钢筋混凝土阻力计算模型方法

Vladimir I. Kolchunov
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引用次数: 0

摘要

在综合分析试验研究结果与理论解趋同的基础上,提出了钢筋混凝土阻力计算模型。这些模型包括CMR1 -法向裂缝建模、CMR2 -倾斜裂缝建模、CMR3 -对角裂缝建模、CMR4 -墙体相交裂缝建模、CMR4* -平板裂缝建模、CMR5 -弯曲扭转空间裂缝建模、CMR5* -横向力弯曲空间裂缝建模。此外,还提出了二级和三级计算模型的层次结构。在拉格朗日函数偏导数等于零的条件下,通过建立块的封闭方程,以解析形式得到计算单元的工作钢筋强度沿截面的分布,以确定最大裂缝张开宽度。采用断裂力学双悬臂单元的特殊模型,考虑了作者提出的裂缝形成过程中混凝土不连续对“混凝土-钢筋”反应的附加变形影响的影响。对受弯曲扭转作用的复杂应力单元,提出了考虑裂纹变形梯度的截面线变形和角变形分布的假设。裂缝张开被定义为钢筋和混凝土的相互位移,并考虑了变形。采用初始参数法对建筑体系中子结构进行固结。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Method of computational models of resistance for reinforced concrete
Based on a comprehensive analysis of the experimental studies from the standpoint of their convergence with the theoretical solutions, the computational models of resistance (CMR) of reinforced concrete are proposed. These models include CMR1 - modeling of normal cracks, CMR2 - modeling of inclined cracks, CMR3 - modeling of diagonal cracks, CMR4 - modeling of intersecting cracks in the wall, CMR4* - modeling of cracks in a flat slab, and CMR5 - modeling of spatial cracks in torsion with bending, CMR5* - modeling of spatial cracks in bending with transverse force. Also, a hierarchy of computational models of the second and third levels is proposed. The distribution of intensity of working reinforcement along the cross-section of the calculated element was obtained in an analytical form by creating closed equations of blocks, corresponding to the blocks of the reinforced concrete element under the condition of equality to zero of partial derivatives of the Lagrange function to determine the maximum crack opening width. It is considered the effect proposed by the author on the additional deformation impact of the reaction “concrete - reinforcement” from the discontinuity of concrete during the formation of the crack by means of a special model of the two-cantilever element of fracture mechanics. Hypotheses about the distribution of linear and angular deformations during cross-section with account of gradients of deformations caused by formation of cracks were formulated for a complex-stressed element subjected to torsion with bending. Crack opening is defined as mutual displacements of reinforcement and concrete, taking into account deformation. The consolidation of substructures in the building system is performed by the method of initial parameters.
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