*3.3. Combination of SBCs and FPBs*

The combined scheme of SBCs and FPBs was adopted to improve the seismic performance of the arch bridge. In this scheme, FPBs are only set on column 1# and column 10#. The bearing layout is shown in Table 5, and the reader is referred to Section 3.2 for details of the SBC layout: this scheme is called Model 3.

**Table 5.** Layout of the bearings in Model 3.


#### **4. Results and Analysis**

*4.1. Analysis of Natural Vibration Characteristics*

The first three natural periods of all the models are shown in Table 6. Due to the influence of the fixed bearings of columns 2#–9#, the first three natural periods in Model 1 demonstrated little change compared with the original model. Compared with the original model, the first-order natural periods of vibration of Model 2 and Model 3 varied greatly. The first-order natural vibration period of Model 2 decreased by 12.2%, and the first-order natural vibration period of Model 3 decreased by 12%, which was closely related to the increased lateral stiffness when using the SBCs.


**Table 6.** Comparison of the first three natural periods of models.
