基于纤维模型的RC结构的钢筋本构关系研究

发布时间：2018-10-20 09:14

【摘要】：以基于纤维模型的OpenSees软件为平台,首先,选用常用的钢筋本构(Steel01,Steel02)和混凝土本构(Mander,Hoshikuma),对PEER数据库中的两个钢筋混凝土柱的拟静力试验进行了数值建模与对比分析;再采用OpenSees软件中Reinforcing Steel钢筋本构模型,对钢筋单调拉压试验、循环加载试验、疲劳试验以及钢筋混凝土柱拟静力试验进行了模拟与对比分析.结果表明:现有的混凝土本构模型已相对成熟,并能较好地满足非线性数值模拟的精度要求,混凝土本构模型的改变对计算结果的影响不大,而钢筋本构模型的改变则会对分析结果产生较大的影响;Reinforcing Steel模型有效地提高了非线性模拟分析的精度,但也存在着对钢筋滞回曲线捏拢效应体现不足、分析结果偏于保守、计算过程较为复杂且较难收敛等缺点,尚需要对钢筋本构模型进行进一步的改进与完善.
[Abstract]:On the platform of OpenSees software based on fiber model, firstly, the pseudo-static tests of two reinforced concrete columns in PEER database are modeled and compared with each other, which are usually used in the steel bar constitutive model (Steel01,Steel02) and concrete constitutive model (Mander,Hoshikuma). Then the constitutive model of Reinforcing Steel reinforcement in OpenSees software is used to simulate and compare the monotone tensile compression test cyclic loading test fatigue test and pseudostatic test of reinforced concrete column. The results show that the existing concrete constitutive model is relatively mature and can meet the accuracy requirements of nonlinear numerical simulation. The change of concrete constitutive model has little effect on the calculation results. On the other hand, the change of the constitutive model of steel bar will have a great influence on the analysis results. The; Reinforcing Steel model can effectively improve the accuracy of nonlinear simulation analysis, but there is also a shortage of pinch effect on the hysteresis curve of steel bar, and the analysis results are conservative. The calculation process is complex and difficult to converge, so it is necessary to improve and perfect the constitutive model of steel bar.
【作者单位】：华中科技大学土木工程与力学学院;中铁第四勘察设计院集团有限公司;
【基金】：国家自然科学基金资助项目(51278218)~~
【分类号】：TU375

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