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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。
The analysis model of reinforced concrete and prestressed concrete subjected to combined loads is presented. The loads include axial force, two-way bending moment, torque and two-way shear force. The proposed model is based on the simple dynamic assumption of the Timoshenko beam theory and preserves the shape of the three-dimensional frame with any cross-sectional dimension. The control section of the frame is subdivided into 1D, 2D and 3D material responses. The material model constructed of reinforced concrete and prestressed concrete follows the basic assumptions of the improved compression field theory expressed by the tangent stiffness formula. The correctness of the model is verified by comparing the results with several well-known experiments in the literature. These simulations include a series of varying load combinations of bending, shear and torque. The analysis results show that the ultimate strength of the specimen and the local strain response from the initial crack to the final load are in good agreement with the experimental results.