本文選題：裝配式橋梁 + 預(yù)制空心橋墩��； 參考：《合肥工業(yè)大學(xué)》2017年碩士論文

【摘要】：我國橋梁建設(shè)橋墩施工大多采用現(xiàn)澆混凝土施工工藝,這種傳統(tǒng)施工方法現(xiàn)場濕作業(yè)多,施工周期長,對周圍環(huán)境的影響大,與建筑工業(yè)化和綠色施工的要求不相符合。為了應(yīng)對現(xiàn)澆混凝土施工的缺陷,使用預(yù)制裝配式橋梁已成為橋梁建設(shè)的發(fā)展趨勢。裝配式橋梁采用工廠化生產(chǎn)現(xiàn)場拼裝技術(shù),提高了機械化施工水平,加快了施工進(jìn)度,有利于環(huán)境保護(hù),具有明顯的優(yōu)越性。裝配式橋梁的橋墩作為橋梁結(jié)構(gòu)的主要承重構(gòu)件,與承臺的連接是裝配式橋梁結(jié)構(gòu)受力的薄弱部位,在地震中容易遭受破壞。常見的預(yù)制墩柱與承臺的連接分為現(xiàn)澆式和承插式。這兩種連接方式預(yù)制橋墩拼裝定位難度大,現(xiàn)場鋼筋焊接工作量大,混凝土澆筑工藝復(fù)雜,墩柱與承臺結(jié)合部的抗剪性能差。本文結(jié)合濟(jì)祁高速淮河特大橋引橋工程,基于圓形空心鋼筋混凝土預(yù)制橋墩與承臺的兩種新型連接方式的現(xiàn)場原位加載試驗,利用非線性有限元分析軟件ABAQUS對兩種連接方式的受力及變形性能進(jìn)行了數(shù)值模擬,提出了合理的工藝流程確保墩底和承臺的連接質(zhì)量。主要研究內(nèi)容包括:(1)通過現(xiàn)場原位加載試驗,了解橋墩與承臺結(jié)合部的破壞過程及破壞形態(tài),獲得了試件的荷載-位移曲線以及荷載-應(yīng)力曲線等試驗數(shù)據(jù),對比分析了鋼板剪力釘和梯形剪力環(huán)兩種連接方式的受力性能和變形能力。試驗表明,試件的最終破壞形態(tài)均為彎曲破壞,兩種試件的破壞模式基本相同,均為墩底后澆杯口頂面上方連接區(qū)段,預(yù)制墩受拉側(cè)混凝土開裂,發(fā)生彎曲破壞。采用梯形剪力環(huán)連接方式的連接性能更穩(wěn)定。(2)選取合適的試件材料的應(yīng)力-應(yīng)變本構(gòu)關(guān)系,利用有限元軟件ABAQUS建立了試件的有限元分析模型,通過設(shè)置合理的邊界條件及截面接觸,進(jìn)行適當(dāng)?shù)木W(wǎng)格劃分,模擬試件在水平和豎向加載作用下的受力過程,繪制結(jié)構(gòu)能力曲線。并將模擬計算結(jié)果與試驗結(jié)果進(jìn)行對比分析,兩者吻合較好,驗證了預(yù)制裝配式空心橋墩與承臺結(jié)合部有限元模擬的合理性。(3)在試驗研究和理論分析的基礎(chǔ)上,對兩種連接方式的施工方法進(jìn)行對比分析及客觀評價,提出了合理的施工工藝流程,形成了較為系統(tǒng)的施工工法,并成功的運用于實際工程中。在此基礎(chǔ)上形成2項國家實用新型專利已獲授權(quán),獲得1項省級施工工法。論文研究為進(jìn)一步完善預(yù)制裝配式橋梁的應(yīng)用提供了理論依據(jù)和施工方法,對促進(jìn)我國裝配式混凝土橋梁在工程實踐中的應(yīng)用,推動建筑工業(yè)化的發(fā)展具有一定的意義。
[Abstract]:The construction of bridge piers in our country mostly adopts cast-in-place concrete construction technology. This traditional construction method has many wet work on the spot and long construction period, which has a great influence on the surrounding environment and does not accord with the requirements of building industrialization and green construction. In order to deal with the defects of cast-in-place concrete construction, the use of prefabricated bridges has become the development trend of bridge construction. The assembly bridge adopts the field assembling technology of factory production, which improves the mechanization construction level, speeds up the construction progress, is advantageous to the environmental protection, and has obvious superiority. The pier of prefabricated bridge is the main bearing member of the bridge structure, and the connection with the cap is the weak part of the prefabricated bridge structure, which is easy to be damaged in the earthquake. The common connection between prefabricated pier column and cap can be divided into cast-in-place type and socket type. It is difficult to assemble and locate the two kinds of prefabricated piers, the welding work of steel bar in the field is large, the pouring technology of concrete is complicated, and the shear resistance of the joint part of pier column and cap is poor. In this paper, the field in-situ loading test based on two new connecting modes of circular hollow reinforced concrete precast pier and cap is carried out on the basis of the approach bridge project of Jiqi High-speed Huaihe River Bridge. The nonlinear finite element analysis software ABAQUS is used to simulate the stress and deformation performance of the two connection modes, and a reasonable technological process is put forward to ensure the connection quality between the pier bottom and the cap. The main research contents include: (1) through in-situ loading test, the failure process and failure pattern of the joint of pier and cap are understood, and the load-displacement curve and load-stress curve of the specimen are obtained. The mechanical properties and deformation capacity of steel plate shear nail and trapezoidal shear ring are compared and analyzed. The test results show that the ultimate failure mode of the specimens is bending failure, and the failure modes of the two specimens are basically the same, both of which are connected section above the top surface of the post-pouring cup mouth at the bottom of the pier, and the precast pier is cracked by the tensile side concrete, which results in bending failure. The connection performance of trapezoidal shear ring is more stable. (2) the stress-strain constitutive relation of the appropriate specimen is selected, and the finite element analysis model of the specimen is established by using the finite element software ABAQUS. By setting reasonable boundary conditions and cross section contact, proper mesh division is carried out, the stress process of the specimen under horizontal and vertical loading is simulated, and the structural capacity curve is drawn. The results of simulation and test are compared and analyzed, which are in good agreement with each other, and verify the rationality of finite element simulation of the junction of prefabricated hollow bridge piers and caps, which is based on the experimental research and theoretical analysis. This paper makes a comparative analysis and objective evaluation of the two construction methods, and puts forward a reasonable construction process, which forms a more systematic construction method, and is successfully applied in practical engineering. On this basis, two national utility model patents have been authorized and one provincial construction method has been obtained. This paper provides the theoretical basis and construction method for the further improvement of the application of prefabricated concrete bridges. It is of certain significance to promote the application of prefabricated concrete bridges in engineering practice and to promote the development of building industrialization.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U443.2

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