论文部分内容阅读
对V-N微合金化钢筋和余热处理HRB400E钢筋的低周疲劳性能进行了研究。采用轴向应变控制的方法测定了两种工艺下钢筋的高应变低周疲劳性能,研究了在循环载荷下材料的循环应力响应特性、循环应力与应变关系,通过拟合Hollomon公式与Coffin-Manson公式推导出微合金化与余热处理两种钢筋的疲劳寿命计算公式,并计算出Nf=100周时的循环能量吸收率Δεt·σa值。结果表明,相比于轧后余热处理工艺,微合金化能同时提高Δεt和σa值,有利于材料在地震载荷下吸收较多能量,从而提高抗震性能。
The low cycle fatigue properties of V-N microalloyed rebar and heat treated HRB400E rebar were studied. The axial strain control method was used to measure the high strain and low cycle fatigue properties of the steel bar under the two processes. The cyclic stress response and cyclic stress of the material under cyclic loading were studied. The relationship between the cyclic strain and strain was obtained by fitting Hollomon equation with Coffin-Manson Formula to derive the fatigue life calculation formula of the two kinds of micro-alloyed and waste heat treatment, and calculate the cycle energy absorption rate Δεt · σa value when Nf = 100 weeks. The results show that compared with the post-rolling heat treatment, the micro-alloying can increase the Δεt and σa values at the same time, which helps the material absorb more energy under earthquake load and improve the seismic performance.