The post-earthquake emergency response depends on the traffic efficiency of the transportation network system. The bridge is the key factor affecting the reliability of the transportation network. Due to factors such as low design standards and performance degradation, the bridges built in the early days had low seismic performance. In fault regions, the pulse effect will also increase the seismic demand of the structure. In this paper, a friction core rubber bearing (FCRB) is proposed for seismic retrofit of road network bridge. Then calculate the fragility of bridges with and without retrofit under pulse and non-pulse effect, and the bridge traffic capacity under several road network conditions. The total travel time of the road network is used as a quantitative index of the reliability of the transportation network, and the prioritization of bridge retrofit under the limited budget and the assessment method of road network seismic risk are proposed. By comparing the difference of total travel time of road networks under different working conditions, the influence of pulse effect and the effect of FCRB are analyzed. Finally, a case is given to illustrate the effectiveness of FCRB in retrofitting the road network bridge and the necessity of considering the pulse effect. The results show that: it is necessary to consider the influence of pulse effect in road network risk assessment with high earthquake magnitude; the bridge retrofit prioritization takes into account the bridge traffic flow and the bridge traffic capacity, which is easy to calculate and can identify the critical bridges that have an important influence on traffic efficiency; with the increase of earthquake magnitude, the seismic risk of road network presents a geometric increase trend; FCRB can significantly reduce the road network seismic risk, and the seismic risk can be reduced by more than 50% if 20 bridges are retrofitted; with the increase in the number of retrofitted bridges, the decreasing trend of the annual seismic risk changes from fast to slow, and finally tends to be flat, which verifies the effectiveness of the retrofit prioritization.

地震后的应急响应取决于交通网络系统的交通效率。桥梁是影响运输网络可靠性的关键因素。由于设计标准低和性能下降等因素，早期建造的桥梁的抗震性能很低。在断层区域，脉冲效应也会增加结构的抗震要求。本文提出了一种摩擦芯橡胶支座（FCRB），用于路网桥的抗震改造。然后计算在脉冲和非脉冲作用下有无改造的桥梁的脆性，以及几种路网条件下的桥梁通行能力。道路网的总行驶时间被用作交通网络可靠性的定量指标，提出了在预算有限的情况下桥梁改造的优先次序和路网地震危险性评估方法。通过比较不同工况下路网总行驶时间的差异，分析了脉冲效应和FCRB效应的影响。最后，给出了一个案例来说明FCRB在改造路网桥方面的有效性以及考虑脉冲效应的必要性。结果表明：在地震烈度较高的路网风险评估中，有必要考虑脉冲效应的影响。桥梁改型的优先级考虑了桥梁的交通流量和桥梁的交通容量，易于计算，可以识别对交通效率有重要影响的关键桥梁。随着地震烈度的增加，路网的地震风险呈几何上升趋势。FCRB可以显着降低路网的地震风险，如果对20座桥梁进行翻新，地震风险可以降低50％以上；随着改建桥梁数量的增加，年地震风险的下降趋势由快变慢，最终趋于平缓，验证了改建优先次序的有效性。