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目的探明圆形钢桥墩内填混凝土补强填充高度的计算方法及长细比和钢管径厚比参数对圆形截面钢桥墩承载力、延性等抗震性能的影响.方法在确定有限元分析与试验结果吻合的基础上,采用ABAQUS有限元软件对9组60个不同填充混凝土桥墩模型进行非线性数值模拟分析.结果与空钢管桥墩柱相比,部分填充混凝土圆形钢桥墩具有良好的抗震性能.随着混凝土填充率的增加,该类桥墩的延性和承载力均有所提高,超过最适填充率后,持续增加混凝土填充率,模型的承载力提高但延性下降.结论拟合出的混凝土填充率、承载力及延性与长细比和径厚比的关系公式为圆形钢桥墩内填混凝土补强填充高度的设计提供了依据.
Aim To study the calculation method of filling depth of concrete filled circular steel piers and the effect of slenderness ratio and diameter to thickness ratio on the seismic performance of circular section steel piers such as bearing capacity and ductility.Methods After the finite element analysis The nonlinear numerical simulation analysis of nine groups of 60 different filled concrete piers was carried out by using ABAQUS finite element software.Results Partially filled concrete circular steel piers had good seismic performance .The ductility and bearing capacity of the bridge piers increase with the increase of the filling rate of concrete.When the optimal filling rate is exceeded, the filling rate of concrete increases continuously, the bearing capacity of the model increases but the ductility decreases.Conclusion The fitted concrete The formulas of filling rate, bearing capacity, ductility, slenderness ratio and diameter to thickness ratio provide the basis for the design of filling height of circular steel piers filled with concrete.