Experimental Study On Mechanical Performance Of The Precast Hollow Slab Beam Bridge

Precast hollow slab bridge has a pivotal position with the development of the transportation industry in China, especially for short and medium span bridges, application of the precast hollow slab structure is the most common. It has a pre-simple, convenient construction, adaptable, and many other advantages, play the role of connecting traffic and across ravines. However, since the form of precast hollow slab bridge come out, the biggest problem which plagued its development is that disease problems continue to produce and difficult to overcome. Although many scholars have been studied the characteristics of hollow bridge system for decades, and with the development of technology，hollow slab beam bridge is improving, but it still can not completely avoid the occurrence of disease. Therefore, in-depth study on mechanical performance of precast hollow slab bridge, investigating the root cause of the disease, proposing special improved method for this particular form has a very important significance. In this paper, through experimental and theoretical perspectives on the mechanical properties of the hollow slab beam bridge analysis were as follows:This article studied the mechanical characteristics of the hollow plate girder bridge firstly. Focus on the principle and problems of transverse load distribution. Hollow slab and hinge joints mechanical characteristics of each were discussed. The characteristics of hollow bridge the current design methods was studied and the problems and errors caused in hollow slab beam bridge design methods were founded.On the basis of Full-size model test K0+638.5bridge in Baishan,Jilin Province Fusong Highway302interchange diversion engineering tenders, using the test results of the hollow slab beam bridge,load transverse distribution was studied, variation hinge joints and internal stress distribution and the law of development of cracks after the bridge destruction were observed. Failure process of trial and failure mechanism of hollow slab beam bridge were studied.Using finite element analysis software ANSYS finite element model of the full-scale test of the hollow,this article compared the intrinsic link three model calculations and experimental analysis results on the main difference from the transverse load distribution, beam deflection, hinge joints stress and found the current design methods exist certain conservative. Integrated finite element analysis and experimental results of the real bridge, three suggestions for improvement for the hollow slab beam bridge that arched structure in the form of longitudinal reinforcement, construction methods hinge joints and layered pouring new structure in the form of hinge joints and transverse bending steel structural form were made.Greatest achievement of this article is to use two different methods to analyze the overall structure of the hollow slab beam bridge by force from the elastic properties of the session until the damage stage.and this will provides sufficient theoretical and experimental reference for future development and research of precast hollow slab beam bridge.