Analysis Of The Wind-induced Vibration Response Of FRP-steel Tube-in-tube Chimney

In this paper,based on engineering and theory analysis the along wind induced responses of a new type of chimney structure,GFRP-steel tube-in-tube chimney.For towering structure such as chimneys,the wind is the main load during the service period,and the reasonable wind resistance design is an important factor.Analysis of mechanical response of GFRP-steel tube-in-tube chimney under natural wind has a positive significance for the design and engineering application of chimney structure.For GFRP-steel sleeve chimney,suspension device and shake-restrained appliance as the connecting component of the inner cylinder and the outer cylinder,research the influence between the position and the mechanical properties of the chimney,provide theoretical basis for the design of chimney structure.The specific work carried out in this paper is as follows:(1)Combined with practical engineering,aiming at the new chimney structure of GFRP-steel tube-in-tube chimney,considering the interaction between the inner and outer tube,,based on the finite element structural analysis theory,established overall model of the combined effect of inner cylinder and outer tube.(2)The effect of natural wind on structure,generally it is regarded as the superposition of average wind of static effects and fluctuating wind of dynamic effects.In this paper,analysis of the effect of fluctuating wind on structure it is regarded as a stationary Gaussian random process,based on the harmonic superposition method,the Davenport wind speed spectrum is used to obtain the power spectrum of fluctuating wind load,simulate the wind time history curve of the chimney with fluctuating wind.(3)By using modal superposition method combined with finite element analysis software,analysis transient response of the chimney structure under the time-history load of fluctuating wind load.Based on the random vibration theory,the equivalent fluctuating wind load of chimney structure is calculated,obtain the mechanical response of chimney under equivalent static load.Comparison of the two results,combined with the structure of wind resistance design requirements,analysis of the structure of the wind safety performance.And in accordance with the ASME standard of composite laminates of the relevant requirements,to analyze the strength of the inner cylinder.(4)Analysis of chimney structure,shake-restrained appliance and suspension device is the main way to transfer the force between the inner and outer tubes.Combined with the structure optimization design theory,take the displacement response of the chimney and the stress distribution of the inner cylinder as the optimization objective function,analysis of the influence between the position of suspension device and shake-restrained appliance and the objective function.Through the analysis of optimization results,research the optimization scheme of the position of suspension device and shake-restrained appliance for the design process of GFRP-steel sectional suspension tube-in-tube chimney,provides a theoretical basis for the design and application of the chimney.