室温拉伸试验速率对钢筋力学性能测试的影响分析
Analysis of the Influence of Room Temperature Tensile Test Rate on the Mechanical Properties of Steel Bars

为分析不同拉伸速率对钢筋力学性能测试结果的影响，采用4种不同速率控制条件下的钢筋室温拉伸试验，对比下屈服强度、抗拉强度、最大力总延伸率的变化规律。结果表明：下屈服强度受拉伸试验速率的影响最大，抗拉强度次之，最大力总延伸率最小。Φ22、Φ25钢筋样品选择0.002 s^？1应变控制速率时，结果较标准推荐速率结果分别增加6.47%、3.02%，影响程度超过试验系统误差的允许范围，建议采用0.00025 s_？1应变控制速率；抗拉强度试验当受测试设备限制按0.0067 s^？1应变速率控制时，可优先选择0.002 s^？1应变速率控制，能够有效控制试验持续时间和结果偏差波动；最大力总延伸率对拉伸试验速率的影响敏感性较低，不同速率选择不会对结果产生明显影响。实验结果可为钢筋拉伸试验力学性能测试的准确性和可靠性提供参考。
In order to analyze the influence of different tensile rates on the test results of mechanical properties of steel bars, the room tempera-ture tensile tests of steel bars under four different rate control conditions were used to compare the change laws of lower yield strength, tensile strength and total elongation of maximum force. The results show that the lower yield strength is most affected by the tensile test rate, followed by the tensile strength, and the total elongation of the maximum force is the smallest. When 0.002 s^？1 strain control rate is selected for the Φ22, Φ25 reinforcement sample, the results are 6.47% and 3.02% higher than the standard recommended rate, respectively, and the influence degree exceeds the allowable range of test system error, so 0.00025 s^？1 strain control rate is recommended; when the tensile strength test is controlled by 0.0067 s^？1 strain rate due to the limitation of test equip-ment, 0.002 s^？1 strain rate control can be preferred, which can effectively control the test duration and result deviation fluctuation; the sensitivity of the total elongation of the maximum force to the impact of the tensile test rate is low, and the selection of different rates will not have a significant impact on the results. The experimental results can provide a reference for the accuracy and relia-bility of the tensile test of steel bars.