预制装配式钢骨混凝土组合柱基节点抗震性能研究

RESEARCH ON ASEISMIC PERFORMANCES OF BASE JOINTS FOR PREFABRICATED COMPOSITE STEEL-CONCRETE COLUMNS

为研究预制装配式钢骨混凝土组合柱基节点的抗震性能,对3根不同剪跨比的新型柱基节点试件进行拟静力试验。利用有限元软件ABAQUS对试验件进行数值模拟,验证有限元模型的合理性。在此基础上,以剪跨比和连接模块内部的钢管截面形状为参数变量,分析不同剪跨比和钢管截面形状对组合柱基节点抗震性能的影响规律。结果表明:随着剪跨比的增大,连接模块内部钢管形状为方钢管的试件(PJ试件)和连接模块内部钢管形状为圆钢管的试件(YG试件)极限承载力和耗能能力均逐渐降低,PJ试件和YG试件极限承载力平均下降幅度分别为14.59%和21.87%,耗能平均降低幅度分别为27.75%和36.71%。随着剪跨比的增大,PJ试件的延性性能逐渐减弱并趋于稳定,而YJ试件的延性性能逐渐减弱。YG试件的屈服承载力、峰值承载力以及极限承载力均低于PJ试件,但耗能能力和延性能力有很大提高。

To study the seismic performance of base joints for prefabricated composite steel-concrete columns,three new specimens with different ratios of shear span to effective length were conducted by quasi-static tests.The finite-element software ABAQUS was also used to simulate the specimens.The rationality of the numerical model was verified by comparing the results between the simulations and tests.The ratios of shear span to effective length and cross-section shapes of steel tubes inside the connection module were taken as variables,the influences of different rations of shear span to effective length and cross-section shapes of steel tubes on the aseismic performances of the composite column foundation were analyzed.It was indicated that when the ratios of shear span to effective length increased,the ultimate bearing capasity and energy dissipation capacity of the test tubes with steel tubes specimens PJ and YC inside the connection module were gradually reduced.The ultimate bearing capacity of PJ and YG reduced by 14.59%and 21.87%evenly.Correspondingly,the energy consumption reduced by 27.75%and 36.71%evenly.With the increase of the ratios of shear-span to effective lenghth,the ductility of PJ gradually weakened and stable gradually,while the YJ gradually weakened.The yield bearing capacity,peak bearing capacity and ultimate bearing capacity of the YG all were lower than that of the PJ,but the energy dissipation capacity and ductility had been significantly improved.