To improve seismic performance of double-deck frame bridge system, a novel precast double-deck rocking frame bridge pier system is developed based on ductile and rocking seismic conception design in this paper. In this novel system, the upper columns are allowed to rock between the precast cap beams to form the rocking story, while the lower columns are connected to precast cap beam and footings by grouted splice sleeve to form emulative cast-in-place story. The seismic response of this novel frame bridge pier system is investigated. Nonlinear equations of motion of the system are established following Lagrange's equation and conservation of angular momentum, and the analytical model is used to conduct case study, parametric study and stability analysis. The results show that seismic responses of the lower columns of the proposed structural system are smaller than cast-in-place bridge pier, while it has an opposite trend for upper columns. The effect of deformability of the lower story on the stability of the system is marginal for low-frequency pulses or small column size, while for high-frequency pulses or large column size the deformability jeopardizes the stability of the system.

为了提高双层框架桥系统的抗震性能，本文基于延性和摇摆地震概念设计，开发了一种新型的预制双层摇摆框架桥墩系统。在这个新颖的系统中，上柱被允许在预制的帽梁之间摇摆以形成摇摆的故事，而下柱则通过注浆的拼接套管连接到预制的帽梁和基础上以形成现场浇筑的故事。研究了这种新型框架桥墩系统的地震响应。根据拉格朗日方程和角动量守恒建立了系统的非线性运动方程，并使用分析模型进行了案例研究，参数研究和稳定性分析。结果表明，所提出的结构系统下柱的地震响应小于现浇桥墩，而上柱则具有相反的趋势。下层的可变形性对系统稳定性的影响对于低频脉冲或较小的色谱柱尺寸而言是微不足道的，而对于高频脉冲或较大的色谱柱尺寸，可变形性则会危害系统的稳定性。