| 平面钢管桁架平面外稳定混合有限元分析 |
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| 引用本文： | 黄政华,张其林,季俊.平面钢管桁架平面外稳定混合有限元分析[J].土木与环境工程学报,2009,31(3):6-11. |
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| 作者姓名： | 黄政华 张其林 季俊 |
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| 作者单位： | 1. 同济大学,建筑工程系,上海,200092;贵州大学,土木建筑工程学院,贵阳,550003
2. 同济大学,建筑工程系,上海,200092 |
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| 基金项目： | 上海市科委世博科技专项项目 |
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| 摘 要： | 平面外失稳通常是无支撑平面钢管桁架在极限荷载作用下的破坏形式之一.在平面钢管桁架平面外稳定问题的求解方法中,采用梁一板壳混合有限元模型在完成整体稳定分析的同时,还可以得到节点区域实际的受力状况,且具有求解精度较高、单元数量较少的特点.根据混合有限元的基本原理,给出了混合单元交界上的结点约束方程.针对混合有限元求解方程的特点,为避免在求解上遇到数值困难,给出了混合单元模型在单元划分、求解方法上的原则和建议.数值算例与试验结果表明,混合有限元模型计算耗时较少,能较为准确的分析平面钢管桁架平面外失稳过程,提出的求解方法及建议较好的避免了数值困难的产生.
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| 关 键 词： | 有限元法 极限荷载 平面外稳定 平面管桁架 混合模型 约束方程 数值困难 |
| 收稿时间： | 2008/10/15 0:00:00 |
Analysis of Out-of-plane Stability for Planar Tubular Truss with Mixed Finite Elements Method |
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| HUANG Zheng hu,ZHANG Qi lin and JI Jun.Analysis of Out-of-plane Stability for Planar Tubular Truss with Mixed Finite Elements Method[J].Journal of Civil and Environmental Engineering,2009,31(3):6-11. |
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| Authors: | HUANG Zheng hu ZHANG Qi lin and JI Jun |
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| Affiliation: | 1.Department of Building Engineering;Tongji University;Shanghai 200092;P.R.China;2.School of Civil Engineering and Architecture;Guiyang 550003;P.R.China |
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| Abstract: | Out-of-plane instability is usually one of the failures for planar tubular truss without out-of-plane braces under ultimate load.The mixed model of beam and shell elements,with the characteristics of high solving precision and less elements,can undertake overall stability analysis as well as the joints mechanic property when solving the issue of out-of-plane stability.Based on the principle of mixed finite element,nodes constraint equations at the interface between beam elements and shell elements were deri... |
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| Keywords: | finite element method ultimate load out-of-plane stability planar tubular truss mixed model constraint equation numerical difficulty |
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