钢与混凝土组合梁受力性能分析-桥梁与隧道工程专业论文.docxVIP

硕上学位论文Abstract 硕上学位论文 Abstract The steel and concrete composite beams are flexural members which are made up of the steeI beams and the concrete slabs working together by shear connectors．The concrete slabs are the principaI pressure part and the steel beams are the primary tension pan under load．So the steel and concrete composite beams not only haVe the good mechanical behaviors and the serVice performance，but also haVe the good economic bene行ts，because of the fuU use of two material respectiVe mechanics characteristics．In this paper’theoretical analysis and conlputed research on this kind of structural mechanicaI behaViors including the nonlinear bearing capacity and creep ef．fect have been finished．Main contents and outcomes are listed as f．0llows： This paper describes design method and calculation theory of composite beams， and derives theoretical calculation fIormulas of temperature ef．f色ct， shfinkage and creep；The software ANSYS is adopted to establish the elastic—plastic finite element analysis mOdel for steel and concrete composite beams．In this model，the spring element is used f．or t0 simulae shear cOnnectors between steel beams and concrete slabs．With the use of ANSYS，the nonlinear analysis of steel and concrete composite Beams have been 6nished，the relationship between bearing capacity，distribution law of interface slip and material strength of composite beams and interVal of studs．In this paper，theoretical analysis and Shear Strength design method research of steel and concrete composite beams haVe been consummated；With the engineering backgrOund of Nanzhou bridge，creep calculation analysis of the composite beam is made，and the results by MDIAS shows as folIows：The ef佗ct of creep on steel and concrete composite beam manifested as that，it makes stress—redistribution of cross section，and steel beam，compressi Ve stress of which increases oVer time，wound undeIrtake more stress，meanwhile the concrete， stress of which decreases，is unloaded gradually． Pref-ab