本文選題：鋼絞線　切入點(diǎn)：粘結(jié)　出處：《中國(guó)礦業(yè)大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：許多預(yù)應(yīng)力混凝土結(jié)構(gòu)須要承受疲勞荷載與腐蝕環(huán)境的共同作用,這將導(dǎo)致鋼筋和粘結(jié)發(fā)生不收斂的腐蝕疲勞耦合損傷,結(jié)構(gòu)抗力因此而不斷退化。本文以氯鹽腐蝕環(huán)境為背景,以有粘結(jié)鋼絞線預(yù)應(yīng)力混凝土結(jié)構(gòu)為對(duì)象,基于長(zhǎng)期腐蝕疲勞試驗(yàn)?zāi)M,研究鋼絞線與混凝土粘結(jié)的腐蝕疲勞損傷特征和演化規(guī)律,從而為預(yù)應(yīng)力混凝土結(jié)構(gòu)耐久性評(píng)估與設(shè)計(jì)提供參考。通過(guò)對(duì)摻鹽腐蝕預(yù)應(yīng)力混凝土粘結(jié)試件進(jìn)行長(zhǎng)期疲勞加載以形成腐蝕疲勞損傷,然后進(jìn)行靜力拉拔試驗(yàn),據(jù)此分析了混凝土和鋼絞線的損傷特征及破壞特征,考察了粘結(jié)滑移曲線特征及粘結(jié)強(qiáng)度隨腐蝕和疲勞作用強(qiáng)度退化的規(guī)律。采用恒電流法加速腐蝕鋼絞線,并同時(shí)對(duì)粘結(jié)試件施加疲勞荷載,以此研究粘結(jié)的腐蝕疲勞損傷特征以及腐蝕對(duì)疲勞壽命的影響規(guī)律。結(jié)果發(fā)現(xiàn),同時(shí)承受腐蝕和疲勞作用的粘結(jié)試件會(huì)發(fā)生混凝土劈裂及鋼絞線拔出的現(xiàn)象,此時(shí)標(biāo)志著試件達(dá)到了疲勞壽命終止?fàn)顟B(tài);粘結(jié)疲勞壽命隨疲勞應(yīng)力幅和腐蝕疲勞強(qiáng)度因子均呈指數(shù)型衰退的變化規(guī)律;通過(guò)對(duì)試驗(yàn)結(jié)果的擬合,建立了隨疲勞應(yīng)力幅和腐蝕疲勞強(qiáng)度因子變化的粘結(jié)壽命預(yù)計(jì)模型。根據(jù)前人研究結(jié)果,比較分析了鋼絞線受拉性能和粘結(jié)性能二者的退化規(guī)律與模型,發(fā)現(xiàn)在腐蝕疲勞共同作用下,預(yù)應(yīng)力混凝土構(gòu)件承載力退化的控制因素是鋼絞線的受拉性能,鋼絞線與混凝土的粘結(jié)性能退化相對(duì)成為其次。
[Abstract]:Many prestressed concrete structures need to bear the joint action of fatigue load and corrosion environment, which will lead to non-convergent corrosion fatigue coupling damage of steel bar and bond. In this paper, the corrosion environment of chloride salt is taken as the background, the prestressed concrete structure of bonded steel strand is taken as the object, and the simulation of long-term corrosion fatigue test is carried out. The corrosion fatigue damage characteristics and evolution law of bond between steel strand and concrete are studied. So as to provide a reference for the durability evaluation and design of prestressed concrete structures. The corrosion fatigue damage is formed by long-term fatigue loading on the bonded specimens of salt corroded prestressed concrete, and then the static pull-out test is carried out. Based on this, the damage and failure characteristics of concrete and steel strands are analyzed, and the characteristics of bond-slip curve and the law of bond strength degradation with corrosion and fatigue strength are investigated. The constant current method is used to accelerate the corrosion of steel strands. At the same time, the fatigue load is applied to the bonded specimen, so as to study the corrosion fatigue damage characteristics of bond and the influence of corrosion on fatigue life. At the same time, concrete splitting and steel strand pull-out will occur in the bonded specimens subjected to corrosion and fatigue, which indicates that the specimen has reached the state of fatigue life termination. The change of bond fatigue life with fatigue stress amplitude and corrosion fatigue strength factor is exponential. The prediction model of bond life with the variation of fatigue stress amplitude and corrosion fatigue strength factor is established. According to the results of previous studies, the degradation laws and models of tensile and bond properties of steel strands are compared and analyzed. It is found that under the joint action of corrosion fatigue, the tensile behavior of steel strands is the controlling factor for the degradation of the bearing capacity of prestressed concrete members, and the degradation of bond performance between steel strands and concrete is the second.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TU528

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本文編號(hào)：1642244