建筑钢板抗震性能的影响因素研究

Influence Factors on Seismic Performance of Construction Steel Plate

以屈强比作为衡量建筑抗震性能的关键性指标,通过改变化学成分、终冷温度和弛豫时间的方法考察了建筑钢板抗震性能的影响因素。结果表明,不同微合金化钢板的屈强比从小至大依次为:Nb+Cr+Mo系<Nb+Cr系<Nb+Mo系<Nb系,主要是由于钢板中形成了纳米级的细小第二相粒子;当终冷温度分别为620℃、550℃和480℃时,钢板的屈强比分别为0.694、0.682和0.770,都小于建筑抗震钢板屈强比(小于等于0.8)的要求;在弛豫时间为25 s时取得屈强比的最小值0.76。

Taking yield strength ratio as a key indexes of the seismic performance in buildings, the method of changing chemical composition, final cooling temperature and relaxation time was used to study the factors affecting the seismic performance of construction steel plate. The results show that the order of the yield strength ratio of different microalloying steel from small to large is： Nb＋Cr＋Mo Nb＋Cr Nb＋Mo Nb system, mainly due to fine second phase particles in nanometer level form in the plate; when the final cooling temperature is 620, 550 and 480 ℃, the yield strength ratio of the steel is 0.694, 0.682 and 0.770, respectively, all less than the requirement of yield strength ratio of building earthquake resistant steel（≤ 0.8）; when the relaxation time is 25 s, the minimum value of the yield strength ratio is 0.76.