【摘要】：正交異性鋼橋面板自上世紀(jì)五十年代出現(xiàn)以來(lái),由于其具有諸如自重輕、架設(shè)方便、節(jié)省材料等優(yōu)點(diǎn)而獲得了廣泛的應(yīng)用,世界各地先后修建了一大批采用正交異性鋼橋面板的大跨橋梁,然而采用瀝青混合料鋪裝的正交異性鋼橋面板在使用過(guò)程中極易出現(xiàn)鋼梁的疲勞破壞與鋪裝層的車(chē)轍、開(kāi)裂等病害。為了根治正交異性鋼橋面板的兩大頑疾,項(xiàng)目組將超高性能混凝土(以下簡(jiǎn)稱(chēng)UHPC)引入,與正交異性鋼板組合形成輕型組合橋面板,目前已有研究表明此種組合結(jié)構(gòu)能夠有效降低鋼梁疲勞細(xì)節(jié)應(yīng)力幅,并幾乎杜絕了鋪裝層開(kāi)裂的可能。本文研究對(duì)象為UHPC層厚度僅為35mm的正交異性鋼板-超薄UHPC組合橋面板,針對(duì)其界面抗剪性能主要完成了以下工作:(1)為了解決鋼-超薄UHPC組合橋面板由于UHPC層過(guò)薄而難以使用常規(guī)抗剪連接件形式的難題,提出了一種新型的抗剪連接件形式,即鋼筋網(wǎng)局部焊接抗剪連接件(以下簡(jiǎn)稱(chēng)焊接抗剪件)。設(shè)計(jì)并開(kāi)展了推出試驗(yàn),實(shí)測(cè)了50mm長(zhǎng)焊接抗剪件的抗剪承載力與抗剪剛度,得到了焊接抗剪件的荷載-滑移關(guān)系曲線(xiàn)。同時(shí)對(duì)推出試驗(yàn)全過(guò)程進(jìn)行了有限元模擬,在與試驗(yàn)結(jié)果進(jìn)行對(duì)比校核之后對(duì)焊接抗剪件進(jìn)行了參數(shù)分析。試驗(yàn)結(jié)果表明:焊接抗剪件的推出試驗(yàn)破壞過(guò)程屬于脆性破壞,破壞前試件變形較小,焊縫長(zhǎng)度為50mm的焊接抗剪件極限抗剪承載力為119k N,焊接抗剪件的線(xiàn)彈性抗剪剛度為1838k N/mm。計(jì)算結(jié)果表明:焊接抗剪件橫、縱向抗剪剛度差別不大,橫向抗剪承載力高于縱向抗剪承載力。隨著焊接抗剪件焊接長(zhǎng)度減小,橫、縱向抗剪承載力差值減小。抗剪承載力、抗剪剛度與焊接抗剪件長(zhǎng)度、縱向鋼筋直徑正相關(guān),隨著焊接抗剪件長(zhǎng)度和縱向鋼筋直徑的減小,其抗剪剛度與抗剪承載力均下降。(2)以潤(rùn)揚(yáng)長(zhǎng)江大橋?yàn)楣こ瘫尘?建立局部節(jié)段有限元模型,通過(guò)子模型技術(shù)研究了不同焊接抗剪件布置方案對(duì)UHPC層與鋼梁的受力性能影響。計(jì)算結(jié)果表明:抗剪連接件的布置方案對(duì)輕型組合橋面板UHPC層影響較大,而對(duì)鋼梁各組成部分影響較小。在單位面積焊接抗剪件焊縫面積一定時(shí),采用更小規(guī)格的焊接抗剪件即加大抗剪件布置密度,能夠減小UHPC底部橫、縱橋向應(yīng)力,降幅可達(dá)36%,從而增加其耐久性,在設(shè)計(jì)中應(yīng)予以考慮。同時(shí),增加布置密度同樣能夠減小鋼梁細(xì)節(jié)峰值應(yīng)力,增強(qiáng)界面連接程度能夠提高組合橋面系的受力性能。
[Abstract]:Orthotropic steel bridge panel has been widely used since its appearance in 1950s, because of its advantages such as light weight, convenient erection, saving materials, etc. A large number of large span bridges with orthotropic steel bridge panels have been built all over the world. However, the fatigue failure of steel beams and the rutting of pavement are easy to occur in the use of orthotropic steel bridge panels paved with asphalt mixture. A disease, such as cracking. In order to cure the two serious problems of orthotropic steel bridge panel, the project team introduced ultra-high performance concrete (UHPC) and combined with orthotropic steel plate to form light composite deck slab. It has been shown that this kind of composite structure can effectively reduce the fatigue detail stress amplitude of steel beam and almost eliminate the possibility of pavement cracking. The object of this paper is orthotropic steel plate and ultra-thin UHPC composite deck slab whose thickness of UHPC layer is only 35mm. Aiming at the shear properties of the interface, the following works have been accomplished: (1) in order to solve the problem that it is difficult for the steel-ultra-thin UHPC composite deck slab to use the conventional shear joint due to the thin UHPC layer, a new type of shear joint form is proposed. That is, steel mesh local welding shear joint (hereinafter referred to as welded shear parts). The shear bearing capacity and stiffness of 50mm long welded shear parts were measured and the load-slip relationship curves of welded shear specimens were obtained. At the same time, the finite element simulation was carried out in the whole process of launching test, and the parameters of the welded shearing parts were analyzed after comparing with the test results. The test results show that the failure process is brittle, the deformation of the specimens before failure is small, and the ultimate shear strength of welded shear parts with weld length of 50mm is 119kN. The linear elastic shear stiffness of welded shears is 1838kN / mmm. The results show that the transverse and longitudinal shear stiffness of welded shearing parts are not different, and the transverse shear strength is higher than the longitudinal shear bearing capacity. With the decrease of welding length, the difference between transverse and longitudinal shear bearing capacity decreases. The shear bearing capacity, shear stiffness and the length of welded shear and the diameter of longitudinal steel bar are positively correlated with the length of welded shear piece and the diameter of longitudinal steel bar. The shear stiffness and shear bearing capacity of the bridge decrease. (2) taking Runyang Yangtze River Bridge as the engineering background, the local segment finite element model is established. The influence of different arrangement schemes of welded shear resistance on the mechanical properties of UHPC layer and steel beam was studied by submodel technique. The results show that the arrangement of shear-resistant joints has great influence on the UHPC layer of light-duty composite deck slab, but has little effect on the components of steel beam. When the weld area of welded shear-resistant parts per unit area is fixed, using a smaller size of welded shear-resistant parts, that is, increasing the arrangement density of shear-resistant pieces, can reduce the transverse and longitudinal bridge stresses at the bottom of UHPC, and the decrease can be up to 36%, thus increasing its durability. It should be taken into account in the design. At the same time, increasing the arrangement density can also reduce the peak stress of the steel beam detail, and enhance the interface connection degree to improve the mechanical performance of the composite bridge deck system.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U441

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