טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
M.Sc Thesis
M.Sc StudentPinto Erez
SubjectTile-Wall System in Precast Walls-Stress Analysis and
Failure Criteria
DepartmentDepartment of Civil and Environmental Engineering
Supervisor Professor Emeritus Yeoshua Frostig


Abstract

The thesis presents the structural behavior of tile-wall systems made of a precast wall cladded by tiles with emphasize on the stresses involved and failure criteria. Cladding of precast walls with tiles is a well known efficient technique in the building industry that yields esthetic and long lasting appearance facades. In recent years, failure of  such wall-tile systems through detachments of tiles from a wall have been observed. As far as the author is aware of no analysis has been conducted to verify the capacity of such systems. Therefore, a comprehensive stress analysis and a definition of reliable failure criteria is essential in order to achieve a reasonable yet reliable design of precast wall-tile systems.

In the first part of the thesis, mathematical models of three typical methods for constructing such walls are presented. The mathematical models consist of the elastic foundation concept, the high-order approach and 3D finite elements models. The failure criterion adopted here is that of allowable stress.

A numerical study for the three models under typical loads as well as a parametric study is presented.

In the second part an energy approach is presented to define the interfacial spring coefficients as well as the properties for the high-order model method and a failure criterion of Energy Release Rate(ERR). The study reveals that the ERR failure criterion is more appropriate for such wall-tile systems than the concept of allowable stress. In the sequel conclusions and recommendations are presented.

Finally, this research enhances the understanding of structural behavior as well as their failure mechanism of precast wall-tile systems and establishes the basis for a reliable and reasonable design procedure.