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首页> 外文期刊>Journal of Engineering Mechanics >Mechanical model for unbonded seven-wire tendon with symmetric wire breaks
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Mechanical model for unbonded seven-wire tendon with symmetric wire breaks

机译：具有对称断线的无粘结七线腱的力学模型

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A mechanical model for unbonded seven-wire tendons with broken wires that accounts for the effects of interwire friction and contact forces between the tendon and surrounding concrete is derived. The model is an essential tool for predicting the response, and reliability, of unbonded posttensioned concrete structures containing corroded tendons with broken wires. For the case where the broken wires are symmetrically arranged around the tendon cross section, the model predicts: (1) the strain variation with distance from the break in the broken and unbroken wires; (2) the affected length, where strains in the broken wires are less than those in the unbroken wires; and (3) the prestress force remaining after wire breaks occur. The affected length has practical significance because techniques used in practice to detect wire breaks will fail if performed outside the affected length. Experimental data obtained using a novel strongback beam confirm the response predicted by the model and indicate the coefficient of interwire friction is 0.164 for uncorroded tendons.
机译：推导了无粘结的七线断裂钢丝的力学模型，该模型考虑了线间摩擦和腱与周围混凝土之间的接触力的影响。该模型是预测未粘结的后张预应力混凝土结构（包含带有断裂钢丝的腐蚀钢筋束）的响应和可靠性的重要工具。对于断丝对称分布在肌腱横截面的情况，该模型预测：（1）应变随断丝和未断丝的断裂距离而变化; （2）受影响的长度，其中断丝的应变小于未断丝的应变; （3）断线后残留的预应力。受影响的长度具有实际意义，因为如果在受影响的长度之外执行，实际用于检测断线的技术将失败。使用新型强背梁获得的实验数据证实了该模型所预测的响应，并表明未腐蚀钢筋束的线间摩擦系数为0.164。

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