The Feasibility Study Of Prefabricated Pier Friction Self-Locking Connecting Device

With the development of transportation infrastructure in China, a large number of bridges will be replaced and renovated in the next few decades. Bridge reconstruction will inevitably influence the traffic on existed road and bring larger social costs. So it is imperative to develop a kind of rapid bridge construction technology. Precast assembly technology which applies factory production on-site assembly to avoid a lot of on-site process can achieve the rapid construction of bridge. By effectively controlling the construction quality and reducing the interference to surrounding environment, utilizing precast assembly technology in the bridge reconstruction projects become the trend in the future.Presently, the precast technology is comparatively mature in the bridge superstructure, but it is seldom used in bridge substructure,and most of the existing bridges using precast substructure are located in the low intensity area. Due to the weight restrictions of lifting and transportation, piers have to be prefabricated in segments. The connecting part of the precast segment may become weak point under the action of earthquake, which greatly limits the application of prefabricated bridge pier in engineering. Few of domestic research have been conducted on the seismic response mechanism of precast assembly piers. The design and construction method of the connection structure is still under the exploration.With the development of seismic technology, the engineering community has strictly required on the earthquake damage and residual deformation of the structure besides the seismic safety performance. Previous studies showed that the reasonable design of connecting can make the prefabricated bridge pier to perform better than traditional cast-in-situ pier in seismic resistance.This paper aims to reduce the damage and residual deformation caused by the quake. We designed a kind of prefabricated bridge pier connecting structure base on the principle of friction self-locking. The 3D simulation model of the friction self-locking connection structure is simulated by using the finite element software ABAQUS. The influence of key design parameters on the hysteretic behavior and the component stress of the connection structure are studied. Then, based on the practical application, the design details of the friction self-locking connection structure are optimized. The response of the friction self-locking connection structure under the action of the earthquake is analyzed.The results show that the design of friction self-locking connection structure can achieve the design goal of low damage and low residual deformation. The feasibility of its practical application is preliminarily verified.