Research Of SHCC Link Slab In Jointless Bridge

Short-medium bridges are very common among the existing bridges, and those bridges are widely designed as precast simply supported beams. The bridges need to be set expansion joints and bearings at the abutments.The disadvantage of this system is the vehical bumping phenomenon passing the joint between abutment and approach. In addition, troubles of joints occur frequently, so many existing simple supported beam bridges need periodical maintenance such as rubber bearing replacement. It is estimated that yearly maintenance fee is as high as 15% of the total cost. "Beam bridge with continuous deck" is jointless bridge system, which gets longer continuous deck without the expansion joints. It has both the mechanical characteristics of the simply-supported beam bridge, and can provide a continuous lane for vehicles, thus ensuring the smooth, safety and comfortable driving in high speed. The system maintains the design intention of simply-supported beam bridges, while playing the superiority of the continuous deck as well."Beam bridge with continuous deck" focuses on the performance and design of link-slab connecting adjacent deck of two spans between supports. Based on the excepted performance and deformation required of link-slab, mechanical theory and its impact on the continuously level of bridge were studied, which is an active adaption idea. In order to meet the needs, we carried out some experiments and obtained target mix proportion of strain-hardending cement-based composites.According to the results of tests, the material with targeted mix proportion was used in the link slab, and the formulas was derived considering debonded zone, with the formula being related to material parameters, geometry and debonded length.In addition, the performance analysis using the method was compared with ordinary concrete deck bridges for various spans. The length of the debonded zone ranges from 0% to 10%. Numerical simulations have also been carried out by ANSYSs,a general FEA package, and the results shows that the SHCC link-slab jointless bridges are all of performance well and meet the requirements of the bridge compared to the ordinary concrete deck bridges except for the 0% debonded zone. It indicates that approach is feasible and the construction, is conveninent, it not only can be used for practical new bridges design but also for retrofitting the seams of the existing bridges.This study shows that the link slab behavior is more similar to a bending component, and the suggested reasonable length of debonded zone, which guarantee the performance of the bridge. The study provides a feasibile method for jointless bridges, which is important for design and engineering applications in the future.