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- 2017
基于OpenSees的巨型SRC柱低周反复试验数值分析
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Abstract:
为研究巨型SRC柱抗震性能的数值模拟方法，本文基于有限元分析软件OpenSees，采用纤维单元模拟5根具有不同复杂截面型钢形式的巨型SRC柱试件的低周反复加载试验，并与试验滞回曲线以及骨架曲线进行对比分析。结果表明，该基于纤维单元的有限元模型能够较好模拟巨型SRC柱试件的滞回反应，具有一定的合理性和可靠性。同时采用一种新型高性能分层壳单元对其中一根巨型SRC柱试件进行精细有限元建模分析，分析结果与试验结果对比表明分层壳能够较好地模拟试件的初始刚度和峰值承载力；与纤维单元模拟结果对比表明纤维单元能够更好地模拟试件承载力的下降，结果更加精确，且计算效率更高；新型高性能壳单元DKGQ能够弥补原有壳单元的不足，更好地模拟构件因混凝土大量开裂剥落导致的承载力下降。
A steel reinforced concrete (SRC) column is a combined specimen constructed by allocating steel in the reinforced concrete in order to bear the external force. Because the SRC column gains the advantages of high strength and stiffness, good ductility, and fine refractoriness, it is widely used in high-rise structures nowadays. From the mixture of steel and reinforced concrete, the force performance and failure mode of the SRC column become more complex than ordinary columns. In this paper, in order to study the numerical simulation methods of the seismic performance of mega SRC columns, based on the finite element software OpenSees, tests on five mega SRC column specimens with different and complex steel sections were carried out under low cyclic reversed load by using the fiber element. Then, the numerical simulation results were compared to hysteretic and skeleton curves. The results indicate that the finite element model based on the fiber element can efficiently simulate the hysteresis response of mega SRC columns, which verifies the rationality and reliability of the numerical model. Meanwhile, a new high-performance multi-layer shell element was used in order to accurately analyze one of the mega SRC column specimens. By comparison to experimental results, the multi-layer shell can adequately simulate the initial stiffness and peak bearing capacity of the specimen. By comparison to the simulation results of the fiber element model, it was found that using fiber element could better simulate the descent of the specimen's bearing capacity, and the results were rather more accurate and efficient.
