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预测结构在罕遇地震作用下的非线性行为是结构基于抗震性能设计和评估中的关键问题,而其首要问题在于解决结构构件的非线性分析模型问题。本文介绍了结构非线性分析中三种常用的宏观单元模型,即基于刚度法的梁柱单元(DB)、基于柔度法的梁柱单元(FB)以及基于柔度法的塑性铰单元(PH)模型。基于PEER柱子试验数据库,将三种单元数值模拟结果与相应的试验结果进行对比,并以峰值强度之比、初始刚度之比和能量耗散能力之比三个指标统计评估了三种单元数值模拟的精确性。研究结果表明,PH单元计算结果的初始刚度之比和能量耗散能力之比均好于DB和FB单元,三种单元计算结果的峰值强度之比较接近,PH单元模拟精度最好。
The nonlinear behavior of the prediction structure under the action of a rare earthquake is a key issue in the design and evaluation of the structure based on seismic performance, and its primary problem lies in solving the nonlinear analysis model problem of structural components. This paper introduces three common macro-element models for structural nonlinear analysis, namely the beam-column unit (DB) based on the stiffness method, the beam-column unit (FB) based on the flexibility method, and the plastic hinge unit based on the flexibility method (PH )model. Based on the PEER column test database, the numerical simulation results of the three units were compared with the corresponding test results. Three kinds of numerical simulations were performed on the basis of the three indicators: the ratio of the peak intensity, the ratio of the initial stiffness and the energy dissipation capacity. The accuracy. The results show that the ratio of the initial stiffness and the energy dissipation capacity of the PH unit is better than that of the DB and FB units. The peak strengths of the three units are close to each other, and the PH unit has the best simulation accuracy.