Experimental Study On Seismic Performance Of Tibetan Irregular Stone Wall Based On Image Analysis Method

The origin of traditional stone masonry buildings in Tibetan area dates back to 4000 years ago.It was first discovered in the archaeological excavation of the site of the Han Dynasty in the middle part of Danba county.It is still the most important type of residential housing used by Tibetans.The team made a field investigation in Tibet District of Sichuan,in-depth study of the current situation and distribution of Tibetan traditional farmhouses.A series of studies on the basic mechanical properties of the Tibetan irregular stone wall are carried out.According to the Tibetan irregular stone wall,low cyclic loading test research will be carried out 3 full-scale rubble wall,and then draw the Tibetan stone wall of a series of irregular seismic performance characteristics.The relationship between the shape parameters of irregular blocks and the seismic response characteristics of walls is established by image processing method and grey relational theory.The influence of geometric indicators on seismic performance of irregular masonry walls is explored.The main research results are as follows:1)Tibetan irregular features rubble block shape parameter correlation of stone wall seismic damageThrough the digital image technology in the rubble wall stones shape feature parameters were obtained;Based on the characteristic shape parameters of the material and the characteristics of the masonry process,the low cycle repeated test of the Tibetan irregular stone wall is carried out.Based on grey relation theory,to study the relationship between the irregular stone block the shape parameters and basic mechanical properties,we found that the impact factor of the block size in the ultimate bearing capacity under repeated horizontal load is greater than that of the impact factor of the block size.2)quantifying the geometric index of the Tibetan irregular stone wall blockAccording to the shape correlation degree of the aseismic behavior of the obtained irregular stone block and the stone wall body,the proposed value of the influence factors of each shape parameter of the block of the Tibetan irregular stone block composite stone wall is in accordance with the result of the test value.Preliminary identified more credible quantitative Tibetan irregular block composite stone wall geometrical index method,provide the basis for the further establishment of a comprehensive evaluation on the basic mechanical properties of stone block composite wall Tibetan irregular.