Analysis On The Nonlinear Mechanical Performance Of Steel-concrete Continuous Compostie Beam

In recent years, steel-concrete continuous composite beams are widely used inhigh-level or large-span space structures. Steel-concrete continuous composite beam hasa great advantage in engineering because its high ultimate bearing capacity and smalldeformation comparing to simply supported composite beams. While, nonlinearmaterial properties, the interface slip, concrete crack in hogging moment and shrinkageand creep of concrete all contribute to the nonlinear mechanical property of continuouscomposite beam. In this paper, the nonlinear mechanical property of continuouscomposite beams will be studied based on the single-span continuous composite beams.The finite element software ABAQUS was used in this paper to study the staticperformance and seismic performance of composite beams. The finite element modelscontain three different materials: concrete, stud and steel. The SPRING2element wasused to simulate the shear effect of interface. And in order to make sure the reliability ofthe simulation, experiment in the literature was chosen to check the reliability.The effect of stud arrangement on the static performance of composite beams wasstudied mainly.2groups of6different stud arrangement schemes were used in eachparametric study. According to the analysis results, the smaller deformation and bettermechanical properties of materials can be achieved by using smaller diameter of studand larger degree of shear connection. Well, conversely, the concrete crack in thehogging moment will be better controlled. Based on the conclusion aboved, the studarrangements of continuous composite beams in the sagging and hogging momentswere suggested to be considered respectively.Under the low cyclic vertical dynamic load，the seismic performance of compositebeams were studied next. Under low cyclic load, the badly damage of concrete lessenthe contribution of concrete to the energy dissipation capacity of composite beam. Forengineering consideration, the energy dissipation capacity of I-section steel beam whichbelongs to the composite beam can be regard as the conservative capacity of compositebeam.The engineering design software Midas/Gen was chosen to study the long termperformance of continuous composite beams. The calculation results of software put outthat the deformation and slip were decreased as the shrinkage and creep of concrete, thesame to the stress transformation from the concrete flange plate to the I-section steelbeam.