关键词: 简支变连续梁, 模型试验, 支座更换, 纵向单点(逐墩)顶升, 顶升量

Abstract: The simple support-continuous girder bridge is widely used in the highway construction. With the increase of operation period of bridge, the issues of bearing replacement must be faced. Aiming at the case of transforming the high piers bridge with simple support to T continuous girder bridge on the Shuima Highway in the mountainous area, and the new method of bearings replacement is put forward by model test. This method is called longitudinal single-point（ followed by pier）, lateral synchronous jacking-up. Taking the safety of girder body in the lifting process as the goal, the limits of lifting bearings for T girder bridge of 20, 30 and 40 meter span are obtained respectively. The results show that the new method ＂longitudinal single-point（ followed by pier）, lateral synchronous jacking-up＂ is reasonable and feasible, and the structural safety is assured. It has provided a new method and a new way for bearing replacement of similar bridges.

Key words: simple support-continuous girder , model test , bearing replacement , longitudinal single-point （followed by pier） jacking-up , jacking-up height ;