加载制度对新型型钢混凝土柱的抗震性能影响

发布时间：2019-02-19 15:57

【摘要】：采用有限元软件对新型型钢混凝土(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。
[Abstract]:The seismic behavior of a new type of steel reinforced concrete (SRC) column is simulated by finite element software, and the correctness of the model is verified by comparing with the experimental results. Through a large number of numerical simulations, the effects of loading path, cyclic times, amplitude increment of displacement and variable axial force on the seismic behavior of new type steel reinforced concrete columns are studied. Because of the biaxial coupling in the column, the seismic behavior of the column under the biaxial reciprocating load is obviously lower than that under the uniaxial reciprocating load, which indicates that the loading path has a significant effect on the seismic performance of the column. The number of cycles before yield load has little effect on the curve of column skeleton, and the influence after yield load is significant. The more the number of cycles is, the smaller the peak load and the corresponding displacement and displacement ductility are, but the greater the energy consumption is. The effect of displacement amplitude increment on seismic performance of columns under biaxial reciprocating load is more significant than that under uniaxial reciprocating load. The yield displacement yield load and displacement ductility coefficient increase with the increment of displacement amplitude but its energy consumption decreases. Under the action of variable axial force, the column shows obvious asymmetry, and its seismic performance is more disadvantageous than that under fixed axial force.
【作者单位】：西安建筑科技大学土木工程学院;
【基金】：国家自然科学基金项目(51178380,51108370)
【分类号】：TU398.9

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