承受轴向、弯曲、剪切和扭曲组合荷载的钢筋混凝土和预应力混凝土的三维数值模型

A 3D Numerical Model for Reinforced and Prestressed Concrete Elements Subjected to Combined Axial, Bending, Shear and Torsion Loading

提出了钢筋混凝土和预应力混凝土承受组合荷载下的分析模型,荷载包括轴力、双向弯矩、扭矩和双向剪力。所提出的模型基于Timoshenko梁理论的简单动力假设,保持了任意截面尺寸情况下的三维框架的形状。框架的控制截面被细分为一维,二维和三维材料响应。钢筋混凝土和预应力混凝土构建的材料模型遵循用切线刚度公式表示的改进压缩场理论的基本假设。通过其结果与文献中几个著名的试验相比较验证了模型的正确性。这些模拟包括弯曲、剪力和扭矩一系列变化的荷载组合。分析结果显示,试件的极限强度以及从初始裂缝到最终荷载的局部应变响应与试验结果十分吻合。

This paper presents a model for the analysis of reinforced and prestressed concrete frame elements under combined loading conditions, including axial force, biaxial bending, torsion and biaxial shear force. The proposed model is based on the simple kinematic assumptions of the Timoshenko beam theory and holds for curved three dimensional frame elements with arbitrary cross-section geometry. The control sections of the frame element are subdivided into regions with 1D, 2D and 3D material response.