Precast segmental bridge pier structure with combined shear keys and seismic performance analysis
LI Chen1，JIANG Hui1，GUO Hui2,3，MA Xinyi1，SONG Guangsong1
1.School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;
2.State Key Laboratory for Track Technology of High-speed Railway, China Academy of Railway Sciences, Beijing 100081, China;
3.Railway Engineering Research Institute, China Academy of Railway Sciences Co., Ltd, Beijing 100081, China
Aiming at the shortage of shear and torsion resistance capacity of precast segmental bridge pier under earthquake excitation, the combined steel sleeve (dowel) shear keys were developed, and a new structural scheme for precast segmental pier was proposed.Based on the ABAQUS platform, a simulation method with solid finite elements was developed and tested, and the complex nonlinear mechanical behaviors were considered in the model.The effects of main parameters of tendon and shear keys were systematically discussed by quasi-static analysis.In addition, near and far field ground motions were selected for nonlinear dynamic analysis, and the effectiveness of combined shear keys was also tested.The results show that, shear resistance capacity of pier can be enhanced by improving tendon ratio; however, the residual displacement under strong earthquake is increased accordingly.By properly setting the tendon ratio, the maximum strength of a precast segmental bridge pier can be equivalent to that of a cast-in-place pier.Moreover, increasing the embedded depth of shear key and the diameter of steel dowel can effectively improve the shear resistance capacity of the bridge pier, the minimum embedded depth of shear key and the maximum diameter of steel dowel should be reasonably controlled.Furthermore, under bidirectional ground motions, the combined shear keys can not only effectively limit the joint opening, slip and torsion deformation, but also significantly improve the shear and torsional capacity of the pier.
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