Research On Shear Mechanical Property Of Corrugated Steel Webs

Composite bridge with corrugated steel webs is a new type of composite structure, which uses the corrugated steel webs instead of the concrete webs. It has many advantages, such as a clear stress path, high material utilization, light, beautiful,efficient, durable, and avoiding the cracks of the concrete webs. It effectively improves some defect of traditional concrete bridge. It's a better selection for bridge type in city and scenic. It has spread and applied in our country. In recent years, a upsurge in construction of this type bridge is making.Based on the project of Shan Xi Provincial Transportation Department of Science and Technology project(12-21K), this paper takes girder with corrugated steel webs as the object of the study. By means of statistics induction, experimental study, finite element analysis, calculation of projects, this paper focuses on Shear Mechanical Property of Corrugated Steel Webs, including shear buckling strength, shear stress and shear deformation. Generally speaking, the main contents and conclusions are as follows:(1)In first part, summarizing the development and application of girder with corrugated steel webs at home and abroad, then describing the structure advantages and mechanical characteristic of corrugated steel webs. At last, reviewing the research situation of Shear Mechanical Property of Corrugated Steel webs.(2)In second part, firstly, researching some actual project of beam with corrugated steel webs, and generalizing the dimension of webs. Then based on the condition of occurring both local and global shear buckling modes respectively, four H-shaped steel beams with corrugated steel webs which are tested to obtain the shear buckling modes and loads of webs are designed. We can obtain some conclusions from the experimental results. The corrugated webs bear most of the shear evenly. Global shear buckling happened along all or most parts of webs, and occurred great lateral deformation. However, local shear buckling happened along single part of webs, and occurred light lateral deformation. Because of the initial lateral dimension imperfections, the shear buckling strength of corrugated webs were discounted.(3)According to the conditions of corrugated steel webs used in composite bridges, this paper studies the elastic shear buckling strength and, including global,local and interactive buckling. The formulae and corresponding scopes were derivedat the same time. Analyzing four group no-linear shear buckling strength formulae through comparing six group experimental results. As a result, the proposed no-linear shear buckling strength formulae have good agreements in the given scopes. At last,the test and finite analysis results of this paper were submitting to validate the proposed formulae.(4)Formulas of shear stress bore by concrete top, bottom and steel webs respectively were proposed. The ratio of shear force assumed by the webs to the whole shear force in section were about eighty percent through calculation results.Deducing the formula of calculating the deflection of uniform section composite bridge with corrugated steel webs considering shear deformation meanwhile. The proposed formula is simple and accurate relatively, comparing the formula of Li Hong jiang, He Jun and Euler beams through calculation results. At last, the design process of shear resistance were proposed.(5)Introducing the process and fabrication key technology of corrugated steel webs, such as the selection of steel type, shaping, welding, connection, anti-corrosion and so on. Meanwhile some analyses and proposition were derived.