The seismically isolated simply-supported beam bridge (SISBB) with the seismic isolation bearing (SIB) is converted into an equivalent bilinear single-degree-of-freedom system. Then, by inputting the 139 near-fault ground motion (GM) records into the equivalent system, the parametric study on the near-fault seismic input energy spectra (S_EI) of the SISBB is conducted by considering the equivalent system parameters and the near-fault GM characteristics. So, it can be found that: the increase of post-yield stiffness ratio (η_e) can slightly increase the peak values of the near-fault S_EI, and η_e = 0.2 can be used to calculate the near-fault S_EI design spectra of the SISBB; with the increase of the damping ratio (ξ_e) (or ductility ratio (μ_e)), the spectral values of the near-fault S_EI increases, the hysteretic energy dissipation capacity of the SIB decreases, and the damping energy dissipation capacity of the equivalent system increases; when μ_e ≥ 10, the effect of μ_e on the near-fault S_EI can be ignored; the softer the site soil or the smaller the Joyner-Boore distance to rupture plane (R_jb) is, the greater the near-fault S_EI is; if the near-fault S_EI with a standard peak ground acceleration (PGA) is known, the near-fault S_EI with other PGAs can be obtained by multiplying the (PGA_Other/PGA_Standard)² by the spectral values of the near-fault S_EI with a standard PGA. Finally, the near-fault S_EI design spectra of the SISBB are obtained, and the seismic isolation design for SISBB based on the energy balance method is proposed, the feasibility of which is verified by a case study.

带有隔震支座（SIB）的隔震简支梁桥（SISBB）被转换为等效的双线性单自由度系统。然后，通过将139个近断层地震动记录输入等效系统，通过考虑等效系统参数和近邻来对SISBB的近断层地震输入能谱（S _EI）进行参数研究。 -故障通用特征。这样，可以发现：的后屈服刚度比（增加η _ë）可以稍微增加的峰值近断层小号_EI，和η _Ë  = 0.2可以用于计算近断层小号_EISISBB的设计范围；与阻尼比的增加（ξ _ë）（或延展性比（μ _ë）），的近断层频谱值小号_EI增大，SIB的滞后能量耗散能力下降，和的阻尼能量耗散能力等效系统增加；当μ _ë  ≥10的效果μ _Ë对近故障小号_EI可以忽略; 现场土壤越软或距破裂面的Joyner-Boore距离（R _jb）越小，则近断层S _EI越大；如果接近故障S_EI与标准峰值地面加速度（PGA）是已知的，近断层小号_EI与可由（PGA相乘来获得其它的PGA_其他/ PGA_标准） ²通过的频谱值近断层小号_EI用标准PGA。最后，近断层小号_EI获得了SISBB的设计光谱，并提出了一种基于能量平衡方法SISBB地震隔离设计，其中的可行性通过一个案例研究证实。