You are here: Home / Products / Preliminary Study on a Simplified Response Spectrum Method for Incoherent Ground Motions of Bridges
<< Return to the Knowledge Center Landing Page

Preliminary Study on a Simplified Response Spectrum Method for Incoherent Ground Motions of Bridges

Preliminary Study on a Simplified Response Spectrum Method for Incoherent Ground Motions of Bridges, Greg Griffin.

The objectives of this study were 1) to provide insight into bridge response due to incoherency from the site-response effect, and 2) to provide the groundwork for a practical response spectrum method that can account for nonsynchronous ground motions using a simplified method. Griffin developed a two degree-of-freedom (DOF) computer model to simulate bridge response to incoherent ground motions. Ground motion at the supports was provided by a single DOF, nonlinear response history model. Three different earthquakes were selected and free-field ground motions were determined using the nonlinear ground response model for various soil deposit depths. Results indicate that incoherent ground motions can be expected to increase force levels or ductility demands. Dynamic effects appeared to contribute to rapid changes in the magnification factors. The results also indicated that, in certain period ranges, uniform base motion would predict maximum column ductility demands and incoherent ground motion response could be ignored. Griffin concludes with recommendations for future research that would contribute to implementing his study in bridge design practice. His research was conducted with the guidance of Professor M. Saiid Saiidi of the University of Nevada, Reno.

Quantity

EERI Members receive a 15% discount at checkout

Price: $0.00

Loading Updating cart...