Studies On The Isolated Reinforcement Of An Ancient Masonry Pagoda In SiChuan

For the unique geographical location and favorable natural environment, Sichuan has retained almost all types of Chinese ancient masonry pagoda, which has become indispensable part of the cultural characteristics of Sichuan. However, since the ancient masonry pagoda has been built, it is constantly subjected to the harm of environmental factors and human factors so on. Many masonry pagodas are facing the threat of damage. In the earthquake of Wenchuan and Lushan, a large number of ancient masonry pagodas are subject to varying degrees of damage, and even appeared extremely serious damage fracture, collapse and so on. How to protect the safety of masonry pagoda effectively seems imminent.Taking the Bai Pagoda in ZhenguoTemple as the research object, establishes three-dimensional solid model of Bai Pagoda in ABAQUS, and compares it with the experimental result on the dynamic properties to get more accurate dynamic calculation model. As a basis to explore the effects and feasibility of base isolation technology used in reinforcement and protection of the ancient masonry pagoda, provide a reference for the development of reinforcement and protection technology of the ancient masonry pagoda. The main contents include:(1) With field measuring of the geometric parameters of Bai Pagoda, this dissertation establishes three-dimensional solid finite element model of the Bai Pagoda and takes modal analysis. By comparing the Bai Pagoda dynamic characteristic parameter measured values and analog values, this dissertation verifies the reasonability of three-dimensional solid finite element model in Bai Pagoda.(2) Through the calculation of the isolation bearing tensile ability under strong earthquake preliminary layout to determine the appropriate isolation layer. By comparing the different layout of isolation layer, this dissertation discusses the influence of horizontal stiffness of isolation layer and aspect ratio on the tension of isolation bearings.(3) Two seismic waves recorded by the seismic station closer to the Bai Pagoda in Wenchuan earthquake and Lushan earthquake were selected, so does an artificial seismic wave. Then, analyzes the three-dimensional solid model of Bai Pagoda by elastic time-history analysis method. This dissertation compares the seismic performances of Bai Pagoda with and without isolation reinforcement and checks the anti-overturning capability of the Bai Pagoda reinforced by base isolation reinforcement under strong earthquakes.This dissertation makes a useful exploration in the reinforcement and protection of the ancient masonry pagoda and provides a reference for base isolation technology used in reinforced and protected ancient masonry pagoda in the future.