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基于直接刚度法的弹性地基深梁单元 被引量:1
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作者 丁敏 李静 +1 位作者 罗双 曹琼琼 《铁道学报》 EI CAS CSCD 北大核心 2020年第5期136-142,共7页
为研究弹性地基深梁的受力及变形性能,根据双参数弹性地基模型和Timoshenko深梁模型的基本方程,建立了弹性地基深梁挠度控制方程,求得了挠度方程全解,并给出了弹性地基深梁梁轴转角、截面弯曲转角及剪切角的表达式;结合节点位移条件,得... 为研究弹性地基深梁的受力及变形性能,根据双参数弹性地基模型和Timoshenko深梁模型的基本方程,建立了弹性地基深梁挠度控制方程,求得了挠度方程全解,并给出了弹性地基深梁梁轴转角、截面弯曲转角及剪切角的表达式;结合节点位移条件,得到了位移系数;根据节点力方程建立了刚度平衡方程,给出了弹性地基深梁的刚度矩阵方程及均布荷载的等效节点力向量。在此基础上,分别计算了均布荷载、跨中集中力、两端集中力、两端集中力矩等荷载工况下的节点位移,求得弹性地基深梁挠度曲线,验证了本文给出的刚度矩阵方程及等效节点力向量的合理性及适用性。 展开更多
关键词 直接刚度法 弹性地基 深梁单元 刚度矩阵 等效节点力
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Comparison on construction of strut-and-tie models for reinforced concrete deep beams 被引量:2
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作者 仇一颗 刘霞 《Journal of Central South University》 SCIE EI CAS 2011年第5期1685-1692,共8页
With consideration of the differences between concrete and steel,three solutions using genetic evolutionary structural optimization algorithm were presented to automatically develop optimal strut-and-tie model for dee... With consideration of the differences between concrete and steel,three solutions using genetic evolutionary structural optimization algorithm were presented to automatically develop optimal strut-and-tie model for deep beams.In the finite element analysis of the first method,the concrete and steel rebar are modeled by a plane element and a bar element,respectively.In the second method,the concrete and steel are assigned to two different plane elements,whereas in the third method only one kind of plane element is used with no consideration of the differences of the two materials.A simply supported beam under two point loads was presented as an example to verify the validity of the three proposed methods.The results indicates that all the three methods can generate optimal strut-and-tie models and the third algorithm has powerful capability in searching more optimal results with less computational effort.The effectiveness of the proposed algorithm III has also been demonstrated by other two examples. 展开更多
关键词 reinforced concrete deep beam topology optimization strut-and-tie model genetic evolutionary structural optimization
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