Research On The Anti-Seismic Behavior And Material Strength Of Ancient Masonry Pagodas In Yibin City

As a historic cultural city, the ancient buildings' protection and reparation of Yibin become the indispensable part of the city's development. Today, there are 9 ancient masonry pagodas which had been built for 180～900 years in Yibin area. The strength of their bodies has accordingly appeared lots of different phenomena of airslaking and fading. Because most area of Yibin is located in VII earthquake area and as the strength of the pagoda bodies is declining, the research on seismic capacity of the ancient masonry pagodas and which appropriate reinforced methods to be adopted have become increasingly important tasks in the protection of the ancient building in Yibin area.The main research objects of this thesis are 9 ancient masonry pagodas existing in Yibin area. First, in order to obtain corresponding strength values and correlation rules of the ancient pagodas, the strength of them was detected by means of the rebound method. Then, related methods and models of the seismic behaviors about ancient building were researched on further. Compared with them, a suitable method about which seismic behaviors of ancient masonry pagodas in Yibin area to do calculation and analysis was selected. The main content of the research includes five aspects as follow:1.Through largely collecting data of ancient masonry pagoda buildings and combining with specific history,humanity and area condition of ancient masonry pagoda buildings in Yibin area, main destruction mechanism about ancient masonry pagoda buildings is analyzed in this thesis;2.By researching on the rebound method of non-destructive testing technology, the value of ancient masonry pagodas which existing in Yibin area was detected, then the correlation rules about which time,area,floors of material strength of ancient masonry pagodas in Yibin area can be got;3.In this paper, based on the research on the current situation,general mechanisms,advantages and disadvantages of seismic behaviors about ancient building, it is emphatically to analyze Sun Zengshou's simplified model method about seismic behaviors of ancient masonry pagodas, modify correlation parameters and do seismic behaviors on ancient pagoda buildings inYibin area.4.By the method of finite element analysis(FEM) and the software of ANSYS, the simplied pagoda models were established. With the result of material strength by detecting, elastic modulus, correlation size and corresponding ground soils characteristics, the ancient pagodas models in Yibin were established; the earthquake disaster was simulated by inputing corresponding seismic waves about history earthquake in Yibin; then seismic behaviors are analysed in this thesis.5. Some suitable reinforced methods were put forward by analyzing destruction model of ancient masonry pagodas in Yibin and combining with history reinforced method about ancient masonry pagodas in Yibin.