Design optimization method for T-beam bridge section

Abstract

The invention discloses a design optimization method for a T-beam bridge section. The method comprises steps as follows: deformation potential energy and kinetic energy of a T-beam bridge are acquired firstly, a vibration control differential equation and a natural boundary condition of the T-beam bridge are derived with an energy variation method, related applications are programmed on the basis of the vibration control differential equation and the natural boundary condition, and fine analysis of the structural dynamic characteristics is performed by the aid of Matlab software. Finally, an inherent frequency value of the T-beam bridge is taken as criterion, that is, the inherent frequency is high, the structural deformation potential energy is low, then the section size of the T-beam bridge tends to optimization, meanwhile, the structural static analysis further proves the effectiveness of the method, and the T-beam bridge is in a good mechanical state by means of the optimized section size, so that the diseases such as beam body breakage, stiffness reduction, excessive down warping of midspan and the like are avoided. The design optimization method for the T-beam bridge section has clear mechanical conception and simplicity in calculation as well as good application value, and is the beneficial supplement for the design theory of the T-beam bridge.

Description

technical field [0001] The invention relates to a method for optimizing the section design of a T-shaped girder bridge, which belongs to the technical field of bridge construction. Background technique [0002] At present, many concrete T-girder bridges in operation have serious bridge defects, such as severe cracking of the flange and web, reduced beam body stiffness, and excessive mid-span deflection. safety. Then, under the premise of satisfying the function of the bridge structure, how to adapt to its mechanical characteristics and screen out the T-beam section with excellent mechanical properties has become the goal of unremitting efforts of the majority of bridge workers. Because of the reasonable section form, it not only improves the mechanical properties of this type of structure, but also improves the spanning capacity of the T-girder bridge, and will effectively avoid many bridge diseases, so that this type of bridge is in good working condition. Therefore, the ...

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Problems solved by technology

Therefore, there are many safety hazards in this type of bridge in operation, such as the reduction of overall stiffness, cracking of the flange and web, and excessive mid-span deflection, etc.

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