本文關(guān)鍵詞：裝配式板梁橋鉸縫粘結(jié)抗剪性能研究　出處：《安徽工業(yè)大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 裝配式板梁橋 鉸縫 接觸面 粘結(jié)性能 橫向分布 抗剪試驗(yàn) 承載力

【摘要】：裝配式板梁橋是我國中小跨徑橋梁中使用普遍的一種橋型，而鉸縫損傷則是該類橋型上部結(jié)構(gòu)出現(xiàn)問題的主要原因。檢測結(jié)果表明，，鉸縫損傷會降低裝配式板梁橋整體受力性能，嚴(yán)重者甚至出現(xiàn)單板受力情況，產(chǎn)生橋梁安全事故。本文以裝配式板梁橋鉸縫損傷為對象開展研究，主要內(nèi)容如下： 首先，基于新舊混凝土粘結(jié)機(jī)理、鉸縫混凝土受力特點(diǎn)和破壞特征，針對有限元軟件Abaqus接觸模塊中面與面之間粘結(jié)行為“traction-separation”關(guān)系曲線進(jìn)行研究，結(jié)合相關(guān)研究文獻(xiàn)，確定了“traction-separation”關(guān)系曲線中接觸面粘結(jié)滑移剛度、粘結(jié)應(yīng)力界限、最終滑移值。同時，建立實(shí)橋模型進(jìn)行分析，與實(shí)橋荷載試驗(yàn)對比，兩者結(jié)果吻合度很好，表明了文中有限元建模的正確性。 其次，制作了五組鉸縫抗剪試件，試件分別采用不同鉸縫接觸面構(gòu)造形式，對比研究不同接觸面構(gòu)造形式的鉸縫承載力大小，試驗(yàn)結(jié)果表明，采用鉸縫抗剪鋼筋可以提高鉸縫極限承載力，但對接觸面粘結(jié)滑移剛度起減小作用；采用較小配鋼率鋼板抗剪鍵能夠提高接觸面粘結(jié)滑移剛度；普通素混凝土鉸縫形式接觸面法向粘結(jié)應(yīng)力小于理論計(jì)算值；在接觸面設(shè)置抗剪鋼筋和鋼板抗剪鍵均能提高接觸面法向和切向粘結(jié)應(yīng)力極限。 最后，根據(jù)試驗(yàn)結(jié)果，進(jìn)一步提出了鋼板抗剪鍵和抗剪鋼筋組合使用的鉸縫接觸面構(gòu)造形式，將該構(gòu)造形式與普通素混凝土鉸縫形式以及板梁整體現(xiàn)澆無鉸縫形式進(jìn)行數(shù)值分析，對比三者之間橫向剛度和承載力的區(qū)別。結(jié)果表明，采用鋼板抗剪鍵和抗剪鋼筋組合使用的鉸縫接觸面構(gòu)造形式可以大大提高板梁間橫向剛度，鉸縫承載力也可以得到提高。
[Abstract]:Fabricated slab girder bridge is a common type of bridge used in medium and small span bridges in China. The damage of hinged joints is the main cause of the problems of this type of bridge superstructure. The test results show that. Joint damage will reduce the overall mechanical performance of prefabricated slab girder bridge, or even single plate force situation, resulting in bridge safety accidents. This paper takes the hinge joint damage of prefabricated slab beam bridge as the object of study. The main contents are as follows: Firstly, based on the bond mechanism of new and old concrete, the stress characteristics and failure characteristics of hinged concrete are discussed. The bond behavior "traction-separation" relation curve between the middle plane and the plane of the finite element software Abaqus contact module is studied. The bond-slip stiffness, bond stress limit and ultimate slip value of the contact surface in the "traction-separation" curve are determined. At the same time, the real bridge model is established for analysis. Compared with the actual bridge load test, the results are in good agreement with each other, which indicates the correctness of the finite element method. Secondly, five groups of joint shear specimens are made. The joints are constructed in different joints, and the bearing capacity of joints with different joints is compared. The test results show that. The ultimate bearing capacity of hinged joints can be increased by using shearing steel bar, but the bond-slip stiffness of contact surface can be reduced. The bond slip stiffness of the contact surface can be improved by using the shear bond of the steel plate with small proportion of steel. The normal bond stress of the common plain concrete joint is less than the theoretical value. The normal and tangential bond stress limit of the contact surface can be increased by setting shear bar and steel plate shear bond on the contact surface. Finally, according to the test results, the joint joint structure of steel plate and shear bar is further proposed. The structural form is numerically analyzed with plain concrete hinge joint and slab beam cast-in-situ without hinged joint, and the difference of transverse stiffness and bearing capacity between them is compared. The transverse stiffness and the bearing capacity of hinged joints can be greatly improved by using the joint structure of steel plate and steel bar combined with shear bar.
【學(xué)位授予單位】：安徽工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441

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