某单跨下承式钢管混凝土系杆拱桥节点的受力性能分析研究
毕业论文关键词 钢管混凝土 下承式拱桥 节点 数值分析
Title A Single Span CFST Tied Arch Bridgenode force performance analysisAbstract Abstract Abstract AbstractUnder CFST Tied Arch Bridge, the tie bar and the rib, tie beam and rib,the tie bar and tie beam connection node is a key component of the wholestructure, and each part of the connection form force performance are verycomplicated, analysis and research the mechanical properties of the nodeand its influencing factors, to improve the overall performance of thebridge is important, and can provide similar bridges provide the basis forthe structural design.N umerical analysis method was used i n this paper, first create d full-bridgespace finite element model for the static calculation and analysis; By thestress analysis results, select de the foot arch, c onnected node of tiebar , tie beams and beams, connected node of tie bar and rib as the objectto detailed analyze . A ccording to the interception principles of thedetailed model to determine the interception size of each component in thelocal model; analyzed and identified boundary conditions of the local modelto be applied; which established finite element analysis local model ofthe node for force calculation and analysis.The analysis results showed that: the arch node exist de stressconcentration, the location at the junction s of tie beam connect ed withthe beam and arch connect ed with tie beam , the maximum stress was 220Mpa,close to the yield strength 345Mpa of the material, safety reserve was low.P roposed modifications opinion f or this phenomenon was : t hicken the tiebeam ’ s web thickness from 14mm to 24mm, t hicken the tie beam ’ s flange plate thickness from 20mm to 30mm, u nchanged the other component ’ s size ,calculated stress values of each component in the modified model is small erthan stress values in the unmodified model, and reduced stressconcentration, the maximum stress was reduced to 170Mpa, the reduc edamplitude is 23%. Stress of the selected connected nodes of tie bar, tiebeams and beams, distributed uniform, s maller change d, the maximumequivalent stress did not exceed 76Mpa, which occurred in the junction ofthe tie beam ’ s flange and the beam ’ s flange.The joints of the tie bar andthe rib occur ed stress concentration, the maximum stress wa s 96Mpa .This paper r esearch ed the force of the node in Under CFST arch bridge , whichcan provide reference for the design of similar bridges, and also haspractical value.
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