預(yù)應(yīng)力碳纖維板加固混凝土梁的應(yīng)力損失研究
發(fā)布時間：2018-10-10 17:55
【摘要】：碳纖維材料作為一種高性能材料已被大量應(yīng)用于加固工程。但是試驗研究表明，傳統(tǒng)的粘貼方法不能發(fā)揮碳纖維材料的高強度，并且加固效果很有限。預(yù)應(yīng)力加固技術(shù)是一種主動加固技術(shù)，不但可以使碳纖維材料的高強度得以發(fā)揮，而且可以大幅度提高加固效果。截至目前，國內(nèi)外出現(xiàn)了多種預(yù)應(yīng)力碳纖維材料加固技術(shù)，是當(dāng)前加固技術(shù)的研究熱點。 利用預(yù)應(yīng)力碳纖維材料加固必然關(guān)系到預(yù)應(yīng)力損失的研究。目前對預(yù)應(yīng)力碳纖維材料預(yù)應(yīng)力損失的研究主要針對碳纖維布和碳纖維板的研究，但是查閱文獻發(fā)現(xiàn)以往研究的碳纖維片材的預(yù)應(yīng)力水平相對于碳纖維材料來說是偏低的（普遍低于1000Mpa），而預(yù)應(yīng)力損失率還是偏高的（10％～30％）。本研究團隊開發(fā)了鉸式錨張拉錨固碳纖維板的預(yù)應(yīng)力工藝，對于以該工藝為基礎(chǔ)的預(yù)應(yīng)力損失研究還是存在一些不足，有些研究還是空白。為此，本論文對鉸式錨預(yù)應(yīng)力碳纖維板工藝的預(yù)應(yīng)力損失進行了系統(tǒng)的試驗研究和理論分析，取得如下主要成果： ①通過對大比例T梁構(gòu)件的預(yù)應(yīng)力加固試驗，測試了單層和雙層碳纖維板在預(yù)應(yīng)力張拉過程、預(yù)應(yīng)力放張以及中短期損失等的應(yīng)力變化，總的預(yù)應(yīng)力損失率都低于3％，，其中單層碳纖維板（50mm×2mm）在高預(yù)應(yīng)力水平（2079MPa）下，預(yù)應(yīng)力損失率1.6％。這些試驗結(jié)果表明，以鉸式波形錨為基礎(chǔ)的預(yù)應(yīng)力碳纖維板張拉工藝其工作效率高，應(yīng)力損失低，技術(shù)相對較先進。 ②在本文采用的加固工藝中，緊固螺栓時的扭矩作用和碳纖維板頂升作用都能夠少量的增加碳纖維板中的拉應(yīng)力，彌補其預(yù)應(yīng)力損失，有可能使碳纖維板的最終有效預(yù)應(yīng)力超過首次張拉的碳纖維的應(yīng)力，這是本文預(yù)應(yīng)力工藝的特點之一。 ③推導(dǎo)出了扭矩作用和頂升碳纖維板時預(yù)應(yīng)力增量的計算公式，為實際工程中這兩部分預(yù)應(yīng)力增量的計算提供參考。 ④參照《公路鋼筋混凝土及預(yù)應(yīng)力混凝土橋涵設(shè)計規(guī)范》中后張預(yù)應(yīng)力損失分類及計算方法，總結(jié)和推導(dǎo)了以鉸式錨張拉碳纖維板的預(yù)應(yīng)力損失的主要因素：錨固系統(tǒng)變形、混凝土的彈性壓縮、預(yù)應(yīng)力碳纖維板的應(yīng)力松弛、混凝土的收縮和徐變，并給出了各項預(yù)應(yīng)力損失的計算公式及有效預(yù)應(yīng)力計算方法。 以上研究表明，采用鉸式錨張拉碳纖維板的預(yù)應(yīng)力工藝，張拉操作簡單，回縮量小，錨固可靠，作業(yè)效率高。綜合考慮各種因素的影響，混凝土構(gòu)件的長期損失可以近似的取3%的初始張拉應(yīng)力為總預(yù)應(yīng)力損失的簡化估算值。
[Abstract]:As a kind of high performance material, carbon fiber material has been widely used in reinforcement engineering. However, the experimental results show that the traditional bonding method can not exert the high strength of carbon fiber material, and the reinforcement effect is very limited. Prestressed reinforcement is a kind of active reinforcement technology, which can not only make the high strength of carbon fiber material play, but also greatly improve the effect of reinforcement. Up to now, there are many kinds of prestressed carbon fiber reinforcement technology at home and abroad, which is the research hotspot of current reinforcement technology. The study of prestress loss is bound to be related to the reinforcement of prestressed carbon fiber material. At present, the research on prestressing loss of prestressed carbon fiber material is mainly focused on carbon fiber sheet and carbon fiber sheet. But it is found that the prestress level of carbon fiber sheet is lower than that of carbon fiber material (generally lower than 1000Mpa), and the loss rate of prestress is still high (10% or 30%). The research team has developed the prestressing technology of hinged anchor tension Anchorage carbon fiber slab. There are still some deficiencies in the study of the prestressing loss based on this technology and some researches are still blank. Therefore, in this paper, the prestress loss of hinged anchor prestressed carbon fiber slab is systematically studied and theoretically analyzed. The main results are as follows: 1 through the pre-stressed reinforcement test of large proportion T-beam members, The stress changes of monolayer and bilayer carbon fiber slabs during prestress tensioning, prestressing tensioning and medium and short term losses are measured. The total prestress loss rate of monolayer carbon fiber sheet (50mm 脳 2mm) is lower than that of three layers, in which monolayer carbon fiber sheet (50mm 脳 2mm) is at high prestress level (2079MPa). The loss rate of prestress is 1.6%. These experimental results show that the prestressed carbon fiber sheet tensioning process based on hinged wave anchors has the advantages of high efficiency, low stress loss and relatively advanced technology. 2 in the reinforcement process adopted in this paper, Both the torque and the jacking action of the fastening bolt can increase the tensile stress in the carbon fiber plate and make up for the loss of prestressing force. It is possible that the ultimate effective prestress of the carbon fiber plate exceeds the stress of the first tensioned carbon fiber. This is one of the characteristics of the prestressing technology in this paper. 3. The formulas for calculating the torque and the increment of prestressing force when jacking carbon fiber slabs are derived. It provides a reference for the calculation of the prestress increment of these two parts in practical engineering. (4) with reference to the classification and calculation method of post-tensioned prestress loss in the Design Code for reinforced concrete and Prestressed concrete Bridges and culverts of Highway, This paper summarizes and deduces the main factors of prestressing loss of carbon fiber sheet with hinged anchor: deformation of anchoring system, elastic compression of concrete, stress relaxation of prestressed carbon fiber sheet, shrinkage and creep of concrete. The formulas for calculating the prestress loss and the calculation method for the effective prestress are also given. The above research shows that the prestressing technology of hinged anchor tensioning carbon fiber slab is simple in tensioning operation, small in retraction, reliable in anchoring and high in working efficiency. Considering the influence of various factors, the long-term loss of concrete members can be approximately taken 3% of the initial tensile stress as the simplified estimate of the total prestress loss.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU375.1
本文編號：2262735
[Abstract]:As a kind of high performance material, carbon fiber material has been widely used in reinforcement engineering. However, the experimental results show that the traditional bonding method can not exert the high strength of carbon fiber material, and the reinforcement effect is very limited. Prestressed reinforcement is a kind of active reinforcement technology, which can not only make the high strength of carbon fiber material play, but also greatly improve the effect of reinforcement. Up to now, there are many kinds of prestressed carbon fiber reinforcement technology at home and abroad, which is the research hotspot of current reinforcement technology. The study of prestress loss is bound to be related to the reinforcement of prestressed carbon fiber material. At present, the research on prestressing loss of prestressed carbon fiber material is mainly focused on carbon fiber sheet and carbon fiber sheet. But it is found that the prestress level of carbon fiber sheet is lower than that of carbon fiber material (generally lower than 1000Mpa), and the loss rate of prestress is still high (10% or 30%). The research team has developed the prestressing technology of hinged anchor tension Anchorage carbon fiber slab. There are still some deficiencies in the study of the prestressing loss based on this technology and some researches are still blank. Therefore, in this paper, the prestress loss of hinged anchor prestressed carbon fiber slab is systematically studied and theoretically analyzed. The main results are as follows: 1 through the pre-stressed reinforcement test of large proportion T-beam members, The stress changes of monolayer and bilayer carbon fiber slabs during prestress tensioning, prestressing tensioning and medium and short term losses are measured. The total prestress loss rate of monolayer carbon fiber sheet (50mm 脳 2mm) is lower than that of three layers, in which monolayer carbon fiber sheet (50mm 脳 2mm) is at high prestress level (2079MPa). The loss rate of prestress is 1.6%. These experimental results show that the prestressed carbon fiber sheet tensioning process based on hinged wave anchors has the advantages of high efficiency, low stress loss and relatively advanced technology. 2 in the reinforcement process adopted in this paper, Both the torque and the jacking action of the fastening bolt can increase the tensile stress in the carbon fiber plate and make up for the loss of prestressing force. It is possible that the ultimate effective prestress of the carbon fiber plate exceeds the stress of the first tensioned carbon fiber. This is one of the characteristics of the prestressing technology in this paper. 3. The formulas for calculating the torque and the increment of prestressing force when jacking carbon fiber slabs are derived. It provides a reference for the calculation of the prestress increment of these two parts in practical engineering. (4) with reference to the classification and calculation method of post-tensioned prestress loss in the Design Code for reinforced concrete and Prestressed concrete Bridges and culverts of Highway, This paper summarizes and deduces the main factors of prestressing loss of carbon fiber sheet with hinged anchor: deformation of anchoring system, elastic compression of concrete, stress relaxation of prestressed carbon fiber sheet, shrinkage and creep of concrete. The formulas for calculating the prestress loss and the calculation method for the effective prestress are also given. The above research shows that the prestressing technology of hinged anchor tensioning carbon fiber slab is simple in tensioning operation, small in retraction, reliable in anchoring and high in working efficiency. Considering the influence of various factors, the long-term loss of concrete members can be approximately taken 3% of the initial tensile stress as the simplified estimate of the total prestress loss.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU375.1
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