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加载制度对新型型钢混凝土柱的抗震性能影响

ISSN号：1000-4750
期刊名称：工程力学
时间：0
页码：-
分类：TU398.9[建筑科学—结构工程]
作者机构：[1]西安建筑科技大学土木工程学院,西安710055
相关基金：国家自然科学基金项目（51178380,51108370）
相关项目：高强箍筋高强混凝土结构受力机理及其设计理论研究

关键词：新型型钢混凝土柱, 加载制度, 数值模拟, 双轴耦合作用, 抗震性能, new-type steel reinforced concrete columns, loading regimes, numerical simulation, biaxialcoupling effect, seismic behavior

中文摘要：

采用有限元软件对新型型钢混凝i（SRC）柱抗震性能进行了数值模拟，通过与试验结果的对比，验证了模型的正确性。通过大量的数值模拟，研究了加载路径、循环次数、位移幅值增量及变轴力对新型型钢混凝土柱抗震性能的影响。由于柱内存在双轴耦合作用，双轴往复荷载作用下较单轴往复荷载作用下柱的抗震性能明显降低，表明加载路径对柱的抗震性能影响显著；屈服荷载前循环次数对柱骨架曲线的影响很小，屈服荷载后影响显著，循环次数越多其峰值荷载及其对应的位移和位移延性越小，但其耗能越大；双轴往复荷载作用下位移幅值增量对柱抗震性能的影响较单轴往复荷载作用下的显著，屈服位移、屈服荷载、位移延性系数随位移幅值增量的增大而增大，但其耗能减小；在变轴力作用下柱表现出明显的不对称性，且其抗震性能明显较定轴力作用下更为不利。

英文摘要：

The aseismic behavior of new type steel reinforced concrete （SRC） columns was simulated based on the finite element software, and the calculated results were compared with experimental results to ensure the correcteness of the simulation model. Furthermore, with abundant simulations, the effect of loading paths, the cycle times of displacemensts, the amplitude increment of displacements and variable axial forces were studied on aseismic behavior of the new type SRC columns. Because a biaxial coupling effect exists in the column, the aseismic behavior of the columns under a biaxial cyclic loading path is much lower than those under a uniaxial cyclic loading path, which indicates that the aseismic behavior of the column is influenced significantly by the loading path. Before reaching the yield load, the skeleton curves are not significantly influenced by the cycle times of displacements, but significantly influenced after the yield load. The more cycle times of displacements the smaller the peak load as well as the corresponding horizontal displacement and the displacement ductility ratio are reached, but its energy dissipation is larger. The effect of the increment of displacements on aseismic behavior of the columns under a biaxial cyclic loading path is much more significant than those under a uniaxial cyclic loading path. The yield displacement, yield load, and displacement ductility ratio are increased with the increase of the increment of displacements, but the energy consumption is decreased. The column under a variable axial force shows asymmetry apparently, and it is more adverse than the one under a constant axial force in the aseismic behavior.

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