The Static And Dynamic Analysis And Experimental Intestigation To The Multi-Stepped Prestressing Arch Truss String Structure

The pre-stressed arch truss string structure is one of the new pre-stress steel structure styles, because it possessed of rational mechanical feature, it has been used in many national and foreign engineering practices. The carrying capacity of this structure can be effectively improved by multi-stage pre-stressing in construction process. Different design parameters bring great influence to seismic behavior. This paper analyses multi-stage pre-stressing and different parameters produce the impacts to static and dynamical behavior of the structure by theoretical calculation and experimental research. The conclusion can provide reference to static and seismic design of arch truss string structure. The main issues in the paper are:The multi-stage pre-stressing loading experiment is studied in this paper. The actions that multi-stage pre-stressing can reduce the internal force peak value and improve the stiffness are researched in this paper. Through finite element calculation, the internal force peak value and displacement peak value of different loading measures are compared. The experiment results and calculation results are compared too; the conclusion that arch truss string structure can be applied in multi-stage pre-stressing construction is achieved.The pre-stressed arch truss string structure natural vibration characteristics experiments are researched in this paper. Because the reality modes of structure mostly are vertical direction arch truss vibration, so model vibrations in outer plane are restricted in analysis. In experiment, the front three modes of vertical directions are achieved through vibration exciter in the structure. Depending free vibration attenuation curve can achieve damping ratio characteristics. This paper analyses the impacts of different restrains, different loads and different pre-stress value of cable on the natural vibration frequency, damping ratio and mode of structure. The experiment results are compared with the finite element analysis results, they inosculate well.Model shaking table test also is researched in this paper. The level first frequency variety regularity following the pre-stressing cable value is achieved through white noise sweep checking. The conclusion that model is in elastic work stage is achieved...