摘要
目的研究混凝土旋转裂纹模型在有限单元法计算承载能力理论中的应用,提出计算开裂后混凝土承载能力的精确方法.方法将拉伸软化曲线以折线代替,采用由位移增量控制施加荷载的迭代方法.当位移增量的终点越过折线近似的拉伸软化曲线的转折点时,通过控制位移增量大小的方法,使位移增量的终点落在转折点上,下步迭代过程的新的刚度矩阵以新的折线的斜率为基础进行计算.结果采用高次等参单元求解混凝土破坏过程,其位移和应力可以得到较高精度.结论可以减少迭代步骤、提高混凝土开裂后承载能力的计算精度.对于不同工况,具有良好的适应性.
This paper proposes a more precise computing method for concrete load capability based on the application research of rotating crack model in the theory of computation. Poly - linear approximation can replace tension softening diagram and be taken into the computing process for concrete load capability. The iteration method with controlling displacement increment is adopted. The end -point of displacement increment must be set on the turning point by controlling the volume of displacement increment as the displacement increment get across the kink point, and the next displacement increment must be computed based on the new tension softening curvature. The calculation result shows that the stress and displacement is accurate using higher order elements. The conclusion is that the method proposed in this paper has good adaptability under different working conditions, and iterative procedure process can be significantly decreased by it, and also the computing result can be more precise than the existing finite element methods.
出处
《沈阳建筑大学学报（自然科学版）》
CAS
北大核心
2010年第4期704-708,共5页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家科技支撑计划项目(2006BAJ03A10)
关键词
旋转裂纹模型
拉伸软化曲线
迭代
位移增量
混凝土
Rotating Crack Model
tension softening diagram
iterative
volume of displacement increment
concrete
