本文選題：ASR + 實(shí)驗(yàn)�。� 參考：《揚(yáng)州大學(xué)》2014年碩士論文

【摘要】：根據(jù)近年來的調(diào)查發(fā)現(xiàn),日本的一些構(gòu)造物中發(fā)生了堿骨料反應(yīng)(ASR)而導(dǎo)致混凝土膨脹,實(shí)際構(gòu)造物上產(chǎn)生了表面裂縫及整體變形；同時(shí),膨脹導(dǎo)致的內(nèi)部箍筋頻繁的發(fā)生斷裂現(xiàn)象�；谘芯楷F(xiàn)狀,構(gòu)造物的角落處的張開變形可能會促使箍筋第一次彎曲產(chǎn)生的初期裂縫進(jìn)一步發(fā)展,甚至導(dǎo)致箍筋的斷裂。以前學(xué)者只是基于外部的角落的張開變形來推測內(nèi)部鋼筋變形情況,但是箍筋角落處的張開變形沒有被直接證明。所以,找出外觀劣化特點(diǎn)與內(nèi)部箍筋破斷的關(guān)系和直接證明內(nèi)部膨脹導(dǎo)致箍筋變形是本實(shí)驗(yàn)研究的重點(diǎn)。為了模擬內(nèi)部ASR膨脹引起的內(nèi)部箍筋破斷及約束混凝土的退化和破壞,將膨脹混凝土澆筑在中心空心、外圍包裹的普通混凝土框架中,制作了6個(gè)試件進(jìn)行了實(shí)驗(yàn)。參數(shù)設(shè)計(jì)為：從約束方面考慮,設(shè)置不同配筋率的箍筋和不同厚度的外圍普通混凝土框架；從內(nèi)部膨脹力考慮,設(shè)置不同的內(nèi)部膨脹混凝土的量；從鋼筋種類考慮,設(shè)置了3中箍筋來考察箍筋的損傷破斷情況在實(shí)驗(yàn)過程中,測量了表面的裂縫和變形情況,以此來下推測內(nèi)部箍筋的運(yùn)動(dòng)情況；此外,觀察了不同箍筋的在第一次彎曲時(shí)產(chǎn)生的初始裂縫。同時(shí),膨脹實(shí)驗(yàn)結(jié)束后,將箍筋取出,再次觀察了由于內(nèi)部膨脹使箍筋產(chǎn)生的進(jìn)展裂縫。接著,作者將外觀劣化進(jìn)行詳細(xì)了分類,總結(jié)了箍筋的運(yùn)動(dòng)。因此,進(jìn)一步的分析的目的是研究外部變形的特征和原理,直接調(diào)查箍筋的運(yùn)動(dòng)情況。由于內(nèi)部膨脹,根據(jù)引起裂縫和變形力的不同,作者把裂縫和變形情況進(jìn)行研究分類,討論了其產(chǎn)生的原因。最后,直接通過測量箍筋彎曲部位來確定膨脹前后的角度,通過結(jié)合外部劣化情況和箍筋變形情況來推測由內(nèi)部ASR膨脹引起的箍筋斷裂的機(jī)理。
[Abstract]:According to investigations in recent years, some structures in Japan have taken place alkaline aggregate reaction (ASR), resulting in concrete expansion, resulting in surface cracks and overall deformation in the actual structures; at the same time, The internal stirrups are frequently fractured due to expansion. Based on the present research situation the opening deformation at the corner of the structure may promote the further development of the initial cracks produced by the first bending of the stirrups and even lead to the fracture of the stirrups. In the past, scholars only speculated on the deformation of internal steel bar based on the opening deformation of the external corner, but the opening deformation at the corner of stirrups was not directly proved. Therefore, finding out the relationship between appearance deterioration and internal stirrups breaking and directly proving that internal expansion leads to stirrups deformation is the key point of this experiment. In order to simulate the fracture of internal stirrups and the degradation and failure of confined concrete caused by internal ASR expansion, six specimens were made by pouring expansive concrete into the hollow and outer concrete frame. The parameters are designed as follows: considering the constraints, setting stirrups with different reinforcement ratios and ordinary concrete frames with different thickness; considering the internal expansion force, setting different amount of internal expansive concrete; considering the types of reinforcement, Three stirrups are set up to investigate the damage and fracture of stirrups. During the experiment, the cracks and deformation of the surface are measured to infer the movement of the internal stirrups. The initial cracks in the first bending of different stirrups are observed. At the same time, after the expansion experiment, the stirrups are removed and the progressive cracks caused by internal expansion are observed again. Then, the author classifies the appearance deterioration in detail and summarizes the movement of stirrups. Therefore, the purpose of further analysis is to study the characteristics and principles of external deformation and investigate the movement of stirrups directly. Due to internal expansion, according to the difference of fracture and deformation force, the author classifies the fracture and deformation, and discusses the causes of the fracture and deformation. Finally, the angle before and after expansion is determined directly by measuring the bending position of stirrups, and the fracture mechanism of stirrups caused by internal ASR expansion is inferred by combining the external deterioration and the deformation of stirrups.
【學(xué)位授予單位】：揚(yáng)州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU375

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