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Non-linear finite element analysis of reinforced concrete beams with temperature differentials

机译:带温差的钢筋混凝土梁非线性有限元分析

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Nonlinear finite element modelling is initially conducted to simulate simply supported reinforced concrete beams with temperature differentials over their depth (Delta T= 30 degrees C) that were tested at room (15 degrees C) and low temperature (-25 degrees C) during the experimental phase of this research program. Three-dimensional finite element models of the beams are developed to account for the geometry, material, loading, boundary conditions, and temperature profile. Then, the results of the nonlinear finite element analysis (NLFEA) are verified against the corresponding experimental results in terms of cracking loads, yield loads, ultimate loads, displacements, and cracking patterns. The validated NLFEA models are then extended to explore the response of the same beams with uniform temperature profiles as well as similar statically indeterminate reinforced concrete beams with and without temperature differentials. The numerical results show that the models are capable of predicting the ultimate strength of the beams at both room and low temperature. Additionally, the results show that indeterminacy (fixed-ends) substantially increases the ultimate strength of the reinforced concrete beams (up to 110%). The NLFEA results also show that low temperature (down to -40 degrees C) increases the strength of the beams without stirrups and decreases the number of the cracks on those beams even when temperature differentials are present. On the other hand, the strength and cracking pattern of the beams with stirrups are not affected when exposed to temperatures as low as -40 degrees C. (C) 2017 Elsevier Ltd. All rights reserved.
机译:首先进行非线性有限元建模,以模拟简单支撑的钢筋混凝土梁,该梁在其整个深度(Delta T = 30摄氏度)上存在温差,并在实验过程中在室温(15摄氏度)和低温(-25摄氏度)下进行了测试此研究计划的阶段。开发了梁的三维有限元模型,以说明几何形状,材料,载荷,边界条件和温度曲线。然后,针对裂纹载荷,屈服载荷,极限载荷,位移和裂纹模式,将非线性有限元分析(NLFEA)的结果与相应的实验结果进行了验证。然后将经过验证的NLFEA模型进行扩展,以探索具有均匀温度曲线的相同梁以及具有和不具有温度差的相似的超静定钢筋混凝土梁的响应。数值结果表明,该模型能够预测室温和低温下梁的极限强度。此外,结果表明,不确定性(固定端)显着提高了钢筋混凝土梁的极限强度(高达110%)。 NLFEA结果还表明,即使存在温度差,低温(低至-40摄氏度)也会提高无箍筋的梁的强度,并减少这些梁上的裂纹数量。另一方面,当暴露于低至-40摄氏度的温度下时,带有箍筋的梁的强度和开裂样式不会受到影响。(C)2017 Elsevier Ltd.保留所有权利。

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