说明：  对于结构分析中的下降段，计算出荷载下降至最大荷载0.85倍时的位移值，然后计算该位移值与最大荷载对应位移值得比值，即延性系数。
(Therefore, the early-age cracking and splitting were avoided and the steel components could fully develop its strength, which resulted in a higher peak load and stiffness.)