Modeling analysis method for complex cable net system

Abstract

The invention discloses a modeling analysis method for a complex cable network system, which adopts a substructure modal synthesis method and a model order reduction method to form a function of analyzing the dynamic characteristics and dynamic response of the cable network system. Each main cable in the cable net structure is considered as a sub-structure, and the model of the overall structure is established by coupling the deformation continuity and stress balance of each sub-structure at the damper / connecting piece connecting position and the mechanical characteristics of the damper / connecting piece. The established model can be used for analyzing the response of an actual cable net under the action of an external load, and can be used for complex eigenvalue analysis to obtain the frequency, damping and vibration mode of the system; the established model is a dimensionless model and can be used for researching general characteristics of a cable net structure and designing parameters of dampers and inter-cable connecting pieces so as to optimize the vibration control effect of a cable net system.

Description

technical field [0001] The invention belongs to the field of structural vibration control, and relates to a modeling and analysis method for a complex cable net damping system composed of cables-dampers / connectors. Background technique [0002] Vibration control of flexible structures such as cables and suspenders is an important guarantee for the safety and durability of long-span bridge structures (cable load-bearing bridges, under-supported and intermediate-supported arch bridges) and tall building structures (such as mast structures). As the main load-bearing components of the structure, cables and suspenders are prone to vibration under the action of wind, wind and rain due to their small lateral stiffness and self-damping, which affects their service life. As the span of the bridge increases, the length of the cables also increases, and the length of the cables used on cable-stayed bridges is now close to 600 meters; it is difficult to completely suppress the multi-mod...

AI Technical Summary

Problems solved by technology

In order to achieve the required calculation accuracy of the finite difference model, the cable needs to be divided into multiple segments, so the number of degrees of freedom in the established model is large and the calculation efficiency is low

The method based on modal expansion is currently mainly aimed at single-cable systems, and its combination of static correction functions can reduce the number of degrees of freedom in the numerical model, but this method has not been extended to complex cable-net systems

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