本文關鍵詞： 桁腹式組合桁梁橋節(jié)點 剪力滯效應 受力性能 破壞形態(tài)　出處：《哈爾濱工業(yè)大學》2015年碩士論文　論文類型：學位論文

【摘要】：桁腹式組合桁梁橋憑借良好的經(jīng)濟性、更強的跨越能力和建筑維護方便的特點,在實際工程中具有廣闊的應用前景。桁腹式組合桁梁橋節(jié)點是桁腹式組合桁梁橋的關鍵構件,目前對桁腹式組合桁梁橋節(jié)點的水平抗剪性能認識較深入,對考慮腹桿彎矩、橋面板的豎向撓度以及對節(jié)點的影響下的受力性能、塑性分布和破壞形態(tài),以及節(jié)點非連續(xù)地分布引起的剪力滯效應均缺乏足夠的了解。本文擬通過有限元模擬和試驗研究,深入了解桁腹式組合桁梁橋節(jié)點的受力性能、構件塑性分布和破壞模式,以及桁腹式組合桁梁橋的剪力滯效應。本文的內(nèi)容主要包括以下三個方面:桁腹式組合桁梁橋節(jié)點的非線性有限元分析。通過ABAQUS建立桁腹式組合桁梁橋節(jié)點考慮腹桿彎矩、橋面板的豎向撓度以及對節(jié)點的影響的模型,進而進行非線性分析,從荷載-位移曲線、構件的塑性分布和破壞模式三個方面分析節(jié)點在復雜邊界條件下的工作性能。模擬結果顯示,節(jié)點的荷載-位移曲線飽滿,屈服點不明顯;構件的塑性分布與破壞模式與節(jié)點水平抗剪試驗存在較大差異。桁腹式組合桁梁橋節(jié)點試驗研究與參數(shù)分析。開展桁腹式組合桁梁橋節(jié)點試件在復雜邊界條件下的反復加載試驗,分析試件加載端的荷載-位移曲線、骨架曲線、構件應力和破壞形態(tài)。利用試驗數(shù)據(jù)驗證ABAQUS模擬的有效性,并進行復雜邊界條件下節(jié)點的參數(shù)分析。試驗、模擬結果表明,荷載-位移曲線強化現(xiàn)象、卸載剛度退化明顯;腹桿偏心受力,應力集中在頂端;試件的裂縫集中在外包圍混凝土上;外包圍混凝土等級、穿孔鋼筋直徑和有無貫通鋼筋對屈服強度的影響較小,極限強度和延性的影響較大。簡支桁腹式組合桁梁橋剪力滯效應研究。通過ABAQUS有限元模擬簡支桁腹式組合桁梁橋在自重下的工況,以節(jié)點為觀察對象,在寬度和長度兩個維度上量化分析橋面板的縱向正應力、剪力滯系數(shù)和有效寬度的規(guī)律。模擬結果顯示,橋面板上同時存在剪力滯效應和負剪力滯效應,在節(jié)點處效應最嚴重,各節(jié)間中點效應很低;按規(guī)范計算的簡支箱梁橋有效寬度與桁梁橋上有效寬度最大值相當,但與最小有效寬度差距甚大。
[Abstract]:Truss belt-type composite truss bridge has broad application prospect in practical engineering because of its good economy, stronger span ability and convenient building maintenance, and the joint of truss abdominal composite truss bridge is the key component of truss abdominal composite truss bridge. At present, the horizontal shear behavior of truss belt-type composite truss bridge is deeply understood. Considering the bending moment of web bar, the vertical deflection of deck slab and the mechanical behavior, plastic distribution and failure pattern of the joints, And the shear lag effect caused by discontinuous distribution of joints is not well understood. Through finite element simulation and experimental study, the mechanical behavior, plastic distribution and failure mode of the joints of truss composite truss bridges are deeply studied in this paper. The main contents of this paper are as follows: nonlinear finite element analysis of the joints of truss composite truss bridges with truss bellows. ABAQUS is used to establish the joints of truss composite truss bridges to consider the moment of web members. The model of the vertical deflection of the deck slab and its influence on the joints, then the nonlinear analysis is carried out, and the load-displacement curve is used. Three aspects of plastic distribution and failure mode of members are analyzed to analyze the performance of joints under complex boundary conditions. The simulation results show that the load-displacement curve of the joints is full and the yield point is not obvious. There is a great difference between the plastic distribution and failure mode of members and the horizontal shear test of joints. Experimental study and parameter analysis of joints of truss bellows composite truss bridges. Development of truss abdominal composite truss bridge joint specimens under complex boundary conditions. Repeated loading test, The load-displacement curve, skeleton curve, member stress and failure form of the loading end of the specimen are analyzed. The validity of the ABAQUS simulation is verified by the test data, and the parameter analysis of the node under the complex boundary condition is carried out. The experimental results show that, The load-displacement curve strengthening phenomenon, unloading stiffness degradation obviously; web eccentric force, stress concentration on the top; the cracks of the specimen concentrated on the concrete surrounded by the outside; the grade of the outer surrounding concrete, The diameter of perforated steel bar and the effect of perforated steel bar on yield strength are small. The influence of ultimate strength and ductility is great. The shear lag effect of simply supported truss abdominal composite truss bridge is studied. The ABAQUS finite element method is used to simulate the working condition of simply supported truss abdominal composite truss bridge under dead weight, and the node is taken as the observation object. The rules of longitudinal normal stress, shear lag coefficient and effective width of bridge deck are quantitatively analyzed in two dimensions of width and length. The simulation results show that both shear lag effect and negative shear lag effect exist on bridge deck slab, and the effect is the most serious at the joint. The effective width of the simply supported box girder bridge calculated according to the specifications is equivalent to the maximum effective width of the truss bridge, but the gap between the effective width and the minimum effective width is very large.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U441

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本文編號：1504760