The Study On Friction Factor And In Plane Energy Dissipation Of Interlocking Dry Stack Bricks

Because of the flexible structure layout, efficient space utilization, the infilled walls frame structures was wildly used, which can be find in commercial buildings, residential and office buildings. Since 1980 s, some scholars have studied the structure of the new type of dry masonry wall, the main advantages of dry-stacked masonry wall compared with traditional wall are friction energy dissipation, embedded masonry etc. The friction behavior between dry-stacked masonry have important influence on the energy dissipation characteristics of dry masonry structure. So far, the researchers all over the world have just studied the static friction characteristics of the plane bricks and have no quantitative analysis. Meanwhile, the friction model of the whole process of dry block is less, it is necessary to study the characteristics of the dynamic friction of dry block. At the same time, the distribution of friction coefficient of dry block is not considered in the numerical simulation of dry block. The friction characteristics of different built-in shapes are investigated by theoretical analysis, experimental research and numerical simulation. The main contents are as following:Three groups of different sizes, four groups of different compressive stress and 36 weeks cyclic pseudo static loading test. The main factors that influence the friction characteristics of dry block were carried out and the experimental results are processed according were studied. The friction characteristics of four different kinds of block type dry block under the influence factors are compared and analyzed, with the increase of compressive stress, the friction coefficient of dry block increases gradually, the degree of friction coefficient is firstly decreased and then increased; the friction coefficient increases with the increase of size, but the effect is less than that of compressive stress; the friction coefficient of dry block is decreased gradually, and the attenuation degree of different solid block is different.On the basis of the above experiments, the dynamic friction characteristics of dry block under eight different speeds were carried out by cyclic loading test. According to the experimental data, the typical friction hysteresis curve of dry block is obtained, and the hysteretic curve is simplified based on the key points, and the friction characteristics of each stage are analyzed. Different models, main parameters and their physical meanings are proposed for different stages of friction characteristics and the main parameters of the model were fitted according to the experimental data; The friction coefficient of a large number of dry block was tested, and the distribution types of friction coefficient were determined. The corresponding model is proposed according to the type of distribution, and the corresponding distribution parameters are determined according to the experimental data.Based on the theoretical analysis, the numerical simulation model of the dry block filled wall with probability distribution is modeled; the basic strategy of modeling, unit selection, joint analysis and so on are identified; the friction coefficient of a large number of the corresponding probability distributions are generated by MATLAB. Based on Monte Carlo method, a large number of cyclic loading simulations are carried out to analyze the stress distribution, deformation displacement and hysteresis curve between the filled wall with constant friction coefficient and probability distribution, and two different forms of the filling wall friction hysteresis curve area for a detailed comparison to determine the energy dissipation characteristics.