【摘要】：波紋鋼腹板箱梁橋作為一種新型的橋梁結(jié)構(gòu)形式,具有非常明顯的優(yōu)點,可以有效的改善波紋鋼腹板箱梁的受力性能。它主要由混凝土頂板、底板、波紋鋼腹板和預(yù)應(yīng)力鋼索組成。在以往結(jié)構(gòu)抗剪設(shè)計中只考慮波紋鋼腹板的抗剪性能,而在實際建造的大跨徑波紋鋼腹板箱梁橋中,零號塊墩頂附近一般都會布置內(nèi)襯混凝土,用以輔助波紋鋼腹板進(jìn)行受力,這樣內(nèi)襯混凝土?xí)绊懙讲y鋼腹板的受力性能。為了更加明晰這種影響規(guī)律,使得對于波紋鋼腹板箱梁橋的研究更加完善,進(jìn)行內(nèi)襯混凝土對結(jié)構(gòu)抗彎及抗剪力學(xué)性能影響規(guī)律的研究十分必要。論文查閱和總結(jié)了大量國內(nèi)外研究資料,介紹了波紋鋼腹板箱梁橋的發(fā)展史及國內(nèi)外研究現(xiàn)狀,闡述了波紋鋼腹板箱梁橋彎曲、剪切計算分析理論。論文以某波紋鋼腹板組合連續(xù)箱梁橋為工程背景,建立不同厚度及長度的內(nèi)襯混凝土有限元實體模型,通過有限元分析軟件對比分析。對其在不同內(nèi)襯混凝土布置狀況下橫截面正應(yīng)變沿梁高分布規(guī)律、剪力滯效應(yīng)、撓度、內(nèi)襯混凝土承擔(dān)剪力比值及彈性屈曲極限荷載等進(jìn)行深入分析研究。結(jié)果表明:布置內(nèi)襯混凝土可使混凝土頂?shù)装褰孛嬲龖?yīng)變減小,鋼腹板截面正應(yīng)變增大;內(nèi)襯混凝土對墩頂負(fù)彎矩區(qū)段抗彎性能影響較大,對跨中撓度影響非常小;布置內(nèi)襯混凝土可以使混凝土頂?shù)装寮袅?yīng)減小;內(nèi)襯混凝土厚度超過40cm時,截面剪力主要由內(nèi)襯混凝土承擔(dān);內(nèi)襯混凝土長度不是越長越好;內(nèi)襯混凝土可以限制鋼腹板的橫向變形,使鋼腹板屈曲前剪應(yīng)力明顯降低;內(nèi)襯混凝土厚度超過80cm時,鋼腹板屈曲極限荷載的減小幅度趨于穩(wěn)定。
[Abstract]:Corrugated steel web box girder bridge, as a new type of bridge structure, has obvious advantages and can effectively improve the mechanical performance of corrugated steel web box girder. It is mainly composed of concrete roof, floor, corrugated steel web and prestressed steel cable. In the past, the shear resistance of corrugated steel webs was only considered in the structural shear design, but in the actual long-span corrugated steel web box girder bridges, concrete lining was usually arranged near the top of block zero piers to assist the corrugated steel webs to carry out the force. In this way, concrete lining will affect the mechanical performance of corrugated steel web. In order to make the research of corrugated steel web box girder bridge more perfect, it is necessary to study the influence of lining concrete on the flexural and shear mechanical properties of the structure. This paper reviews and summarizes a large number of domestic and international research materials, introduces the development history of corrugated steel web box girder bridge and the present research situation at home and abroad, and expounds the theory of bending and shear analysis of corrugated steel web box girder bridge. Taking a corrugated steel web composite continuous box girder bridge as the engineering background, the finite element solid model of lined concrete with different thickness and length is established in this paper, and the finite element analysis software is used to compare and analyze the model. The distribution law of normal strain along the beam height, shear lag effect, deflection, shear ratio of lining concrete and ultimate load of elastic buckling are deeply analyzed and studied. The results show that the positive strain of concrete roof and bottom slab can be decreased and the positive strain of steel web section will be increased by placing lined concrete, and the influence of lining concrete on the flexural behavior of the negative moment section of pier top is great, and the influence on the deflection of span is very small. When the thickness of lining concrete exceeds 40cm, the cross-section shear force is mainly borne by lining concrete, and the length of lining concrete is not the longer the better. The concrete lining can limit the transverse deformation of the steel web and reduce the shear stress of the steel web before buckling obviously, and when the thickness of the lining concrete exceeds 80cm, the limit load of the steel web buckling tends to be stable.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U441

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