Further Research On Mechanical Roperties Of Long-Span Steel Bridge Deck Surfacing

In recent decade, more and more long span bridges are constructed with the rapid development of infrastructural investment. For deceasing load and increasing the span, the orthotropic steel deck is generally applied for the long span steel bridge. Compared with the general road, bridge deck surfacing has special structures. Climate and temperature have great influence on its location and damages it easily. For the bridge deck surfacing is one of the crucial techniques of the construction of the long span bridges, the problem of surfacing has been widely researched in the manufacture of materials, structure optimization of orthotropic steel deck, technical development of construction and so on. Those have important signification to the development of the science research and the practice of engineering.The mechanics of steel deck surfacing are analyzed in this dissertation on the basis of RunYang Bridge. When detailed analysis, make the steel plate, trapezoid stiffened rib, pavement and transverse beam as a system of pavement, 3D Finite Element Analysis program is used.First, mechanics analysis model of orthotropic steel deck pavement system is established. Based on analysis the mechanics property and damage rules of the surfacing under the load, the location of critical load is determined, the rule of stress and stain on orthotropic steel bridge surfacing is studied and indexes of design is advanced. Allow for the property of elasticity-plasticity in the asphalt concrete under loading, the mechanics property of isotropic hardening materials is studied. Secondly, the mechanics inference of the moving vehicle load with certain speed is numerically simulated and the mechanics property of surfacing system under different speed is discussed. Lastly, optimization parameters of designing surfacing system are gained from the analysis of the geometrical size of the orthotropic steel deck, the depth of pavement and the elastic modulus of materials for the long span steel deck surfacing system.The conclusions of this dissertation can be used straightly on the design of bridge structures and bridge deck surfacing, and as a base for farther analysis.