Dynamic Analysis Of Dry-jointed Structure

The common dry-jointed structure includes the traditional dry-jointed masonry structure,the ancient timber-frame structure of Chinese and other space multi body composite structure system.This kind of structure is simply supported by a plurality of block members according to certain rules,and has no cementation between components.At present,there are few researches on the structure of the dry-jointed structure,and the existing research on dry-jointed structure is mostly based on the theory of continuous frame structures,which is quite different from actual condition.In this paper,based on the characteristics of the dry-jointed structure,the multi body dynamics and the discrete element method are used to analyze the structure of the simple block,and then to analyze the typical structure of the dry-jointed structure,Yingxian Wood Pagoda.Using the method of theoretical mechanics and discrete element,obtain the the motion state of a single block,multi block and block assembly structure under seismic action.It is found that the structure of the dry-jointed structure is affected by the size of the block,friction coefficient of contact surface,pressure,dynamic wave amplitude,dynamic wave frequency and the supporting conditions.Increasing the aspect ratio and the effective support boundary,and reducing the friction coefficient can increase the stability of the dry-jointed structure.Through the literature collection and field investigation,summarizes the mechanism of the structural layout and force transfer of Yingxian Wood Pagoda,built discrete element model of Yingxian Wood Pagoda,and dynamic research is done for it.The sliping of platforms and swing of columns is the main reason to isolate seismic action.Finally,according to the results of analysis,summary the seismic mechanism and collapse mechanism of Yingxian Wood Pagoda,and then give the advice of reinforcing measures.The research results can provide reference for the protection of ancient buildings and the evaluation of safety performance of ancient buildings,and can also be used to explore the available analysis methods for the modern dry connection prefabricated structure and multi body composite seismic isolation structure.