本文選題：復(fù)合砂漿　切入點：鋼絲繩　出處：《東北林業(yè)大學(xué)》2014年碩士論文

【摘要】：橋梁長期在自然環(huán)境和使用環(huán)境的荷載作用下,常出現(xiàn)損傷與病害,承載能力下降,嚴(yán)重影響到橋梁的正常使用。對大量既有橋梁進行維修、加固與改造,保持其正常使用功能,延長其使用壽命,具有重要的工程價值和意義。 復(fù)合砂漿預(yù)應(yīng)力鋼絲繩加固技術(shù)是一種新型的加固技術(shù)采用小直徑預(yù)應(yīng)力鋼絲繩作為預(yù)應(yīng)力的施加介質(zhì),通過錨具傳遞到加固結(jié)構(gòu)上,并用復(fù)合砂漿對鋼絲繩進行防護的方法提高舊橋承載能力。它有著顯著的優(yōu)點：小直徑鋼絲繩錨固較容易,而且強度高可以可靠傳遞預(yù)應(yīng)力；復(fù)合砂漿可以將鋼絲繩與梁體可靠的粘結(jié)到一起,具有錨固及防止預(yù)應(yīng)力筋銹蝕的作用,延長了加固體系的耐久性；預(yù)應(yīng)力的施加引起橋梁一定程度的反拱,減小了由自重引起的內(nèi)力,極大地提高了橋梁的安全性能。 本文首先對采用復(fù)合砂漿預(yù)應(yīng)力鋼絲繩加固的鋼筋混凝土矩形梁進行了抗彎性能試驗研究,試驗包括1根對比梁和4根加固梁,分析了鋼絲繩的不同布置方式以及復(fù)合砂漿對梁體抗彎性能的影響,并利用ANSYS有限元分析軟件對鋼絲繩加固梁和未加固梁的試驗過程進行了非線性數(shù)值模擬,將有限元模型分析結(jié)果與試驗結(jié)果進行對比,以驗證試驗結(jié)果的可靠性,同時進行了抗彎加固的有限元參數(shù)分析,著重分析了混凝土強度及鋼絲繩的張拉控制應(yīng)力大小對加固構(gòu)件開裂荷載和屈服荷載的影響,最后用復(fù)合砂漿預(yù)應(yīng)力鋼絲繩加固方法對實際加固工程橋梁進行加固設(shè)計,通過對加固前后的撓度、應(yīng)變等數(shù)據(jù)的對比分析,預(yù)應(yīng)力鋼絲繩加固方法可以明顯提高舊橋的承載能力,較大程度改善原橋的受力性能,對橋梁結(jié)構(gòu)的受力裂縫有較好的收縮作用,而復(fù)合砂漿則可延長預(yù)應(yīng)力鋼絲繩的使用壽命,具有較好的耐久性能。
[Abstract]:Under the load of natural environment and service environment for a long time, the bridge often appears damage and disease, and the bearing capacity decreases, which seriously affects the normal use of the bridge.It is of great engineering value and significance to repair, reinforce and rebuild a large number of existing bridges, to maintain their normal function and to prolong their service life.The composite mortar prestressed wire rope reinforcement technology is a new type of reinforcement technology. The small diameter prestressed wire rope is used as the applied medium of the prestressing force, which is transferred to the strengthened structure through the anchor.The bearing capacity of old bridge is improved by using composite mortar to protect wire rope.It has obvious advantages: small diameter wire rope anchoring is easy, and high strength can reliably transfer prestress; composite mortar can bond the wire rope to beam body reliably, which has the function of anchoring and preventing the corrosion of prestressed tendons.The durability of the reinforcement system is prolonged, and the application of prestress causes a certain degree of reverse arch of the bridge, reduces the internal force caused by self-weight, and greatly improves the safety performance of the bridge.In this paper, the flexural behavior of reinforced concrete rectangular beams strengthened by composite mortar prestressed steel wire rope is studied in this paper. The experiment includes one contrast beam and four strengthened beams.The different arrangement of wire rope and the influence of composite mortar on the bending behavior of beam are analyzed. The nonlinear numerical simulation of the test process of steel wire rope strengthened beam and unstrengthened beam is carried out by using ANSYS finite element analysis software.The finite element model analysis results are compared with the test results to verify the reliability of the test results, and the finite element parameter analysis of flexural reinforcement is also carried out.The influence of concrete strength and tension control stress of steel wire rope on the cracking load and yield load of reinforced members is analyzed emphatically. Finally, the reinforcement design of practical strengthened bridge is carried out by using composite mortar prestressed steel wire rope reinforcement method.Through the comparison and analysis of deflection, strain and other data before and after reinforcement, the prestressed wire rope reinforcement method can obviously improve the bearing capacity of the old bridge and greatly improve the mechanical performance of the original bridge.The composite mortar can prolong the service life of prestressed wire rope and has better durability.
【學(xué)位授予單位】：東北林業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U445.7

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