本文關(guān)鍵詞： 橋梁加固 不排水加固 不分散混凝土 纖維網(wǎng)格 FRP-鋼復(fù)合管　出處：《南京林業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：由于上部荷載、水流及其它環(huán)境作用等,橋梁水下混凝土結(jié)構(gòu)的病害往往較為嚴(yán)重且難以被發(fā)現(xiàn),傳統(tǒng)加固技術(shù)需要設(shè)置圍堰等大型臨時(shí)設(shè)施,施工費(fèi)用高,社會(huì)影響大,鑒于此,本文以不排水加固為指導(dǎo)思想,開展了水下混凝土結(jié)構(gòu)加固技術(shù)的相關(guān)研究。利用帶有預(yù)制裂縫的圓柱形混凝土試件,在試驗(yàn)室水箱中模擬水下混凝土裂縫灌注,試件軸向抗壓試驗(yàn)結(jié)果顯示水下裂縫修補(bǔ)試件的破壞屬于內(nèi)聚破壞,極限荷載超過對(duì)比試件5.79%;利用帶有預(yù)制缺陷的圓柱形混凝土試件,在水箱中對(duì)其灌注水下適用的環(huán)氧樹脂,試件軸向抗壓試驗(yàn)結(jié)果顯示經(jīng)過加固的缺陷試件抗壓強(qiáng)度超過對(duì)比試件16.8%;在水箱中對(duì)混凝土試件進(jìn)行模擬植筋施工,拉拔強(qiáng)度試驗(yàn)顯示各試件的植入鋼筋均被拔出,據(jù)此分析了鋼筋直徑、孔深對(duì)極限荷載、粘結(jié)強(qiáng)度的影響;在水箱中澆筑混凝土抗壓強(qiáng)度標(biāo)準(zhǔn)試件,力學(xué)試驗(yàn)結(jié)果表明不分散混凝土水陸強(qiáng)度比能達(dá)到82%,可以滿足水下施工的需求。通過對(duì)空間曲面纖維網(wǎng)格加固水下混凝土結(jié)構(gòu)技術(shù)的研究,在試驗(yàn)室制作出小尺寸異形構(gòu)件加固所需的空間曲面網(wǎng)格制品,提出了相關(guān)制作工藝,試件抗拉試驗(yàn)結(jié)果表明該制品力學(xué)性能相對(duì)穩(wěn)定,能夠滿足加固施工的需求。同時(shí),利用空間網(wǎng)格制品配合水下不分散砂漿對(duì)水下混凝土結(jié)構(gòu)進(jìn)行模擬加固施工,提出了空間網(wǎng)格加固水下混凝土結(jié)構(gòu)的相關(guān)工藝,試件軸向抗壓試驗(yàn)結(jié)果顯示,該工藝能在不排水的條件下對(duì)小尺寸異形結(jié)構(gòu)進(jìn)行加固,顯著提高水下混凝土結(jié)構(gòu)的承載能力,并根據(jù)試驗(yàn)結(jié)果推導(dǎo)出相關(guān)承載能力計(jì)算模型。提出了FRP-鋼復(fù)合管加固橋梁水下結(jié)構(gòu)的技術(shù)工藝,并對(duì)其反力點(diǎn)的設(shè)置進(jìn)行了專門研究,給出了反力點(diǎn)的設(shè)計(jì)方法;通過對(duì)復(fù)合管-土層相互作用的研究,分析了復(fù)合管豎向承載力的構(gòu)成,同時(shí)利用有限元軟件模擬了復(fù)合管的壓入過程,對(duì)比不同的管徑、壁厚、摩擦系數(shù)條件下靜壓力的變化,并據(jù)此給出了靜力壓入施工的相關(guān)建議。
[Abstract]:Because of the upper load, water flow and other environmental effects, the disease of underwater concrete structure of bridge is often serious and difficult to be found. Traditional reinforcement technology needs to set up large temporary facilities such as cofferdam, the construction cost is high, and the social impact is great. In view of this, this paper, taking undrained reinforcement as the guiding principle, has carried out the relevant research on the strengthening technology of underwater concrete structure. Using cylindrical concrete specimens with prefabricated cracks, the paper simulates the underwater concrete crack pouring in the water tank of the laboratory. The results of axial compression test show that the damage of underwater crack repair specimen is cohesive failure, and the ultimate load exceeds the contrast specimen 5.79. Using the cylindrical concrete specimen with prefabricated defects, the epoxy resin suitable for underwater is poured into the water tank. The axial compression test results of the specimens show that the compressive strength of the reinforced defective specimens is higher than that of the contrast specimens, and the concrete specimens are subjected to simulated reinforcement planting in the water tank, and the tensile strength tests show that all the steel bars implanted in the specimens are pulled out. The influence of the diameter and depth of steel bar on ultimate load and bond strength is analyzed, and the standard specimen of compressive strength of concrete is built in water tank. The results of mechanical tests show that the water-land strength ratio of non-dispersible concrete can reach 82.It can meet the requirements of underwater construction. The space curved mesh products for the reinforcement of small size special-shaped members are made in the laboratory, and the related fabrication techniques are put forward. The tensile test results of the specimens show that the mechanical properties of the products are relatively stable and can meet the needs of the reinforcement construction. In this paper, the underwater concrete structure is strengthened by using space mesh products combined with underwater non-dispersed mortar, and the related technology of strengthening underwater concrete structure with spatial grid is put forward. The results of axial compression test of the specimens show that, The technology can reinforce the small size special-shaped structure without drainage, and improve the bearing capacity of underwater concrete structure. Based on the experimental results, the calculation model of bearing capacity is deduced. The technical process of FRP- steel composite pipe strengthening bridge underwater structure is put forward, and the setting of reaction point is studied specially, and the design method of reaction point is given. Through the study of the interaction between composite pipe and soil layer, the vertical bearing capacity of composite pipe is analyzed. At the same time, the indentation process of composite pipe is simulated by using finite element software, and the wall thickness and diameter of composite pipe are compared. The change of static pressure under the condition of friction coefficient is given.
【學(xué)位授予單位】：南京林業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U445.72

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本文編號(hào)：1523512