Shaking Table Test On Reduced Scale Model Simulated Ancient Masonry Pagoda

Located in the earthquake areas of high intensity earthquake damaged brick pagoda, most pagodas have been temporarily reinforced repair. However, the brick pagodas were destroyed in the earthquake formation mechanism need further in-depth exploration. Masonry pagoda structures in seismic dynamic response process, the failure model of the distribution and evolution of damage with the time changing, for the study of scientific and rational reinforcement and restoration measures to enhance the performance of Earthquake Disaster Prevention pagoda structure has theoretical significance and application value. In view of this, the topics to the earthquake brick pagodas high intensity areas as research samples. By shaking table test and numerical simulation analysis, seismic study was to investigate the dynamic response of the structure of masonry pagoda.First, we developed a small shaker suitable for vibration tests pagoda models and analyzed geometric characteristics and structural features of the pagodas structure. Extract the basic parameters of Sichuan typical square planar structure of the pavilion-style pagoda designing pagoda model.In accordance with structure constructed and the failure mechanism of masonry, select a variety of materials and processing technology, developing a special type of adhesive small brick and mortar, additional stiffness and mass model is analyzed to calculate, make a small scale model of the basic power structure characteristic parameters suitable for the use of small shaker vibration test.Second, study small pagoda shaker vibration test, loading conditions, test procedures and related technologies. Selection of the earthquake in Shi fang octagonal seismic waves, use software tools for seismic data filtering the original records, correction and adjustment, make a small scale model of seismic wave excitation and adjusted in the modified original prototype structure under seismic wave excitation and response peak spectral characteristics converge. Check small shaker system, contrast peak ground motion data input and output table vibration data. Linear correction of the input data, form new input vibration data, make consistent countertops output characteristics of the initial shock wave seismic data and input features.Third, make vibration test for different models, study seismic response of pagoda. Use small magnitude gradual loading incentives pagoda model, pick up related data by the sensor, analyze data, get pagoda models relevant position in response to acceleration, displacement and structural parameters such as frequency changes. During the test, we used the rate of1000/sec high-speed camera, it could observe and record the location of structural damage occurs pagoda, size, timing and evolution.Fourth, contrasting and analyzing vibration test data, studying pagoda model nonlinear time history analysis. Under the same input ground motion in different situations peak acceleration, the dynamic response of the pagoda’s history analysis was carried out to calculate the elastic and elastic-plastic. We get the vibration response characteristics of the model under different conditions of intensity. Studying the material failure criterion of traditional brick masonry, optimize the explicit integration step, getting a detailed analysis of methods of operation and technical the parameters. It is an explicit dynamic finite element analysis program. By entering ground motion, the software simulating pagoda damage in the earthquake evolution and present failure process through animation. This paper gets an important way to summarize the failure mechanism for further study of the evolution and timing during the destruction of pagoda.Experimental study on vibration table brick model of reduced scale. Dynamic response and failure behavior under earthquake brick structures were economical and useful discussion. However, the limitations of small shaking table, computer hardware and software leading to nonlinear seismic response of brick on the quantitative relationship between the model structure and the structure of the prototype pagoda, characterization and description of the various types of damage pagoda dynamic analysis model need further exploration and research.