【摘要】：本文首先對河南省道高速公路安陽新鄉(xiāng)段加寬一期改造工程某橋進行有限元分析。通過考慮材料非線性,截面接觸非線性等因素,探究鉸縫和空心板之間的應力應變對結(jié)構的影響,并確定橋梁鉸縫傳力具有明顯的局部性。集中荷載作用于空心板橋梁時,荷載梁兩側(cè)鉸縫受力最大,其它鉸縫受力較小,且鉸縫受力主要集中于荷載作用的位置,其余位置均較小。其次通過設計中間布置鉸縫的簡支梁進行試驗,即一種空心板橋鉸縫承載力試驗試件。對鉸縫構造的破壞形態(tài),開裂荷載,裂縫寬度,鉸縫張開量等破壞模式進行試驗研究。以此探究鉸縫受力狀況,極限荷載,以及破壞機理,同時通過有限元軟件ABAQUS對試驗構件進行非線性分析以及試驗尺寸效應研究,確定鉸縫受力范圍以及剪力傳遞分布機理。主要結(jié)論如下:均布荷載作用下,鉸縫傳遞荷載范圍成橢圓形分布,作用區(qū)域縱、橫向長度分別為5倍和3倍的空心板寬度。試驗過程中,鉸縫腹部承受較大荷載,增加鉸縫深度是控制鉸縫破壞和增強鉸接板橫向剛度的有效措施。構件破壞的主要原因是鉸縫抗剪鋼筋錨固長度不夠。鉸縫混凝土破壞主要的兩個重要因素是鉸縫內(nèi)部的橫向拉應力和豎向剪應力。
[Abstract]:In this paper, the finite element analysis of a bridge in the first stage widening project of Anyang Xinxiang Section of Henan Province Road Expressway is carried out. The influence of stress and strain between hinged joints and hollow slabs on the structure is investigated by considering material nonlinearity and cross-section contact nonlinearity, and it is determined that the transmission force of bridge hinged joints has obvious locality. When the concentrated load is applied to the hollow slab bridge, the stress of the hinge joint on both sides of the load beam is the largest, while that of the other joints is small, and the stress of the hinge joint is mainly concentrated in the position where the load is acted on, and the other positions are smaller. Secondly, simply supported beams with hinged joints are designed to test the bearing capacity of hinged joints of hollow slab bridges. The failure modes of hinged joints, such as failure mode, crack load, crack width, joint opening and so on, are studied experimentally. In this paper, the stress condition, ultimate load and failure mechanism of hinged joints are discussed. At the same time, the nonlinear analysis and size effect of test members are carried out by finite element software ABAQUS to determine the stress range and shear force transfer distribution mechanism of hinged joints. The main conclusions are as follows: under uniform load, the load range of hinge joints is elliptical, and the width of hollow slab is 5 times and 3 times of transverse length, respectively. In the process of test, the joint underside is subjected to a large load, and increasing the depth of the hinge joint is an effective measure to control the failure of the hinge joint and enhance the transverse stiffness of the hinged plate. The main reason for the failure of the member is that the anchor length of the hinge joint shear-resistant steel bar is not enough. The transverse tensile stress and vertical shear stress are the two main factors in the failure of hinged concrete.
【學位授予單位】：華北水利水電大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U441

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