High-strength Steel-concrete Composite Beams Static Performance Research

Steel-concrete composite beams were favored due to they can give full play totheir constituent material the advantages, and had been successfully applied in manydomestic and foreign construction projects and bridge projects. Currently research onordinary steel-concrete composite beams had made great strides, but research on highstrength steel-concrete composite beams had just started, so this paper would studythe basic static performance of high strength steel-concrete composite beams:flexuralcapacity, the midspan section distribution stress and strain, deflection, interface slip.Because composite beams used I-section beams, so we studied the static performanceof high strength I-section steel beams first,then studied the static performance of highstrength I-section steel-concrete composite beams.This article described the destruction form of high strength I-section beams:elastic torsional buckling,plastic flexural torsional buckling,local buckling andstrength failure,use elastic torsional buckling formula validated correctness ofI-section steel beams finite element model; introduces two composite beam theory:elasticity theory and plasticity theory, used elasticity theory calculated deflection ofcomposite beams in considering the interface slip to validate correctness of highstrength I-section steel-concrete composite beams finite element model.Analysisd the impact of initial geometric defect δ0(midspan maximum lateraldeformation) on stability capacity and flexural capacity of high strength I-section steelbeam; studied and analyzed the law of static performance (stability, flexural capacityand deformation) with different strength of steel beams; study the static performanceof hybrid girder, obtained on I-section steel beams mixing design was stilleconomically viable.Studied and summarized static properties of the high strength steel-concretecomposite beams (ultimate load, deflection, the interface slip); analyzed the impact ofthe law with different degree of shear connection coefficient on high strength steel-concrete composite beams span section stress and strain, deflection, the interfaceslippage, got high strength steel-concrete composite beams more economicallyreasonable degree of shear connection coefficient is about0.85; studied high strengthsteel-concrete composite beams static performance of steel girder flange thickness,web height, flange thickness and other parameters of concrete, summed up on the composite beam design and application with a certain reference significanceconclusions.