Analysis and optimization of a continuous composite bridge with uplift-restricted and slip-permitted connectors

To improve the cracking resistance of reinforced concrete (RC) slab at hogging moment region in continuous composite bridge system, a new connection concept called the uplift-restricted and slip- permitted (URSP) connection has been proposed. This paper presents both the design and analysis of a three span continuous composite bridge where URSP connectors were used. Based on design process of the project, some practical design guidelines and construction methods are proposed for the application of URSP connectors. Finite element model of the bridge considering construction process is established according to the case project. Simultaneously, another model of the same bridge with only stud connectors is built for comparison, the results show that URSP connectors can effectively improve the cracking resistance behavior of RC slab with little influence on the overall stiffness and strength of the composite beam. Furthermore, the optimization analysis of URSP connector at structure level is studied. The design guidelines and the analysis results in this paper can provide a reference for further study on the application of URSP connectors in continuous composite bridge system.