给出深梁开裂时剩余刚度范围，以便在试验和实际工程中估计开裂的发生。
Through a large number of computation, the range in cracking residual rigidity of deep beams are given for convenience to estimate the cracking in experiment and engineering practice.
提出基于参数识别方法的损伤结构层间刚度及剩余强度计算方法；
The calculation methods about damage story stiffness and the residue story strength of damage structure are presented by the method of parameter identification.
根据疲劳试验结果，建立了预应力钢纤维混凝土板弯曲疲劳方程和剩余强度衰减方程，分析了抗弯刚度衰减规律。
According to fatigue experiment results, the fatigue equation and equation of surplus strength degradation are built. The law of degradation of flexural rigidity is analyzed.
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