HRB500级高强钢筋高温后的力学性能试验

Experimental Research on Mechanics Performance of HRB500 Grade Steel Bars after High Temperature

对HRB500高强钢筋在高温后的力学性能进行试验,研究不同受火温度对其力学性能的影响,以及高温后的应力-应变关系曲线图的变化规律,并提出相应的力学模型.结果表明,经历高温作用并冷却后,高强钢筋的屈服强度、极限强度、弹性模量、延伸率和截面收缩率等力学性能随所经历的温度的不同而变化,变化规律也不相同.钢筋的应力-应变关系发生一定的变化,但是一般仍然出现明显的屈服阶段和强化阶段,屈服台阶的高度随着温度的升高而降低;高强钢筋的弹性模量的变化很小.

Based on the mechanical properties tests of HRB500 grade steel bars, the influence of different high temperatures and the variation of stress-strain curves after high temperature are investigated. The mechanical model is obtained. The results of experiments indicate that： mechanical properties of bars cooled down after different high temperatures, such as the yield strength, ultimate strength, elastic modulus and elongation percentage, vary with different high temperatures, and the variation for various properties are also different. Though the stress-strain curves of the bar changes, the yield phase and hardening phase are still notable. The yield strength drops with increasing the temperature, but the variation of the elastic modulus is small.