【摘要】：閘墩是水利樞紐中泄水建筑物的主要組成部分,是承受閘門(mén)作用力,保證泄水建筑物正常運(yùn)行的關(guān)鍵性建筑物之一。隨著水利水電事業(yè)的發(fā)展,泄水建筑物擋水閘門(mén)的工作水頭不斷提高,閘墩承受的作用力不斷加大,常規(guī)鋼筋混凝土閘墩已日益難滿足安全有效的運(yùn)行需求,因此很有必要尋求一種新型閘墩結(jié)構(gòu),確保閘墩在大推力作用下能可靠運(yùn)行。根據(jù)現(xiàn)有研究表明,型鋼混凝土(SRC)結(jié)構(gòu)承載能力高、剛性大,具有良好的延性和耗能性,將其應(yīng)用于閘墩中能較好的滿足大推力情況下閘墩可靠運(yùn)行的要求。但目前國(guó)內(nèi)外對(duì)于型鋼混凝土閘墩的研究較少,并且這些研究都避開(kāi)了型鋼混凝土粘結(jié)滑移問(wèn)題,而型鋼混凝土結(jié)構(gòu)中型鋼與混凝土協(xié)同工作的基礎(chǔ)就是型鋼與混凝土之間的自然粘結(jié),靠這種粘結(jié)作用才能夠發(fā)揮出型鋼混凝土結(jié)構(gòu)的優(yōu)點(diǎn)。為揭示型鋼與混凝土間的粘結(jié)滑移特性對(duì)閘墩工作性能的影響,本文在現(xiàn)有研究成果基礎(chǔ)之上,結(jié)合擬建工程,在數(shù)值分析中引入彈簧單元分析了型鋼混凝土粘結(jié)特性對(duì)閘墩工作性能的影響,進(jìn)一步完善了型鋼混凝土閘墩的研究。本文利用ANSYS有限元軟件進(jìn)行數(shù)值模擬分析,分別從型鋼與混凝土間的粘結(jié)滑移、閘墩的位移、應(yīng)力及裂縫等方面,分析了型鋼混凝土粘結(jié)特性對(duì)閘墩工作性能的影響,在此基礎(chǔ)上進(jìn)一步探討了不同保護(hù)層厚度和不同型鋼埋置長(zhǎng)度對(duì)型鋼混凝土粘結(jié)性能和閘墩工作性能的影響。研究分析表明：(1)相對(duì)于房屋結(jié)構(gòu)中的型鋼混凝土梁和柱,型鋼混凝土閘墩的型鋼與混凝土發(fā)生粘結(jié)滑移的時(shí)機(jī)更早,初始滑移荷載為其極限荷載的50%-65%。(2)隨著荷載的增加,沿型鋼埋置長(zhǎng)度方向,牛腿處的型鋼混凝土粘結(jié)滑移呈現(xiàn)出類(lèi)似對(duì)數(shù)分布的分布趨勢(shì),而墩體內(nèi)的型鋼混凝土粘結(jié)滑移則呈現(xiàn)出類(lèi)似指數(shù)分布的分布趨勢(shì)。(3)型鋼混凝土的粘結(jié)特性對(duì)閘墩的整體位移沒(méi)有太大影響,但對(duì)局部位移影響較大。(4)型鋼混凝土的粘結(jié)性能開(kāi)始先隨保護(hù)層厚度和型鋼埋置長(zhǎng)度的增加而提升,當(dāng)保護(hù)層厚度和型鋼埋置長(zhǎng)度增加到一定值時(shí),型鋼混凝土的粘結(jié)性能將不再提升,趨于平穩(wěn)。(5)型鋼混凝土出現(xiàn)粘結(jié)滑移前,閘墩工作性能幾乎不受型鋼保護(hù)層厚度和型鋼埋置長(zhǎng)度的影響；型鋼混凝土出現(xiàn)粘結(jié)滑移后,保護(hù)層厚度、型鋼埋置長(zhǎng)度對(duì)閘墩工作性能的影響較大,并且兩者的影響有所差異。(6)保護(hù)層厚度對(duì)閘墩各階段的裂縫發(fā)展趨勢(shì)的影響不明顯,但是對(duì)各裂縫階段的開(kāi)裂荷載有著很大影響；型鋼埋置長(zhǎng)度對(duì)閘墩各階段的開(kāi)裂荷載無(wú)明顯影響,但相同荷載下,閘墩裂縫分布范圍則隨型鋼埋置長(zhǎng)度的增加而減小。
[Abstract]:The pier is the main component of the drainage structure in the water conservancy project. It is one of the key buildings to bear the force of the gate and ensure the normal operation of the drainage structure. With the development of water conservancy and hydropower industry, the working head of the sluice gate of the drainage structure is increasing, and the acting force of the pier is increasing, so it is increasingly difficult for the conventional reinforced concrete pier to meet the requirements of safe and effective operation. Therefore, it is necessary to seek a new type of pier structure to ensure the reliable operation of the pier under the action of large thrust. According to the existing research, the steel reinforced concrete (SRC) (SRC) structure has high bearing capacity, high rigidity, good ductility and energy dissipation, and its application in the pier can better meet the requirements of reliable operation of the pier under the condition of large thrust. However, there are few researches on SRC pier at home and abroad, and these researches have avoided the problem of SRC bond-slip. The natural bond between SRC and SRC is the foundation of SRC working together, and the advantages of SRC can be brought into play by this kind of bond. In order to reveal the influence of the bond-slip characteristics between steel and concrete on the piers' working performance, this paper combines the existing research results with the proposed project. In the numerical analysis, spring element is introduced to analyze the influence of the bond characteristics of SRC on the working performance of the pier, and the research of SRC pier is further improved. In this paper, ANSYS finite element software is used to simulate and analyze the effect of bond characteristics of steel reinforced concrete on the working performance of pier from the aspects of bond slip between section steel and concrete, displacement of pier, stress and crack, etc. On the basis of this, the effects of different protective layer thickness and different section steel embedding length on the bond performance of steel reinforced concrete and the working performance of pier are discussed. The results show that: (1) compared with the steel reinforced concrete beams and columns in the building structure, the time of bond slip between the steel section and the concrete of the steel reinforced concrete sluice pier is earlier than that of the steel reinforced concrete beam and column in the building structure. The initial slip load is between 50 and 65 of its ultimate load. (2) with the increase of load, along with the length of section steel embedded, the bond-slip of steel reinforced concrete at the corbel shows a similar logarithmic distribution trend. The bond slip of SRC in the pier shows a similar exponential distribution trend. (3) the bond characteristics of SRC have no great effect on the overall displacement of the pier. However, the local displacement is greatly affected. (4) the bond performance of SRC begins to increase with the increase of cover thickness and section steel embedding length, and when the cover thickness and section steel buried length increase to a certain value, The bond behavior of SRC will no longer be improved and tends to be stable. (5) before the SRC appears bond-slip, the working performance of the pier is almost independent of the thickness of the steel cover and the embedded length of the section steel; After bond slip occurs in SRC, the thickness of the protective layer and the embedded length of the section steel have a great influence on the working performance of the pier. And the influence of the two is different. (6) the thickness of protective layer has no obvious influence on the development trend of cracks in each stage of pier, but has a great influence on the cracking load of each stage of crack; The length of section steel buried has no obvious influence on the cracking load of pier at each stage, but the crack distribution range of pier decreases with the length of section steel buried under the same load.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：TV662.2

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