检索结果-南通市图书馆

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 slopes.In 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 variables.The 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 discussed.The 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 stage.Under 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 destabilised.There are two sliding surfaces as well as the parallel tensile surfaces in the final instability of the debris slope.In the process of instability,the development trend of the damage accumulation curve remains similar for debris slopes with different parameters.However,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 latter.The damage degree of the debris slope with high dry density also develops more slowly than that of the debris slope with low dry density.The damage development rate of the debris slope does not always decrease with the increase of stone content.The damage degree growth rate of the debris slope with the optimal stone content is the lowest,and the increase or decre

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

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Mechanical responses of anchoring structure under triaxial cyclic loading

引用

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 failure.This study develops an experimental device designed to test AS under triaxial loads.The 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 paths.The results show that the peak bearing strength is positively correlated with the anchoring matrix strength,anchorage length,and edgewise compressive strength.The bearing capacity decreases significantly when the anchorage direction is severely inclined.The free face failure modes are typically transverse cracking,concave fracturing,V-shaped slipping and detachment,and spallation detachment.Besides,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 rises.Instability is determined by a negative tangent modulus of the displacement-strength curve or the continued deformation increase against the general downward trend.Under 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 stability.Finally,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

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

引用

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 mainshock.They 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 sequences.Mainshock-aftershock sequences consisting of one of three recorded mainshocks combined with one of five recorded aftershocks were created for input to the mathematical model.Inelastic energy dissipation and the Park-Ang damage index were used as measures of cumulative damage to the structure.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 buildings.Total 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

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A NEW FATIGUE cumulative damage DYNAMIC INTERFERENCE MODEL

引用

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

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Residual strength model for composite laminates

引用

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

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

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

引用

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

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Step-by-Step Building of a Four Dimensional Fatigue Compatible Regression Model including Frequencies

引用

Open Journal of Statistics 2021年第6期11卷 1072-1096页

作者： Enrique Castillo Alfonso Fernández-Canteli Sergio Blasón Golta Khatibi Bernhard Czerny Mohammad Zareghomsheh Spanish Royal Academy of Engineering Madrid Spain Spanish Royal Academy of Sciences Madrid Spain Department of Construction and Engineering Manufacturing Polytechnic School of Gijón University of Oviedo Campus de Viesques Asturias Spain Bundesanstalt für Materialforschung und Prüfung (BAM) Berlin Germany Department 9-Component Safety Division 9.4 Weld Mechanics Berlin Germany Christian Doppler Laboratory for Lifetime and Reliability of Interfaces in Complex Multi-Material Electronics Chemical Technologies and Analytics Vienna Austria

The purpose of this research is to develop a model, with emphasis on compatibility conditions and model building, valid for high cycle fatigue design components such as wind turbines, automobiles, high speed railways and aeronautical material. In this work, we have added the frequency as one more variable to an existing fatigue model that already includes maximum stress, stress ratio and lifetime. As a result, a model and estimation method has been proposed and a random variable V has been identified, which, allows the accumulated damage and the probability of failure to be assessed for any load history in terms of stress levels, stress ranges and frequencies. Finally, the model is validated using a large set of real experimental data.

关键词： Compatibility Conditions cumulative damage Frequency Effect Functional Equations Regression Model

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Reliability Simulation for a Missile Tank Under Random Loading

引用

International Journal of Plant Engineering and Management 2001年第3期6卷 130-135页

作者： JIANG Hong kai, TIAN Hong bo, ZHANG Shi yang, CHEN Jia zhao The Second Artillery Engineering College, Xi’an 710025, P.R.China The Second Artillery Engineering College Xi′an 710025 P. R. China

This paper presents a Monte-Carlo simulation method to calculate intensity reliability for a missile tank under random loading. The cumulative damage mathematical model is established , and it adopts a direct simulation method to present random loading and o-riginal intensity for a missile tank. It can effectively predict intensity reliability for a missile tank in the environment of transport and flight.

关键词： random loading missile tank cumulative damage reliability

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Application of New Fatigue damage Theory in Reliability Design of Automobile Components

Application of New Fatigue Damage Theory in Reliability Desi...

引用

2021中国汽车工程学会年会暨展览会

作者： Wang Wenge Lu Yanhui FAW Jiefang Automotive Co. Ltd. College of Automotive Engineering Jilin University

A new cumulative fatigue damage theory is established in this paper.Under the premise that the known conditions and the convenience of application are the same as Miner theory,which is the most widely used at present,the new theory successfully solves two basic problems of fatigue:（Measure the load spectrum block of the component in a certain period of working time.①Calculate the failure probability of the component when it works to the specified time.That is,the failure probability of the component subjected to the specified cycle period of the load spectrum block.② Calculate the working time of the component under the specified failure probability.That is,the number of cycles of the load spectrum block that the component can bear under the specified failure probability）.The new theory has been applied to the fatigue life prediction of various automobile load bearing components,and satisfactory results have been obtained.

关键词： fatigue life damage degree cumulative damage failure criterion

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：