As we all know, after enduring certain pressure, everything will undergo some quantitative or qualitative changes, the same is true for reinforcing bars. Because of its own limitations, ordinary steel bars can not well withstand greater pressure, so there is the existence of anti-seismic steel bars. Today, I will simply tell you what the requirements of anti-seismic steel bars are.

　　抗震钢筋要求之概念：质检总局和标准化委员会共同发布的GB1499.2–2007《钢筋混凝土用钢第2部份：热轧带肋钢筋》。标准中明确规定，抗震钢筋的符号为在较高要求的抗震结构牌号后加“E”，例如HRB400E，HRB500E。“E”，是英语单词Earthquake(地震)的个字母，标志着钢筋产品达到了颁布的“抗震”标准。

　　Concepts of Requirements for Seismic Reinforcement: GB1499.2-2007 "Steel for Reinforced Concrete Part 2: Hot Rolled Ribbed Reinforcement Bars" issued jointly by the General Administration of Quality Supervision and Inspection and the National Standardization Committee. It is clearly stipulated in the standard that the symbol of aseismic reinforcement is "E" after the higher demanding aseismic structural grade, such as HRB400E and HRB500E. "E" is the first letter of the English word Earthquake, which indicates that the steel products have reached the "seismic" standard promulgated by the state.

　　抗震钢筋要求除应满足标准所规定普通钢筋所有性能指标外，还应满足以下：

　　In addition to meeting all the performance indexes of ordinary steel bars specified in the standard, the requirements of aseismic steel bars should also meet the following requirements:

　　1.抗震钢筋的实测抗拉强度与实测屈服强度特征值之比不小于1.25；

　　1. The ratio of the measured tensile strength to the measured yield strength is not less than 1.25.

　　2.钢筋的实测屈服强度与标准规定的屈服强度特征值之比不大于1.30；

　　2. The ratio of the measured yield strength to the characteristic value of the yield strength specified in the standard is not more than 1.30.

　　3.钢筋的大力总伸长不小于9%。

　　3. The maximum total elongation of steel bar is not less than 9%.

　　以上三条确保了钢筋的抗震能力，使得抗震钢筋能够在建筑发生倾斜、变形时“稳起”，不发生断裂。

　　The above three elements ensure the anti-seismic ability of the steel bars, so that the anti-seismic steel bars can be "stabilized" when the buildings are inclined and deformed, and do not break.

　　不过从新标准对抗震钢筋的三条规定要求来看，主要针对钢筋强度和伸长率的实测值在技术指标上作了一定的提升，如条对抗震钢筋规定从屈服到拉断还应承受25%以上的拉力；第二条保证钢筋屈服强度离散性不会过大而影响到设计对结构延性要求的效果；第三条由对普通钢筋规定的大力总伸长率不小于7.5%提高到不小于9%。这些技术指标的提高，加强了钢筋的抗震能力，保证了结构构件在地震力作用下具有更好的延性。

　　However, according to the three requirements of the new standard for seismic steel bars, the measured values of strength and elongation of steel bars have been improved to some extent in technical indicators, such as the first stipulation that seismic steel bars should bear more than 25% tension from yielding to breaking; the second one guarantees that the discreteness of yield strength of steel bars will not be too large to affect the effect of ductility requirement in design; and the third one guarantees that the discreteness of yield strength of steel bars will not be too large 条由对普通钢筋规定的大力总伸长率不小于7.5%提高到不小于9%。 The improvement of these technical indicators strengthens the seismic capacity of steel bars and ensures that structural members have better ductility under seismic force.

　　因此，抗震钢筋和普通钢筋的本质区别就是使钢筋获得更好的延性，从而能够更好地保证重要结构构件在地震时具有足够的塑性变形能力和耗能能力。

　　Therefore, the essential difference between aseismic steel bar and ordinary steel bar is to make the steel bar have better ductility, which can better ensure that the important structural components have sufficient plastic deformation capacity and energy dissipation capacity in earthquake.