寬箱連續(xù)梁橋施工監(jiān)控及剪力滯效應(yīng)研究
發(fā)布時(shí)間：2018-08-04 14:00
【摘要】：箱形截面是大跨徑橋梁應(yīng)用最為廣泛的一種截面形式,隨著交通量的增大和科學(xué)技術(shù)的進(jìn)步,箱形截面的寬度越來越大。為了保證寬箱連續(xù)箱梁橋在施工過程中和成橋后的線形及應(yīng)力符合設(shè)計(jì)意圖和要求,因此需開展橋梁施工監(jiān)控及相關(guān)研究工作。本文以周口市沙潁河橋工程為依托,開展了寬箱連續(xù)梁橋施工監(jiān)控工作;針對寬箱梁較為明顯的剪力滯效應(yīng),基于有限元模型及理論模型研究了剪力滯效應(yīng)。本文主要完成了以下工作:(1)采用有限元軟件Midas/Civil和Midas/FEA,分別建立依托工程梁單元和空間實(shí)體單元模型,為沙潁河橋的施工監(jiān)控和剪力滯研究奠定了基礎(chǔ)。(2)針對沙潁河橋單箱4室寬箱梁的特點(diǎn),制定了橋梁施工監(jiān)控方案,實(shí)施橋梁的線形監(jiān)控及應(yīng)力監(jiān)控。對橋梁施工線形做出合理推測,由預(yù)拱度、支架或掛籃預(yù)壓變形等數(shù)據(jù)計(jì)算得到立模標(biāo)高,對各節(jié)梁段施工進(jìn)行線形控制,最終使沙潁河橋成橋?qū)崪y線形與預(yù)期線形符合良好;在剔除溫度對實(shí)測應(yīng)力的影響及考慮剪力滯效應(yīng)對理論計(jì)算值影響后,應(yīng)力理論值與實(shí)測值變化趨勢一致,實(shí)測應(yīng)力值在合理范圍內(nèi)變化,確保了沙潁河橋施工安全。(3)研究施工過程對寬箱梁剪力滯效應(yīng)的影響。以0#塊梁段施工為例,分別在僅有縱向預(yù)應(yīng)力作用以及在縱、橫向預(yù)應(yīng)力共同作用下,計(jì)算控制截面頂、底板剪力滯系數(shù)變化,得到預(yù)應(yīng)力作用對寬箱梁剪力滯效應(yīng)影響的一般規(guī)律;以全橋施工過程為例,在各個(gè)施工階段,考察混凝土澆筑完成后及縱向預(yù)應(yīng)力施加后對當(dāng)前施工梁段剪力滯效應(yīng)的影響;在成橋階段,針對不同的控制截面,探討預(yù)應(yīng)力作用對寬箱梁剪力滯效應(yīng)的影響規(guī)律。
[Abstract]:Box section is one of the most widely used cross-sections of long-span bridges. With the increase of traffic volume and the progress of science and technology, the width of box section becomes larger and larger. In order to ensure that the alignment and stress of the wide box continuous box girder bridge in the construction process and after the completion of the bridge accord with the design intention and requirements, it is necessary to carry out the bridge construction monitoring and related research work. Based on the Shaying River Bridge Project in Zhoukou City, this paper carried out the construction monitoring work of the wide box continuous girder bridge, and studied the shear lag effect based on the finite element model and the theoretical model for the obvious shear lag effect of the wide box girder. The main work of this paper is as follows: (1) using the finite element software Midas/Civil and Midas / FEAA, the supporting beam element model and the spatial solid element model are established, respectively. It lays a foundation for the construction monitoring and shear lag research of Shaying River Bridge. (2) according to the characteristics of single box 4 room wide box girder of Shaying River Bridge, the bridge construction monitoring scheme is established, and the linear monitoring and stress monitoring of the bridge is carried out. Reasonable conjecture is made on the line shape of the bridge construction, the elevation of the vertical formwork is obtained by calculating the pre-arch degree, the deformation of the support or the hanging basket, and the alignment control of the construction of each section of beam is carried out, finally, the measured line shape of the completed bridge of Shaying River Bridge is in good agreement with the expected line shape. After excluding the effect of temperature on the measured stress and considering the influence of shear lag effect on the theoretical calculation value, the variation trend of the theoretical stress value is consistent with the measured value, and the measured stress value changes within a reasonable range. The construction safety of Shaying River Bridge is ensured. (3) the influence of construction process on shear lag effect of wide box girder is studied. Taking the construction of the beam section of 0# block as an example, the shear lag coefficient of the top and bottom slab of the control section is calculated under the action of only longitudinal prestress and the combined action of longitudinal and transverse prestressing, respectively. The general law of the influence of prestress on shear lag effect of wide box girder is obtained, taking the whole bridge construction process as an example, the influence of concrete pouring and longitudinal prestressing on shear lag effect of beam segment is investigated in each construction stage. In the stage of bridge completion, the influence of prestress on shear lag effect of wide box girder is discussed according to different control sections.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U441;U445.4
本文編號：2164110
[Abstract]:Box section is one of the most widely used cross-sections of long-span bridges. With the increase of traffic volume and the progress of science and technology, the width of box section becomes larger and larger. In order to ensure that the alignment and stress of the wide box continuous box girder bridge in the construction process and after the completion of the bridge accord with the design intention and requirements, it is necessary to carry out the bridge construction monitoring and related research work. Based on the Shaying River Bridge Project in Zhoukou City, this paper carried out the construction monitoring work of the wide box continuous girder bridge, and studied the shear lag effect based on the finite element model and the theoretical model for the obvious shear lag effect of the wide box girder. The main work of this paper is as follows: (1) using the finite element software Midas/Civil and Midas / FEAA, the supporting beam element model and the spatial solid element model are established, respectively. It lays a foundation for the construction monitoring and shear lag research of Shaying River Bridge. (2) according to the characteristics of single box 4 room wide box girder of Shaying River Bridge, the bridge construction monitoring scheme is established, and the linear monitoring and stress monitoring of the bridge is carried out. Reasonable conjecture is made on the line shape of the bridge construction, the elevation of the vertical formwork is obtained by calculating the pre-arch degree, the deformation of the support or the hanging basket, and the alignment control of the construction of each section of beam is carried out, finally, the measured line shape of the completed bridge of Shaying River Bridge is in good agreement with the expected line shape. After excluding the effect of temperature on the measured stress and considering the influence of shear lag effect on the theoretical calculation value, the variation trend of the theoretical stress value is consistent with the measured value, and the measured stress value changes within a reasonable range. The construction safety of Shaying River Bridge is ensured. (3) the influence of construction process on shear lag effect of wide box girder is studied. Taking the construction of the beam section of 0# block as an example, the shear lag coefficient of the top and bottom slab of the control section is calculated under the action of only longitudinal prestress and the combined action of longitudinal and transverse prestressing, respectively. The general law of the influence of prestress on shear lag effect of wide box girder is obtained, taking the whole bridge construction process as an example, the influence of concrete pouring and longitudinal prestressing on shear lag effect of beam segment is investigated in each construction stage. In the stage of bridge completion, the influence of prestress on shear lag effect of wide box girder is discussed according to different control sections.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U441;U445.4
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，本文編號：2164110
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