部分充填式窄幅钢箱-混凝土连续组合梁有限元分析

Finite element analysis of partially concrete-filled narrow-width steel box continuous composite beam

以3根在负弯矩区不同配筋率的2×3 m部分充填式窄幅钢箱-混凝土连续组合梁的试验研究为基础,采用有限元软件ABAQUS建立了部分充填式窄幅钢箱-混凝土连续组合梁的非线性有限元模型,模拟了构件在两点对称集中荷载作用下连续组合梁负弯矩区的受力性能,计算结果和试验结果吻合良好,验证了模型的有效性.对混凝土强度、钢箱梁顶板、腹板以及底板的厚度等影响连续组合梁的主要参数进行分析,分析结果表明:通过增加钢箱梁腹板和底板的钢板厚度,能有效提高部分充填式窄幅钢箱-混凝土连续组合梁的极限承载力和刚度。

Based on the experimental study of three 2×3 m partially concrete-filled narrow-width steel box continuous composite beams with different reinforcement ratios in the negative moment area,the nonlinear finite element model of a partially concrete-filled narrow-width steel box continuous composite beam was built by using finite element software ABAQUS.It simulated the mechanical properties of the negative bending moment zone of the continuous composite beam under the condition of two-point symmetric concentrate loading.The calculated results consistent with the experimental results,which verifies the effectiveness of the model.The main parameters affecting the continuous composite beam are analyzed,including concrete strength,steel box girder roof,web and floor thickness.The analysis results show that by increasing the thickness of the steel plate girder web and the bottom plate,the ultimate bearing capacity of the partially concrete-filled narrow-width steel box composite beams can be effectively improved and stiffness.