Study On Destroyed Mechanism And Prevention Methods Of Xiangfei Tomb Grazed Brick

Xiangfei tomb is one of the biggest Islamic mausoleum buildings in Xinjiang, which set the size, the level of the mosque, the level of the mosque and taught by the Church, the tomb as a whole. Xiangfei tomb was founded in the mid-seventeenth century and was a national key cultural relic protection unit. The whole building outer wall veneer with green glazed brick, and has strong local national characteristics an important position in the history of Chinese architecture. Most glazed tiles in north of Xiangfei tomb dome fall off, especially bellow of about1/2dome roof semicircle part glazed tiles fall off very serious. Glazed tiles on the main tomb of Xiangfei tomb dome structure is different from the general building wall tiles, as the glass tiles is great, the bonding material is not added any admixture of pure gypsum, special structure and other factors resulted glazed tiles off, Therefore developed the new gypsum composite gypsum bonding material has an important significance to prevent the glazed brick fall off, historic preservation. The author, on the basis of simulating the failure mechanism of the glazed brick, through the laboratory experiments developed a composite admixture gypsum bonding material with a high bonding strength, good performance of flexible deformation. The main research contents of this thesis and the research results obtained by:(1) Using the finite element programming-ANSYS to simulate the brick wall, gypsum binder, glazed brick, educed the temperature field regularities distribution and the temperature-stress, shear stress, displacement produced by the variation of temperature.In the case of high temperature, high difference of temperature and lower temperature, the stress of gypsum layer, gypsum layer and the bonding interface is largest, and it is the worst position.(2) The stress of gypsum layer, gypsum layer and the bonding interface increase with the increase of the elastic modulus of the gypsum, thus increasing the flexible deformation properties, reducing the elastic modulus of the gypsum binder is one of the effective measures to reduce the temperature stress.(3) Through laboratory experiments obtained that the composite admixture gypsum can effectively extend the setting time and facilitate the site construction. The higher bond strength can ensure the quality of the bond. Because of low water absorption, it has better water resistance.It is more important that better flexible deformation capacity can greatly reduce temperature stress and deformation caused by temperature and its change, so as to prevent the shedding of glazed brick.(4) Through on-site glazed brick tensile bond strength experiments, verified the ratio of compound admixtures gypsum binder materials of this article chose tensile bond strength is highest, for optimal matching. Thin paste technology and thick paste technology, which combines the construction process is superior to the traditional thick paste construction technology.