键词： asphalt pavement raveling cumulative damage dissipation energy theory

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cumulative damage effects of mainshock-aftershock sequences on RC-frame structures

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Earthquake Science 2019年第3期32卷 157-169页

作者： Lingxin Zhang Baijie Zhu Yunqin Xue Jialu Ma Institute of Engineering Mechanics China Earthquake AdministrationHarbin 150080China Key Laboratory of Earthquake Engineering and Engineering Vibration China Earthquake AdministrationHarbin 150080China Country Garden Holdings Company Limited Xinxiang 453000 China

Frequent aftershocks often follow a strong *** can significantly increase cumulative damage to a structure.A model of a five-story reinforced concrete frame structure was designed and a nonlinear mathematical model of the structure was developed to investigate the damage states resulting from different mainshock-aftershock ***-aftershock sequences consisting of one of three recorded mainshocks combined with one of five recorded aftershocks were created for input to the mathematical *** energy dissipation and the Park-Ang damage index were used as measures of cumulative damage to the *** results demonstrate that consideration of only the single mainshock ground motion in seismic building design can result in the design and construction of unsafe *** cumulative damage to a structure is caused by the combination of damage states resulting from the mainshock and the aftershock(s).

关键词： mainshock-aftershock RC frame cumulative damage Park-Ang damage index inelastic energy dissipation

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A NEW FATIGUE cumulative damage DYNAMIC INTERFERENCE MODEL

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Chinese Journal of Aeronautics 1994年第3期7卷 201-206页

作者： Liao Min Yang Qingxiong(Department of Aircraf t Engineering, Northwestern PolytechnicalUniversity, Xi’an. China, 7 10072)

On the basis of the statistical characteristics of fatigue cumulative damageand its critical value, a new dynamic interference model for reliability analysis is presented. Because the nonlinearity of fatigue damage accumulation is taken into account,this model is able to predict the fatigue reliability for random spectrum loadingconveniently. To verify the predicted results, a special fatigue expenment, in which thenumber of specimen is up to 101, is conducted using a fighter spectrum loading. It isshown that the new model is reliable, practicable and better than existing models.

关键词： fatigue life cumulative damage dynamic models statistical analysis re-liability analysis

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Master Curve Method of cumulative damage for Prediction of Service Life

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Journal of Beijing Institute of Technology 1999年第1期8卷 109-113页

作者：沈庭芳赵伯华北京理工大学应用物理系北京理工大学机电控制工程系

Aim To study the theory and method for the prediction of service life of solid rocket propellant grain. Methods With the aid of discontiguous diagnostic technology and method of accumulated damage using accelerated aging or heat air oven, the aging isotherms for void content versus aging time were determined. According to the principle of time temperature equivalence the viscoelastic master curve for the prediction of service life were obtained. Results and Conclusion The service life of HMX CMDB solid rocket propellant grain were obtained. Because the critical storage life is measured, the accuracy of predicting the service life of the grain has been increased greatly.

关键词： void content thermal aging cumulative damage service life

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Mechanical responses of anchoring structure under triaxial cyclic loading

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第2期16卷 545-560页

作者： Peng Wang Nong Zhang Qun Wei Xingliang Xu Guangzhen Cui Aoran Li Sen Yang Jiaguang Kan State Key Laboratory of Coal Resources and Safe Mining School of MinesChina University of Mining and TechnologyXuzhou221116China School of Civil Engineering Xuzhou University of TechnologyXuzhou221116China School of Mechanical Engineering Jiangsu University of TechnologyChangzhou213001China

Dynamic load on anchoring structures(AS)within deep roadways can result in cumulative damage and *** study develops an experimental device designed to test AS under triaxial *** device enables the investigation of the mechanical response,failure mode,instability assessment criteria,and anchorage effect of AS subjected to combined cyclic dynamic-static triaxial stress *** results show that the peak bearing strength is positively correlated with the anchoring matrix strength,anchorage length,and edgewise compressive *** bearing capacity decreases significantly when the anchorage direction is severely *** free face failure modes are typically transverse cracking,concave fracturing,V-shaped slipping and detachment,and spallation ***,when the anchoring matrix strength and the anchorage length decrease while the edgewise compressive strength,loading rate,and anchorage inclination angle increase,the failure intensity *** is determined by a negative tangent modulus of the displacement-strength curve or the continued deformation increase against the general downward *** cyclic loads,the driving force that breaks the rock mass along the normal vector and the rigidity of the AS are the two factors that determine roadway ***,a control measure for surrounding rock stability is proposed to reduce the internal driving force via a pressure relief method and improve the rigidity of the AS by full-length anchorage and grouting modification.

关键词： Triaxial stress Dynamic-static combination load Cyclic loading Anchoring structure(AS) cumulative damage

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Accumulated damage failure mechanism of anchoring structures under cyclic impact disturbance

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International Journal of Mining Science and Technology 2024年第12期34卷 1693-1709页

作者： Peng Wang Nong Zhang Jiaguang Kan Qun Wei Zhengzheng Xie Aoran Li Zhe He Jinghua Qi Xingliang Xu Changrui Duan School of Mines China University of Mining and TechnologyXuzhou 221116China Key Laboratory of Deep Coal Resource Mining(CUMT) Ministry of EducationChina University of Mining and TechnologyXuzhou 221116China School of Mechanical Engineering Jiangsu University of TechnologyChangzhou 213001China State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China State Key Laboratory for Safe Mining of Deep Coal and Environmental Protection Huainan 232001China

Cyclic impact induces ongoing fatigue damage and performance degradation in anchoring structures,ser-ving as a critical factor leading to the instability of deep *** paper takes the intrinsic spatio-temporal relationship of macro-microscopic cumulative damage in anchoring structures as the main thread,revealing the mechanism of bearing capacity degradation and progressive instability of anchoring structure under cyclic ***,a set of impact test devices and methods for the prestressed solid anchor bolt anchoring structure were developed,effectively replicating the cyclic impact stress paths in ***,cyclic impact anchoring structure tests and simulations were conducted,which clarifies the damage evolution mechanism of the anchoring *** loss follows a cubic decay func-tion as the number of impacts *** the same impact energy and pretension force,the impact resistance cycles of extended anchoring and full-length anchoring were increased by 186.7%and 280%,respectively,compared to end *** rate of internal damage accumulation is positively corre-lated with impact energy and negatively correlated with anchorage *** tensile cracks account for approximately 85%.Stress transmission follows a fluctuating *** to the extended anchoring,the maximum vibration velocity of the exposed end particles in the full-length anchoring was reduced by 59.31%.damage evolution exhibits a pronounced cumulative mutation ***,a three-media,two-interface mechanical model of the anchoring structure was *** has been clarified that the compressive stress,tensile stress,and oscillation effect arising from rapid transi-tions between compression and tension are the primary internal factors responsible for the degradation of the anchoring structure’s bearing ***,the progressive instability mechanism of the anchoring structure under cyclic impact was *** mutual feedback and su

关键词： Cyclic impact Anchoring structure cumulative damage Bearing capacity degradation Progressive instability

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Review of the energy-based design theory:Towards the application to self-centering systems

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Resilient Cities and Structures 2022年第1期1卷 80-97页

作者： Ge Song Ying Zhou T.Y.Yang State Key Laboratory of Disaster Reduction in Civil Engineering Tongji UniversityShanghai 200092China International Joint Research Laboratory of Earthquake Engineering Tongji UniversityShanghai 200092China Department of Civil Engineering The University of British ColumbiaVancouver V6T1Z4Canada

Self-centering systems exhibit superior performance during earthquake shaking with lower damage and less resid-ual *** the equivalent static force design procedure is the commonly used one for most structural systems for seismic applications,the cumulative damage and the effective duration of earthquakes cannot be explicitly considered,which has significantly affected the behaviors and post-earthquake performance of self-centering ***-based design theory(EBDT),which introduces the energy demand as the crit-ical parameter to establish relations with structural damage,has gained attention around the world in recent *** EBDT can provide comprehensive considerations for structural responses and damage in design procedures,especially for self-centering ***,few researches and actual energy design projects fo-cus on the use of EBDT for self-centering *** paper intends to present thorough review of several critical issues in ***,pivotal gaps that need to be further investigated towards the application of EBDT to self-centering systems are identified and discussed in the paper.

关键词： Self-centering systems Lower damage cumulative damage Duration of earthquakes Energy-based design theory

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Residual strength model for composite laminates

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Journal of Harbin Institute of Technology(New Series) 2010年第3期17卷 424-426页

作者：边文凤郭景哲杜善义 Postdoctoral Flow Station of Materials Science and Engineering Harbin Institute of Technology School of Civil Engineering Harbin Institute of Technology at Weihai

To research the approach of predicting composites fatigue life,the cumulative fatigue damage of fiber-reinforced plastic laminates(FRP) was investigated,and based on the complex exponential function,the residual strength model was obtained. This model can accurately describe the propagation of cumulative fatigue damage of FRP in three stages,especially in the initial stage and the ceasing stage. Applying this model in the experiment with two loading cycles,it can be found that the prediction result has good coincidence with experimental data. So a reliable residual strength model can be provided for studying the cumulative fatigue damage of FRP.

关键词： composite material residual strength fatigue life cumulative damage

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Fatigue Behavior of Plain Concrete Under Biaxial Compression: Experiments and Theoretical Model

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China Ocean Engineering 2003年第4期18卷 617-630页

作者：朱劲松宋玉普曹伟 State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian 116024 China

The effects of different lateral confinement stress on the fatigue behavior of and cumulative damage to plain concrete are investigated experimentally. Eighty 100 mm x 100 mm x 100 mm specimens of ordinary strength concrete are tested under constant- or variable-amplitude fatigue loading and lateral confinement pressure in two orthogonal directions. A fatigue equation is developed by modifying the classical Aas-Jakobsen S-N equation for taking into account the effect of the confined stress on fatigue strength of plain concrete. The results of variable-amplitude fatigue tests indicate that the linear damage theory proposed by Palmgren and Miner is unreasonable in the biaxial stress state. A nonlinear cumulative damage model that could model the effects of the magnitude and sequence of variable-amplitude fatigue loading and lateral confinement pressure is proposed on the basis of the evolution laws of the residual strains in the longitudinal direction during fatigue tests. The residual fatigue. life predicted by this model is found to be in good agreement with the results of the experimental research.

关键词： concrete variable-amplitude fatigue strength biaxial compression invariable lateral confinement cumulative damage life prediction

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