福建某港工程施工总体施工部署及工作船码头施工组织设计翻译.docx
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1、Description of Concrete Durability Damage ProcessAbstract: Based on the damage mechanics, the concrete damage grade of relative stable environment in measurable spatial is constructed in this paper, and the concrete damage evolving model and corresponding failure rule is constructed based on the dam
2、age grade fore-defined. Therefore, the concrete health status and the residual life-span can be assessed according to the measured damage grade. It is propitious to drive the development of concrete durability assessment and life-span forecast. Its feasibility of concrete damage process description
3、and health assessment is validated with the example in this paper, in which the damage state is described with the ultrasound velocity attenuation, and the freeze-thaw process is regarded as the concrete durability degradation influeneing factor to reflect the concrete durability degradation process
4、.Keywords: concrete, durability damage, life-span assessment, health monitoring, ultrasonic velocity0 .IntroductionIn city infrastructures reconstruction , concrete structures are common .So it is necessary to carry out the research on the concrete structure health monitoring,structural diagnosis an
5、d life-span evaluationThe current health monitoring and structural diagnosis method of concrete structures primarily contain two major two types,one is to supervise and control them timely at service,then pass the collection of the structural dynamic displacements,velocity and acceleration,via numer
6、ical analysis to the monitor and evaluate continuously the health progress of the structure; another is to periodically or aperiodically check and measure the structure non-destructively,and to analyzethe examination data to assess the structure progressively. Each of them has its superiority and dr
7、awbacks which should be considered in the further research and development.Except the paroxysmal process,the breakage of concrete structure is a gradual process,and the structural health deterioration should be closely linked with this processThe concrete structural gradual failure exhibits mainly i
8、ts durability failure .Concretely,it includes the concrete materiaI durability deterioration ,reinforcement steel material durability deterioration,and the bond strength between concrete and reinforcement lost graduallyThe latter two factors are interrelated closely with the concrete materiaI durabi
9、lity deteriorationNo matter which one results in the concrete material durability deterioration,in the macroscopic view it exhibits as the internal structures loosen ,defects initiation, cracks propagationDetecting and catching the concrete damage,constructing the concrete damage evolving model,then
10、 the durability deterioration of concrete structure can be monitored,and the assessment on the remaining life-span of concrete structures wil1 be realizedSuppose concrete be an isotropic system including random tiny cracksTaking the tiny unit in the concrete construction as the research object,at th
11、e initial moment,the damage defects on the tiny unit are ,and the external stress on the unit is At arbitrary moment ,the damage defects in the tiny unit are ,and the outside stress on the unit is shown in Fig.1. For the concrete gradual breakage are the results of unstable crack propagation of the
12、defects in the unit which arise from the influence of various factors,we regard the dispersive defects as a uniform field,and evaluate whole the effects of all defectsSo the materia1 damage grade can be defined asWhere, is the time parameter,describes the inner resisting state of the concrete at arb
13、itrary momentis the damage state of the concrete unit at the initial momentObviously,the structura1 damage grade D reaches:Because the force field and the corresponding displacement field of the tiny unit is related to its inner resisting state,via the damage mechanics method the relationship among
14、the concrete damage grade,the leading factor and the material parameter can be establishedNamelywhere is the material parameter of element I and is the stress status of corresponding element.The material damage evolving equation reflected primarily the damage grade change with the timeUsing the dama
15、ge grade defined in the Eq(1)and the damage mechanics principle,the concrete damage evolving equation can be establishedwhere,D0,D is the damage grade at the initial moment and arbitrary moment t respectively,D is the change rate of damage gradeAlong with the developing of the damage,the degradation
16、 of the materia1 on micro structure turns worse gradually,finally results in the failure of the materialThe damage grade corresponding to this condition should meet the failure criterion of damage:where,Df is the damage grade when concrete lost its carrying capacityThe whole process and the statuses
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