Combining with the National Natural Science Foundation ofChina(No.50478032), following researches were done in this thesis: 1 The variation regularity of the ultimate anti-bending capacity of therectangular-sectioned beam with different corrosion has been obtained through thequalitative analysis of 48 beams (32 corroded beams and 12 comparing beams) withaccelerated corrosion; 2 The conclusion has been obtained that the strain of corroded steel bar andconcrete no longer fit in with the assumption of plane section through the analysis ofthe strain data, the strain relation of steel bar and concrete in the mid-span section ofvariously corroded beams at ultimate has been obtained. Through the building of newgeometric relation, the expression of the height of compressive area in the corrodedbeam with rectangular section has been deduced, and the formula with corrosion rateas the main variable for the anti-bending capacity of the corroded concrete beam hasbeen suggested and verified by experiment.; 3 The influence of steel bar corrosion and the concrete regression to the flexureductility coefficient of the corroded structure component has been analyzed. Based onthe relation of steel bar and concrete at yield and ultimate, the expression for theflexure at yield and ultimate of corroded reinforced concrete beam, and the model forthe calculation of the flexure ductility has been built.

本文結(jié)合國家自然科學(xué)基金項(xiàng)目(50478032)"既有鋼筋混凝土橋梁時(shí)變可靠度研究"，主要進(jìn)行了以下研究工作： 1通過對(duì)48根快速銹蝕鋼筋混凝土矩形截面梁(32根銹蝕梁和12根對(duì)比試驗(yàn)梁)數(shù)據(jù)的定性分析日韩视频在线免费播放，得到了不同銹蝕率下欧美加勒比，銹蝕鋼筋混凝土矩形截面梁極限抗彎承載力的變化規(guī)律； 2通過對(duì)應(yīng)變數(shù)據(jù)的分析操亚洲无码视频，論證了銹蝕構(gòu)件鋼筋和混凝土的應(yīng)變不再符合平截面假定的結(jié)論激情视频在线网，并通過回歸分析得出了不同銹蝕率的螺紋鋼筋梁和光圓鋼筋梁在極限彎矩作用下，跨中截面處鋼筋應(yīng)變和鋼筋處混凝土應(yīng)變的關(guān)系嘿咻嘿咻无码免费视频，通過構(gòu)造新的幾何關(guān)系久久av中文字幕免费在线观看，得出了銹蝕鋼筋混凝土矩形截面梁計(jì)算受壓區(qū)高度的表達(dá)式，既而得出了以銹蝕率為主要變量的銹蝕鋼筋混凝土矩形截面梁的正截面抗彎計(jì)算建議公式欧美18一19sex性外，并通過試驗(yàn)數(shù)據(jù)加以驗(yàn)證一级axi视频免费； 3分析了鋼筋銹蝕和混凝土劣化對(duì)銹蝕構(gòu)件曲率延性系數(shù)的影響，結(jié)合鋼筋屈服和極限彎矩兩種狀態(tài)下鋼筋和混凝土的應(yīng)變關(guān)系cao免费在线视频官网，分別得到了銹蝕鋼筋混凝土矩形截面梁屈服曲率和極限曲率的計(jì)算表達(dá)式欧美精品哟哟；既而推導(dǎo)出曲率延性系數(shù)的計(jì)算模型。

Existing literature on the inquiry,collation and analysis,this article had the following major tasks:1st,finite element simulation of the current analytical methods are summarized,and system introduction finite element software ADINA and ANSYS applied in the reinforced concrete built-up section.2nd,system introduction reinforced concrete component material performance as well as reinforced concrete nonlinear analysis main mathematical model. 3rd,the use of ANSYS and ADINA software simply supported beam simulation were compared.4th,uses the ANSYS analysis software,conducted 7 radical center bearing reinforcing steel-side steel pipe concrete short stump simulation test research,the research had indicated the reinforcing steel the existence strengthened the pillar ductility greatly.5th,based on ANSYS,has conducted 2 radical center bearing reinforcing steel-side steel pipe concrete member in bending simulation test research.

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In the dissertation, the study on carbon fiber reinforced concrete andplain concrete has been reviewed. Then mechano-electric effect of CFRC and plainconcrete, its mechanisms, the interaction among mechano-electric effect,piezoresistivity and seebeck effect, the electrical circuit model of concrete based onmechano-electric effect, electromagnetic emission of concrete, the mathematicalmodel of mechano-electric effect are investigated. Also the converse effect ofmechano-electric effect of CFRC and plain concrete, that is, electromechanicaleffect, and the interaction between electromechanical effect and electrothermaleffect of CFRC are examined.

本文對(duì)碳纖維混凝土和素混凝土機(jī)敏性的國內(nèi)外研究現(xiàn)狀進(jìn)行了全面的評(píng)述另类小说激情亚洲国产，在大量實(shí)驗(yàn)分析的基礎(chǔ)上欧美超碰播色屋任你爽，系統(tǒng)地研究了碳纖維混凝土和素混凝土的力電機(jī)敏性，研究了力電效應(yīng)機(jī)理在线播放专区、力電效應(yīng)與其它效應(yīng)(壓阻效應(yīng)男女AAA看大片免费、塞貝克效應(yīng)等)的耦合關(guān)系、基于力電效應(yīng)的混凝土電學(xué)模型国产美女精品AⅤ在线观看、混凝土電磁發(fā)射現(xiàn)象国产众筹模特无码对白、混凝土力電效應(yīng)的數(shù)學(xué)模型等；論文同時(shí)對(duì)混凝土和素混凝土的電力效應(yīng)精品爱99视频在线、碳纖維混凝土電力效應(yīng)與電熱效應(yīng)的耦合關(guān)系等進(jìn)行了探討禁18在线免费观看网站软件；最后開展了基于力電效應(yīng)的機(jī)敏混凝土結(jié)構(gòu)應(yīng)用研究。

Indoor flexural fatigue tests are carried out, the results are analyzed and two types of double logarithm fatigue equation under different stress level andequivalent stress level are got. Using the fatigue equation, the fatigue performance of porous concrete and common semi-rigid base materials and cement concrete are compared, the fatigue stress coefficient which is used in the load stress calculation for porous concrete as undersurface of cement concrete pavement and the tensile strength structure coefficient which is used in the flexural stress check for porous concrete as base of asphalt pavement are obtained.

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Using the fatigue equation, the fatigue performance of porous concrete and common semi-rigid base materials and cement concrete are compared, the fatigue stress coefficient which is used in the load stress calculation for porous concrete as undersurface of cement concrete pavement and the tensile strength structure coefficient which is used in the flexural stress check for porous concrete as base of asphalt pavement are obtained.

進(jìn)行室內(nèi)小梁彎拉疲勞試驗(yàn)黄色视频在线免费看网站，對(duì)疲勞試驗(yàn)數(shù)據(jù)進(jìn)行分析，得出多孔混凝土不同失效概率下兩種形式的雙對(duì)數(shù)疲勞方程欧美午夜AV免费看，利用疲勞方程三级国产专区，將其疲勞性能與常用半剛性基層材料和水泥混凝土進(jìn)行比較，還得出了多孔混凝土作為水泥混凝土路面下面層荷載應(yīng)力計(jì)算的疲勞應(yīng)力系數(shù)免费看va，和作為瀝青路面基層層底彎拉應(yīng)力驗(yàn)算的抗拉強(qiáng)度結(jié)構(gòu)系數(shù)在线无码视频一区二区。

Based on the further study of deformation rule of MgO-mixed concrete, the theory of 3-D finite element simulation analysis of MgO-mixed concrete arch dam is discussed in this dissertation combining with the example of YangChun MgO-mixed concrete arch dam. Moreover, the pertinent simulation analysis software is developed by the author and his colleagues. The main contents are as follows.( 1 ) Transformation rules of MgO-mixed concrete are studied. Hyperbola model of MgO-mixed concrete"s autogeny deformation, especially deduce of the model"s parameter and building process of the model are analyzed in detail.

本文結(jié)合陽春外摻MgO混凝土拱壩，在深入研究外摻MgO混凝土變形規(guī)律的基礎(chǔ)上中文字幕无码乱人l伦，詳細(xì)論述了外摻MgO混凝土拱壩三維有限元仿真分析的原理国产欧美精品图片久久久，與相關(guān)人員一起研制了有關(guān)仿真分析軟件，其主要研究內(nèi)容如下：(1)研究分析了MgO混凝土的變形規(guī)律国产网站观看，并重點(diǎn)對(duì)MgO混凝土的自生體積變形的雙曲線模型男人看的黄色网站，尤其對(duì)模型中參數(shù)變量的推求及模型的建立過程作了詳細(xì)分析。

The reliability of analysis result depends largely on the in-house experimental conditions. Unlike the previous analysis that only concerns the sole effect of permeable pressure, this article considers both permeable and confining pressure and deformation characteristics of concrete material under the interaction of them according to the real work state of construction, which may leads to the changing pattern of permeable rate as listed below: permeable rate always reaches its peak with the time process going on, than goes down and remains straight on some certain value; The PR will tend to decline while the confining pressure is increased, and the time taken before the peak will be extended as well; Under the constant permeable pressure and circularly changing confining pressure, the minus-exponential ascend and descend relationship could be applied between the PR and Time axes respectively with crannied and intact concrete samples, and the PR of crannied concrete is far more larger than that of intact concrete. The change pattern of concrete could also be mathematically analogized using the least square method.

室內(nèi)的實(shí)驗(yàn)條件是研究成果可靠性的重要因素黄色工厂AV片，而以往的研究都只考慮了滲透壓單一作用欧美日韩精品码免费专区，本文根據(jù)混凝土結(jié)構(gòu)的實(shí)際工作狀態(tài)，同時(shí)考慮了圍壓與滲透壓共同作用下的混凝土材料的滲透性變化特征黄色视频入，得出了混凝土材料在圍壓作用與滲透壓共同作用下的滲透率的變化規(guī)律：滲透率都是隨時(shí)間推移先達(dá)到一個(gè)峰值精品一区二区三区无码视频，再降低并趨于平穩(wěn)99久强奸久久9毛片；滲透率會(huì)隨圍壓的增大而減小，并且峰值的到達(dá)時(shí)間也會(huì)隨之延長免费色色色色；在滲透壓不變另类日韩高清精品视频在线观看免费，圍壓升降循環(huán)的情況下，有裂縫黄色视频免费看在线网站、無裂縫混凝土的滲透率變化規(guī)律是隨時(shí)間成負(fù)指數(shù)關(guān)系上升国产色网站农村、下降，且有裂縫混凝土試件的滲透率遠(yuǎn)遠(yuǎn)高于無裂縫混凝土的滲透率婷婷操操b，并對(duì)混凝土的變化規(guī)律運(yùn)用最小二乘法進(jìn)行數(shù)學(xué)擬合国内在拍视频在线播放。

In this paper, the 3-D finite element relocating mesh method is used to calculate the temperature field and the thermal creep stress field of spillway dam and mid level outlet dam in certain roller compacted concrete gravity dam, sensitivity analysis have been down with different parameters, such as placing temperature, the location of cooling pipe, cooling temperature, time for water supply, ascended-layer of concrete, intermissive time and different placing time, and the commendatory construction scheme have been put forward in such analysis; according by the test result on the two scheme of concrete aggregate combination (basalt as coarse aggregate and limestone as fine aggregate, basalt as coarse aggregate and basalt as fine aggregate), simulation analysis on temperature field and thermal creep stress field of the commendatory construction scheme have been down, and analysis have also been down on temperature field and thermal stress field of the two different aggregate combination, the result indicates that the spillway dam and mid level outlet dam which adopted these two aggregate combination can both satisfy the require of design crack resistance in concrete, furthermore limestone as fine is better than basalt as fine aggregate; the effect of summer water storage and winter water storage on the temperature field and thermal stress field have been analyzed, comparing with winter water storage, in summer water storage scheme the maximum tensile stress at abnormal concrete in upstream fill is decreased by 0.1～0.3MPa and there are no evidence change of the maximum tensile stress at other parts, which indicate that summer water storage is avail for the crack resistance of upstream fill; according to the simulation calculating result and comparing temperature simulation calculating results and temperature controlling measures of some similarity projects both completed and construction, synthesis appraise have been carried to the design temperature controlling measures of dam, and the temperature controlling measures of this project have been brought forward, all these have great reference value on the design of temperature controlling measures and the optimization of the construction scheme.

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Test result makes clear, different intensity grade abandons the stuff of second birth wide market that gets after concrete mix up, of the compressive strength of concrete of second birth of different origin of compressive strength; that will reduce second birth concrete significantly all be worth concrete of singler source second birth to reduce, and variance and coefficient of variation increase; to use normal school model to be opposite of compressive strength of concrete of different origin second birth distributing undertook examining, use Monte-Carlo imitate method farther test and verify should distributing the rule.

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Firstly, by analyzing existing models of predicting concrete carbonation and its influencing factors, a practical model of predicting the depth of carbonated concrete is proposed in this thesis, which takes the compressive strength of concrete as the main parameter and considers influence of temperature and moisture of environment, construction factors, stress condition and density of CO2 in the environment, and plenty of spot-data has been used to verify the model; By means of regression analysis of the spot-data, the calculating model of uncarbonated remainder is formulated; Considering the randomness of concrete carbonation, the paper put forward a probability analysis method of concrete carbonation span-life.

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