Experimental Study On New Type Semi-integral Abutment Bridge

New type semi-integral abutment bridge cancels expansion joints (including the expansion joints between end beam and abutment), and shifts away the beam thermal movements to the end of the run-on slab, which are absorbed by soil body of definite length range behind the abutment. The bridge structure not only cancels the deck joints, but also road joints. Comparing with the same category overseas jointless bridges, the new type bridge has more reasonable structure, more simple and convenient construction, and better use effect etc. The main work in this paper is described as follows:(1)This paper introduces phylogeny and reseach survey of the joints bridge inland and abroad, and a new jointless bridge structure—new type semi-integral abutment bridge is based on these, which characteristic of own structure and setting of primary component are expatiated.(2)This paper analyses influence of temperature effect, creep, shrinkage and circumambient soil of run-on slab on the new type structure, and analyses the forcing performance of beam, abutment and run-on slab of the new type semi-integral abutment bridge, and constrast to the same category joints bridges. Interaction of run-on slab and soil is simulated by"m"method, run-on slab is constrained by soil through the vertival and horizontal, advances computing model of new type semi-integral abutment bridge.(3)This paper takes Hengyang Dashuiting middle bridge for test supporting project, designs full scale model test which can reflect truly interaction of beam, run-on slab and the embankment behind the abutment of new type semi-integral abutment bridge. shrinkage deformation of beam in temperature fall stage is simulated through jack stretching test model, and expansion deformation of beam in temperature rise stage is simulated through jack pushing out test model. Influence of soil body behind the abutment stress distribution and stress carry-over length due to different coefficient of friction is analysised, through the experimental results and the space finite element analysis results of the model, actual measurement results tally with the computing results well.(4)New type semi-integral abutment bridge is from optimization design of conventional abutment bridge-dashuiting middle bridge. Not only bridge at both ends...