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**Source: **STP24237S

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An empirically based load-displacement model for typical silicone structural glazing joints is presented. The model is capable of simulating behavior under combined tensile and transverse shear loadings up to failure. Load and displacement are related by exponential equations of the form, *F* = *A*(1 - exp{-*B*Δ}). In this equation, *F* is the applied force (either tensile or shear). *A* and *B* are functions of tensile and shear displacements. The pairs of functions for tensile force and shear force are different. Δ is the resultant of tensile and shear displacements. The forms and constants for the functions *A* and *B* were obtained by regression analyses of test data at six different combinations of tensile and shear displacement, from pure tension to pure shear. An exponential equation with constants for *A* and *B* was fit to the data for each displacement combination. The constants were plotted versus a measure of relative tensile and shear displacements. Curves fit to these plots define the approximate expressions for *A* and *B* under any set of tensile and shear displacements below the failure limit. Comparisons of the model with the experimental data are shown. A simplified approach to obtaining the load-displacement model is also proposed and compared to experimental data. The application of the model to analysis of joint behavior in structural glazing systems is briefly discussed.

**Keywords:**

silicone, sealants, structural glazing, joints, stiffness, strength, modeling

**Author Information:**

Sandberg, LB *Professor, Michigan Technological University, Houghton, MI*

Tan, IP *Structural Engineer, AKB Engineers, Bellevue, WA*

**Committee/Subcommittee:** C24.35

**DOI:** 10.1520/STP24237S