Study On The Present Structure And Seismic Performance Of Jiayuguan Wooden Structure Building

The ancient Chinese wooden structure is not only a product of the combination of labor and wisdom of the working people of China,but also an important material cultural heritage and cultural treasure of China.Jiayuguan,as an important gateway to the western end of the Ming Great Wall,has extremely important historical and cultural values.This paper took Jiayuguan Guanghua Building as the research object and provided theoretical basis for the protection of ancient buildings.In this paper,the structural system,structural members and joints of wooden structures were firstly explained.The corresponding elements and material parameters were selected according to the finite element analysis.On this basis,in order to explore the current structure of Jiayuguanmu structure and seismic performance,combined with structural theory analysis,respectively established a finite element model of pure wood frame structure,a structural finite element model containing brick wall cylinders and a structural finite element model considering deformation damage.The ANSYS finite element analysis software was used to perform static analysis,modal analysis and seismic response analysis on three models.Through three aspects of finite element numerical simulation,the research shows that:1)Under the load combination,the deformation of the pure wood frame is 70.9 mm,and the maximum displacement of the structure containing the brick wall is 25.4 mm.For the structure considering the deformation damage,the displacement of the three-storey roof with the largest deformation up to 27.4 mm.2)The first 15 natural vibration frequencies of the pure wood frame structure are less than 10 Hz.After the brick wall is included,the first 15 orders of natural vibration frequency of the Guanghua Building are significantly increased,and the overall structural rigidity is significantly improved.After considering the influence of deformation damage,the natural frequency of each step of the Guanghua Building is reduced,and the higher the vibration mode,the more obvious the reduction of the natural frequency.Compared with the original light-emitting building containing brick walls,the high-order mode of the Gwanghwa Building changes from partial rotation to overall rotation,and the structure tends to be more deformed,making it easier to overturn damage.3)For the pure wood frame,the dynamic amplification factor and displacement peak of the structure are obtained under the action of El-Centro wave,Taft wave and Lanzhou wave with 55 gal,150 gal and 310 gal acceleration peaks,among which El-Centro wave action The dynamic response of the lower structure is the largest,and the dynamic response of the structure under the Lanzhou wave is the smallest.After the brick wall is included,the dynamic response of the structure under the action of El-Centro wave is greatly reduced.The dynamic amplification factor of the three-layer column is reduced by about 73%,and the peak displacement of each layer is also significantly reduced.After considering the structural deformation damage,under the same El-Centro wave effect,compared with the brick wall cylinder photochemical building model before the deformation damage,the amplification factor of one layer of the mast increases by 11.2% on average,the two-layer mast The amplification factor increased by an average of 2.9%,and the three-layer top magnification factor increased by an average of 10.6%;the displacement peak of each measurement point also increased slightly.