Stiffness Model Development of Roof-to-Wall Connections for Use in a Finite Element Model
Authors:Nicholas Andriano, David Roueche
Mentor:David Prevatt, Associate Professor of Civil Engineering, University of Florida
Customized U-bracket connections were developed in order to incorporate load cells to monitor reactions at roof-to-wall connections during high wind events. This study is to determine the stiffness of these connections along with standard connections (hurricane straps) used in residential structures to estimate load sharing differences in a full-scale model house. To investigate this, an Instron was used to place a tensile stress on models containing either the custom U-bracket connection or two diagonally placed hurricane straps. Load and displacement for each test was measured by the Instron, as five consecutive cycles were applied to each model in order to view fatigue effects. Force and displacement were measured in order to quantify the stiffness for each connection in each test, which will be used in a Finite Element Model to estimate load sharing in a house. The stiffness of a custom U-bracket connection was found to be much greater than that of a single hurricane strap for loads ranging from 0.1 to 0.2 kips.