【摘要】：摘要：隨著各種工程結(jié)構(gòu)加固改造技術(shù)的不斷發(fā)展,研究人員需要更加精確地評(píng)估各種加固技術(shù)的作用效果,并建立具有針對(duì)性的計(jì)算模型。加固混凝土圓柱是工程結(jié)構(gòu)加固改造技術(shù)的主要問(wèn)題之一。由于傳統(tǒng)的FRP加固混凝土圓柱技術(shù)存在應(yīng)力滯后問(wèn)題,而環(huán)向預(yù)應(yīng)力FRP加固混凝土圓柱能夠?qū)诵幕炷潦艿街鲃?dòng)約束,充分發(fā)揮FRP材料的高強(qiáng)性能,避免FRP的應(yīng)力滯后,從而起到更好的加固效果。故本文進(jìn)行了環(huán)向預(yù)應(yīng)力FRP主動(dòng)約束混凝土圓柱的試驗(yàn)研究、主動(dòng)約束機(jī)理及損傷演化規(guī)律研究,建立針對(duì)環(huán)向預(yù)應(yīng)力FRP主動(dòng)約束情況下混凝土圓柱的損傷模型并提出預(yù)應(yīng)力度的建議值,以指導(dǎo)實(shí)際工程。 (1)在細(xì)觀層次上,受壓混凝土破壞主要由于混凝土中的骨料與水泥砂漿的泊松比不同,通過(guò)變形協(xié)調(diào)導(dǎo)致混凝土產(chǎn)生損傷。 (2)環(huán)向預(yù)應(yīng)力FRP加固混凝土圓柱的軸心受壓試驗(yàn)完成了包括對(duì)比柱在內(nèi)的18個(gè)試件,研究了預(yù)應(yīng)力大小、混凝土強(qiáng)度等級(jí)、截面尺寸和表面處理情況等四個(gè)影響因素；使用有限元軟件進(jìn)行數(shù)值模擬,分析了主動(dòng)約束混凝土圓柱的應(yīng)變演化規(guī)律,提出預(yù)應(yīng)力度的建議值為0.2。 (3)從構(gòu)件層次提出了環(huán)向預(yù)應(yīng)力FRP主動(dòng)約束混凝土圓柱的損傷演化規(guī)律。 (4)將損傷變量視為內(nèi)變量,基于等效應(yīng)變?cè)?提出了一個(gè)含損傷內(nèi)變量的構(gòu)件層次的環(huán)向預(yù)應(yīng)力FRP主動(dòng)約束混凝土圓柱的本構(gòu)模型,計(jì)算值與試驗(yàn)值吻合較好。 (5)證明了高約束比下,環(huán)向預(yù)應(yīng)力FRP主動(dòng)約束混凝土圓柱可不考慮尺寸效應(yīng)的影響。 (6)證明了對(duì)圓柱表面的FRP涂覆浸漬膠增加了試件的承載力和延性性能；對(duì)圓柱表面的混凝土打磨處理對(duì)試件的靜力性能無(wú)明顯影響。
[Abstract]:Absrtact: with the continuous development of various reinforcement and reconstruction technologies of engineering structures, researchers need to evaluate the effect of various reinforcement techniques more accurately and establish a targeted calculation model. Strengthening concrete columns is one of the main problems in strengthening and reforming engineering structures. Because of the problem of stress lag in the traditional FRP technique for strengthening concrete columns, the RC columns strengthened by circumferential prestressed FRP can be actively confined to the core concrete, which can give full play to the high strength performance of FRP materials and avoid the stress lag of FRP. In order to play a better reinforcement effect. In this paper, the experimental study, the mechanism of active restraint and the law of damage evolution of concrete columns with circumferential prestressed FRP are carried out. The damage model of concrete cylinder under the active restraint of circumferential prestressed FRP is established and the suggested value of prestress degree is put forward to guide the practical engineering. (1) at the mesoscopic level, The failure of compressive concrete is mainly due to the difference of Poisson's ratio between aggregate and cement mortar. Concrete damage is caused by deformation coordination. (2) the axial compression test of concrete columns strengthened by circumferential prestressed FRP has completed 18 specimens, including contrast columns, and studied the size of prestress and the grade of concrete strength. In this paper, the strain evolution law of concrete columns with active confinement is analyzed by using finite element software to simulate the four influencing factors, such as section size and surface treatment. The suggested value of prestress is 0.2. (3) the damage evolution law of RC columns with circumferential prestressed FRP active confinement is proposed from the member level. (4) the damage variable is regarded as an internal variable based on the equivalent strain principle. In this paper, a constitutive model of RC columns with annular prestressed FRP active confinement with internal damage variables is proposed. The calculated values are in good agreement with the experimental values. (5) it is proved that under the high constraint ratio, the constitutive model can be obtained. The effect of size effect can be ignored in the circumferential prestressed FRP active confined concrete cylinder. (6) it is proved that the FRP coating impregnating adhesive on the cylindrical surface increases the bearing capacity and ductility of the specimen; The static properties of the specimens are not affected by the grinding treatment of concrete on the cylindrical surface.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU375.3

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