發(fā)布時(shí)間：2018-04-11 14:39

  本文選題：鋼橋面鋪裝 + CRRPC��； 參考：《湖南大學(xué)》2015年碩士論文

【摘要】：鋼與混凝土組合橋梁的力學(xué)性能與結(jié)合面的連接方式緊密相關(guān)。栓釘連接件是工程中常用的剪力連接件,其主要作用是傳遞兩者之間的界面剪力以及抵抗鋼梁與混凝土板之間的掀起作用。本文以栓釘作為鋼-薄層CRRPC(Co MPact Reinforced Reactive Powder Concrete)超高性能輕型組合橋面結(jié)構(gòu)剪力連接件,對其抗剪性能進(jìn)行了研究,主要完成了以下工作:從傳統(tǒng)鋼橋面鋪裝的使用現(xiàn)狀及其主要病害,概括了活性粉末混凝土(RPC)的主要材料性能,并與普通混凝土進(jìn)行的對比,引出了鋼-薄層CRRPC混凝土組合橋面結(jié)構(gòu)。本文重點(diǎn)關(guān)注了鋼-薄層CRRPC組合橋面結(jié)構(gòu)抗剪問題,對傳統(tǒng)剪力連接件的分類和特點(diǎn)進(jìn)行了敘述,以栓釘連接件作為研究對象,對其抗剪承載力性能、抗剪疲勞性能的研究現(xiàn)狀進(jìn)行了總結(jié)。結(jié)合有限元分析方法,研究了栓釘連接件在推出試驗(yàn)中的抗剪承載力、荷載滑移曲線和剪切剛度試驗(yàn)研究,試驗(yàn)結(jié)果表明:鋼板與CRRPC層間的粘結(jié)效應(yīng)對試件的力學(xué)性能影響較大,可以提高試件40%的抗剪承載力,降低31%的滑移量。若不考慮CRRPC與鋼板間粘結(jié)力,栓釘剪切剛度為52.5N/mm,反之為120.6N/mm�；谕瞥鲈囼�(yàn),研究應(yīng)力比和界面聯(lián)接方式對栓釘剪切疲勞壽命的影響,得到滑移-加載次數(shù)曲線,試驗(yàn)結(jié)果表明:應(yīng)力比是影響栓釘抗剪疲勞壽命關(guān)鍵因素之一,對于鋼板與CRRPC間存在粘結(jié)效應(yīng)的推出疲勞試驗(yàn),應(yīng)力比建議取0.4;鋼板與CRRPC間的粘結(jié)效應(yīng)是影響疲勞壽命另一重要因素,對于存在粘結(jié)效應(yīng)的推出試件,在0.5的應(yīng)力比下等效疲勞壽命可以達(dá)到92.2萬次,但無粘結(jié)時(shí),疲勞壽命僅為16.9萬次。為了進(jìn)一步研究栓釘連接件在鋼-薄層CRRPC組合橋面結(jié)構(gòu)中的整體受力性能,本文對岳陽洞庭湖二橋主梁單節(jié)段進(jìn)行了有限元靜力分析。研究表明:栓釘?shù)幕屏亢图魬?yīng)力分布特點(diǎn)相對一致,由跨中向梁端增長,但最大滑移量和最大剪應(yīng)力并不在梁端,這與材料力學(xué)純理論分析結(jié)果并不相同。最后進(jìn)行了跨中加載梁式疲勞試驗(yàn),試驗(yàn)表明:栓釘間距為125mm×125mm時(shí),即使鋼板與CRRPC間不存在粘結(jié)效應(yīng),在等效實(shí)橋應(yīng)力幅下經(jīng)過5912.2萬次疲勞加載,組合梁界面仍沒有發(fā)生疲勞破壞。
[Abstract]:The mechanical properties of steel-concrete composite bridges are closely related to the connection mode of the joints.Pin joint is a commonly used shear connection in engineering. Its main function is to transfer the interfacial shear force between them and to resist the lift between steel beam and concrete slab.In this paper, the shear properties of light-duty composite deck structure with ultra-high performance are studied with stud as steel-thin-layer CRRPC(Co MPact Reinforced Reactive Powder crete. The main work is as follows: from the use of traditional steel deck pavement and its main diseases,The main material properties of reactive powder concrete (RPCs) are summarized, and compared with ordinary concrete, the steel-thin CRRPC concrete composite deck structure is introduced.This paper focuses on the shear resistance of steel-thin-layer CRRPC composite deck structure, and describes the classification and characteristics of the traditional shear connectors.The research status of shear fatigue properties is summarized.Combined with the finite element analysis method, the shear bearing capacity, load-slip curve and shear stiffness of the stud joint in the push-out test are studied.The experimental results show that the bond effect between the steel plate and the CRRPC layer has a great effect on the mechanical properties of the specimens, which can increase the shear strength of the specimens by 40% and reduce the slip by 31%.If the bonding force between CRRPC and steel plate is not taken into account, the shear stiffness of the bolt is 52.5 N / mm and 120.6N / mmmmm.The influence of stress ratio and interface connection on the shear fatigue life of bolt is studied, and the slip loading times curve is obtained. The test results show that the stress ratio is one of the key factors affecting the shear fatigue life of bolt.The stress ratio between steel plate and CRRPC is suggested to be 0.4. The bond effect between steel plate and CRRPC is another important factor affecting fatigue life.The equivalent fatigue life can reach 922000 times at the stress ratio of 0.5, but the fatigue life is only 169000 times when the bond is unbonded.The results show that the slip amount and shear stress distribution of the studs are relatively consistent, increasing from the middle span to the end of the beam, but the maximum slip amount and the maximum shear stress are not at the end of the beam, which is different from the results of pure theoretical analysis of material mechanics.Finally, the fatigue test of mid-span loading beam is carried out. The results show that when the pin spacing is 125mm 脳 125mm, even if there is no bond effect between steel plate and CRRPC, it is subjected to 59.122 million times of fatigue loading under the stress amplitude of iso-effect bridge.There is no fatigue failure at the interface of the composite beam.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U441

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本文編號：1736413