基于OpenSees的空间桁架后屈曲材料本构模型

发布时间：2018-06-13 03:18

本文选题：空间桁架 + 弹性后屈曲　；参考：《郑州大学学报(理学版)》2016年01期

【摘要】：空间桁架结构在轴向压力作用下容易发生失稳,采用合理的钢材本构关系进行分析是准确追踪桁架屈曲后行为的有效方法.借助Open Sees软件平台,基于桁架非弹性后屈曲单轴材料本构模型,根据滞回准则,提出了该本构模型新的实现方式;将模型分解为受拉屈服前卸载、受拉屈服后卸载、受压屈服前卸载和受压屈服后卸载4种加卸载路径,基于材料基类编制了空间桁架弹性后屈曲、非弹性后屈曲本构模型,通过算例验证了这些本构模型的正确性,并为如何采用这些模型进行空间桁架结构分析提出了建议.
[Abstract]:Space truss structures are prone to instability under axial pressure. It is an effective method to accurately track the post-buckling behavior of truss structures by means of reasonable steel constitutive relations. Based on the unelastic post-buckling uniaxial material constitutive model of truss and hysteretic criterion, a new implementation method of the constitutive model is proposed, which is decomposed into unloading before tensile yield and unloading after tensile yield. There are four loading and unloading paths before and after compression yield. Based on the material class, the post-buckling and inelastic post-buckling constitutive models of space truss are developed. The correctness of these models is verified by an example. Suggestions on how to use these models to analyze space truss structures are also given.
【作者单位】：郑州大学土木工程学院;
【基金】：河南省科技攻关计划项目(142102310345)
【分类号】：O344.1

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