【摘要】：波形鋼腹板-鋼管混凝土組合箱梁作為一種新型的組合箱梁橋結(jié)構(gòu),主要由混凝土頂板、波形鋼腹板和啞鈴型鋼管混凝土三部分組合而成。該種新型結(jié)構(gòu)箱梁橋與普通波形鋼腹板組合箱梁橋結(jié)構(gòu)上的最大不同在于其下底板的混凝土板被啞鈴型鋼管混凝土弦桿所代替。這種構(gòu)造很好地利用了鋼管混凝土在抗拉、抗壓上的力學(xué)優(yōu)點(diǎn);同時(shí)提高了結(jié)構(gòu)的整體性以及抗裂性能,在一定程度上減小了結(jié)構(gòu)梁體的自重,為大跨度橋梁的設(shè)計(jì)施工提供了另一種新的可能;另外就鋼管混凝土而言,其抗扭性能也明顯好于普通的鋼筋混凝土板,在抵抗汽車活荷載所造成的扭轉(zhuǎn)變形時(shí)可以充分發(fā)揮出其結(jié)構(gòu)特性。對(duì)于這種新型結(jié)構(gòu)的應(yīng)用,需要對(duì)其結(jié)構(gòu)相關(guān)的力學(xué)性能進(jìn)行系統(tǒng)的研究,但由于篇幅所限,本文只是重點(diǎn)進(jìn)行了波形鋼腹板-鋼管混凝土組合結(jié)構(gòu)箱梁橋在受到偏心荷載時(shí)的扭轉(zhuǎn)和畸變性能的研究,主要的工作和論證列舉如下:(1)首先對(duì)于相關(guān)的波形鋼腹板組合箱梁橋的國內(nèi)外研究現(xiàn)狀,以及其結(jié)構(gòu)特點(diǎn)進(jìn)行總結(jié),從而為波形鋼腹板-鋼管混凝土組合箱梁的扭轉(zhuǎn)分析提供重要的參考和依據(jù)。(2)根據(jù)已有的傳統(tǒng)波形鋼腹板的抗扭分析理論計(jì)算公式類比出該種新型結(jié)構(gòu)箱梁的扭轉(zhuǎn)畸變分析計(jì)算公式,通過對(duì)相關(guān)算例的理論計(jì)算結(jié)果與有限元模型計(jì)算值的對(duì)比,確定作者的建模分析思路的正確性。(3)選用有限元分析軟件MIDAS/FEA建立實(shí)體有限元模型并分別施加對(duì)稱荷載工況和偏心荷載工況進(jìn)行扭轉(zhuǎn)和畸變效應(yīng)分析。通過計(jì)算得到波形鋼腹板-鋼管混凝土組合箱梁橋在不同工況下的扭轉(zhuǎn)和畸變的正應(yīng)力,剪應(yīng)力以及撓度的放大系數(shù)值。對(duì)這些數(shù)據(jù)進(jìn)行相應(yīng)的總結(jié)分析,得出該種新型結(jié)構(gòu)箱梁的扭轉(zhuǎn)和畸變效應(yīng)的規(guī)律。與此同時(shí)將該種新型結(jié)構(gòu)箱梁橋的分析結(jié)果與同跨度,同梁高的相似傳統(tǒng)波形鋼腹板組合箱梁橋進(jìn)行比較分析得出該種新型組合結(jié)構(gòu)箱梁橋在抗扭承載力上較普通波形鋼腹板結(jié)構(gòu)箱梁有所提高。(4)通過分別改變腹板的傾角θ、波形鋼腹板的板厚、波形鋼腹板橫板段寬度、波形鋼腹板的彎折角度以及梁體結(jié)構(gòu)的高跨比這五種不同的結(jié)構(gòu)參數(shù)來分析每一種單一結(jié)構(gòu)參數(shù)的變化對(duì)新型結(jié)構(gòu)箱梁扭轉(zhuǎn)和畸變效應(yīng)的影響,得出其變化的一般規(guī)律,確定該種新型結(jié)構(gòu)箱梁橋的最佳尺寸范圍。
[Abstract]:As a new type of composite box girder bridge, the composite box girder with corrugated steel web and concrete filled steel tube is composed of concrete roof, corrugated steel web and dumbbell-shaped concrete filled steel tube. The biggest difference between the new type of box girder bridge and the ordinary corrugated steel web composite box girder bridge is that the concrete slab of the lower floor is replaced by the dumbbell-shaped concrete filled steel tube chord. This structure makes good use of the mechanical advantages of concrete-filled steel tube in tensile and compressive resistance, improves the integrity and crack resistance of the structure, and reduces the weight of the structure beam to a certain extent. It also provides a new possibility for the design and construction of long-span bridges. In addition, the torsional resistance of concrete-filled steel tube is obviously better than that of ordinary reinforced concrete slabs. When resisting the torsional deformation caused by the living load of the automobile, it can give full play to its structural characteristics. For the application of this new type of structure, it is necessary to make a systematic study on the mechanical properties related to its structure, but due to space constraints, In this paper, the torsion and distortion behavior of corrugated steel-web concrete-filled steel tube composite structure box girder bridge under eccentric load is studied. The main work and argumentation are listed as follows: (1) the domestic and foreign research status of the corrugated steel web composite box girder bridge and its structural characteristics are summarized. This provides an important reference and basis for torsional analysis of corrugated steel web and concrete filled steel tubular composite box girder. (2) the torsion of the new type of box girder is compared according to the traditional theoretical formula of torsional analysis of corrugated steel webs. Formula for calculation of rotational distortion analysis, By comparing the theoretical results of relevant examples with the calculated values of the finite element model, (3) the finite element analysis software MIDAS/FEA is used to establish the solid finite element model and apply symmetrical load and eccentric load to analyze the torsion and distortion effects respectively. The torsion and distortion normal stress, shear stress and magnification factor of deflection of corrugated steel-web concrete filled steel tube composite box girder bridge under different working conditions were calculated. The torsion and distortion effects of the new structure box girder are obtained by summarizing and analyzing these data. At the same time, the analytical results of this new type of box girder bridge are compared with the same span. By comparing and analyzing the similar traditional corrugated steel web box girder bridge with the same beam height, it is concluded that the torsional bearing capacity of this new type of composite structure box girder bridge is higher than that of the ordinary corrugated steel web structure box girder bridge. (4) by changing the web plate respectively. The inclination 胃, the thickness of the corrugated steel web, Five different structural parameters, such as the width of the transverse section of the corrugated steel web, the bending angle of the corrugated steel web and the ratio of height to span of the beam structure, are used to analyze the effects of each single structural parameter on the torsion and distortion of the new type of box girder. The general law of its variation is obtained and the optimum size range of the new type of box girder bridge is determined.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U441

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本文編號(hào)：2145803